7a43ab6fb2
The codepath to support the experimental split-index mode had remaining "racily clean" issues fixed. * sg/split-index-racefix: split-index: BUG() when cache entry refers to non-existing shared entry split-index: smudge and add racily clean cache entries to split index split-index: don't compare cached data of entries already marked for split index split-index: count the number of deleted entries t1700-split-index: date back files to avoid racy situations split-index: add tests to demonstrate the racy split index problem t1700-split-index: document why FSMONITOR is disabled in this test script
3546 lines
95 KiB
C
3546 lines
95 KiB
C
/*
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* GIT - The information manager from hell
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*
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* Copyright (C) Linus Torvalds, 2005
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*/
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#define NO_THE_INDEX_COMPATIBILITY_MACROS
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#include "cache.h"
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#include "config.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "tempfile.h"
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#include "lockfile.h"
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#include "cache-tree.h"
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#include "refs.h"
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#include "dir.h"
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#include "object-store.h"
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#include "tree.h"
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#include "commit.h"
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#include "blob.h"
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#include "resolve-undo.h"
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#include "strbuf.h"
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#include "varint.h"
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#include "split-index.h"
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#include "utf8.h"
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#include "fsmonitor.h"
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#include "thread-utils.h"
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#include "progress.h"
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/* Mask for the name length in ce_flags in the on-disk index */
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#define CE_NAMEMASK (0x0fff)
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/* Index extensions.
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*
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* The first letter should be 'A'..'Z' for extensions that are not
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* necessary for a correct operation (i.e. optimization data).
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* When new extensions are added that _needs_ to be understood in
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* order to correctly interpret the index file, pick character that
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* is outside the range, to cause the reader to abort.
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*/
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#define CACHE_EXT(s) ( (s[0]<<24)|(s[1]<<16)|(s[2]<<8)|(s[3]) )
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#define CACHE_EXT_TREE 0x54524545 /* "TREE" */
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#define CACHE_EXT_RESOLVE_UNDO 0x52455543 /* "REUC" */
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#define CACHE_EXT_LINK 0x6c696e6b /* "link" */
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#define CACHE_EXT_UNTRACKED 0x554E5452 /* "UNTR" */
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#define CACHE_EXT_FSMONITOR 0x46534D4E /* "FSMN" */
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#define CACHE_EXT_ENDOFINDEXENTRIES 0x454F4945 /* "EOIE" */
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#define CACHE_EXT_INDEXENTRYOFFSETTABLE 0x49454F54 /* "IEOT" */
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/* changes that can be kept in $GIT_DIR/index (basically all extensions) */
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#define EXTMASK (RESOLVE_UNDO_CHANGED | CACHE_TREE_CHANGED | \
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CE_ENTRY_ADDED | CE_ENTRY_REMOVED | CE_ENTRY_CHANGED | \
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SPLIT_INDEX_ORDERED | UNTRACKED_CHANGED | FSMONITOR_CHANGED)
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/*
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* This is an estimate of the pathname length in the index. We use
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* this for V4 index files to guess the un-deltafied size of the index
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* in memory because of pathname deltafication. This is not required
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* for V2/V3 index formats because their pathnames are not compressed.
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* If the initial amount of memory set aside is not sufficient, the
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* mem pool will allocate extra memory.
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*/
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#define CACHE_ENTRY_PATH_LENGTH 80
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static inline struct cache_entry *mem_pool__ce_alloc(struct mem_pool *mem_pool, size_t len)
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{
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struct cache_entry *ce;
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ce = mem_pool_alloc(mem_pool, cache_entry_size(len));
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ce->mem_pool_allocated = 1;
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return ce;
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}
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static inline struct cache_entry *mem_pool__ce_calloc(struct mem_pool *mem_pool, size_t len)
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{
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struct cache_entry * ce;
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ce = mem_pool_calloc(mem_pool, 1, cache_entry_size(len));
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ce->mem_pool_allocated = 1;
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return ce;
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}
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static struct mem_pool *find_mem_pool(struct index_state *istate)
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{
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struct mem_pool **pool_ptr;
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if (istate->split_index && istate->split_index->base)
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pool_ptr = &istate->split_index->base->ce_mem_pool;
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else
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pool_ptr = &istate->ce_mem_pool;
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if (!*pool_ptr)
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mem_pool_init(pool_ptr, 0);
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return *pool_ptr;
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}
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struct index_state the_index;
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static const char *alternate_index_output;
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static void set_index_entry(struct index_state *istate, int nr, struct cache_entry *ce)
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{
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istate->cache[nr] = ce;
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add_name_hash(istate, ce);
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}
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static void replace_index_entry(struct index_state *istate, int nr, struct cache_entry *ce)
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{
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struct cache_entry *old = istate->cache[nr];
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replace_index_entry_in_base(istate, old, ce);
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remove_name_hash(istate, old);
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discard_cache_entry(old);
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ce->ce_flags &= ~CE_HASHED;
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set_index_entry(istate, nr, ce);
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ce->ce_flags |= CE_UPDATE_IN_BASE;
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mark_fsmonitor_invalid(istate, ce);
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istate->cache_changed |= CE_ENTRY_CHANGED;
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}
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void rename_index_entry_at(struct index_state *istate, int nr, const char *new_name)
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{
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struct cache_entry *old_entry = istate->cache[nr], *new_entry;
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int namelen = strlen(new_name);
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new_entry = make_empty_cache_entry(istate, namelen);
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copy_cache_entry(new_entry, old_entry);
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new_entry->ce_flags &= ~CE_HASHED;
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new_entry->ce_namelen = namelen;
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new_entry->index = 0;
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memcpy(new_entry->name, new_name, namelen + 1);
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cache_tree_invalidate_path(istate, old_entry->name);
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untracked_cache_remove_from_index(istate, old_entry->name);
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remove_index_entry_at(istate, nr);
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add_index_entry(istate, new_entry, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE);
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}
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void fill_stat_data(struct stat_data *sd, struct stat *st)
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{
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sd->sd_ctime.sec = (unsigned int)st->st_ctime;
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sd->sd_mtime.sec = (unsigned int)st->st_mtime;
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sd->sd_ctime.nsec = ST_CTIME_NSEC(*st);
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sd->sd_mtime.nsec = ST_MTIME_NSEC(*st);
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sd->sd_dev = st->st_dev;
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sd->sd_ino = st->st_ino;
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sd->sd_uid = st->st_uid;
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sd->sd_gid = st->st_gid;
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sd->sd_size = st->st_size;
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}
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int match_stat_data(const struct stat_data *sd, struct stat *st)
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{
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int changed = 0;
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if (sd->sd_mtime.sec != (unsigned int)st->st_mtime)
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changed |= MTIME_CHANGED;
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if (trust_ctime && check_stat &&
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sd->sd_ctime.sec != (unsigned int)st->st_ctime)
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changed |= CTIME_CHANGED;
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#ifdef USE_NSEC
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if (check_stat && sd->sd_mtime.nsec != ST_MTIME_NSEC(*st))
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changed |= MTIME_CHANGED;
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if (trust_ctime && check_stat &&
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sd->sd_ctime.nsec != ST_CTIME_NSEC(*st))
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changed |= CTIME_CHANGED;
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#endif
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if (check_stat) {
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if (sd->sd_uid != (unsigned int) st->st_uid ||
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sd->sd_gid != (unsigned int) st->st_gid)
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changed |= OWNER_CHANGED;
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if (sd->sd_ino != (unsigned int) st->st_ino)
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changed |= INODE_CHANGED;
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}
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#ifdef USE_STDEV
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/*
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* st_dev breaks on network filesystems where different
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* clients will have different views of what "device"
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* the filesystem is on
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*/
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if (check_stat && sd->sd_dev != (unsigned int) st->st_dev)
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changed |= INODE_CHANGED;
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#endif
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if (sd->sd_size != (unsigned int) st->st_size)
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changed |= DATA_CHANGED;
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return changed;
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}
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/*
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* This only updates the "non-critical" parts of the directory
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* cache, ie the parts that aren't tracked by GIT, and only used
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* to validate the cache.
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*/
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void fill_stat_cache_info(struct cache_entry *ce, struct stat *st)
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{
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fill_stat_data(&ce->ce_stat_data, st);
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if (assume_unchanged)
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ce->ce_flags |= CE_VALID;
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if (S_ISREG(st->st_mode)) {
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ce_mark_uptodate(ce);
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mark_fsmonitor_valid(ce);
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}
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}
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static int ce_compare_data(struct index_state *istate,
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const struct cache_entry *ce,
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struct stat *st)
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{
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int match = -1;
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int fd = git_open_cloexec(ce->name, O_RDONLY);
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if (fd >= 0) {
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struct object_id oid;
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if (!index_fd(istate, &oid, fd, st, OBJ_BLOB, ce->name, 0))
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match = !oideq(&oid, &ce->oid);
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/* index_fd() closed the file descriptor already */
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}
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return match;
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}
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static int ce_compare_link(const struct cache_entry *ce, size_t expected_size)
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{
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int match = -1;
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void *buffer;
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unsigned long size;
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enum object_type type;
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struct strbuf sb = STRBUF_INIT;
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if (strbuf_readlink(&sb, ce->name, expected_size))
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return -1;
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buffer = read_object_file(&ce->oid, &type, &size);
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if (buffer) {
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if (size == sb.len)
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match = memcmp(buffer, sb.buf, size);
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free(buffer);
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}
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strbuf_release(&sb);
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return match;
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}
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static int ce_compare_gitlink(const struct cache_entry *ce)
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{
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struct object_id oid;
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/*
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* We don't actually require that the .git directory
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* under GITLINK directory be a valid git directory. It
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* might even be missing (in case nobody populated that
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* sub-project).
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*
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* If so, we consider it always to match.
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*/
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if (resolve_gitlink_ref(ce->name, "HEAD", &oid) < 0)
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return 0;
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return !oideq(&oid, &ce->oid);
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}
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static int ce_modified_check_fs(struct index_state *istate,
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const struct cache_entry *ce,
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struct stat *st)
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{
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switch (st->st_mode & S_IFMT) {
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case S_IFREG:
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if (ce_compare_data(istate, ce, st))
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return DATA_CHANGED;
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break;
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case S_IFLNK:
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if (ce_compare_link(ce, xsize_t(st->st_size)))
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return DATA_CHANGED;
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break;
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case S_IFDIR:
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if (S_ISGITLINK(ce->ce_mode))
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return ce_compare_gitlink(ce) ? DATA_CHANGED : 0;
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/* else fallthrough */
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default:
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return TYPE_CHANGED;
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}
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return 0;
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}
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static int ce_match_stat_basic(const struct cache_entry *ce, struct stat *st)
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{
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unsigned int changed = 0;
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if (ce->ce_flags & CE_REMOVE)
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return MODE_CHANGED | DATA_CHANGED | TYPE_CHANGED;
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switch (ce->ce_mode & S_IFMT) {
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case S_IFREG:
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changed |= !S_ISREG(st->st_mode) ? TYPE_CHANGED : 0;
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/* We consider only the owner x bit to be relevant for
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* "mode changes"
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*/
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if (trust_executable_bit &&
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(0100 & (ce->ce_mode ^ st->st_mode)))
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changed |= MODE_CHANGED;
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break;
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case S_IFLNK:
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if (!S_ISLNK(st->st_mode) &&
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(has_symlinks || !S_ISREG(st->st_mode)))
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changed |= TYPE_CHANGED;
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break;
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case S_IFGITLINK:
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/* We ignore most of the st_xxx fields for gitlinks */
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if (!S_ISDIR(st->st_mode))
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changed |= TYPE_CHANGED;
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else if (ce_compare_gitlink(ce))
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changed |= DATA_CHANGED;
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return changed;
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default:
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die("internal error: ce_mode is %o", ce->ce_mode);
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}
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changed |= match_stat_data(&ce->ce_stat_data, st);
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/* Racily smudged entry? */
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if (!ce->ce_stat_data.sd_size) {
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if (!is_empty_blob_sha1(ce->oid.hash))
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changed |= DATA_CHANGED;
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}
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return changed;
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}
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static int is_racy_stat(const struct index_state *istate,
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const struct stat_data *sd)
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{
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return (istate->timestamp.sec &&
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#ifdef USE_NSEC
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/* nanosecond timestamped files can also be racy! */
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(istate->timestamp.sec < sd->sd_mtime.sec ||
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(istate->timestamp.sec == sd->sd_mtime.sec &&
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istate->timestamp.nsec <= sd->sd_mtime.nsec))
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#else
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istate->timestamp.sec <= sd->sd_mtime.sec
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#endif
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);
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}
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int is_racy_timestamp(const struct index_state *istate,
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const struct cache_entry *ce)
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{
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return (!S_ISGITLINK(ce->ce_mode) &&
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is_racy_stat(istate, &ce->ce_stat_data));
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}
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int match_stat_data_racy(const struct index_state *istate,
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const struct stat_data *sd, struct stat *st)
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{
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if (is_racy_stat(istate, sd))
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return MTIME_CHANGED;
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return match_stat_data(sd, st);
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}
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int ie_match_stat(struct index_state *istate,
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const struct cache_entry *ce, struct stat *st,
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unsigned int options)
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{
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unsigned int changed;
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int ignore_valid = options & CE_MATCH_IGNORE_VALID;
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int ignore_skip_worktree = options & CE_MATCH_IGNORE_SKIP_WORKTREE;
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int assume_racy_is_modified = options & CE_MATCH_RACY_IS_DIRTY;
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int ignore_fsmonitor = options & CE_MATCH_IGNORE_FSMONITOR;
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if (!ignore_fsmonitor)
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refresh_fsmonitor(istate);
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/*
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* If it's marked as always valid in the index, it's
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* valid whatever the checked-out copy says.
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*
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* skip-worktree has the same effect with higher precedence
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*/
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if (!ignore_skip_worktree && ce_skip_worktree(ce))
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return 0;
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if (!ignore_valid && (ce->ce_flags & CE_VALID))
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return 0;
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if (!ignore_fsmonitor && (ce->ce_flags & CE_FSMONITOR_VALID))
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return 0;
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/*
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* Intent-to-add entries have not been added, so the index entry
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* by definition never matches what is in the work tree until it
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* actually gets added.
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*/
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if (ce_intent_to_add(ce))
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return DATA_CHANGED | TYPE_CHANGED | MODE_CHANGED;
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changed = ce_match_stat_basic(ce, st);
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/*
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* Within 1 second of this sequence:
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* echo xyzzy >file && git-update-index --add file
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* running this command:
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* echo frotz >file
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* would give a falsely clean cache entry. The mtime and
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* length match the cache, and other stat fields do not change.
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*
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* We could detect this at update-index time (the cache entry
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* being registered/updated records the same time as "now")
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* and delay the return from git-update-index, but that would
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* effectively mean we can make at most one commit per second,
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* which is not acceptable. Instead, we check cache entries
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* whose mtime are the same as the index file timestamp more
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* carefully than others.
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*/
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if (!changed && is_racy_timestamp(istate, ce)) {
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if (assume_racy_is_modified)
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changed |= DATA_CHANGED;
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else
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changed |= ce_modified_check_fs(istate, ce, st);
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}
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return changed;
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}
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int ie_modified(struct index_state *istate,
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const struct cache_entry *ce,
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struct stat *st, unsigned int options)
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{
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int changed, changed_fs;
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changed = ie_match_stat(istate, ce, st, options);
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if (!changed)
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return 0;
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/*
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* If the mode or type has changed, there's no point in trying
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* to refresh the entry - it's not going to match
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*/
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if (changed & (MODE_CHANGED | TYPE_CHANGED))
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return changed;
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|
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/*
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* Immediately after read-tree or update-index --cacheinfo,
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* the length field is zero, as we have never even read the
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* lstat(2) information once, and we cannot trust DATA_CHANGED
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* returned by ie_match_stat() which in turn was returned by
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* ce_match_stat_basic() to signal that the filesize of the
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* blob changed. We have to actually go to the filesystem to
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* see if the contents match, and if so, should answer "unchanged".
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*
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* The logic does not apply to gitlinks, as ce_match_stat_basic()
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* already has checked the actual HEAD from the filesystem in the
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* subproject. If ie_match_stat() already said it is different,
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* then we know it is.
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*/
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if ((changed & DATA_CHANGED) &&
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(S_ISGITLINK(ce->ce_mode) || ce->ce_stat_data.sd_size != 0))
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return changed;
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changed_fs = ce_modified_check_fs(istate, ce, st);
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if (changed_fs)
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return changed | changed_fs;
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return 0;
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}
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|
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int base_name_compare(const char *name1, int len1, int mode1,
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const char *name2, int len2, int mode2)
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|
{
|
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unsigned char c1, c2;
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int len = len1 < len2 ? len1 : len2;
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int cmp;
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cmp = memcmp(name1, name2, len);
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if (cmp)
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return cmp;
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c1 = name1[len];
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c2 = name2[len];
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if (!c1 && S_ISDIR(mode1))
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c1 = '/';
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if (!c2 && S_ISDIR(mode2))
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c2 = '/';
|
|
return (c1 < c2) ? -1 : (c1 > c2) ? 1 : 0;
|
|
}
|
|
|
|
/*
|
|
* df_name_compare() is identical to base_name_compare(), except it
|
|
* compares conflicting directory/file entries as equal. Note that
|
|
* while a directory name compares as equal to a regular file, they
|
|
* then individually compare _differently_ to a filename that has
|
|
* a dot after the basename (because '\0' < '.' < '/').
|
|
*
|
|
* This is used by routines that want to traverse the git namespace
|
|
* but then handle conflicting entries together when possible.
|
|
*/
|
|
int df_name_compare(const char *name1, int len1, int mode1,
|
|
const char *name2, int len2, int mode2)
|
|
{
|
|
int len = len1 < len2 ? len1 : len2, cmp;
|
|
unsigned char c1, c2;
|
|
|
|
cmp = memcmp(name1, name2, len);
|
|
if (cmp)
|
|
return cmp;
|
|
/* Directories and files compare equal (same length, same name) */
|
|
if (len1 == len2)
|
|
return 0;
|
|
c1 = name1[len];
|
|
if (!c1 && S_ISDIR(mode1))
|
|
c1 = '/';
|
|
c2 = name2[len];
|
|
if (!c2 && S_ISDIR(mode2))
|
|
c2 = '/';
|
|
if (c1 == '/' && !c2)
|
|
return 0;
|
|
if (c2 == '/' && !c1)
|
|
return 0;
|
|
return c1 - c2;
|
|
}
|
|
|
|
int name_compare(const char *name1, size_t len1, const char *name2, size_t len2)
|
|
{
|
|
size_t min_len = (len1 < len2) ? len1 : len2;
|
|
int cmp = memcmp(name1, name2, min_len);
|
|
if (cmp)
|
|
return cmp;
|
|
if (len1 < len2)
|
|
return -1;
|
|
if (len1 > len2)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
int cache_name_stage_compare(const char *name1, int len1, int stage1, const char *name2, int len2, int stage2)
|
|
{
|
|
int cmp;
|
|
|
|
cmp = name_compare(name1, len1, name2, len2);
|
|
if (cmp)
|
|
return cmp;
|
|
|
|
if (stage1 < stage2)
|
|
return -1;
|
|
if (stage1 > stage2)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int index_name_stage_pos(const struct index_state *istate, const char *name, int namelen, int stage)
|
|
{
|
|
int first, last;
|
|
|
|
first = 0;
|
|
last = istate->cache_nr;
|
|
while (last > first) {
|
|
int next = (last + first) >> 1;
|
|
struct cache_entry *ce = istate->cache[next];
|
|
int cmp = cache_name_stage_compare(name, namelen, stage, ce->name, ce_namelen(ce), ce_stage(ce));
|
|
if (!cmp)
|
|
return next;
|
|
if (cmp < 0) {
|
|
last = next;
|
|
continue;
|
|
}
|
|
first = next+1;
|
|
}
|
|
return -first-1;
|
|
}
|
|
|
|
int index_name_pos(const struct index_state *istate, const char *name, int namelen)
|
|
{
|
|
return index_name_stage_pos(istate, name, namelen, 0);
|
|
}
|
|
|
|
int remove_index_entry_at(struct index_state *istate, int pos)
|
|
{
|
|
struct cache_entry *ce = istate->cache[pos];
|
|
|
|
record_resolve_undo(istate, ce);
|
|
remove_name_hash(istate, ce);
|
|
save_or_free_index_entry(istate, ce);
|
|
istate->cache_changed |= CE_ENTRY_REMOVED;
|
|
istate->cache_nr--;
|
|
if (pos >= istate->cache_nr)
|
|
return 0;
|
|
MOVE_ARRAY(istate->cache + pos, istate->cache + pos + 1,
|
|
istate->cache_nr - pos);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Remove all cache entries marked for removal, that is where
|
|
* CE_REMOVE is set in ce_flags. This is much more effective than
|
|
* calling remove_index_entry_at() for each entry to be removed.
|
|
*/
|
|
void remove_marked_cache_entries(struct index_state *istate)
|
|
{
|
|
struct cache_entry **ce_array = istate->cache;
|
|
unsigned int i, j;
|
|
|
|
for (i = j = 0; i < istate->cache_nr; i++) {
|
|
if (ce_array[i]->ce_flags & CE_REMOVE) {
|
|
remove_name_hash(istate, ce_array[i]);
|
|
save_or_free_index_entry(istate, ce_array[i]);
|
|
}
|
|
else
|
|
ce_array[j++] = ce_array[i];
|
|
}
|
|
if (j == istate->cache_nr)
|
|
return;
|
|
istate->cache_changed |= CE_ENTRY_REMOVED;
|
|
istate->cache_nr = j;
|
|
}
|
|
|
|
int remove_file_from_index(struct index_state *istate, const char *path)
|
|
{
|
|
int pos = index_name_pos(istate, path, strlen(path));
|
|
if (pos < 0)
|
|
pos = -pos-1;
|
|
cache_tree_invalidate_path(istate, path);
|
|
untracked_cache_remove_from_index(istate, path);
|
|
while (pos < istate->cache_nr && !strcmp(istate->cache[pos]->name, path))
|
|
remove_index_entry_at(istate, pos);
|
|
return 0;
|
|
}
|
|
|
|
static int compare_name(struct cache_entry *ce, const char *path, int namelen)
|
|
{
|
|
return namelen != ce_namelen(ce) || memcmp(path, ce->name, namelen);
|
|
}
|
|
|
|
static int index_name_pos_also_unmerged(struct index_state *istate,
|
|
const char *path, int namelen)
|
|
{
|
|
int pos = index_name_pos(istate, path, namelen);
|
|
struct cache_entry *ce;
|
|
|
|
if (pos >= 0)
|
|
return pos;
|
|
|
|
/* maybe unmerged? */
|
|
pos = -1 - pos;
|
|
if (pos >= istate->cache_nr ||
|
|
compare_name((ce = istate->cache[pos]), path, namelen))
|
|
return -1;
|
|
|
|
/* order of preference: stage 2, 1, 3 */
|
|
if (ce_stage(ce) == 1 && pos + 1 < istate->cache_nr &&
|
|
ce_stage((ce = istate->cache[pos + 1])) == 2 &&
|
|
!compare_name(ce, path, namelen))
|
|
pos++;
|
|
return pos;
|
|
}
|
|
|
|
static int different_name(struct cache_entry *ce, struct cache_entry *alias)
|
|
{
|
|
int len = ce_namelen(ce);
|
|
return ce_namelen(alias) != len || memcmp(ce->name, alias->name, len);
|
|
}
|
|
|
|
/*
|
|
* If we add a filename that aliases in the cache, we will use the
|
|
* name that we already have - but we don't want to update the same
|
|
* alias twice, because that implies that there were actually two
|
|
* different files with aliasing names!
|
|
*
|
|
* So we use the CE_ADDED flag to verify that the alias was an old
|
|
* one before we accept it as
|
|
*/
|
|
static struct cache_entry *create_alias_ce(struct index_state *istate,
|
|
struct cache_entry *ce,
|
|
struct cache_entry *alias)
|
|
{
|
|
int len;
|
|
struct cache_entry *new_entry;
|
|
|
|
if (alias->ce_flags & CE_ADDED)
|
|
die("Will not add file alias '%s' ('%s' already exists in index)", ce->name, alias->name);
|
|
|
|
/* Ok, create the new entry using the name of the existing alias */
|
|
len = ce_namelen(alias);
|
|
new_entry = make_empty_cache_entry(istate, len);
|
|
memcpy(new_entry->name, alias->name, len);
|
|
copy_cache_entry(new_entry, ce);
|
|
save_or_free_index_entry(istate, ce);
|
|
return new_entry;
|
|
}
|
|
|
|
void set_object_name_for_intent_to_add_entry(struct cache_entry *ce)
|
|
{
|
|
struct object_id oid;
|
|
if (write_object_file("", 0, blob_type, &oid))
|
|
die("cannot create an empty blob in the object database");
|
|
oidcpy(&ce->oid, &oid);
|
|
}
|
|
|
|
int add_to_index(struct index_state *istate, const char *path, struct stat *st, int flags)
|
|
{
|
|
int namelen, was_same;
|
|
mode_t st_mode = st->st_mode;
|
|
struct cache_entry *ce, *alias = NULL;
|
|
unsigned ce_option = CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE|CE_MATCH_RACY_IS_DIRTY;
|
|
int verbose = flags & (ADD_CACHE_VERBOSE | ADD_CACHE_PRETEND);
|
|
int pretend = flags & ADD_CACHE_PRETEND;
|
|
int intent_only = flags & ADD_CACHE_INTENT;
|
|
int add_option = (ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE|
|
|
(intent_only ? ADD_CACHE_NEW_ONLY : 0));
|
|
int newflags = HASH_WRITE_OBJECT;
|
|
|
|
if (flags & HASH_RENORMALIZE)
|
|
newflags |= HASH_RENORMALIZE;
|
|
|
|
if (!S_ISREG(st_mode) && !S_ISLNK(st_mode) && !S_ISDIR(st_mode))
|
|
return error("%s: can only add regular files, symbolic links or git-directories", path);
|
|
|
|
namelen = strlen(path);
|
|
if (S_ISDIR(st_mode)) {
|
|
while (namelen && path[namelen-1] == '/')
|
|
namelen--;
|
|
}
|
|
ce = make_empty_cache_entry(istate, namelen);
|
|
memcpy(ce->name, path, namelen);
|
|
ce->ce_namelen = namelen;
|
|
if (!intent_only)
|
|
fill_stat_cache_info(ce, st);
|
|
else
|
|
ce->ce_flags |= CE_INTENT_TO_ADD;
|
|
|
|
|
|
if (trust_executable_bit && has_symlinks) {
|
|
ce->ce_mode = create_ce_mode(st_mode);
|
|
} else {
|
|
/* If there is an existing entry, pick the mode bits and type
|
|
* from it, otherwise assume unexecutable regular file.
|
|
*/
|
|
struct cache_entry *ent;
|
|
int pos = index_name_pos_also_unmerged(istate, path, namelen);
|
|
|
|
ent = (0 <= pos) ? istate->cache[pos] : NULL;
|
|
ce->ce_mode = ce_mode_from_stat(ent, st_mode);
|
|
}
|
|
|
|
/* When core.ignorecase=true, determine if a directory of the same name but differing
|
|
* case already exists within the Git repository. If it does, ensure the directory
|
|
* case of the file being added to the repository matches (is folded into) the existing
|
|
* entry's directory case.
|
|
*/
|
|
if (ignore_case) {
|
|
adjust_dirname_case(istate, ce->name);
|
|
}
|
|
if (!(flags & HASH_RENORMALIZE)) {
|
|
alias = index_file_exists(istate, ce->name,
|
|
ce_namelen(ce), ignore_case);
|
|
if (alias &&
|
|
!ce_stage(alias) &&
|
|
!ie_match_stat(istate, alias, st, ce_option)) {
|
|
/* Nothing changed, really */
|
|
if (!S_ISGITLINK(alias->ce_mode))
|
|
ce_mark_uptodate(alias);
|
|
alias->ce_flags |= CE_ADDED;
|
|
|
|
discard_cache_entry(ce);
|
|
return 0;
|
|
}
|
|
}
|
|
if (!intent_only) {
|
|
if (index_path(istate, &ce->oid, path, st, newflags)) {
|
|
discard_cache_entry(ce);
|
|
return error("unable to index file %s", path);
|
|
}
|
|
} else
|
|
set_object_name_for_intent_to_add_entry(ce);
|
|
|
|
if (ignore_case && alias && different_name(ce, alias))
|
|
ce = create_alias_ce(istate, ce, alias);
|
|
ce->ce_flags |= CE_ADDED;
|
|
|
|
/* It was suspected to be racily clean, but it turns out to be Ok */
|
|
was_same = (alias &&
|
|
!ce_stage(alias) &&
|
|
oideq(&alias->oid, &ce->oid) &&
|
|
ce->ce_mode == alias->ce_mode);
|
|
|
|
if (pretend)
|
|
discard_cache_entry(ce);
|
|
else if (add_index_entry(istate, ce, add_option)) {
|
|
discard_cache_entry(ce);
|
|
return error("unable to add %s to index", path);
|
|
}
|
|
if (verbose && !was_same)
|
|
printf("add '%s'\n", path);
|
|
return 0;
|
|
}
|
|
|
|
int add_file_to_index(struct index_state *istate, const char *path, int flags)
|
|
{
|
|
struct stat st;
|
|
if (lstat(path, &st))
|
|
die_errno("unable to stat '%s'", path);
|
|
return add_to_index(istate, path, &st, flags);
|
|
}
|
|
|
|
struct cache_entry *make_empty_cache_entry(struct index_state *istate, size_t len)
|
|
{
|
|
return mem_pool__ce_calloc(find_mem_pool(istate), len);
|
|
}
|
|
|
|
struct cache_entry *make_empty_transient_cache_entry(size_t len)
|
|
{
|
|
return xcalloc(1, cache_entry_size(len));
|
|
}
|
|
|
|
struct cache_entry *make_cache_entry(struct index_state *istate,
|
|
unsigned int mode,
|
|
const struct object_id *oid,
|
|
const char *path,
|
|
int stage,
|
|
unsigned int refresh_options)
|
|
{
|
|
struct cache_entry *ce, *ret;
|
|
int len;
|
|
|
|
if (!verify_path(path, mode)) {
|
|
error("Invalid path '%s'", path);
|
|
return NULL;
|
|
}
|
|
|
|
len = strlen(path);
|
|
ce = make_empty_cache_entry(istate, len);
|
|
|
|
oidcpy(&ce->oid, oid);
|
|
memcpy(ce->name, path, len);
|
|
ce->ce_flags = create_ce_flags(stage);
|
|
ce->ce_namelen = len;
|
|
ce->ce_mode = create_ce_mode(mode);
|
|
|
|
ret = refresh_cache_entry(istate, ce, refresh_options);
|
|
if (ret != ce)
|
|
discard_cache_entry(ce);
|
|
return ret;
|
|
}
|
|
|
|
struct cache_entry *make_transient_cache_entry(unsigned int mode, const struct object_id *oid,
|
|
const char *path, int stage)
|
|
{
|
|
struct cache_entry *ce;
|
|
int len;
|
|
|
|
if (!verify_path(path, mode)) {
|
|
error("Invalid path '%s'", path);
|
|
return NULL;
|
|
}
|
|
|
|
len = strlen(path);
|
|
ce = make_empty_transient_cache_entry(len);
|
|
|
|
oidcpy(&ce->oid, oid);
|
|
memcpy(ce->name, path, len);
|
|
ce->ce_flags = create_ce_flags(stage);
|
|
ce->ce_namelen = len;
|
|
ce->ce_mode = create_ce_mode(mode);
|
|
|
|
return ce;
|
|
}
|
|
|
|
/*
|
|
* Chmod an index entry with either +x or -x.
|
|
*
|
|
* Returns -1 if the chmod for the particular cache entry failed (if it's
|
|
* not a regular file), -2 if an invalid flip argument is passed in, 0
|
|
* otherwise.
|
|
*/
|
|
int chmod_index_entry(struct index_state *istate, struct cache_entry *ce,
|
|
char flip)
|
|
{
|
|
if (!S_ISREG(ce->ce_mode))
|
|
return -1;
|
|
switch (flip) {
|
|
case '+':
|
|
ce->ce_mode |= 0111;
|
|
break;
|
|
case '-':
|
|
ce->ce_mode &= ~0111;
|
|
break;
|
|
default:
|
|
return -2;
|
|
}
|
|
cache_tree_invalidate_path(istate, ce->name);
|
|
ce->ce_flags |= CE_UPDATE_IN_BASE;
|
|
mark_fsmonitor_invalid(istate, ce);
|
|
istate->cache_changed |= CE_ENTRY_CHANGED;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ce_same_name(const struct cache_entry *a, const struct cache_entry *b)
|
|
{
|
|
int len = ce_namelen(a);
|
|
return ce_namelen(b) == len && !memcmp(a->name, b->name, len);
|
|
}
|
|
|
|
/*
|
|
* We fundamentally don't like some paths: we don't want
|
|
* dot or dot-dot anywhere, and for obvious reasons don't
|
|
* want to recurse into ".git" either.
|
|
*
|
|
* Also, we don't want double slashes or slashes at the
|
|
* end that can make pathnames ambiguous.
|
|
*/
|
|
static int verify_dotfile(const char *rest, unsigned mode)
|
|
{
|
|
/*
|
|
* The first character was '.', but that
|
|
* has already been discarded, we now test
|
|
* the rest.
|
|
*/
|
|
|
|
/* "." is not allowed */
|
|
if (*rest == '\0' || is_dir_sep(*rest))
|
|
return 0;
|
|
|
|
switch (*rest) {
|
|
/*
|
|
* ".git" followed by NUL or slash is bad. Note that we match
|
|
* case-insensitively here, even if ignore_case is not set.
|
|
* This outlaws ".GIT" everywhere out of an abundance of caution,
|
|
* since there's really no good reason to allow it.
|
|
*
|
|
* Once we've seen ".git", we can also find ".gitmodules", etc (also
|
|
* case-insensitively).
|
|
*/
|
|
case 'g':
|
|
case 'G':
|
|
if (rest[1] != 'i' && rest[1] != 'I')
|
|
break;
|
|
if (rest[2] != 't' && rest[2] != 'T')
|
|
break;
|
|
if (rest[3] == '\0' || is_dir_sep(rest[3]))
|
|
return 0;
|
|
if (S_ISLNK(mode)) {
|
|
rest += 3;
|
|
if (skip_iprefix(rest, "modules", &rest) &&
|
|
(*rest == '\0' || is_dir_sep(*rest)))
|
|
return 0;
|
|
}
|
|
break;
|
|
case '.':
|
|
if (rest[1] == '\0' || is_dir_sep(rest[1]))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
int verify_path(const char *path, unsigned mode)
|
|
{
|
|
char c;
|
|
|
|
if (has_dos_drive_prefix(path))
|
|
return 0;
|
|
|
|
goto inside;
|
|
for (;;) {
|
|
if (!c)
|
|
return 1;
|
|
if (is_dir_sep(c)) {
|
|
inside:
|
|
if (protect_hfs) {
|
|
if (is_hfs_dotgit(path))
|
|
return 0;
|
|
if (S_ISLNK(mode)) {
|
|
if (is_hfs_dotgitmodules(path))
|
|
return 0;
|
|
}
|
|
}
|
|
if (protect_ntfs) {
|
|
if (is_ntfs_dotgit(path))
|
|
return 0;
|
|
if (S_ISLNK(mode)) {
|
|
if (is_ntfs_dotgitmodules(path))
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
c = *path++;
|
|
if ((c == '.' && !verify_dotfile(path, mode)) ||
|
|
is_dir_sep(c) || c == '\0')
|
|
return 0;
|
|
}
|
|
c = *path++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Do we have another file that has the beginning components being a
|
|
* proper superset of the name we're trying to add?
|
|
*/
|
|
static int has_file_name(struct index_state *istate,
|
|
const struct cache_entry *ce, int pos, int ok_to_replace)
|
|
{
|
|
int retval = 0;
|
|
int len = ce_namelen(ce);
|
|
int stage = ce_stage(ce);
|
|
const char *name = ce->name;
|
|
|
|
while (pos < istate->cache_nr) {
|
|
struct cache_entry *p = istate->cache[pos++];
|
|
|
|
if (len >= ce_namelen(p))
|
|
break;
|
|
if (memcmp(name, p->name, len))
|
|
break;
|
|
if (ce_stage(p) != stage)
|
|
continue;
|
|
if (p->name[len] != '/')
|
|
continue;
|
|
if (p->ce_flags & CE_REMOVE)
|
|
continue;
|
|
retval = -1;
|
|
if (!ok_to_replace)
|
|
break;
|
|
remove_index_entry_at(istate, --pos);
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
|
|
/*
|
|
* Like strcmp(), but also return the offset of the first change.
|
|
* If strings are equal, return the length.
|
|
*/
|
|
int strcmp_offset(const char *s1, const char *s2, size_t *first_change)
|
|
{
|
|
size_t k;
|
|
|
|
if (!first_change)
|
|
return strcmp(s1, s2);
|
|
|
|
for (k = 0; s1[k] == s2[k]; k++)
|
|
if (s1[k] == '\0')
|
|
break;
|
|
|
|
*first_change = k;
|
|
return (unsigned char)s1[k] - (unsigned char)s2[k];
|
|
}
|
|
|
|
/*
|
|
* Do we have another file with a pathname that is a proper
|
|
* subset of the name we're trying to add?
|
|
*
|
|
* That is, is there another file in the index with a path
|
|
* that matches a sub-directory in the given entry?
|
|
*/
|
|
static int has_dir_name(struct index_state *istate,
|
|
const struct cache_entry *ce, int pos, int ok_to_replace)
|
|
{
|
|
int retval = 0;
|
|
int stage = ce_stage(ce);
|
|
const char *name = ce->name;
|
|
const char *slash = name + ce_namelen(ce);
|
|
size_t len_eq_last;
|
|
int cmp_last = 0;
|
|
|
|
/*
|
|
* We are frequently called during an iteration on a sorted
|
|
* list of pathnames and while building a new index. Therefore,
|
|
* there is a high probability that this entry will eventually
|
|
* be appended to the index, rather than inserted in the middle.
|
|
* If we can confirm that, we can avoid binary searches on the
|
|
* components of the pathname.
|
|
*
|
|
* Compare the entry's full path with the last path in the index.
|
|
*/
|
|
if (istate->cache_nr > 0) {
|
|
cmp_last = strcmp_offset(name,
|
|
istate->cache[istate->cache_nr - 1]->name,
|
|
&len_eq_last);
|
|
if (cmp_last > 0) {
|
|
if (len_eq_last == 0) {
|
|
/*
|
|
* The entry sorts AFTER the last one in the
|
|
* index and their paths have no common prefix,
|
|
* so there cannot be a F/D conflict.
|
|
*/
|
|
return retval;
|
|
} else {
|
|
/*
|
|
* The entry sorts AFTER the last one in the
|
|
* index, but has a common prefix. Fall through
|
|
* to the loop below to disect the entry's path
|
|
* and see where the difference is.
|
|
*/
|
|
}
|
|
} else if (cmp_last == 0) {
|
|
/*
|
|
* The entry exactly matches the last one in the
|
|
* index, but because of multiple stage and CE_REMOVE
|
|
* items, we fall through and let the regular search
|
|
* code handle it.
|
|
*/
|
|
}
|
|
}
|
|
|
|
for (;;) {
|
|
size_t len;
|
|
|
|
for (;;) {
|
|
if (*--slash == '/')
|
|
break;
|
|
if (slash <= ce->name)
|
|
return retval;
|
|
}
|
|
len = slash - name;
|
|
|
|
if (cmp_last > 0) {
|
|
/*
|
|
* (len + 1) is a directory boundary (including
|
|
* the trailing slash). And since the loop is
|
|
* decrementing "slash", the first iteration is
|
|
* the longest directory prefix; subsequent
|
|
* iterations consider parent directories.
|
|
*/
|
|
|
|
if (len + 1 <= len_eq_last) {
|
|
/*
|
|
* The directory prefix (including the trailing
|
|
* slash) also appears as a prefix in the last
|
|
* entry, so the remainder cannot collide (because
|
|
* strcmp said the whole path was greater).
|
|
*
|
|
* EQ: last: xxx/A
|
|
* this: xxx/B
|
|
*
|
|
* LT: last: xxx/file_A
|
|
* this: xxx/file_B
|
|
*/
|
|
return retval;
|
|
}
|
|
|
|
if (len > len_eq_last) {
|
|
/*
|
|
* This part of the directory prefix (excluding
|
|
* the trailing slash) is longer than the known
|
|
* equal portions, so this sub-directory cannot
|
|
* collide with a file.
|
|
*
|
|
* GT: last: xxxA
|
|
* this: xxxB/file
|
|
*/
|
|
return retval;
|
|
}
|
|
|
|
if (istate->cache_nr > 0 &&
|
|
ce_namelen(istate->cache[istate->cache_nr - 1]) > len) {
|
|
/*
|
|
* The directory prefix lines up with part of
|
|
* a longer file or directory name, but sorts
|
|
* after it, so this sub-directory cannot
|
|
* collide with a file.
|
|
*
|
|
* last: xxx/yy-file (because '-' sorts before '/')
|
|
* this: xxx/yy/abc
|
|
*/
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* This is a possible collision. Fall through and
|
|
* let the regular search code handle it.
|
|
*
|
|
* last: xxx
|
|
* this: xxx/file
|
|
*/
|
|
}
|
|
|
|
pos = index_name_stage_pos(istate, name, len, stage);
|
|
if (pos >= 0) {
|
|
/*
|
|
* Found one, but not so fast. This could
|
|
* be a marker that says "I was here, but
|
|
* I am being removed". Such an entry is
|
|
* not a part of the resulting tree, and
|
|
* it is Ok to have a directory at the same
|
|
* path.
|
|
*/
|
|
if (!(istate->cache[pos]->ce_flags & CE_REMOVE)) {
|
|
retval = -1;
|
|
if (!ok_to_replace)
|
|
break;
|
|
remove_index_entry_at(istate, pos);
|
|
continue;
|
|
}
|
|
}
|
|
else
|
|
pos = -pos-1;
|
|
|
|
/*
|
|
* Trivial optimization: if we find an entry that
|
|
* already matches the sub-directory, then we know
|
|
* we're ok, and we can exit.
|
|
*/
|
|
while (pos < istate->cache_nr) {
|
|
struct cache_entry *p = istate->cache[pos];
|
|
if ((ce_namelen(p) <= len) ||
|
|
(p->name[len] != '/') ||
|
|
memcmp(p->name, name, len))
|
|
break; /* not our subdirectory */
|
|
if (ce_stage(p) == stage && !(p->ce_flags & CE_REMOVE))
|
|
/*
|
|
* p is at the same stage as our entry, and
|
|
* is a subdirectory of what we are looking
|
|
* at, so we cannot have conflicts at our
|
|
* level or anything shorter.
|
|
*/
|
|
return retval;
|
|
pos++;
|
|
}
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
/* We may be in a situation where we already have path/file and path
|
|
* is being added, or we already have path and path/file is being
|
|
* added. Either one would result in a nonsense tree that has path
|
|
* twice when git-write-tree tries to write it out. Prevent it.
|
|
*
|
|
* If ok-to-replace is specified, we remove the conflicting entries
|
|
* from the cache so the caller should recompute the insert position.
|
|
* When this happens, we return non-zero.
|
|
*/
|
|
static int check_file_directory_conflict(struct index_state *istate,
|
|
const struct cache_entry *ce,
|
|
int pos, int ok_to_replace)
|
|
{
|
|
int retval;
|
|
|
|
/*
|
|
* When ce is an "I am going away" entry, we allow it to be added
|
|
*/
|
|
if (ce->ce_flags & CE_REMOVE)
|
|
return 0;
|
|
|
|
/*
|
|
* We check if the path is a sub-path of a subsequent pathname
|
|
* first, since removing those will not change the position
|
|
* in the array.
|
|
*/
|
|
retval = has_file_name(istate, ce, pos, ok_to_replace);
|
|
|
|
/*
|
|
* Then check if the path might have a clashing sub-directory
|
|
* before it.
|
|
*/
|
|
return retval + has_dir_name(istate, ce, pos, ok_to_replace);
|
|
}
|
|
|
|
static int add_index_entry_with_check(struct index_state *istate, struct cache_entry *ce, int option)
|
|
{
|
|
int pos;
|
|
int ok_to_add = option & ADD_CACHE_OK_TO_ADD;
|
|
int ok_to_replace = option & ADD_CACHE_OK_TO_REPLACE;
|
|
int skip_df_check = option & ADD_CACHE_SKIP_DFCHECK;
|
|
int new_only = option & ADD_CACHE_NEW_ONLY;
|
|
|
|
if (!(option & ADD_CACHE_KEEP_CACHE_TREE))
|
|
cache_tree_invalidate_path(istate, ce->name);
|
|
|
|
/*
|
|
* If this entry's path sorts after the last entry in the index,
|
|
* we can avoid searching for it.
|
|
*/
|
|
if (istate->cache_nr > 0 &&
|
|
strcmp(ce->name, istate->cache[istate->cache_nr - 1]->name) > 0)
|
|
pos = -istate->cache_nr - 1;
|
|
else
|
|
pos = index_name_stage_pos(istate, ce->name, ce_namelen(ce), ce_stage(ce));
|
|
|
|
/* existing match? Just replace it. */
|
|
if (pos >= 0) {
|
|
if (!new_only)
|
|
replace_index_entry(istate, pos, ce);
|
|
return 0;
|
|
}
|
|
pos = -pos-1;
|
|
|
|
if (!(option & ADD_CACHE_KEEP_CACHE_TREE))
|
|
untracked_cache_add_to_index(istate, ce->name);
|
|
|
|
/*
|
|
* Inserting a merged entry ("stage 0") into the index
|
|
* will always replace all non-merged entries..
|
|
*/
|
|
if (pos < istate->cache_nr && ce_stage(ce) == 0) {
|
|
while (ce_same_name(istate->cache[pos], ce)) {
|
|
ok_to_add = 1;
|
|
if (!remove_index_entry_at(istate, pos))
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!ok_to_add)
|
|
return -1;
|
|
if (!verify_path(ce->name, ce->ce_mode))
|
|
return error("Invalid path '%s'", ce->name);
|
|
|
|
if (!skip_df_check &&
|
|
check_file_directory_conflict(istate, ce, pos, ok_to_replace)) {
|
|
if (!ok_to_replace)
|
|
return error("'%s' appears as both a file and as a directory",
|
|
ce->name);
|
|
pos = index_name_stage_pos(istate, ce->name, ce_namelen(ce), ce_stage(ce));
|
|
pos = -pos-1;
|
|
}
|
|
return pos + 1;
|
|
}
|
|
|
|
int add_index_entry(struct index_state *istate, struct cache_entry *ce, int option)
|
|
{
|
|
int pos;
|
|
|
|
if (option & ADD_CACHE_JUST_APPEND)
|
|
pos = istate->cache_nr;
|
|
else {
|
|
int ret;
|
|
ret = add_index_entry_with_check(istate, ce, option);
|
|
if (ret <= 0)
|
|
return ret;
|
|
pos = ret - 1;
|
|
}
|
|
|
|
/* Make sure the array is big enough .. */
|
|
ALLOC_GROW(istate->cache, istate->cache_nr + 1, istate->cache_alloc);
|
|
|
|
/* Add it in.. */
|
|
istate->cache_nr++;
|
|
if (istate->cache_nr > pos + 1)
|
|
MOVE_ARRAY(istate->cache + pos + 1, istate->cache + pos,
|
|
istate->cache_nr - pos - 1);
|
|
set_index_entry(istate, pos, ce);
|
|
istate->cache_changed |= CE_ENTRY_ADDED;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* "refresh" does not calculate a new sha1 file or bring the
|
|
* cache up-to-date for mode/content changes. But what it
|
|
* _does_ do is to "re-match" the stat information of a file
|
|
* with the cache, so that you can refresh the cache for a
|
|
* file that hasn't been changed but where the stat entry is
|
|
* out of date.
|
|
*
|
|
* For example, you'd want to do this after doing a "git-read-tree",
|
|
* to link up the stat cache details with the proper files.
|
|
*/
|
|
static struct cache_entry *refresh_cache_ent(struct index_state *istate,
|
|
struct cache_entry *ce,
|
|
unsigned int options, int *err,
|
|
int *changed_ret)
|
|
{
|
|
struct stat st;
|
|
struct cache_entry *updated;
|
|
int changed;
|
|
int refresh = options & CE_MATCH_REFRESH;
|
|
int ignore_valid = options & CE_MATCH_IGNORE_VALID;
|
|
int ignore_skip_worktree = options & CE_MATCH_IGNORE_SKIP_WORKTREE;
|
|
int ignore_missing = options & CE_MATCH_IGNORE_MISSING;
|
|
int ignore_fsmonitor = options & CE_MATCH_IGNORE_FSMONITOR;
|
|
|
|
if (!refresh || ce_uptodate(ce))
|
|
return ce;
|
|
|
|
if (!ignore_fsmonitor)
|
|
refresh_fsmonitor(istate);
|
|
/*
|
|
* CE_VALID or CE_SKIP_WORKTREE means the user promised us
|
|
* that the change to the work tree does not matter and told
|
|
* us not to worry.
|
|
*/
|
|
if (!ignore_skip_worktree && ce_skip_worktree(ce)) {
|
|
ce_mark_uptodate(ce);
|
|
return ce;
|
|
}
|
|
if (!ignore_valid && (ce->ce_flags & CE_VALID)) {
|
|
ce_mark_uptodate(ce);
|
|
return ce;
|
|
}
|
|
if (!ignore_fsmonitor && (ce->ce_flags & CE_FSMONITOR_VALID)) {
|
|
ce_mark_uptodate(ce);
|
|
return ce;
|
|
}
|
|
|
|
if (has_symlink_leading_path(ce->name, ce_namelen(ce))) {
|
|
if (ignore_missing)
|
|
return ce;
|
|
if (err)
|
|
*err = ENOENT;
|
|
return NULL;
|
|
}
|
|
|
|
if (lstat(ce->name, &st) < 0) {
|
|
if (ignore_missing && errno == ENOENT)
|
|
return ce;
|
|
if (err)
|
|
*err = errno;
|
|
return NULL;
|
|
}
|
|
|
|
changed = ie_match_stat(istate, ce, &st, options);
|
|
if (changed_ret)
|
|
*changed_ret = changed;
|
|
if (!changed) {
|
|
/*
|
|
* The path is unchanged. If we were told to ignore
|
|
* valid bit, then we did the actual stat check and
|
|
* found that the entry is unmodified. If the entry
|
|
* is not marked VALID, this is the place to mark it
|
|
* valid again, under "assume unchanged" mode.
|
|
*/
|
|
if (ignore_valid && assume_unchanged &&
|
|
!(ce->ce_flags & CE_VALID))
|
|
; /* mark this one VALID again */
|
|
else {
|
|
/*
|
|
* We do not mark the index itself "modified"
|
|
* because CE_UPTODATE flag is in-core only;
|
|
* we are not going to write this change out.
|
|
*/
|
|
if (!S_ISGITLINK(ce->ce_mode)) {
|
|
ce_mark_uptodate(ce);
|
|
mark_fsmonitor_valid(ce);
|
|
}
|
|
return ce;
|
|
}
|
|
}
|
|
|
|
if (ie_modified(istate, ce, &st, options)) {
|
|
if (err)
|
|
*err = EINVAL;
|
|
return NULL;
|
|
}
|
|
|
|
updated = make_empty_cache_entry(istate, ce_namelen(ce));
|
|
copy_cache_entry(updated, ce);
|
|
memcpy(updated->name, ce->name, ce->ce_namelen + 1);
|
|
fill_stat_cache_info(updated, &st);
|
|
/*
|
|
* If ignore_valid is not set, we should leave CE_VALID bit
|
|
* alone. Otherwise, paths marked with --no-assume-unchanged
|
|
* (i.e. things to be edited) will reacquire CE_VALID bit
|
|
* automatically, which is not really what we want.
|
|
*/
|
|
if (!ignore_valid && assume_unchanged &&
|
|
!(ce->ce_flags & CE_VALID))
|
|
updated->ce_flags &= ~CE_VALID;
|
|
|
|
/* istate->cache_changed is updated in the caller */
|
|
return updated;
|
|
}
|
|
|
|
static void show_file(const char * fmt, const char * name, int in_porcelain,
|
|
int * first, const char *header_msg)
|
|
{
|
|
if (in_porcelain && *first && header_msg) {
|
|
printf("%s\n", header_msg);
|
|
*first = 0;
|
|
}
|
|
printf(fmt, name);
|
|
}
|
|
|
|
int refresh_index(struct index_state *istate, unsigned int flags,
|
|
const struct pathspec *pathspec,
|
|
char *seen, const char *header_msg)
|
|
{
|
|
int i;
|
|
int has_errors = 0;
|
|
int really = (flags & REFRESH_REALLY) != 0;
|
|
int allow_unmerged = (flags & REFRESH_UNMERGED) != 0;
|
|
int quiet = (flags & REFRESH_QUIET) != 0;
|
|
int not_new = (flags & REFRESH_IGNORE_MISSING) != 0;
|
|
int ignore_submodules = (flags & REFRESH_IGNORE_SUBMODULES) != 0;
|
|
int first = 1;
|
|
int in_porcelain = (flags & REFRESH_IN_PORCELAIN);
|
|
unsigned int options = (CE_MATCH_REFRESH |
|
|
(really ? CE_MATCH_IGNORE_VALID : 0) |
|
|
(not_new ? CE_MATCH_IGNORE_MISSING : 0));
|
|
const char *modified_fmt;
|
|
const char *deleted_fmt;
|
|
const char *typechange_fmt;
|
|
const char *added_fmt;
|
|
const char *unmerged_fmt;
|
|
struct progress *progress = NULL;
|
|
|
|
if (flags & REFRESH_PROGRESS && isatty(2))
|
|
progress = start_delayed_progress(_("Refresh index"),
|
|
istate->cache_nr);
|
|
|
|
trace_performance_enter();
|
|
modified_fmt = (in_porcelain ? "M\t%s\n" : "%s: needs update\n");
|
|
deleted_fmt = (in_porcelain ? "D\t%s\n" : "%s: needs update\n");
|
|
typechange_fmt = (in_porcelain ? "T\t%s\n" : "%s needs update\n");
|
|
added_fmt = (in_porcelain ? "A\t%s\n" : "%s needs update\n");
|
|
unmerged_fmt = (in_porcelain ? "U\t%s\n" : "%s: needs merge\n");
|
|
for (i = 0; i < istate->cache_nr; i++) {
|
|
struct cache_entry *ce, *new_entry;
|
|
int cache_errno = 0;
|
|
int changed = 0;
|
|
int filtered = 0;
|
|
|
|
ce = istate->cache[i];
|
|
if (ignore_submodules && S_ISGITLINK(ce->ce_mode))
|
|
continue;
|
|
|
|
if (pathspec && !ce_path_match(istate, ce, pathspec, seen))
|
|
filtered = 1;
|
|
|
|
if (ce_stage(ce)) {
|
|
while ((i < istate->cache_nr) &&
|
|
! strcmp(istate->cache[i]->name, ce->name))
|
|
i++;
|
|
i--;
|
|
if (allow_unmerged)
|
|
continue;
|
|
if (!filtered)
|
|
show_file(unmerged_fmt, ce->name, in_porcelain,
|
|
&first, header_msg);
|
|
has_errors = 1;
|
|
continue;
|
|
}
|
|
|
|
if (filtered)
|
|
continue;
|
|
|
|
new_entry = refresh_cache_ent(istate, ce, options, &cache_errno, &changed);
|
|
if (new_entry == ce)
|
|
continue;
|
|
if (progress)
|
|
display_progress(progress, i);
|
|
if (!new_entry) {
|
|
const char *fmt;
|
|
|
|
if (really && cache_errno == EINVAL) {
|
|
/* If we are doing --really-refresh that
|
|
* means the index is not valid anymore.
|
|
*/
|
|
ce->ce_flags &= ~CE_VALID;
|
|
ce->ce_flags |= CE_UPDATE_IN_BASE;
|
|
mark_fsmonitor_invalid(istate, ce);
|
|
istate->cache_changed |= CE_ENTRY_CHANGED;
|
|
}
|
|
if (quiet)
|
|
continue;
|
|
|
|
if (cache_errno == ENOENT)
|
|
fmt = deleted_fmt;
|
|
else if (ce_intent_to_add(ce))
|
|
fmt = added_fmt; /* must be before other checks */
|
|
else if (changed & TYPE_CHANGED)
|
|
fmt = typechange_fmt;
|
|
else
|
|
fmt = modified_fmt;
|
|
show_file(fmt,
|
|
ce->name, in_porcelain, &first, header_msg);
|
|
has_errors = 1;
|
|
continue;
|
|
}
|
|
|
|
replace_index_entry(istate, i, new_entry);
|
|
}
|
|
if (progress) {
|
|
display_progress(progress, istate->cache_nr);
|
|
stop_progress(&progress);
|
|
}
|
|
trace_performance_leave("refresh index");
|
|
return has_errors;
|
|
}
|
|
|
|
struct cache_entry *refresh_cache_entry(struct index_state *istate,
|
|
struct cache_entry *ce,
|
|
unsigned int options)
|
|
{
|
|
return refresh_cache_ent(istate, ce, options, NULL, NULL);
|
|
}
|
|
|
|
|
|
/*****************************************************************
|
|
* Index File I/O
|
|
*****************************************************************/
|
|
|
|
#define INDEX_FORMAT_DEFAULT 3
|
|
|
|
static unsigned int get_index_format_default(void)
|
|
{
|
|
char *envversion = getenv("GIT_INDEX_VERSION");
|
|
char *endp;
|
|
int value;
|
|
unsigned int version = INDEX_FORMAT_DEFAULT;
|
|
|
|
if (!envversion) {
|
|
if (!git_config_get_int("index.version", &value))
|
|
version = value;
|
|
if (version < INDEX_FORMAT_LB || INDEX_FORMAT_UB < version) {
|
|
warning(_("index.version set, but the value is invalid.\n"
|
|
"Using version %i"), INDEX_FORMAT_DEFAULT);
|
|
return INDEX_FORMAT_DEFAULT;
|
|
}
|
|
return version;
|
|
}
|
|
|
|
version = strtoul(envversion, &endp, 10);
|
|
if (*endp ||
|
|
version < INDEX_FORMAT_LB || INDEX_FORMAT_UB < version) {
|
|
warning(_("GIT_INDEX_VERSION set, but the value is invalid.\n"
|
|
"Using version %i"), INDEX_FORMAT_DEFAULT);
|
|
version = INDEX_FORMAT_DEFAULT;
|
|
}
|
|
return version;
|
|
}
|
|
|
|
/*
|
|
* dev/ino/uid/gid/size are also just tracked to the low 32 bits
|
|
* Again - this is just a (very strong in practice) heuristic that
|
|
* the inode hasn't changed.
|
|
*
|
|
* We save the fields in big-endian order to allow using the
|
|
* index file over NFS transparently.
|
|
*/
|
|
struct ondisk_cache_entry {
|
|
struct cache_time ctime;
|
|
struct cache_time mtime;
|
|
uint32_t dev;
|
|
uint32_t ino;
|
|
uint32_t mode;
|
|
uint32_t uid;
|
|
uint32_t gid;
|
|
uint32_t size;
|
|
unsigned char sha1[20];
|
|
uint16_t flags;
|
|
char name[FLEX_ARRAY]; /* more */
|
|
};
|
|
|
|
/*
|
|
* This struct is used when CE_EXTENDED bit is 1
|
|
* The struct must match ondisk_cache_entry exactly from
|
|
* ctime till flags
|
|
*/
|
|
struct ondisk_cache_entry_extended {
|
|
struct cache_time ctime;
|
|
struct cache_time mtime;
|
|
uint32_t dev;
|
|
uint32_t ino;
|
|
uint32_t mode;
|
|
uint32_t uid;
|
|
uint32_t gid;
|
|
uint32_t size;
|
|
unsigned char sha1[20];
|
|
uint16_t flags;
|
|
uint16_t flags2;
|
|
char name[FLEX_ARRAY]; /* more */
|
|
};
|
|
|
|
/* These are only used for v3 or lower */
|
|
#define align_padding_size(size, len) ((size + (len) + 8) & ~7) - (size + len)
|
|
#define align_flex_name(STRUCT,len) ((offsetof(struct STRUCT,name) + (len) + 8) & ~7)
|
|
#define ondisk_cache_entry_size(len) align_flex_name(ondisk_cache_entry,len)
|
|
#define ondisk_cache_entry_extended_size(len) align_flex_name(ondisk_cache_entry_extended,len)
|
|
#define ondisk_ce_size(ce) (((ce)->ce_flags & CE_EXTENDED) ? \
|
|
ondisk_cache_entry_extended_size(ce_namelen(ce)) : \
|
|
ondisk_cache_entry_size(ce_namelen(ce)))
|
|
|
|
/* Allow fsck to force verification of the index checksum. */
|
|
int verify_index_checksum;
|
|
|
|
/* Allow fsck to force verification of the cache entry order. */
|
|
int verify_ce_order;
|
|
|
|
static int verify_hdr(const struct cache_header *hdr, unsigned long size)
|
|
{
|
|
git_hash_ctx c;
|
|
unsigned char hash[GIT_MAX_RAWSZ];
|
|
int hdr_version;
|
|
|
|
if (hdr->hdr_signature != htonl(CACHE_SIGNATURE))
|
|
return error("bad signature");
|
|
hdr_version = ntohl(hdr->hdr_version);
|
|
if (hdr_version < INDEX_FORMAT_LB || INDEX_FORMAT_UB < hdr_version)
|
|
return error("bad index version %d", hdr_version);
|
|
|
|
if (!verify_index_checksum)
|
|
return 0;
|
|
|
|
the_hash_algo->init_fn(&c);
|
|
the_hash_algo->update_fn(&c, hdr, size - the_hash_algo->rawsz);
|
|
the_hash_algo->final_fn(hash, &c);
|
|
if (!hasheq(hash, (unsigned char *)hdr + size - the_hash_algo->rawsz))
|
|
return error("bad index file sha1 signature");
|
|
return 0;
|
|
}
|
|
|
|
static int read_index_extension(struct index_state *istate,
|
|
const char *ext, const char *data, unsigned long sz)
|
|
{
|
|
switch (CACHE_EXT(ext)) {
|
|
case CACHE_EXT_TREE:
|
|
istate->cache_tree = cache_tree_read(data, sz);
|
|
break;
|
|
case CACHE_EXT_RESOLVE_UNDO:
|
|
istate->resolve_undo = resolve_undo_read(data, sz);
|
|
break;
|
|
case CACHE_EXT_LINK:
|
|
if (read_link_extension(istate, data, sz))
|
|
return -1;
|
|
break;
|
|
case CACHE_EXT_UNTRACKED:
|
|
istate->untracked = read_untracked_extension(data, sz);
|
|
break;
|
|
case CACHE_EXT_FSMONITOR:
|
|
read_fsmonitor_extension(istate, data, sz);
|
|
break;
|
|
case CACHE_EXT_ENDOFINDEXENTRIES:
|
|
case CACHE_EXT_INDEXENTRYOFFSETTABLE:
|
|
/* already handled in do_read_index() */
|
|
break;
|
|
default:
|
|
if (*ext < 'A' || 'Z' < *ext)
|
|
return error("index uses %.4s extension, which we do not understand",
|
|
ext);
|
|
fprintf(stderr, "ignoring %.4s extension\n", ext);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int hold_locked_index(struct lock_file *lk, int lock_flags)
|
|
{
|
|
return hold_lock_file_for_update(lk, get_index_file(), lock_flags);
|
|
}
|
|
|
|
int read_index(struct index_state *istate)
|
|
{
|
|
return read_index_from(istate, get_index_file(), get_git_dir());
|
|
}
|
|
|
|
static struct cache_entry *create_from_disk(struct mem_pool *ce_mem_pool,
|
|
unsigned int version,
|
|
struct ondisk_cache_entry *ondisk,
|
|
unsigned long *ent_size,
|
|
const struct cache_entry *previous_ce)
|
|
{
|
|
struct cache_entry *ce;
|
|
size_t len;
|
|
const char *name;
|
|
unsigned int flags;
|
|
size_t copy_len;
|
|
/*
|
|
* Adjacent cache entries tend to share the leading paths, so it makes
|
|
* sense to only store the differences in later entries. In the v4
|
|
* on-disk format of the index, each on-disk cache entry stores the
|
|
* number of bytes to be stripped from the end of the previous name,
|
|
* and the bytes to append to the result, to come up with its name.
|
|
*/
|
|
int expand_name_field = version == 4;
|
|
|
|
/* On-disk flags are just 16 bits */
|
|
flags = get_be16(&ondisk->flags);
|
|
len = flags & CE_NAMEMASK;
|
|
|
|
if (flags & CE_EXTENDED) {
|
|
struct ondisk_cache_entry_extended *ondisk2;
|
|
int extended_flags;
|
|
ondisk2 = (struct ondisk_cache_entry_extended *)ondisk;
|
|
extended_flags = get_be16(&ondisk2->flags2) << 16;
|
|
/* We do not yet understand any bit out of CE_EXTENDED_FLAGS */
|
|
if (extended_flags & ~CE_EXTENDED_FLAGS)
|
|
die("Unknown index entry format %08x", extended_flags);
|
|
flags |= extended_flags;
|
|
name = ondisk2->name;
|
|
}
|
|
else
|
|
name = ondisk->name;
|
|
|
|
if (expand_name_field) {
|
|
const unsigned char *cp = (const unsigned char *)name;
|
|
size_t strip_len, previous_len;
|
|
|
|
/* If we're at the begining of a block, ignore the previous name */
|
|
strip_len = decode_varint(&cp);
|
|
if (previous_ce) {
|
|
previous_len = previous_ce->ce_namelen;
|
|
if (previous_len < strip_len)
|
|
die(_("malformed name field in the index, near path '%s'"),
|
|
previous_ce->name);
|
|
copy_len = previous_len - strip_len;
|
|
} else {
|
|
copy_len = 0;
|
|
}
|
|
name = (const char *)cp;
|
|
}
|
|
|
|
if (len == CE_NAMEMASK) {
|
|
len = strlen(name);
|
|
if (expand_name_field)
|
|
len += copy_len;
|
|
}
|
|
|
|
ce = mem_pool__ce_alloc(ce_mem_pool, len);
|
|
|
|
ce->ce_stat_data.sd_ctime.sec = get_be32(&ondisk->ctime.sec);
|
|
ce->ce_stat_data.sd_mtime.sec = get_be32(&ondisk->mtime.sec);
|
|
ce->ce_stat_data.sd_ctime.nsec = get_be32(&ondisk->ctime.nsec);
|
|
ce->ce_stat_data.sd_mtime.nsec = get_be32(&ondisk->mtime.nsec);
|
|
ce->ce_stat_data.sd_dev = get_be32(&ondisk->dev);
|
|
ce->ce_stat_data.sd_ino = get_be32(&ondisk->ino);
|
|
ce->ce_mode = get_be32(&ondisk->mode);
|
|
ce->ce_stat_data.sd_uid = get_be32(&ondisk->uid);
|
|
ce->ce_stat_data.sd_gid = get_be32(&ondisk->gid);
|
|
ce->ce_stat_data.sd_size = get_be32(&ondisk->size);
|
|
ce->ce_flags = flags & ~CE_NAMEMASK;
|
|
ce->ce_namelen = len;
|
|
ce->index = 0;
|
|
hashcpy(ce->oid.hash, ondisk->sha1);
|
|
|
|
if (expand_name_field) {
|
|
if (copy_len)
|
|
memcpy(ce->name, previous_ce->name, copy_len);
|
|
memcpy(ce->name + copy_len, name, len + 1 - copy_len);
|
|
*ent_size = (name - ((char *)ondisk)) + len + 1 - copy_len;
|
|
} else {
|
|
memcpy(ce->name, name, len + 1);
|
|
*ent_size = ondisk_ce_size(ce);
|
|
}
|
|
return ce;
|
|
}
|
|
|
|
static void check_ce_order(struct index_state *istate)
|
|
{
|
|
unsigned int i;
|
|
|
|
if (!verify_ce_order)
|
|
return;
|
|
|
|
for (i = 1; i < istate->cache_nr; i++) {
|
|
struct cache_entry *ce = istate->cache[i - 1];
|
|
struct cache_entry *next_ce = istate->cache[i];
|
|
int name_compare = strcmp(ce->name, next_ce->name);
|
|
|
|
if (0 < name_compare)
|
|
die("unordered stage entries in index");
|
|
if (!name_compare) {
|
|
if (!ce_stage(ce))
|
|
die("multiple stage entries for merged file '%s'",
|
|
ce->name);
|
|
if (ce_stage(ce) > ce_stage(next_ce))
|
|
die("unordered stage entries for '%s'",
|
|
ce->name);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void tweak_untracked_cache(struct index_state *istate)
|
|
{
|
|
switch (git_config_get_untracked_cache()) {
|
|
case -1: /* keep: do nothing */
|
|
break;
|
|
case 0: /* false */
|
|
remove_untracked_cache(istate);
|
|
break;
|
|
case 1: /* true */
|
|
add_untracked_cache(istate);
|
|
break;
|
|
default: /* unknown value: do nothing */
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void tweak_split_index(struct index_state *istate)
|
|
{
|
|
switch (git_config_get_split_index()) {
|
|
case -1: /* unset: do nothing */
|
|
break;
|
|
case 0: /* false */
|
|
remove_split_index(istate);
|
|
break;
|
|
case 1: /* true */
|
|
add_split_index(istate);
|
|
break;
|
|
default: /* unknown value: do nothing */
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void post_read_index_from(struct index_state *istate)
|
|
{
|
|
check_ce_order(istate);
|
|
tweak_untracked_cache(istate);
|
|
tweak_split_index(istate);
|
|
tweak_fsmonitor(istate);
|
|
}
|
|
|
|
static size_t estimate_cache_size_from_compressed(unsigned int entries)
|
|
{
|
|
return entries * (sizeof(struct cache_entry) + CACHE_ENTRY_PATH_LENGTH);
|
|
}
|
|
|
|
static size_t estimate_cache_size(size_t ondisk_size, unsigned int entries)
|
|
{
|
|
long per_entry = sizeof(struct cache_entry) - sizeof(struct ondisk_cache_entry);
|
|
|
|
/*
|
|
* Account for potential alignment differences.
|
|
*/
|
|
per_entry += align_padding_size(sizeof(struct cache_entry), -sizeof(struct ondisk_cache_entry));
|
|
return ondisk_size + entries * per_entry;
|
|
}
|
|
|
|
struct index_entry_offset
|
|
{
|
|
/* starting byte offset into index file, count of index entries in this block */
|
|
int offset, nr;
|
|
};
|
|
|
|
struct index_entry_offset_table
|
|
{
|
|
int nr;
|
|
struct index_entry_offset entries[FLEX_ARRAY];
|
|
};
|
|
|
|
#ifndef NO_PTHREADS
|
|
static struct index_entry_offset_table *read_ieot_extension(const char *mmap, size_t mmap_size, size_t offset);
|
|
static void write_ieot_extension(struct strbuf *sb, struct index_entry_offset_table *ieot);
|
|
#endif
|
|
|
|
static size_t read_eoie_extension(const char *mmap, size_t mmap_size);
|
|
static void write_eoie_extension(struct strbuf *sb, git_hash_ctx *eoie_context, size_t offset);
|
|
|
|
struct load_index_extensions
|
|
{
|
|
#ifndef NO_PTHREADS
|
|
pthread_t pthread;
|
|
#endif
|
|
struct index_state *istate;
|
|
const char *mmap;
|
|
size_t mmap_size;
|
|
unsigned long src_offset;
|
|
};
|
|
|
|
static void *load_index_extensions(void *_data)
|
|
{
|
|
struct load_index_extensions *p = _data;
|
|
unsigned long src_offset = p->src_offset;
|
|
|
|
while (src_offset <= p->mmap_size - the_hash_algo->rawsz - 8) {
|
|
/* After an array of active_nr index entries,
|
|
* there can be arbitrary number of extended
|
|
* sections, each of which is prefixed with
|
|
* extension name (4-byte) and section length
|
|
* in 4-byte network byte order.
|
|
*/
|
|
uint32_t extsize = get_be32(p->mmap + src_offset + 4);
|
|
if (read_index_extension(p->istate,
|
|
p->mmap + src_offset,
|
|
p->mmap + src_offset + 8,
|
|
extsize) < 0) {
|
|
munmap((void *)p->mmap, p->mmap_size);
|
|
die(_("index file corrupt"));
|
|
}
|
|
src_offset += 8;
|
|
src_offset += extsize;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* A helper function that will load the specified range of cache entries
|
|
* from the memory mapped file and add them to the given index.
|
|
*/
|
|
static unsigned long load_cache_entry_block(struct index_state *istate,
|
|
struct mem_pool *ce_mem_pool, int offset, int nr, const char *mmap,
|
|
unsigned long start_offset, const struct cache_entry *previous_ce)
|
|
{
|
|
int i;
|
|
unsigned long src_offset = start_offset;
|
|
|
|
for (i = offset; i < offset + nr; i++) {
|
|
struct ondisk_cache_entry *disk_ce;
|
|
struct cache_entry *ce;
|
|
unsigned long consumed;
|
|
|
|
disk_ce = (struct ondisk_cache_entry *)(mmap + src_offset);
|
|
ce = create_from_disk(ce_mem_pool, istate->version, disk_ce, &consumed, previous_ce);
|
|
set_index_entry(istate, i, ce);
|
|
|
|
src_offset += consumed;
|
|
previous_ce = ce;
|
|
}
|
|
return src_offset - start_offset;
|
|
}
|
|
|
|
static unsigned long load_all_cache_entries(struct index_state *istate,
|
|
const char *mmap, size_t mmap_size, unsigned long src_offset)
|
|
{
|
|
unsigned long consumed;
|
|
|
|
if (istate->version == 4) {
|
|
mem_pool_init(&istate->ce_mem_pool,
|
|
estimate_cache_size_from_compressed(istate->cache_nr));
|
|
} else {
|
|
mem_pool_init(&istate->ce_mem_pool,
|
|
estimate_cache_size(mmap_size, istate->cache_nr));
|
|
}
|
|
|
|
consumed = load_cache_entry_block(istate, istate->ce_mem_pool,
|
|
0, istate->cache_nr, mmap, src_offset, NULL);
|
|
return consumed;
|
|
}
|
|
|
|
#ifndef NO_PTHREADS
|
|
|
|
/*
|
|
* Mostly randomly chosen maximum thread counts: we
|
|
* cap the parallelism to online_cpus() threads, and we want
|
|
* to have at least 10000 cache entries per thread for it to
|
|
* be worth starting a thread.
|
|
*/
|
|
|
|
#define THREAD_COST (10000)
|
|
|
|
struct load_cache_entries_thread_data
|
|
{
|
|
pthread_t pthread;
|
|
struct index_state *istate;
|
|
struct mem_pool *ce_mem_pool;
|
|
int offset;
|
|
const char *mmap;
|
|
struct index_entry_offset_table *ieot;
|
|
int ieot_start; /* starting index into the ieot array */
|
|
int ieot_blocks; /* count of ieot entries to process */
|
|
unsigned long consumed; /* return # of bytes in index file processed */
|
|
};
|
|
|
|
/*
|
|
* A thread proc to run the load_cache_entries() computation
|
|
* across multiple background threads.
|
|
*/
|
|
static void *load_cache_entries_thread(void *_data)
|
|
{
|
|
struct load_cache_entries_thread_data *p = _data;
|
|
int i;
|
|
|
|
/* iterate across all ieot blocks assigned to this thread */
|
|
for (i = p->ieot_start; i < p->ieot_start + p->ieot_blocks; i++) {
|
|
p->consumed += load_cache_entry_block(p->istate, p->ce_mem_pool,
|
|
p->offset, p->ieot->entries[i].nr, p->mmap, p->ieot->entries[i].offset, NULL);
|
|
p->offset += p->ieot->entries[i].nr;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static unsigned long load_cache_entries_threaded(struct index_state *istate, const char *mmap, size_t mmap_size,
|
|
unsigned long src_offset, int nr_threads, struct index_entry_offset_table *ieot)
|
|
{
|
|
int i, offset, ieot_blocks, ieot_start, err;
|
|
struct load_cache_entries_thread_data *data;
|
|
unsigned long consumed = 0;
|
|
|
|
/* a little sanity checking */
|
|
if (istate->name_hash_initialized)
|
|
BUG("the name hash isn't thread safe");
|
|
|
|
mem_pool_init(&istate->ce_mem_pool, 0);
|
|
|
|
/* ensure we have no more threads than we have blocks to process */
|
|
if (nr_threads > ieot->nr)
|
|
nr_threads = ieot->nr;
|
|
data = xcalloc(nr_threads, sizeof(*data));
|
|
|
|
offset = ieot_start = 0;
|
|
ieot_blocks = DIV_ROUND_UP(ieot->nr, nr_threads);
|
|
for (i = 0; i < nr_threads; i++) {
|
|
struct load_cache_entries_thread_data *p = &data[i];
|
|
int nr, j;
|
|
|
|
if (ieot_start + ieot_blocks > ieot->nr)
|
|
ieot_blocks = ieot->nr - ieot_start;
|
|
|
|
p->istate = istate;
|
|
p->offset = offset;
|
|
p->mmap = mmap;
|
|
p->ieot = ieot;
|
|
p->ieot_start = ieot_start;
|
|
p->ieot_blocks = ieot_blocks;
|
|
|
|
/* create a mem_pool for each thread */
|
|
nr = 0;
|
|
for (j = p->ieot_start; j < p->ieot_start + p->ieot_blocks; j++)
|
|
nr += p->ieot->entries[j].nr;
|
|
if (istate->version == 4) {
|
|
mem_pool_init(&p->ce_mem_pool,
|
|
estimate_cache_size_from_compressed(nr));
|
|
} else {
|
|
mem_pool_init(&p->ce_mem_pool,
|
|
estimate_cache_size(mmap_size, nr));
|
|
}
|
|
|
|
err = pthread_create(&p->pthread, NULL, load_cache_entries_thread, p);
|
|
if (err)
|
|
die(_("unable to create load_cache_entries thread: %s"), strerror(err));
|
|
|
|
/* increment by the number of cache entries in the ieot block being processed */
|
|
for (j = 0; j < ieot_blocks; j++)
|
|
offset += ieot->entries[ieot_start + j].nr;
|
|
ieot_start += ieot_blocks;
|
|
}
|
|
|
|
for (i = 0; i < nr_threads; i++) {
|
|
struct load_cache_entries_thread_data *p = &data[i];
|
|
|
|
err = pthread_join(p->pthread, NULL);
|
|
if (err)
|
|
die(_("unable to join load_cache_entries thread: %s"), strerror(err));
|
|
mem_pool_combine(istate->ce_mem_pool, p->ce_mem_pool);
|
|
consumed += p->consumed;
|
|
}
|
|
|
|
free(data);
|
|
|
|
return consumed;
|
|
}
|
|
#endif
|
|
|
|
/* remember to discard_cache() before reading a different cache! */
|
|
int do_read_index(struct index_state *istate, const char *path, int must_exist)
|
|
{
|
|
int fd;
|
|
struct stat st;
|
|
unsigned long src_offset;
|
|
const struct cache_header *hdr;
|
|
const char *mmap;
|
|
size_t mmap_size;
|
|
struct load_index_extensions p;
|
|
size_t extension_offset = 0;
|
|
#ifndef NO_PTHREADS
|
|
int nr_threads, cpus;
|
|
struct index_entry_offset_table *ieot = NULL;
|
|
#endif
|
|
|
|
if (istate->initialized)
|
|
return istate->cache_nr;
|
|
|
|
istate->timestamp.sec = 0;
|
|
istate->timestamp.nsec = 0;
|
|
fd = open(path, O_RDONLY);
|
|
if (fd < 0) {
|
|
if (!must_exist && errno == ENOENT)
|
|
return 0;
|
|
die_errno("%s: index file open failed", path);
|
|
}
|
|
|
|
if (fstat(fd, &st))
|
|
die_errno("cannot stat the open index");
|
|
|
|
mmap_size = xsize_t(st.st_size);
|
|
if (mmap_size < sizeof(struct cache_header) + the_hash_algo->rawsz)
|
|
die("index file smaller than expected");
|
|
|
|
mmap = xmmap(NULL, mmap_size, PROT_READ, MAP_PRIVATE, fd, 0);
|
|
if (mmap == MAP_FAILED)
|
|
die_errno("unable to map index file");
|
|
close(fd);
|
|
|
|
hdr = (const struct cache_header *)mmap;
|
|
if (verify_hdr(hdr, mmap_size) < 0)
|
|
goto unmap;
|
|
|
|
hashcpy(istate->oid.hash, (const unsigned char *)hdr + mmap_size - the_hash_algo->rawsz);
|
|
istate->version = ntohl(hdr->hdr_version);
|
|
istate->cache_nr = ntohl(hdr->hdr_entries);
|
|
istate->cache_alloc = alloc_nr(istate->cache_nr);
|
|
istate->cache = xcalloc(istate->cache_alloc, sizeof(*istate->cache));
|
|
istate->initialized = 1;
|
|
|
|
p.istate = istate;
|
|
p.mmap = mmap;
|
|
p.mmap_size = mmap_size;
|
|
|
|
src_offset = sizeof(*hdr);
|
|
|
|
#ifndef NO_PTHREADS
|
|
nr_threads = git_config_get_index_threads();
|
|
|
|
/* TODO: does creating more threads than cores help? */
|
|
if (!nr_threads) {
|
|
nr_threads = istate->cache_nr / THREAD_COST;
|
|
cpus = online_cpus();
|
|
if (nr_threads > cpus)
|
|
nr_threads = cpus;
|
|
}
|
|
|
|
if (nr_threads > 1) {
|
|
extension_offset = read_eoie_extension(mmap, mmap_size);
|
|
if (extension_offset) {
|
|
int err;
|
|
|
|
p.src_offset = extension_offset;
|
|
err = pthread_create(&p.pthread, NULL, load_index_extensions, &p);
|
|
if (err)
|
|
die(_("unable to create load_index_extensions thread: %s"), strerror(err));
|
|
|
|
nr_threads--;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Locate and read the index entry offset table so that we can use it
|
|
* to multi-thread the reading of the cache entries.
|
|
*/
|
|
if (extension_offset && nr_threads > 1)
|
|
ieot = read_ieot_extension(mmap, mmap_size, extension_offset);
|
|
|
|
if (ieot) {
|
|
src_offset += load_cache_entries_threaded(istate, mmap, mmap_size, src_offset, nr_threads, ieot);
|
|
free(ieot);
|
|
} else {
|
|
src_offset += load_all_cache_entries(istate, mmap, mmap_size, src_offset);
|
|
}
|
|
#else
|
|
src_offset += load_all_cache_entries(istate, mmap, mmap_size, src_offset);
|
|
#endif
|
|
|
|
istate->timestamp.sec = st.st_mtime;
|
|
istate->timestamp.nsec = ST_MTIME_NSEC(st);
|
|
|
|
/* if we created a thread, join it otherwise load the extensions on the primary thread */
|
|
#ifndef NO_PTHREADS
|
|
if (extension_offset) {
|
|
int ret = pthread_join(p.pthread, NULL);
|
|
if (ret)
|
|
die(_("unable to join load_index_extensions thread: %s"), strerror(ret));
|
|
}
|
|
#endif
|
|
if (!extension_offset) {
|
|
p.src_offset = src_offset;
|
|
load_index_extensions(&p);
|
|
}
|
|
munmap((void *)mmap, mmap_size);
|
|
return istate->cache_nr;
|
|
|
|
unmap:
|
|
munmap((void *)mmap, mmap_size);
|
|
die("index file corrupt");
|
|
}
|
|
|
|
/*
|
|
* Signal that the shared index is used by updating its mtime.
|
|
*
|
|
* This way, shared index can be removed if they have not been used
|
|
* for some time.
|
|
*/
|
|
static void freshen_shared_index(const char *shared_index, int warn)
|
|
{
|
|
if (!check_and_freshen_file(shared_index, 1) && warn)
|
|
warning("could not freshen shared index '%s'", shared_index);
|
|
}
|
|
|
|
int read_index_from(struct index_state *istate, const char *path,
|
|
const char *gitdir)
|
|
{
|
|
struct split_index *split_index;
|
|
int ret;
|
|
char *base_oid_hex;
|
|
char *base_path;
|
|
|
|
/* istate->initialized covers both .git/index and .git/sharedindex.xxx */
|
|
if (istate->initialized)
|
|
return istate->cache_nr;
|
|
|
|
trace_performance_enter();
|
|
ret = do_read_index(istate, path, 0);
|
|
trace_performance_leave("read cache %s", path);
|
|
|
|
split_index = istate->split_index;
|
|
if (!split_index || is_null_oid(&split_index->base_oid)) {
|
|
post_read_index_from(istate);
|
|
return ret;
|
|
}
|
|
|
|
trace_performance_enter();
|
|
if (split_index->base)
|
|
discard_index(split_index->base);
|
|
else
|
|
split_index->base = xcalloc(1, sizeof(*split_index->base));
|
|
|
|
base_oid_hex = oid_to_hex(&split_index->base_oid);
|
|
base_path = xstrfmt("%s/sharedindex.%s", gitdir, base_oid_hex);
|
|
ret = do_read_index(split_index->base, base_path, 1);
|
|
if (!oideq(&split_index->base_oid, &split_index->base->oid))
|
|
die("broken index, expect %s in %s, got %s",
|
|
base_oid_hex, base_path,
|
|
oid_to_hex(&split_index->base->oid));
|
|
|
|
freshen_shared_index(base_path, 0);
|
|
merge_base_index(istate);
|
|
post_read_index_from(istate);
|
|
free(base_path);
|
|
trace_performance_leave("read cache %s", base_path);
|
|
return ret;
|
|
}
|
|
|
|
int is_index_unborn(struct index_state *istate)
|
|
{
|
|
return (!istate->cache_nr && !istate->timestamp.sec);
|
|
}
|
|
|
|
int discard_index(struct index_state *istate)
|
|
{
|
|
/*
|
|
* Cache entries in istate->cache[] should have been allocated
|
|
* from the memory pool associated with this index, or from an
|
|
* associated split_index. There is no need to free individual
|
|
* cache entries. validate_cache_entries can detect when this
|
|
* assertion does not hold.
|
|
*/
|
|
validate_cache_entries(istate);
|
|
|
|
resolve_undo_clear_index(istate);
|
|
istate->cache_nr = 0;
|
|
istate->cache_changed = 0;
|
|
istate->timestamp.sec = 0;
|
|
istate->timestamp.nsec = 0;
|
|
free_name_hash(istate);
|
|
cache_tree_free(&(istate->cache_tree));
|
|
istate->initialized = 0;
|
|
FREE_AND_NULL(istate->cache);
|
|
istate->cache_alloc = 0;
|
|
discard_split_index(istate);
|
|
free_untracked_cache(istate->untracked);
|
|
istate->untracked = NULL;
|
|
|
|
if (istate->ce_mem_pool) {
|
|
mem_pool_discard(istate->ce_mem_pool, should_validate_cache_entries());
|
|
istate->ce_mem_pool = NULL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Validate the cache entries of this index.
|
|
* All cache entries associated with this index
|
|
* should have been allocated by the memory pool
|
|
* associated with this index, or by a referenced
|
|
* split index.
|
|
*/
|
|
void validate_cache_entries(const struct index_state *istate)
|
|
{
|
|
int i;
|
|
|
|
if (!should_validate_cache_entries() ||!istate || !istate->initialized)
|
|
return;
|
|
|
|
for (i = 0; i < istate->cache_nr; i++) {
|
|
if (!istate) {
|
|
die("internal error: cache entry is not allocated from expected memory pool");
|
|
} else if (!istate->ce_mem_pool ||
|
|
!mem_pool_contains(istate->ce_mem_pool, istate->cache[i])) {
|
|
if (!istate->split_index ||
|
|
!istate->split_index->base ||
|
|
!istate->split_index->base->ce_mem_pool ||
|
|
!mem_pool_contains(istate->split_index->base->ce_mem_pool, istate->cache[i])) {
|
|
die("internal error: cache entry is not allocated from expected memory pool");
|
|
}
|
|
}
|
|
}
|
|
|
|
if (istate->split_index)
|
|
validate_cache_entries(istate->split_index->base);
|
|
}
|
|
|
|
int unmerged_index(const struct index_state *istate)
|
|
{
|
|
int i;
|
|
for (i = 0; i < istate->cache_nr; i++) {
|
|
if (ce_stage(istate->cache[i]))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int index_has_changes(struct index_state *istate,
|
|
struct tree *tree,
|
|
struct strbuf *sb)
|
|
{
|
|
struct object_id cmp;
|
|
int i;
|
|
|
|
if (istate != &the_index) {
|
|
BUG("index_has_changes cannot yet accept istate != &the_index; do_diff_cache needs updating first.");
|
|
}
|
|
if (tree)
|
|
cmp = tree->object.oid;
|
|
if (tree || !get_oid_tree("HEAD", &cmp)) {
|
|
struct diff_options opt;
|
|
|
|
repo_diff_setup(the_repository, &opt);
|
|
opt.flags.exit_with_status = 1;
|
|
if (!sb)
|
|
opt.flags.quick = 1;
|
|
do_diff_cache(&cmp, &opt);
|
|
diffcore_std(&opt);
|
|
for (i = 0; sb && i < diff_queued_diff.nr; i++) {
|
|
if (i)
|
|
strbuf_addch(sb, ' ');
|
|
strbuf_addstr(sb, diff_queued_diff.queue[i]->two->path);
|
|
}
|
|
diff_flush(&opt);
|
|
return opt.flags.has_changes != 0;
|
|
} else {
|
|
for (i = 0; sb && i < istate->cache_nr; i++) {
|
|
if (i)
|
|
strbuf_addch(sb, ' ');
|
|
strbuf_addstr(sb, istate->cache[i]->name);
|
|
}
|
|
return !!istate->cache_nr;
|
|
}
|
|
}
|
|
|
|
#define WRITE_BUFFER_SIZE 8192
|
|
static unsigned char write_buffer[WRITE_BUFFER_SIZE];
|
|
static unsigned long write_buffer_len;
|
|
|
|
static int ce_write_flush(git_hash_ctx *context, int fd)
|
|
{
|
|
unsigned int buffered = write_buffer_len;
|
|
if (buffered) {
|
|
the_hash_algo->update_fn(context, write_buffer, buffered);
|
|
if (write_in_full(fd, write_buffer, buffered) < 0)
|
|
return -1;
|
|
write_buffer_len = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int ce_write(git_hash_ctx *context, int fd, void *data, unsigned int len)
|
|
{
|
|
while (len) {
|
|
unsigned int buffered = write_buffer_len;
|
|
unsigned int partial = WRITE_BUFFER_SIZE - buffered;
|
|
if (partial > len)
|
|
partial = len;
|
|
memcpy(write_buffer + buffered, data, partial);
|
|
buffered += partial;
|
|
if (buffered == WRITE_BUFFER_SIZE) {
|
|
write_buffer_len = buffered;
|
|
if (ce_write_flush(context, fd))
|
|
return -1;
|
|
buffered = 0;
|
|
}
|
|
write_buffer_len = buffered;
|
|
len -= partial;
|
|
data = (char *) data + partial;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int write_index_ext_header(git_hash_ctx *context, git_hash_ctx *eoie_context,
|
|
int fd, unsigned int ext, unsigned int sz)
|
|
{
|
|
ext = htonl(ext);
|
|
sz = htonl(sz);
|
|
if (eoie_context) {
|
|
the_hash_algo->update_fn(eoie_context, &ext, 4);
|
|
the_hash_algo->update_fn(eoie_context, &sz, 4);
|
|
}
|
|
return ((ce_write(context, fd, &ext, 4) < 0) ||
|
|
(ce_write(context, fd, &sz, 4) < 0)) ? -1 : 0;
|
|
}
|
|
|
|
static int ce_flush(git_hash_ctx *context, int fd, unsigned char *hash)
|
|
{
|
|
unsigned int left = write_buffer_len;
|
|
|
|
if (left) {
|
|
write_buffer_len = 0;
|
|
the_hash_algo->update_fn(context, write_buffer, left);
|
|
}
|
|
|
|
/* Flush first if not enough space for hash signature */
|
|
if (left + the_hash_algo->rawsz > WRITE_BUFFER_SIZE) {
|
|
if (write_in_full(fd, write_buffer, left) < 0)
|
|
return -1;
|
|
left = 0;
|
|
}
|
|
|
|
/* Append the hash signature at the end */
|
|
the_hash_algo->final_fn(write_buffer + left, context);
|
|
hashcpy(hash, write_buffer + left);
|
|
left += the_hash_algo->rawsz;
|
|
return (write_in_full(fd, write_buffer, left) < 0) ? -1 : 0;
|
|
}
|
|
|
|
static void ce_smudge_racily_clean_entry(struct index_state *istate,
|
|
struct cache_entry *ce)
|
|
{
|
|
/*
|
|
* The only thing we care about in this function is to smudge the
|
|
* falsely clean entry due to touch-update-touch race, so we leave
|
|
* everything else as they are. We are called for entries whose
|
|
* ce_stat_data.sd_mtime match the index file mtime.
|
|
*
|
|
* Note that this actually does not do much for gitlinks, for
|
|
* which ce_match_stat_basic() always goes to the actual
|
|
* contents. The caller checks with is_racy_timestamp() which
|
|
* always says "no" for gitlinks, so we are not called for them ;-)
|
|
*/
|
|
struct stat st;
|
|
|
|
if (lstat(ce->name, &st) < 0)
|
|
return;
|
|
if (ce_match_stat_basic(ce, &st))
|
|
return;
|
|
if (ce_modified_check_fs(istate, ce, &st)) {
|
|
/* This is "racily clean"; smudge it. Note that this
|
|
* is a tricky code. At first glance, it may appear
|
|
* that it can break with this sequence:
|
|
*
|
|
* $ echo xyzzy >frotz
|
|
* $ git-update-index --add frotz
|
|
* $ : >frotz
|
|
* $ sleep 3
|
|
* $ echo filfre >nitfol
|
|
* $ git-update-index --add nitfol
|
|
*
|
|
* but it does not. When the second update-index runs,
|
|
* it notices that the entry "frotz" has the same timestamp
|
|
* as index, and if we were to smudge it by resetting its
|
|
* size to zero here, then the object name recorded
|
|
* in index is the 6-byte file but the cached stat information
|
|
* becomes zero --- which would then match what we would
|
|
* obtain from the filesystem next time we stat("frotz").
|
|
*
|
|
* However, the second update-index, before calling
|
|
* this function, notices that the cached size is 6
|
|
* bytes and what is on the filesystem is an empty
|
|
* file, and never calls us, so the cached size information
|
|
* for "frotz" stays 6 which does not match the filesystem.
|
|
*/
|
|
ce->ce_stat_data.sd_size = 0;
|
|
}
|
|
}
|
|
|
|
/* Copy miscellaneous fields but not the name */
|
|
static void copy_cache_entry_to_ondisk(struct ondisk_cache_entry *ondisk,
|
|
struct cache_entry *ce)
|
|
{
|
|
short flags;
|
|
|
|
ondisk->ctime.sec = htonl(ce->ce_stat_data.sd_ctime.sec);
|
|
ondisk->mtime.sec = htonl(ce->ce_stat_data.sd_mtime.sec);
|
|
ondisk->ctime.nsec = htonl(ce->ce_stat_data.sd_ctime.nsec);
|
|
ondisk->mtime.nsec = htonl(ce->ce_stat_data.sd_mtime.nsec);
|
|
ondisk->dev = htonl(ce->ce_stat_data.sd_dev);
|
|
ondisk->ino = htonl(ce->ce_stat_data.sd_ino);
|
|
ondisk->mode = htonl(ce->ce_mode);
|
|
ondisk->uid = htonl(ce->ce_stat_data.sd_uid);
|
|
ondisk->gid = htonl(ce->ce_stat_data.sd_gid);
|
|
ondisk->size = htonl(ce->ce_stat_data.sd_size);
|
|
hashcpy(ondisk->sha1, ce->oid.hash);
|
|
|
|
flags = ce->ce_flags & ~CE_NAMEMASK;
|
|
flags |= (ce_namelen(ce) >= CE_NAMEMASK ? CE_NAMEMASK : ce_namelen(ce));
|
|
ondisk->flags = htons(flags);
|
|
if (ce->ce_flags & CE_EXTENDED) {
|
|
struct ondisk_cache_entry_extended *ondisk2;
|
|
ondisk2 = (struct ondisk_cache_entry_extended *)ondisk;
|
|
ondisk2->flags2 = htons((ce->ce_flags & CE_EXTENDED_FLAGS) >> 16);
|
|
}
|
|
}
|
|
|
|
static int ce_write_entry(git_hash_ctx *c, int fd, struct cache_entry *ce,
|
|
struct strbuf *previous_name, struct ondisk_cache_entry *ondisk)
|
|
{
|
|
int size;
|
|
int result;
|
|
unsigned int saved_namelen;
|
|
int stripped_name = 0;
|
|
static unsigned char padding[8] = { 0x00 };
|
|
|
|
if (ce->ce_flags & CE_STRIP_NAME) {
|
|
saved_namelen = ce_namelen(ce);
|
|
ce->ce_namelen = 0;
|
|
stripped_name = 1;
|
|
}
|
|
|
|
if (ce->ce_flags & CE_EXTENDED)
|
|
size = offsetof(struct ondisk_cache_entry_extended, name);
|
|
else
|
|
size = offsetof(struct ondisk_cache_entry, name);
|
|
|
|
if (!previous_name) {
|
|
int len = ce_namelen(ce);
|
|
copy_cache_entry_to_ondisk(ondisk, ce);
|
|
result = ce_write(c, fd, ondisk, size);
|
|
if (!result)
|
|
result = ce_write(c, fd, ce->name, len);
|
|
if (!result)
|
|
result = ce_write(c, fd, padding, align_padding_size(size, len));
|
|
} else {
|
|
int common, to_remove, prefix_size;
|
|
unsigned char to_remove_vi[16];
|
|
for (common = 0;
|
|
(ce->name[common] &&
|
|
common < previous_name->len &&
|
|
ce->name[common] == previous_name->buf[common]);
|
|
common++)
|
|
; /* still matching */
|
|
to_remove = previous_name->len - common;
|
|
prefix_size = encode_varint(to_remove, to_remove_vi);
|
|
|
|
copy_cache_entry_to_ondisk(ondisk, ce);
|
|
result = ce_write(c, fd, ondisk, size);
|
|
if (!result)
|
|
result = ce_write(c, fd, to_remove_vi, prefix_size);
|
|
if (!result)
|
|
result = ce_write(c, fd, ce->name + common, ce_namelen(ce) - common);
|
|
if (!result)
|
|
result = ce_write(c, fd, padding, 1);
|
|
|
|
strbuf_splice(previous_name, common, to_remove,
|
|
ce->name + common, ce_namelen(ce) - common);
|
|
}
|
|
if (stripped_name) {
|
|
ce->ce_namelen = saved_namelen;
|
|
ce->ce_flags &= ~CE_STRIP_NAME;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* This function verifies if index_state has the correct sha1 of the
|
|
* index file. Don't die if we have any other failure, just return 0.
|
|
*/
|
|
static int verify_index_from(const struct index_state *istate, const char *path)
|
|
{
|
|
int fd;
|
|
ssize_t n;
|
|
struct stat st;
|
|
unsigned char hash[GIT_MAX_RAWSZ];
|
|
|
|
if (!istate->initialized)
|
|
return 0;
|
|
|
|
fd = open(path, O_RDONLY);
|
|
if (fd < 0)
|
|
return 0;
|
|
|
|
if (fstat(fd, &st))
|
|
goto out;
|
|
|
|
if (st.st_size < sizeof(struct cache_header) + the_hash_algo->rawsz)
|
|
goto out;
|
|
|
|
n = pread_in_full(fd, hash, the_hash_algo->rawsz, st.st_size - the_hash_algo->rawsz);
|
|
if (n != the_hash_algo->rawsz)
|
|
goto out;
|
|
|
|
if (!hasheq(istate->oid.hash, hash))
|
|
goto out;
|
|
|
|
close(fd);
|
|
return 1;
|
|
|
|
out:
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
static int verify_index(const struct index_state *istate)
|
|
{
|
|
return verify_index_from(istate, get_index_file());
|
|
}
|
|
|
|
static int has_racy_timestamp(struct index_state *istate)
|
|
{
|
|
int entries = istate->cache_nr;
|
|
int i;
|
|
|
|
for (i = 0; i < entries; i++) {
|
|
struct cache_entry *ce = istate->cache[i];
|
|
if (is_racy_timestamp(istate, ce))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void update_index_if_able(struct index_state *istate, struct lock_file *lockfile)
|
|
{
|
|
if ((istate->cache_changed || has_racy_timestamp(istate)) &&
|
|
verify_index(istate))
|
|
write_locked_index(istate, lockfile, COMMIT_LOCK);
|
|
else
|
|
rollback_lock_file(lockfile);
|
|
}
|
|
|
|
/*
|
|
* On success, `tempfile` is closed. If it is the temporary file
|
|
* of a `struct lock_file`, we will therefore effectively perform
|
|
* a 'close_lock_file_gently()`. Since that is an implementation
|
|
* detail of lockfiles, callers of `do_write_index()` should not
|
|
* rely on it.
|
|
*/
|
|
static int do_write_index(struct index_state *istate, struct tempfile *tempfile,
|
|
int strip_extensions)
|
|
{
|
|
uint64_t start = getnanotime();
|
|
int newfd = tempfile->fd;
|
|
git_hash_ctx c, eoie_c;
|
|
struct cache_header hdr;
|
|
int i, err = 0, removed, extended, hdr_version;
|
|
struct cache_entry **cache = istate->cache;
|
|
int entries = istate->cache_nr;
|
|
struct stat st;
|
|
struct ondisk_cache_entry_extended ondisk;
|
|
struct strbuf previous_name_buf = STRBUF_INIT, *previous_name;
|
|
int drop_cache_tree = istate->drop_cache_tree;
|
|
off_t offset;
|
|
int ieot_entries = 1;
|
|
struct index_entry_offset_table *ieot = NULL;
|
|
int nr, nr_threads;
|
|
|
|
for (i = removed = extended = 0; i < entries; i++) {
|
|
if (cache[i]->ce_flags & CE_REMOVE)
|
|
removed++;
|
|
|
|
/* reduce extended entries if possible */
|
|
cache[i]->ce_flags &= ~CE_EXTENDED;
|
|
if (cache[i]->ce_flags & CE_EXTENDED_FLAGS) {
|
|
extended++;
|
|
cache[i]->ce_flags |= CE_EXTENDED;
|
|
}
|
|
}
|
|
|
|
if (!istate->version) {
|
|
istate->version = get_index_format_default();
|
|
if (git_env_bool("GIT_TEST_SPLIT_INDEX", 0))
|
|
init_split_index(istate);
|
|
}
|
|
|
|
/* demote version 3 to version 2 when the latter suffices */
|
|
if (istate->version == 3 || istate->version == 2)
|
|
istate->version = extended ? 3 : 2;
|
|
|
|
hdr_version = istate->version;
|
|
|
|
hdr.hdr_signature = htonl(CACHE_SIGNATURE);
|
|
hdr.hdr_version = htonl(hdr_version);
|
|
hdr.hdr_entries = htonl(entries - removed);
|
|
|
|
the_hash_algo->init_fn(&c);
|
|
if (ce_write(&c, newfd, &hdr, sizeof(hdr)) < 0)
|
|
return -1;
|
|
|
|
#ifndef NO_PTHREADS
|
|
nr_threads = git_config_get_index_threads();
|
|
if (nr_threads != 1) {
|
|
int ieot_blocks, cpus;
|
|
|
|
/*
|
|
* ensure default number of ieot blocks maps evenly to the
|
|
* default number of threads that will process them leaving
|
|
* room for the thread to load the index extensions.
|
|
*/
|
|
if (!nr_threads) {
|
|
ieot_blocks = istate->cache_nr / THREAD_COST;
|
|
cpus = online_cpus();
|
|
if (ieot_blocks > cpus - 1)
|
|
ieot_blocks = cpus - 1;
|
|
} else {
|
|
ieot_blocks = nr_threads;
|
|
if (ieot_blocks > istate->cache_nr)
|
|
ieot_blocks = istate->cache_nr;
|
|
}
|
|
|
|
/*
|
|
* no reason to write out the IEOT extension if we don't
|
|
* have enough blocks to utilize multi-threading
|
|
*/
|
|
if (ieot_blocks > 1) {
|
|
ieot = xcalloc(1, sizeof(struct index_entry_offset_table)
|
|
+ (ieot_blocks * sizeof(struct index_entry_offset)));
|
|
ieot_entries = DIV_ROUND_UP(entries, ieot_blocks);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
offset = lseek(newfd, 0, SEEK_CUR);
|
|
if (offset < 0) {
|
|
free(ieot);
|
|
return -1;
|
|
}
|
|
offset += write_buffer_len;
|
|
nr = 0;
|
|
previous_name = (hdr_version == 4) ? &previous_name_buf : NULL;
|
|
|
|
for (i = 0; i < entries; i++) {
|
|
struct cache_entry *ce = cache[i];
|
|
if (ce->ce_flags & CE_REMOVE)
|
|
continue;
|
|
if (!ce_uptodate(ce) && is_racy_timestamp(istate, ce))
|
|
ce_smudge_racily_clean_entry(istate, ce);
|
|
if (is_null_oid(&ce->oid)) {
|
|
static const char msg[] = "cache entry has null sha1: %s";
|
|
static int allow = -1;
|
|
|
|
if (allow < 0)
|
|
allow = git_env_bool("GIT_ALLOW_NULL_SHA1", 0);
|
|
if (allow)
|
|
warning(msg, ce->name);
|
|
else
|
|
err = error(msg, ce->name);
|
|
|
|
drop_cache_tree = 1;
|
|
}
|
|
if (ieot && i && (i % ieot_entries == 0)) {
|
|
ieot->entries[ieot->nr].nr = nr;
|
|
ieot->entries[ieot->nr].offset = offset;
|
|
ieot->nr++;
|
|
/*
|
|
* If we have a V4 index, set the first byte to an invalid
|
|
* character to ensure there is nothing common with the previous
|
|
* entry
|
|
*/
|
|
if (previous_name)
|
|
previous_name->buf[0] = 0;
|
|
nr = 0;
|
|
offset = lseek(newfd, 0, SEEK_CUR);
|
|
if (offset < 0) {
|
|
free(ieot);
|
|
return -1;
|
|
}
|
|
offset += write_buffer_len;
|
|
}
|
|
if (ce_write_entry(&c, newfd, ce, previous_name, (struct ondisk_cache_entry *)&ondisk) < 0)
|
|
err = -1;
|
|
|
|
if (err)
|
|
break;
|
|
nr++;
|
|
}
|
|
if (ieot && nr) {
|
|
ieot->entries[ieot->nr].nr = nr;
|
|
ieot->entries[ieot->nr].offset = offset;
|
|
ieot->nr++;
|
|
}
|
|
strbuf_release(&previous_name_buf);
|
|
|
|
if (err) {
|
|
free(ieot);
|
|
return err;
|
|
}
|
|
|
|
/* Write extension data here */
|
|
offset = lseek(newfd, 0, SEEK_CUR);
|
|
if (offset < 0) {
|
|
free(ieot);
|
|
return -1;
|
|
}
|
|
offset += write_buffer_len;
|
|
the_hash_algo->init_fn(&eoie_c);
|
|
|
|
/*
|
|
* Lets write out CACHE_EXT_INDEXENTRYOFFSETTABLE first so that we
|
|
* can minimize the number of extensions we have to scan through to
|
|
* find it during load. Write it out regardless of the
|
|
* strip_extensions parameter as we need it when loading the shared
|
|
* index.
|
|
*/
|
|
#ifndef NO_PTHREADS
|
|
if (ieot) {
|
|
struct strbuf sb = STRBUF_INIT;
|
|
|
|
write_ieot_extension(&sb, ieot);
|
|
err = write_index_ext_header(&c, &eoie_c, newfd, CACHE_EXT_INDEXENTRYOFFSETTABLE, sb.len) < 0
|
|
|| ce_write(&c, newfd, sb.buf, sb.len) < 0;
|
|
strbuf_release(&sb);
|
|
free(ieot);
|
|
if (err)
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
if (!strip_extensions && istate->split_index) {
|
|
struct strbuf sb = STRBUF_INIT;
|
|
|
|
err = write_link_extension(&sb, istate) < 0 ||
|
|
write_index_ext_header(&c, &eoie_c, newfd, CACHE_EXT_LINK,
|
|
sb.len) < 0 ||
|
|
ce_write(&c, newfd, sb.buf, sb.len) < 0;
|
|
strbuf_release(&sb);
|
|
if (err)
|
|
return -1;
|
|
}
|
|
if (!strip_extensions && !drop_cache_tree && istate->cache_tree) {
|
|
struct strbuf sb = STRBUF_INIT;
|
|
|
|
cache_tree_write(&sb, istate->cache_tree);
|
|
err = write_index_ext_header(&c, &eoie_c, newfd, CACHE_EXT_TREE, sb.len) < 0
|
|
|| ce_write(&c, newfd, sb.buf, sb.len) < 0;
|
|
strbuf_release(&sb);
|
|
if (err)
|
|
return -1;
|
|
}
|
|
if (!strip_extensions && istate->resolve_undo) {
|
|
struct strbuf sb = STRBUF_INIT;
|
|
|
|
resolve_undo_write(&sb, istate->resolve_undo);
|
|
err = write_index_ext_header(&c, &eoie_c, newfd, CACHE_EXT_RESOLVE_UNDO,
|
|
sb.len) < 0
|
|
|| ce_write(&c, newfd, sb.buf, sb.len) < 0;
|
|
strbuf_release(&sb);
|
|
if (err)
|
|
return -1;
|
|
}
|
|
if (!strip_extensions && istate->untracked) {
|
|
struct strbuf sb = STRBUF_INIT;
|
|
|
|
write_untracked_extension(&sb, istate->untracked);
|
|
err = write_index_ext_header(&c, &eoie_c, newfd, CACHE_EXT_UNTRACKED,
|
|
sb.len) < 0 ||
|
|
ce_write(&c, newfd, sb.buf, sb.len) < 0;
|
|
strbuf_release(&sb);
|
|
if (err)
|
|
return -1;
|
|
}
|
|
if (!strip_extensions && istate->fsmonitor_last_update) {
|
|
struct strbuf sb = STRBUF_INIT;
|
|
|
|
write_fsmonitor_extension(&sb, istate);
|
|
err = write_index_ext_header(&c, &eoie_c, newfd, CACHE_EXT_FSMONITOR, sb.len) < 0
|
|
|| ce_write(&c, newfd, sb.buf, sb.len) < 0;
|
|
strbuf_release(&sb);
|
|
if (err)
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* CACHE_EXT_ENDOFINDEXENTRIES must be written as the last entry before the SHA1
|
|
* so that it can be found and processed before all the index entries are
|
|
* read. Write it out regardless of the strip_extensions parameter as we need it
|
|
* when loading the shared index.
|
|
*/
|
|
if (offset) {
|
|
struct strbuf sb = STRBUF_INIT;
|
|
|
|
write_eoie_extension(&sb, &eoie_c, offset);
|
|
err = write_index_ext_header(&c, NULL, newfd, CACHE_EXT_ENDOFINDEXENTRIES, sb.len) < 0
|
|
|| ce_write(&c, newfd, sb.buf, sb.len) < 0;
|
|
strbuf_release(&sb);
|
|
if (err)
|
|
return -1;
|
|
}
|
|
|
|
if (ce_flush(&c, newfd, istate->oid.hash))
|
|
return -1;
|
|
if (close_tempfile_gently(tempfile)) {
|
|
error(_("could not close '%s'"), tempfile->filename.buf);
|
|
return -1;
|
|
}
|
|
if (stat(tempfile->filename.buf, &st))
|
|
return -1;
|
|
istate->timestamp.sec = (unsigned int)st.st_mtime;
|
|
istate->timestamp.nsec = ST_MTIME_NSEC(st);
|
|
trace_performance_since(start, "write index, changed mask = %x", istate->cache_changed);
|
|
return 0;
|
|
}
|
|
|
|
void set_alternate_index_output(const char *name)
|
|
{
|
|
alternate_index_output = name;
|
|
}
|
|
|
|
static int commit_locked_index(struct lock_file *lk)
|
|
{
|
|
if (alternate_index_output)
|
|
return commit_lock_file_to(lk, alternate_index_output);
|
|
else
|
|
return commit_lock_file(lk);
|
|
}
|
|
|
|
static int do_write_locked_index(struct index_state *istate, struct lock_file *lock,
|
|
unsigned flags)
|
|
{
|
|
int ret = do_write_index(istate, lock->tempfile, 0);
|
|
if (ret)
|
|
return ret;
|
|
if (flags & COMMIT_LOCK)
|
|
return commit_locked_index(lock);
|
|
return close_lock_file_gently(lock);
|
|
}
|
|
|
|
static int write_split_index(struct index_state *istate,
|
|
struct lock_file *lock,
|
|
unsigned flags)
|
|
{
|
|
int ret;
|
|
prepare_to_write_split_index(istate);
|
|
ret = do_write_locked_index(istate, lock, flags);
|
|
finish_writing_split_index(istate);
|
|
return ret;
|
|
}
|
|
|
|
static const char *shared_index_expire = "2.weeks.ago";
|
|
|
|
static unsigned long get_shared_index_expire_date(void)
|
|
{
|
|
static unsigned long shared_index_expire_date;
|
|
static int shared_index_expire_date_prepared;
|
|
|
|
if (!shared_index_expire_date_prepared) {
|
|
git_config_get_expiry("splitindex.sharedindexexpire",
|
|
&shared_index_expire);
|
|
shared_index_expire_date = approxidate(shared_index_expire);
|
|
shared_index_expire_date_prepared = 1;
|
|
}
|
|
|
|
return shared_index_expire_date;
|
|
}
|
|
|
|
static int should_delete_shared_index(const char *shared_index_path)
|
|
{
|
|
struct stat st;
|
|
unsigned long expiration;
|
|
|
|
/* Check timestamp */
|
|
expiration = get_shared_index_expire_date();
|
|
if (!expiration)
|
|
return 0;
|
|
if (stat(shared_index_path, &st))
|
|
return error_errno(_("could not stat '%s'"), shared_index_path);
|
|
if (st.st_mtime > expiration)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int clean_shared_index_files(const char *current_hex)
|
|
{
|
|
struct dirent *de;
|
|
DIR *dir = opendir(get_git_dir());
|
|
|
|
if (!dir)
|
|
return error_errno(_("unable to open git dir: %s"), get_git_dir());
|
|
|
|
while ((de = readdir(dir)) != NULL) {
|
|
const char *sha1_hex;
|
|
const char *shared_index_path;
|
|
if (!skip_prefix(de->d_name, "sharedindex.", &sha1_hex))
|
|
continue;
|
|
if (!strcmp(sha1_hex, current_hex))
|
|
continue;
|
|
shared_index_path = git_path("%s", de->d_name);
|
|
if (should_delete_shared_index(shared_index_path) > 0 &&
|
|
unlink(shared_index_path))
|
|
warning_errno(_("unable to unlink: %s"), shared_index_path);
|
|
}
|
|
closedir(dir);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int write_shared_index(struct index_state *istate,
|
|
struct tempfile **temp)
|
|
{
|
|
struct split_index *si = istate->split_index;
|
|
int ret;
|
|
|
|
move_cache_to_base_index(istate);
|
|
ret = do_write_index(si->base, *temp, 1);
|
|
if (ret)
|
|
return ret;
|
|
ret = adjust_shared_perm(get_tempfile_path(*temp));
|
|
if (ret) {
|
|
error("cannot fix permission bits on %s", get_tempfile_path(*temp));
|
|
return ret;
|
|
}
|
|
ret = rename_tempfile(temp,
|
|
git_path("sharedindex.%s", oid_to_hex(&si->base->oid)));
|
|
if (!ret) {
|
|
oidcpy(&si->base_oid, &si->base->oid);
|
|
clean_shared_index_files(oid_to_hex(&si->base->oid));
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const int default_max_percent_split_change = 20;
|
|
|
|
static int too_many_not_shared_entries(struct index_state *istate)
|
|
{
|
|
int i, not_shared = 0;
|
|
int max_split = git_config_get_max_percent_split_change();
|
|
|
|
switch (max_split) {
|
|
case -1:
|
|
/* not or badly configured: use the default value */
|
|
max_split = default_max_percent_split_change;
|
|
break;
|
|
case 0:
|
|
return 1; /* 0% means always write a new shared index */
|
|
case 100:
|
|
return 0; /* 100% means never write a new shared index */
|
|
default:
|
|
break; /* just use the configured value */
|
|
}
|
|
|
|
/* Count not shared entries */
|
|
for (i = 0; i < istate->cache_nr; i++) {
|
|
struct cache_entry *ce = istate->cache[i];
|
|
if (!ce->index)
|
|
not_shared++;
|
|
}
|
|
|
|
return (int64_t)istate->cache_nr * max_split < (int64_t)not_shared * 100;
|
|
}
|
|
|
|
int write_locked_index(struct index_state *istate, struct lock_file *lock,
|
|
unsigned flags)
|
|
{
|
|
int new_shared_index, ret;
|
|
struct split_index *si = istate->split_index;
|
|
|
|
if (git_env_bool("GIT_TEST_CHECK_CACHE_TREE", 0))
|
|
cache_tree_verify(istate);
|
|
|
|
if ((flags & SKIP_IF_UNCHANGED) && !istate->cache_changed) {
|
|
if (flags & COMMIT_LOCK)
|
|
rollback_lock_file(lock);
|
|
return 0;
|
|
}
|
|
|
|
if (istate->fsmonitor_last_update)
|
|
fill_fsmonitor_bitmap(istate);
|
|
|
|
if (!si || alternate_index_output ||
|
|
(istate->cache_changed & ~EXTMASK)) {
|
|
if (si)
|
|
oidclr(&si->base_oid);
|
|
ret = do_write_locked_index(istate, lock, flags);
|
|
goto out;
|
|
}
|
|
|
|
if (git_env_bool("GIT_TEST_SPLIT_INDEX", 0)) {
|
|
int v = si->base_oid.hash[0];
|
|
if ((v & 15) < 6)
|
|
istate->cache_changed |= SPLIT_INDEX_ORDERED;
|
|
}
|
|
if (too_many_not_shared_entries(istate))
|
|
istate->cache_changed |= SPLIT_INDEX_ORDERED;
|
|
|
|
new_shared_index = istate->cache_changed & SPLIT_INDEX_ORDERED;
|
|
|
|
if (new_shared_index) {
|
|
struct tempfile *temp;
|
|
int saved_errno;
|
|
|
|
temp = mks_tempfile(git_path("sharedindex_XXXXXX"));
|
|
if (!temp) {
|
|
oidclr(&si->base_oid);
|
|
ret = do_write_locked_index(istate, lock, flags);
|
|
goto out;
|
|
}
|
|
ret = write_shared_index(istate, &temp);
|
|
|
|
saved_errno = errno;
|
|
if (is_tempfile_active(temp))
|
|
delete_tempfile(&temp);
|
|
errno = saved_errno;
|
|
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
ret = write_split_index(istate, lock, flags);
|
|
|
|
/* Freshen the shared index only if the split-index was written */
|
|
if (!ret && !new_shared_index) {
|
|
const char *shared_index = git_path("sharedindex.%s",
|
|
oid_to_hex(&si->base_oid));
|
|
freshen_shared_index(shared_index, 1);
|
|
}
|
|
|
|
out:
|
|
if (flags & COMMIT_LOCK)
|
|
rollback_lock_file(lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Read the index file that is potentially unmerged into given
|
|
* index_state, dropping any unmerged entries to stage #0 (potentially
|
|
* resulting in a path appearing as both a file and a directory in the
|
|
* index; the caller is responsible to clear out the extra entries
|
|
* before writing the index to a tree). Returns true if the index is
|
|
* unmerged. Callers who want to refuse to work from an unmerged
|
|
* state can call this and check its return value, instead of calling
|
|
* read_cache().
|
|
*/
|
|
int read_index_unmerged(struct index_state *istate)
|
|
{
|
|
int i;
|
|
int unmerged = 0;
|
|
|
|
read_index(istate);
|
|
for (i = 0; i < istate->cache_nr; i++) {
|
|
struct cache_entry *ce = istate->cache[i];
|
|
struct cache_entry *new_ce;
|
|
int len;
|
|
|
|
if (!ce_stage(ce))
|
|
continue;
|
|
unmerged = 1;
|
|
len = ce_namelen(ce);
|
|
new_ce = make_empty_cache_entry(istate, len);
|
|
memcpy(new_ce->name, ce->name, len);
|
|
new_ce->ce_flags = create_ce_flags(0) | CE_CONFLICTED;
|
|
new_ce->ce_namelen = len;
|
|
new_ce->ce_mode = ce->ce_mode;
|
|
if (add_index_entry(istate, new_ce, ADD_CACHE_SKIP_DFCHECK))
|
|
return error("%s: cannot drop to stage #0",
|
|
new_ce->name);
|
|
}
|
|
return unmerged;
|
|
}
|
|
|
|
/*
|
|
* Returns 1 if the path is an "other" path with respect to
|
|
* the index; that is, the path is not mentioned in the index at all,
|
|
* either as a file, a directory with some files in the index,
|
|
* or as an unmerged entry.
|
|
*
|
|
* We helpfully remove a trailing "/" from directories so that
|
|
* the output of read_directory can be used as-is.
|
|
*/
|
|
int index_name_is_other(const struct index_state *istate, const char *name,
|
|
int namelen)
|
|
{
|
|
int pos;
|
|
if (namelen && name[namelen - 1] == '/')
|
|
namelen--;
|
|
pos = index_name_pos(istate, name, namelen);
|
|
if (0 <= pos)
|
|
return 0; /* exact match */
|
|
pos = -pos - 1;
|
|
if (pos < istate->cache_nr) {
|
|
struct cache_entry *ce = istate->cache[pos];
|
|
if (ce_namelen(ce) == namelen &&
|
|
!memcmp(ce->name, name, namelen))
|
|
return 0; /* Yup, this one exists unmerged */
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
void *read_blob_data_from_index(const struct index_state *istate,
|
|
const char *path, unsigned long *size)
|
|
{
|
|
int pos, len;
|
|
unsigned long sz;
|
|
enum object_type type;
|
|
void *data;
|
|
|
|
len = strlen(path);
|
|
pos = index_name_pos(istate, path, len);
|
|
if (pos < 0) {
|
|
/*
|
|
* We might be in the middle of a merge, in which
|
|
* case we would read stage #2 (ours).
|
|
*/
|
|
int i;
|
|
for (i = -pos - 1;
|
|
(pos < 0 && i < istate->cache_nr &&
|
|
!strcmp(istate->cache[i]->name, path));
|
|
i++)
|
|
if (ce_stage(istate->cache[i]) == 2)
|
|
pos = i;
|
|
}
|
|
if (pos < 0)
|
|
return NULL;
|
|
data = read_object_file(&istate->cache[pos]->oid, &type, &sz);
|
|
if (!data || type != OBJ_BLOB) {
|
|
free(data);
|
|
return NULL;
|
|
}
|
|
if (size)
|
|
*size = sz;
|
|
return data;
|
|
}
|
|
|
|
void stat_validity_clear(struct stat_validity *sv)
|
|
{
|
|
FREE_AND_NULL(sv->sd);
|
|
}
|
|
|
|
int stat_validity_check(struct stat_validity *sv, const char *path)
|
|
{
|
|
struct stat st;
|
|
|
|
if (stat(path, &st) < 0)
|
|
return sv->sd == NULL;
|
|
if (!sv->sd)
|
|
return 0;
|
|
return S_ISREG(st.st_mode) && !match_stat_data(sv->sd, &st);
|
|
}
|
|
|
|
void stat_validity_update(struct stat_validity *sv, int fd)
|
|
{
|
|
struct stat st;
|
|
|
|
if (fstat(fd, &st) < 0 || !S_ISREG(st.st_mode))
|
|
stat_validity_clear(sv);
|
|
else {
|
|
if (!sv->sd)
|
|
sv->sd = xcalloc(1, sizeof(struct stat_data));
|
|
fill_stat_data(sv->sd, &st);
|
|
}
|
|
}
|
|
|
|
void move_index_extensions(struct index_state *dst, struct index_state *src)
|
|
{
|
|
dst->untracked = src->untracked;
|
|
src->untracked = NULL;
|
|
dst->cache_tree = src->cache_tree;
|
|
src->cache_tree = NULL;
|
|
}
|
|
|
|
struct cache_entry *dup_cache_entry(const struct cache_entry *ce,
|
|
struct index_state *istate)
|
|
{
|
|
unsigned int size = ce_size(ce);
|
|
int mem_pool_allocated;
|
|
struct cache_entry *new_entry = make_empty_cache_entry(istate, ce_namelen(ce));
|
|
mem_pool_allocated = new_entry->mem_pool_allocated;
|
|
|
|
memcpy(new_entry, ce, size);
|
|
new_entry->mem_pool_allocated = mem_pool_allocated;
|
|
return new_entry;
|
|
}
|
|
|
|
void discard_cache_entry(struct cache_entry *ce)
|
|
{
|
|
if (ce && should_validate_cache_entries())
|
|
memset(ce, 0xCD, cache_entry_size(ce->ce_namelen));
|
|
|
|
if (ce && ce->mem_pool_allocated)
|
|
return;
|
|
|
|
free(ce);
|
|
}
|
|
|
|
int should_validate_cache_entries(void)
|
|
{
|
|
static int validate_index_cache_entries = -1;
|
|
|
|
if (validate_index_cache_entries < 0) {
|
|
if (getenv("GIT_TEST_VALIDATE_INDEX_CACHE_ENTRIES"))
|
|
validate_index_cache_entries = 1;
|
|
else
|
|
validate_index_cache_entries = 0;
|
|
}
|
|
|
|
return validate_index_cache_entries;
|
|
}
|
|
|
|
#define EOIE_SIZE (4 + GIT_SHA1_RAWSZ) /* <4-byte offset> + <20-byte hash> */
|
|
#define EOIE_SIZE_WITH_HEADER (4 + 4 + EOIE_SIZE) /* <4-byte signature> + <4-byte length> + EOIE_SIZE */
|
|
|
|
static size_t read_eoie_extension(const char *mmap, size_t mmap_size)
|
|
{
|
|
/*
|
|
* The end of index entries (EOIE) extension is guaranteed to be last
|
|
* so that it can be found by scanning backwards from the EOF.
|
|
*
|
|
* "EOIE"
|
|
* <4-byte length>
|
|
* <4-byte offset>
|
|
* <20-byte hash>
|
|
*/
|
|
const char *index, *eoie;
|
|
uint32_t extsize;
|
|
size_t offset, src_offset;
|
|
unsigned char hash[GIT_MAX_RAWSZ];
|
|
git_hash_ctx c;
|
|
|
|
/* ensure we have an index big enough to contain an EOIE extension */
|
|
if (mmap_size < sizeof(struct cache_header) + EOIE_SIZE_WITH_HEADER + the_hash_algo->rawsz)
|
|
return 0;
|
|
|
|
/* validate the extension signature */
|
|
index = eoie = mmap + mmap_size - EOIE_SIZE_WITH_HEADER - the_hash_algo->rawsz;
|
|
if (CACHE_EXT(index) != CACHE_EXT_ENDOFINDEXENTRIES)
|
|
return 0;
|
|
index += sizeof(uint32_t);
|
|
|
|
/* validate the extension size */
|
|
extsize = get_be32(index);
|
|
if (extsize != EOIE_SIZE)
|
|
return 0;
|
|
index += sizeof(uint32_t);
|
|
|
|
/*
|
|
* Validate the offset we're going to look for the first extension
|
|
* signature is after the index header and before the eoie extension.
|
|
*/
|
|
offset = get_be32(index);
|
|
if (mmap + offset < mmap + sizeof(struct cache_header))
|
|
return 0;
|
|
if (mmap + offset >= eoie)
|
|
return 0;
|
|
index += sizeof(uint32_t);
|
|
|
|
/*
|
|
* The hash is computed over extension types and their sizes (but not
|
|
* their contents). E.g. if we have "TREE" extension that is N-bytes
|
|
* long, "REUC" extension that is M-bytes long, followed by "EOIE",
|
|
* then the hash would be:
|
|
*
|
|
* SHA-1("TREE" + <binary representation of N> +
|
|
* "REUC" + <binary representation of M>)
|
|
*/
|
|
src_offset = offset;
|
|
the_hash_algo->init_fn(&c);
|
|
while (src_offset < mmap_size - the_hash_algo->rawsz - EOIE_SIZE_WITH_HEADER) {
|
|
/* After an array of active_nr index entries,
|
|
* there can be arbitrary number of extended
|
|
* sections, each of which is prefixed with
|
|
* extension name (4-byte) and section length
|
|
* in 4-byte network byte order.
|
|
*/
|
|
uint32_t extsize;
|
|
memcpy(&extsize, mmap + src_offset + 4, 4);
|
|
extsize = ntohl(extsize);
|
|
|
|
/* verify the extension size isn't so large it will wrap around */
|
|
if (src_offset + 8 + extsize < src_offset)
|
|
return 0;
|
|
|
|
the_hash_algo->update_fn(&c, mmap + src_offset, 8);
|
|
|
|
src_offset += 8;
|
|
src_offset += extsize;
|
|
}
|
|
the_hash_algo->final_fn(hash, &c);
|
|
if (!hasheq(hash, (const unsigned char *)index))
|
|
return 0;
|
|
|
|
/* Validate that the extension offsets returned us back to the eoie extension. */
|
|
if (src_offset != mmap_size - the_hash_algo->rawsz - EOIE_SIZE_WITH_HEADER)
|
|
return 0;
|
|
|
|
return offset;
|
|
}
|
|
|
|
static void write_eoie_extension(struct strbuf *sb, git_hash_ctx *eoie_context, size_t offset)
|
|
{
|
|
uint32_t buffer;
|
|
unsigned char hash[GIT_MAX_RAWSZ];
|
|
|
|
/* offset */
|
|
put_be32(&buffer, offset);
|
|
strbuf_add(sb, &buffer, sizeof(uint32_t));
|
|
|
|
/* hash */
|
|
the_hash_algo->final_fn(hash, eoie_context);
|
|
strbuf_add(sb, hash, the_hash_algo->rawsz);
|
|
}
|
|
|
|
#ifndef NO_PTHREADS
|
|
#define IEOT_VERSION (1)
|
|
|
|
static struct index_entry_offset_table *read_ieot_extension(const char *mmap, size_t mmap_size, size_t offset)
|
|
{
|
|
const char *index = NULL;
|
|
uint32_t extsize, ext_version;
|
|
struct index_entry_offset_table *ieot;
|
|
int i, nr;
|
|
|
|
/* find the IEOT extension */
|
|
if (!offset)
|
|
return NULL;
|
|
while (offset <= mmap_size - the_hash_algo->rawsz - 8) {
|
|
extsize = get_be32(mmap + offset + 4);
|
|
if (CACHE_EXT((mmap + offset)) == CACHE_EXT_INDEXENTRYOFFSETTABLE) {
|
|
index = mmap + offset + 4 + 4;
|
|
break;
|
|
}
|
|
offset += 8;
|
|
offset += extsize;
|
|
}
|
|
if (!index)
|
|
return NULL;
|
|
|
|
/* validate the version is IEOT_VERSION */
|
|
ext_version = get_be32(index);
|
|
if (ext_version != IEOT_VERSION) {
|
|
error("invalid IEOT version %d", ext_version);
|
|
return NULL;
|
|
}
|
|
index += sizeof(uint32_t);
|
|
|
|
/* extension size - version bytes / bytes per entry */
|
|
nr = (extsize - sizeof(uint32_t)) / (sizeof(uint32_t) + sizeof(uint32_t));
|
|
if (!nr) {
|
|
error("invalid number of IEOT entries %d", nr);
|
|
return NULL;
|
|
}
|
|
ieot = xmalloc(sizeof(struct index_entry_offset_table)
|
|
+ (nr * sizeof(struct index_entry_offset)));
|
|
ieot->nr = nr;
|
|
for (i = 0; i < nr; i++) {
|
|
ieot->entries[i].offset = get_be32(index);
|
|
index += sizeof(uint32_t);
|
|
ieot->entries[i].nr = get_be32(index);
|
|
index += sizeof(uint32_t);
|
|
}
|
|
|
|
return ieot;
|
|
}
|
|
|
|
static void write_ieot_extension(struct strbuf *sb, struct index_entry_offset_table *ieot)
|
|
{
|
|
uint32_t buffer;
|
|
int i;
|
|
|
|
/* version */
|
|
put_be32(&buffer, IEOT_VERSION);
|
|
strbuf_add(sb, &buffer, sizeof(uint32_t));
|
|
|
|
/* ieot */
|
|
for (i = 0; i < ieot->nr; i++) {
|
|
|
|
/* offset */
|
|
put_be32(&buffer, ieot->entries[i].offset);
|
|
strbuf_add(sb, &buffer, sizeof(uint32_t));
|
|
|
|
/* count */
|
|
put_be32(&buffer, ieot->entries[i].nr);
|
|
strbuf_add(sb, &buffer, sizeof(uint32_t));
|
|
}
|
|
}
|
|
#endif
|