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git-commit-vandalism/merge-recursive.c
Stefan Beller a74093da5e tag: add repository argument to deref_tag 
Add a repository argument to allow the callers of deref_tag
to be more specific about which repository to act on. This is a small
mechanical change; it doesn't change the implementation to handle
repositories other than the_repository yet.

As with the previous commits, use a macro to catch callers passing a
repository other than the_repository at compile time.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29 10:43:39 -07:00

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/*
* Recursive Merge algorithm stolen from git-merge-recursive.py by
* Fredrik Kuivinen.
* The thieves were Alex Riesen and Johannes Schindelin, in June/July 2006
*/
#include "cache.h"
#include "config.h"
#include "advice.h"
#include "lockfile.h"
#include "cache-tree.h"
#include "object-store.h"
#include "repository.h"
#include "commit.h"
#include "blob.h"
#include "builtin.h"
#include "tree-walk.h"
#include "diff.h"
#include "diffcore.h"
#include "tag.h"
#include "alloc.h"
#include "unpack-trees.h"
#include "string-list.h"
#include "xdiff-interface.h"
#include "ll-merge.h"
#include "attr.h"
#include "merge-recursive.h"
#include "dir.h"
#include "submodule.h"
#include "revision.h"
struct path_hashmap_entry {
struct hashmap_entry e;
char path[FLEX_ARRAY];
};
static int path_hashmap_cmp(const void *cmp_data,
const void *entry,
const void *entry_or_key,
const void *keydata)
{
const struct path_hashmap_entry *a = entry;
const struct path_hashmap_entry *b = entry_or_key;
const char *key = keydata;
if (ignore_case)
return strcasecmp(a->path, key ? key : b->path);
else
return strcmp(a->path, key ? key : b->path);
}
static unsigned int path_hash(const char *path)
{
return ignore_case ? strihash(path) : strhash(path);
}
static struct dir_rename_entry *dir_rename_find_entry(struct hashmap *hashmap,
char *dir)
{
struct dir_rename_entry key;
if (dir == NULL)
return NULL;
hashmap_entry_init(&key, strhash(dir));
key.dir = dir;
return hashmap_get(hashmap, &key, NULL);
}
static int dir_rename_cmp(const void *unused_cmp_data,
const void *entry,
const void *entry_or_key,
const void *unused_keydata)
{
const struct dir_rename_entry *e1 = entry;
const struct dir_rename_entry *e2 = entry_or_key;
return strcmp(e1->dir, e2->dir);
}
static void dir_rename_init(struct hashmap *map)
{
hashmap_init(map, dir_rename_cmp, NULL, 0);
}
static void dir_rename_entry_init(struct dir_rename_entry *entry,
char *directory)
{
hashmap_entry_init(entry, strhash(directory));
entry->dir = directory;
entry->non_unique_new_dir = 0;
strbuf_init(&entry->new_dir, 0);
string_list_init(&entry->possible_new_dirs, 0);
}
static struct collision_entry *collision_find_entry(struct hashmap *hashmap,
char *target_file)
{
struct collision_entry key;
hashmap_entry_init(&key, strhash(target_file));
key.target_file = target_file;
return hashmap_get(hashmap, &key, NULL);
}
static int collision_cmp(void *unused_cmp_data,
const struct collision_entry *e1,
const struct collision_entry *e2,
const void *unused_keydata)
{
return strcmp(e1->target_file, e2->target_file);
}
static void collision_init(struct hashmap *map)
{
hashmap_init(map, (hashmap_cmp_fn) collision_cmp, NULL, 0);
}
static void flush_output(struct merge_options *o)
{
if (o->buffer_output < 2 && o->obuf.len) {
fputs(o->obuf.buf, stdout);
strbuf_reset(&o->obuf);
}
}
static int err(struct merge_options *o, const char *err, ...)
{
va_list params;
if (o->buffer_output < 2)
flush_output(o);
else {
strbuf_complete(&o->obuf, '\n');
strbuf_addstr(&o->obuf, "error: ");
}
va_start(params, err);
strbuf_vaddf(&o->obuf, err, params);
va_end(params);
if (o->buffer_output > 1)
strbuf_addch(&o->obuf, '\n');
else {
error("%s", o->obuf.buf);
strbuf_reset(&o->obuf);
}
return -1;
}
static struct tree *shift_tree_object(struct tree *one, struct tree *two,
const char *subtree_shift)
{
struct object_id shifted;
if (!*subtree_shift) {
shift_tree(&one->object.oid, &two->object.oid, &shifted, 0);
} else {
shift_tree_by(&one->object.oid, &two->object.oid, &shifted,
subtree_shift);
}
if (!oidcmp(&two->object.oid, &shifted))
return two;
return lookup_tree(the_repository, &shifted);
}
static struct commit *make_virtual_commit(struct tree *tree, const char *comment)
{
struct commit *commit = alloc_commit_node(the_repository);
set_merge_remote_desc(commit, comment, (struct object *)commit);
commit->maybe_tree = tree;
commit->object.parsed = 1;
return commit;
}
/*
* Since we use get_tree_entry(), which does not put the read object into
* the object pool, we cannot rely on a == b.
*/
static int oid_eq(const struct object_id *a, const struct object_id *b)
{
if (!a && !b)
return 2;
return a && b && oidcmp(a, b) == 0;
}
enum rename_type {
RENAME_NORMAL = 0,
RENAME_DIR,
RENAME_DELETE,
RENAME_ONE_FILE_TO_ONE,
RENAME_ONE_FILE_TO_TWO,
RENAME_TWO_FILES_TO_ONE
};
struct rename_conflict_info {
enum rename_type rename_type;
struct diff_filepair *pair1;
struct diff_filepair *pair2;
const char *branch1;
const char *branch2;
struct stage_data *dst_entry1;
struct stage_data *dst_entry2;
struct diff_filespec ren1_other;
struct diff_filespec ren2_other;
};
/*
* Since we want to write the index eventually, we cannot reuse the index
* for these (temporary) data.
*/
struct stage_data {
struct {
unsigned mode;
struct object_id oid;
} stages[4];
struct rename_conflict_info *rename_conflict_info;
unsigned processed:1;
};
static inline void setup_rename_conflict_info(enum rename_type rename_type,
struct diff_filepair *pair1,
struct diff_filepair *pair2,
const char *branch1,
const char *branch2,
struct stage_data *dst_entry1,
struct stage_data *dst_entry2,
struct merge_options *o,
struct stage_data *src_entry1,
struct stage_data *src_entry2)
{
struct rename_conflict_info *ci = xcalloc(1, sizeof(struct rename_conflict_info));
ci->rename_type = rename_type;
ci->pair1 = pair1;
ci->branch1 = branch1;
ci->branch2 = branch2;
ci->dst_entry1 = dst_entry1;
dst_entry1->rename_conflict_info = ci;
dst_entry1->processed = 0;
assert(!pair2 == !dst_entry2);
if (dst_entry2) {
ci->dst_entry2 = dst_entry2;
ci->pair2 = pair2;
dst_entry2->rename_conflict_info = ci;
}
if (rename_type == RENAME_TWO_FILES_TO_ONE) {
/*
* For each rename, there could have been
* modifications on the side of history where that
* file was not renamed.
*/
int ostage1 = o->branch1 == branch1 ? 3 : 2;
int ostage2 = ostage1 ^ 1;
ci->ren1_other.path = pair1->one->path;
oidcpy(&ci->ren1_other.oid, &src_entry1->stages[ostage1].oid);
ci->ren1_other.mode = src_entry1->stages[ostage1].mode;
ci->ren2_other.path = pair2->one->path;
oidcpy(&ci->ren2_other.oid, &src_entry2->stages[ostage2].oid);
ci->ren2_other.mode = src_entry2->stages[ostage2].mode;
}
}
static int show(struct merge_options *o, int v)
{
return (!o->call_depth && o->verbosity >= v) || o->verbosity >= 5;
}
__attribute__((format (printf, 3, 4)))
static void output(struct merge_options *o, int v, const char *fmt, ...)
{
va_list ap;
if (!show(o, v))
return;
strbuf_addchars(&o->obuf, ' ', o->call_depth * 2);
va_start(ap, fmt);
strbuf_vaddf(&o->obuf, fmt, ap);
va_end(ap);
strbuf_addch(&o->obuf, '\n');
if (!o->buffer_output)
flush_output(o);
}
static void output_commit_title(struct merge_options *o, struct commit *commit)
{
struct merge_remote_desc *desc;
strbuf_addchars(&o->obuf, ' ', o->call_depth * 2);
desc = merge_remote_util(commit);
if (desc)
strbuf_addf(&o->obuf, "virtual %s\n", desc->name);
else {
strbuf_add_unique_abbrev(&o->obuf, &commit->object.oid,
DEFAULT_ABBREV);
strbuf_addch(&o->obuf, ' ');
if (parse_commit(commit) != 0)
strbuf_addstr(&o->obuf, _("(bad commit)\n"));
else {
const char *title;
const char *msg = get_commit_buffer(commit, NULL);
int len = find_commit_subject(msg, &title);
if (len)
strbuf_addf(&o->obuf, "%.*s\n", len, title);
unuse_commit_buffer(commit, msg);
}
}
flush_output(o);
}
static int add_cacheinfo(struct merge_options *o,
unsigned int mode, const struct object_id *oid,
const char *path, int stage, int refresh, int options)
{
struct cache_entry *ce;
int ret;
ce = make_cache_entry(mode, oid ? oid->hash : null_sha1, path, stage, 0);
if (!ce)
return err(o, _("add_cacheinfo failed for path '%s'; merge aborting."), path);
ret = add_cache_entry(ce, options);
if (refresh) {
struct cache_entry *nce;
nce = refresh_cache_entry(ce, CE_MATCH_REFRESH | CE_MATCH_IGNORE_MISSING);
if (!nce)
return err(o, _("add_cacheinfo failed to refresh for path '%s'; merge aborting."), path);
if (nce != ce)
ret = add_cache_entry(nce, options);
}
return ret;
}
static void init_tree_desc_from_tree(struct tree_desc *desc, struct tree *tree)
{
parse_tree(tree);
init_tree_desc(desc, tree->buffer, tree->size);
}
static int unpack_trees_start(struct merge_options *o,
struct tree *common,
struct tree *head,
struct tree *merge)
{
int rc;
struct tree_desc t[3];
struct index_state tmp_index = { NULL };
memset(&o->unpack_opts, 0, sizeof(o->unpack_opts));
if (o->call_depth)
o->unpack_opts.index_only = 1;
else
o->unpack_opts.update = 1;
o->unpack_opts.merge = 1;
o->unpack_opts.head_idx = 2;
o->unpack_opts.fn = threeway_merge;
o->unpack_opts.src_index = &the_index;
o->unpack_opts.dst_index = &tmp_index;
o->unpack_opts.aggressive = !merge_detect_rename(o);
setup_unpack_trees_porcelain(&o->unpack_opts, "merge");
init_tree_desc_from_tree(t+0, common);
init_tree_desc_from_tree(t+1, head);
init_tree_desc_from_tree(t+2, merge);
rc = unpack_trees(3, t, &o->unpack_opts);
cache_tree_free(&active_cache_tree);
/*
* Update the_index to match the new results, AFTER saving a copy
* in o->orig_index. Update src_index to point to the saved copy.
* (verify_uptodate() checks src_index, and the original index is
* the one that had the necessary modification timestamps.)
*/
o->orig_index = the_index;
the_index = tmp_index;
o->unpack_opts.src_index = &o->orig_index;
return rc;
}
static void unpack_trees_finish(struct merge_options *o)
{
discard_index(&o->orig_index);
clear_unpack_trees_porcelain(&o->unpack_opts);
}
struct tree *write_tree_from_memory(struct merge_options *o)
{
struct tree *result = NULL;
if (unmerged_cache()) {
int i;
fprintf(stderr, "BUG: There are unmerged index entries:\n");
for (i = 0; i < active_nr; i++) {
const struct cache_entry *ce = active_cache[i];
if (ce_stage(ce))
fprintf(stderr, "BUG: %d %.*s\n", ce_stage(ce),
(int)ce_namelen(ce), ce->name);
}
BUG("unmerged index entries in merge-recursive.c");
}
if (!active_cache_tree)
active_cache_tree = cache_tree();
if (!cache_tree_fully_valid(active_cache_tree) &&
cache_tree_update(&the_index, 0) < 0) {
err(o, _("error building trees"));
return NULL;
}
result = lookup_tree(the_repository, &active_cache_tree->oid);
return result;
}
static int save_files_dirs(const struct object_id *oid,
struct strbuf *base, const char *path,
unsigned int mode, int stage, void *context)
{
struct path_hashmap_entry *entry;
int baselen = base->len;
struct merge_options *o = context;
strbuf_addstr(base, path);
FLEX_ALLOC_MEM(entry, path, base->buf, base->len);
hashmap_entry_init(entry, path_hash(entry->path));
hashmap_add(&o->current_file_dir_set, entry);
strbuf_setlen(base, baselen);
return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
}
static void get_files_dirs(struct merge_options *o, struct tree *tree)
{
struct pathspec match_all;
memset(&match_all, 0, sizeof(match_all));
read_tree_recursive(tree, "", 0, 0, &match_all, save_files_dirs, o);
}
static int get_tree_entry_if_blob(const struct object_id *tree,
const char *path,
struct object_id *hashy,
unsigned int *mode_o)
{
int ret;
ret = get_tree_entry(tree, path, hashy, mode_o);
if (S_ISDIR(*mode_o)) {
oidcpy(hashy, &null_oid);
*mode_o = 0;
}
return ret;
}
/*
* Returns an index_entry instance which doesn't have to correspond to
* a real cache entry in Git's index.
*/
static struct stage_data *insert_stage_data(const char *path,
struct tree *o, struct tree *a, struct tree *b,
struct string_list *entries)
{
struct string_list_item *item;
struct stage_data *e = xcalloc(1, sizeof(struct stage_data));
get_tree_entry_if_blob(&o->object.oid, path,
&e->stages[1].oid, &e->stages[1].mode);
get_tree_entry_if_blob(&a->object.oid, path,
&e->stages[2].oid, &e->stages[2].mode);
get_tree_entry_if_blob(&b->object.oid, path,
&e->stages[3].oid, &e->stages[3].mode);
item = string_list_insert(entries, path);
item->util = e;
return e;
}
/*
* Create a dictionary mapping file names to stage_data objects. The
* dictionary contains one entry for every path with a non-zero stage entry.
*/
static struct string_list *get_unmerged(void)
{
struct string_list *unmerged = xcalloc(1, sizeof(struct string_list));
int i;
unmerged->strdup_strings = 1;
for (i = 0; i < active_nr; i++) {
struct string_list_item *item;
struct stage_data *e;
const struct cache_entry *ce = active_cache[i];
if (!ce_stage(ce))
continue;
item = string_list_lookup(unmerged, ce->name);
if (!item) {
item = string_list_insert(unmerged, ce->name);
item->util = xcalloc(1, sizeof(struct stage_data));
}
e = item->util;
e->stages[ce_stage(ce)].mode = ce->ce_mode;
oidcpy(&e->stages[ce_stage(ce)].oid, &ce->oid);
}
return unmerged;
}
static int string_list_df_name_compare(const char *one, const char *two)
{
int onelen = strlen(one);
int twolen = strlen(two);
/*
* Here we only care that entries for D/F conflicts are
* adjacent, in particular with the file of the D/F conflict
* appearing before files below the corresponding directory.
* The order of the rest of the list is irrelevant for us.
*
* To achieve this, we sort with df_name_compare and provide
* the mode S_IFDIR so that D/F conflicts will sort correctly.
* We use the mode S_IFDIR for everything else for simplicity,
* since in other cases any changes in their order due to
* sorting cause no problems for us.
*/
int cmp = df_name_compare(one, onelen, S_IFDIR,
two, twolen, S_IFDIR);
/*
* Now that 'foo' and 'foo/bar' compare equal, we have to make sure
* that 'foo' comes before 'foo/bar'.
*/
if (cmp)
return cmp;
return onelen - twolen;
}
static void record_df_conflict_files(struct merge_options *o,
struct string_list *entries)
{
/* If there is a D/F conflict and the file for such a conflict
* currently exist in the working tree, we want to allow it to be
* removed to make room for the corresponding directory if needed.
* The files underneath the directories of such D/F conflicts will
* be processed before the corresponding file involved in the D/F
* conflict. If the D/F directory ends up being removed by the
* merge, then we won't have to touch the D/F file. If the D/F
* directory needs to be written to the working copy, then the D/F
* file will simply be removed (in make_room_for_path()) to make
* room for the necessary paths. Note that if both the directory
* and the file need to be present, then the D/F file will be
* reinstated with a new unique name at the time it is processed.
*/
struct string_list df_sorted_entries = STRING_LIST_INIT_NODUP;
const char *last_file = NULL;
int last_len = 0;
int i;
/*
* If we're merging merge-bases, we don't want to bother with
* any working directory changes.
*/
if (o->call_depth)
return;
/* Ensure D/F conflicts are adjacent in the entries list. */
for (i = 0; i < entries->nr; i++) {
struct string_list_item *next = &entries->items[i];
string_list_append(&df_sorted_entries, next->string)->util =
next->util;
}
df_sorted_entries.cmp = string_list_df_name_compare;
string_list_sort(&df_sorted_entries);
string_list_clear(&o->df_conflict_file_set, 1);
for (i = 0; i < df_sorted_entries.nr; i++) {
const char *path = df_sorted_entries.items[i].string;
int len = strlen(path);
struct stage_data *e = df_sorted_entries.items[i].util;
/*
* Check if last_file & path correspond to a D/F conflict;
* i.e. whether path is last_file+'/'+<something>.
* If so, record that it's okay to remove last_file to make
* room for path and friends if needed.
*/
if (last_file &&
len > last_len &&
memcmp(path, last_file, last_len) == 0 &&
path[last_len] == '/') {
string_list_insert(&o->df_conflict_file_set, last_file);
}
/*
* Determine whether path could exist as a file in the
* working directory as a possible D/F conflict. This
* will only occur when it exists in stage 2 as a
* file.
*/
if (S_ISREG(e->stages[2].mode) || S_ISLNK(e->stages[2].mode)) {
last_file = path;
last_len = len;
} else {
last_file = NULL;
}
}
string_list_clear(&df_sorted_entries, 0);
}
struct rename {
struct diff_filepair *pair;
/*
* Purpose of src_entry and dst_entry:
*
* If 'before' is renamed to 'after' then src_entry will contain
* the versions of 'before' from the merge_base, HEAD, and MERGE in
* stages 1, 2, and 3; dst_entry will contain the respective
* versions of 'after' in corresponding locations. Thus, we have a
* total of six modes and oids, though some will be null. (Stage 0
* is ignored; we're interested in handling conflicts.)
*
* Since we don't turn on break-rewrites by default, neither
* src_entry nor dst_entry can have all three of their stages have
* non-null oids, meaning at most four of the six will be non-null.
* Also, since this is a rename, both src_entry and dst_entry will
* have at least one non-null oid, meaning at least two will be
* non-null. Of the six oids, a typical rename will have three be
* non-null. Only two implies a rename/delete, and four implies a
* rename/add.
*/
struct stage_data *src_entry;
struct stage_data *dst_entry;
unsigned add_turned_into_rename:1;
unsigned processed:1;
};
static int update_stages(struct merge_options *opt, const char *path,
const struct diff_filespec *o,
const struct diff_filespec *a,
const struct diff_filespec *b)
{
/*
* NOTE: It is usually a bad idea to call update_stages on a path
* before calling update_file on that same path, since it can
* sometimes lead to spurious "refusing to lose untracked file..."
* messages from update_file (via make_room_for path via
* would_lose_untracked). Instead, reverse the order of the calls
* (executing update_file first and then update_stages).
*/
int clear = 1;
int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_SKIP_DFCHECK;
if (clear)
if (remove_file_from_cache(path))
return -1;
if (o)
if (add_cacheinfo(opt, o->mode, &o->oid, path, 1, 0, options))
return -1;
if (a)
if (add_cacheinfo(opt, a->mode, &a->oid, path, 2, 0, options))
return -1;
if (b)
if (add_cacheinfo(opt, b->mode, &b->oid, path, 3, 0, options))
return -1;
return 0;
}
static int update_stages_for_stage_data(struct merge_options *opt,
const char *path,
const struct stage_data *stage_data)
{
struct diff_filespec o, a, b;
o.mode = stage_data->stages[1].mode;
oidcpy(&o.oid, &stage_data->stages[1].oid);
a.mode = stage_data->stages[2].mode;
oidcpy(&a.oid, &stage_data->stages[2].oid);
b.mode = stage_data->stages[3].mode;
oidcpy(&b.oid, &stage_data->stages[3].oid);
return update_stages(opt, path,
is_null_oid(&o.oid) ? NULL : &o,
is_null_oid(&a.oid) ? NULL : &a,
is_null_oid(&b.oid) ? NULL : &b);
}
static void update_entry(struct stage_data *entry,
struct diff_filespec *o,
struct diff_filespec *a,
struct diff_filespec *b)
{
entry->processed = 0;
entry->stages[1].mode = o->mode;
entry->stages[2].mode = a->mode;
entry->stages[3].mode = b->mode;
oidcpy(&entry->stages[1].oid, &o->oid);
oidcpy(&entry->stages[2].oid, &a->oid);
oidcpy(&entry->stages[3].oid, &b->oid);
}
static int remove_file(struct merge_options *o, int clean,
const char *path, int no_wd)
{
int update_cache = o->call_depth || clean;
int update_working_directory = !o->call_depth && !no_wd;
if (update_cache) {
if (remove_file_from_cache(path))
return -1;
}
if (update_working_directory) {
if (ignore_case) {
struct cache_entry *ce;
ce = cache_file_exists(path, strlen(path), ignore_case);
if (ce && ce_stage(ce) == 0 && strcmp(path, ce->name))
return 0;
}
if (remove_path(path))
return -1;
}
return 0;
}
/* add a string to a strbuf, but converting "/" to "_" */
static void add_flattened_path(struct strbuf *out, const char *s)
{
size_t i = out->len;
strbuf_addstr(out, s);
for (; i < out->len; i++)
if (out->buf[i] == '/')
out->buf[i] = '_';
}
static char *unique_path(struct merge_options *o, const char *path, const char *branch)
{
struct path_hashmap_entry *entry;
struct strbuf newpath = STRBUF_INIT;
int suffix = 0;
size_t base_len;
strbuf_addf(&newpath, "%s~", path);
add_flattened_path(&newpath, branch);
base_len = newpath.len;
while (hashmap_get_from_hash(&o->current_file_dir_set,
path_hash(newpath.buf), newpath.buf) ||
(!o->call_depth && file_exists(newpath.buf))) {
strbuf_setlen(&newpath, base_len);
strbuf_addf(&newpath, "_%d", suffix++);
}
FLEX_ALLOC_MEM(entry, path, newpath.buf, newpath.len);
hashmap_entry_init(entry, path_hash(entry->path));
hashmap_add(&o->current_file_dir_set, entry);
return strbuf_detach(&newpath, NULL);
}
/**
* Check whether a directory in the index is in the way of an incoming
* file. Return 1 if so. If check_working_copy is non-zero, also
* check the working directory. If empty_ok is non-zero, also return
* 0 in the case where the working-tree dir exists but is empty.
*/
static int dir_in_way(const char *path, int check_working_copy, int empty_ok)
{
int pos;
struct strbuf dirpath = STRBUF_INIT;
struct stat st;
strbuf_addstr(&dirpath, path);
strbuf_addch(&dirpath, '/');
pos = cache_name_pos(dirpath.buf, dirpath.len);
if (pos < 0)
pos = -1 - pos;
if (pos < active_nr &&
!strncmp(dirpath.buf, active_cache[pos]->name, dirpath.len)) {
strbuf_release(&dirpath);
return 1;
}
strbuf_release(&dirpath);
return check_working_copy && !lstat(path, &st) && S_ISDIR(st.st_mode) &&
!(empty_ok && is_empty_dir(path));
}
/*
* Returns whether path was tracked in the index before the merge started,
* and its oid and mode match the specified values
*/
static int was_tracked_and_matches(struct merge_options *o, const char *path,
const struct object_id *oid, unsigned mode)
{
int pos = index_name_pos(&o->orig_index, path, strlen(path));
struct cache_entry *ce;
if (0 > pos)
/* we were not tracking this path before the merge */
return 0;
/* See if the file we were tracking before matches */
ce = o->orig_index.cache[pos];
return (oid_eq(&ce->oid, oid) && ce->ce_mode == mode);
}
/*
* Returns whether path was tracked in the index before the merge started
*/
static int was_tracked(struct merge_options *o, const char *path)
{
int pos = index_name_pos(&o->orig_index, path, strlen(path));
if (0 <= pos)
/* we were tracking this path before the merge */
return 1;
return 0;
}
static int would_lose_untracked(const char *path)
{
/*
* This may look like it can be simplified to:
* return !was_tracked(o, path) && file_exists(path)
* but it can't. This function needs to know whether path was in
* the working tree due to EITHER having been tracked in the index
* before the merge OR having been put into the working copy and
* index by unpack_trees(). Due to that either-or requirement, we
* check the current index instead of the original one.
*
* Note that we do not need to worry about merge-recursive itself
* updating the index after unpack_trees() and before calling this
* function, because we strictly require all code paths in
* merge-recursive to update the working tree first and the index
* second. Doing otherwise would break
* update_file()/would_lose_untracked(); see every comment in this
* file which mentions "update_stages".
*/
int pos = cache_name_pos(path, strlen(path));
if (pos < 0)
pos = -1 - pos;
while (pos < active_nr &&
!strcmp(path, active_cache[pos]->name)) {
/*
* If stage #0, it is definitely tracked.
* If it has stage #2 then it was tracked
* before this merge started. All other
* cases the path was not tracked.
*/
switch (ce_stage(active_cache[pos])) {
case 0:
case 2:
return 0;
}
pos++;
}
return file_exists(path);
}
static int was_dirty(struct merge_options *o, const char *path)
{
struct cache_entry *ce;
int dirty = 1;
if (o->call_depth || !was_tracked(o, path))
return !dirty;
ce = index_file_exists(o->unpack_opts.src_index,
path, strlen(path), ignore_case);
dirty = verify_uptodate(ce, &o->unpack_opts) != 0;
return dirty;
}
static int make_room_for_path(struct merge_options *o, const char *path)
{
int status, i;
const char *msg = _("failed to create path '%s'%s");
/* Unlink any D/F conflict files that are in the way */
for (i = 0; i < o->df_conflict_file_set.nr; i++) {
const char *df_path = o->df_conflict_file_set.items[i].string;
size_t pathlen = strlen(path);
size_t df_pathlen = strlen(df_path);
if (df_pathlen < pathlen &&
path[df_pathlen] == '/' &&
strncmp(path, df_path, df_pathlen) == 0) {
output(o, 3,
_("Removing %s to make room for subdirectory\n"),
df_path);
unlink(df_path);
unsorted_string_list_delete_item(&o->df_conflict_file_set,
i, 0);
break;
}
}
/* Make sure leading directories are created */
status = safe_create_leading_directories_const(path);
if (status) {
if (status == SCLD_EXISTS)
/* something else exists */
return err(o, msg, path, _(": perhaps a D/F conflict?"));
return err(o, msg, path, "");
}
/*
* Do not unlink a file in the work tree if we are not
* tracking it.
*/
if (would_lose_untracked(path))
return err(o, _("refusing to lose untracked file at '%s'"),
path);
/* Successful unlink is good.. */
if (!unlink(path))
return 0;
/* .. and so is no existing file */
if (errno == ENOENT)
return 0;
/* .. but not some other error (who really cares what?) */
return err(o, msg, path, _(": perhaps a D/F conflict?"));
}
static int update_file_flags(struct merge_options *o,
const struct object_id *oid,
unsigned mode,
const char *path,
int update_cache,
int update_wd)
{
int ret = 0;
if (o->call_depth)
update_wd = 0;
if (update_wd) {
enum object_type type;
void *buf;
unsigned long size;
if (S_ISGITLINK(mode)) {
/*
* We may later decide to recursively descend into
* the submodule directory and update its index
* and/or work tree, but we do not do that now.
*/
update_wd = 0;
goto update_index;
}
buf = read_object_file(oid, &type, &size);
if (!buf)
return err(o, _("cannot read object %s '%s'"), oid_to_hex(oid), path);
if (type != OBJ_BLOB) {
ret = err(o, _("blob expected for %s '%s'"), oid_to_hex(oid), path);
goto free_buf;
}
if (S_ISREG(mode)) {
struct strbuf strbuf = STRBUF_INIT;
if (convert_to_working_tree(path, buf, size, &strbuf)) {
free(buf);
size = strbuf.len;
buf = strbuf_detach(&strbuf, NULL);
}
}
if (make_room_for_path(o, path) < 0) {
update_wd = 0;
goto free_buf;
}
if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) {
int fd;
if (mode & 0100)
mode = 0777;
else
mode = 0666;
fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
if (fd < 0) {
ret = err(o, _("failed to open '%s': %s"),
path, strerror(errno));
goto free_buf;
}
write_in_full(fd, buf, size);
close(fd);
} else if (S_ISLNK(mode)) {
char *lnk = xmemdupz(buf, size);
safe_create_leading_directories_const(path);
unlink(path);
if (symlink(lnk, path))
ret = err(o, _("failed to symlink '%s': %s"),
path, strerror(errno));
free(lnk);
} else
ret = err(o,
_("do not know what to do with %06o %s '%s'"),
mode, oid_to_hex(oid), path);
free_buf:
free(buf);
}
update_index:
if (!ret && update_cache)
if (add_cacheinfo(o, mode, oid, path, 0, update_wd,
ADD_CACHE_OK_TO_ADD))
return -1;
return ret;
}
static int update_file(struct merge_options *o,
int clean,
const struct object_id *oid,
unsigned mode,
const char *path)
{
return update_file_flags(o, oid, mode, path, o->call_depth || clean, !o->call_depth);
}
/* Low level file merging, update and removal */
struct merge_file_info {
struct object_id oid;
unsigned mode;
unsigned clean:1,
merge:1;
};
static int merge_3way(struct merge_options *o,
mmbuffer_t *result_buf,
const struct diff_filespec *one,
const struct diff_filespec *a,
const struct diff_filespec *b,
const char *branch1,
const char *branch2)
{
mmfile_t orig, src1, src2;
struct ll_merge_options ll_opts = {0};
char *base_name, *name1, *name2;
int merge_status;
ll_opts.renormalize = o->renormalize;
ll_opts.xdl_opts = o->xdl_opts;
if (o->call_depth) {
ll_opts.virtual_ancestor = 1;
ll_opts.variant = 0;
} else {
switch (o->recursive_variant) {
case MERGE_RECURSIVE_OURS:
ll_opts.variant = XDL_MERGE_FAVOR_OURS;
break;
case MERGE_RECURSIVE_THEIRS:
ll_opts.variant = XDL_MERGE_FAVOR_THEIRS;
break;
default:
ll_opts.variant = 0;
break;
}
}
if (strcmp(a->path, b->path) ||
(o->ancestor != NULL && strcmp(a->path, one->path) != 0)) {
base_name = o->ancestor == NULL ? NULL :
mkpathdup("%s:%s", o->ancestor, one->path);
name1 = mkpathdup("%s:%s", branch1, a->path);
name2 = mkpathdup("%s:%s", branch2, b->path);
} else {
base_name = o->ancestor == NULL ? NULL :
mkpathdup("%s", o->ancestor);
name1 = mkpathdup("%s", branch1);
name2 = mkpathdup("%s", branch2);
}
read_mmblob(&orig, &one->oid);
read_mmblob(&src1, &a->oid);
read_mmblob(&src2, &b->oid);
merge_status = ll_merge(result_buf, a->path, &orig, base_name,
&src1, name1, &src2, name2, &ll_opts);
free(base_name);
free(name1);
free(name2);
free(orig.ptr);
free(src1.ptr);
free(src2.ptr);
return merge_status;
}
static int find_first_merges(struct object_array *result, const char *path,
struct commit *a, struct commit *b)
{
int i, j;
struct object_array merges = OBJECT_ARRAY_INIT;
struct commit *commit;
int contains_another;
char merged_revision[42];
const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
"--all", merged_revision, NULL };
struct rev_info revs;
struct setup_revision_opt rev_opts;
memset(result, 0, sizeof(struct object_array));
memset(&rev_opts, 0, sizeof(rev_opts));
/* get all revisions that merge commit a */
xsnprintf(merged_revision, sizeof(merged_revision), "^%s",
oid_to_hex(&a->object.oid));
init_revisions(&revs, NULL);
rev_opts.submodule = path;
/* FIXME: can't handle linked worktrees in submodules yet */
revs.single_worktree = path != NULL;
setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
/* save all revisions from the above list that contain b */
if (prepare_revision_walk(&revs))
die("revision walk setup failed");
while ((commit = get_revision(&revs)) != NULL) {
struct object *o = &(commit->object);
if (in_merge_bases(b, commit))
add_object_array(o, NULL, &merges);
}
reset_revision_walk();
/* Now we've got all merges that contain a and b. Prune all
* merges that contain another found merge and save them in
* result.
*/
for (i = 0; i < merges.nr; i++) {
struct commit *m1 = (struct commit *) merges.objects[i].item;
contains_another = 0;
for (j = 0; j < merges.nr; j++) {
struct commit *m2 = (struct commit *) merges.objects[j].item;
if (i != j && in_merge_bases(m2, m1)) {
contains_another = 1;
break;
}
}
if (!contains_another)
add_object_array(merges.objects[i].item, NULL, result);
}
object_array_clear(&merges);
return result->nr;
}
static void print_commit(struct commit *commit)
{
struct strbuf sb = STRBUF_INIT;
struct pretty_print_context ctx = {0};
ctx.date_mode.type = DATE_NORMAL;
format_commit_message(commit, " %h: %m %s", &sb, &ctx);
fprintf(stderr, "%s\n", sb.buf);
strbuf_release(&sb);
}
static int merge_submodule(struct merge_options *o,
struct object_id *result, const char *path,
const struct object_id *base, const struct object_id *a,
const struct object_id *b)
{
struct commit *commit_base, *commit_a, *commit_b;
int parent_count;
struct object_array merges;
int i;
int search = !o->call_depth;
/* store a in result in case we fail */
oidcpy(result, a);
/* we can not handle deletion conflicts */
if (is_null_oid(base))
return 0;
if (is_null_oid(a))
return 0;
if (is_null_oid(b))
return 0;
if (add_submodule_odb(path)) {
output(o, 1, _("Failed to merge submodule %s (not checked out)"), path);
return 0;
}
if (!(commit_base = lookup_commit_reference(the_repository, base)) ||
!(commit_a = lookup_commit_reference(the_repository, a)) ||
!(commit_b = lookup_commit_reference(the_repository, b))) {
output(o, 1, _("Failed to merge submodule %s (commits not present)"), path);
return 0;
}
/* check whether both changes are forward */
if (!in_merge_bases(commit_base, commit_a) ||
!in_merge_bases(commit_base, commit_b)) {
output(o, 1, _("Failed to merge submodule %s (commits don't follow merge-base)"), path);
return 0;
}
/* Case #1: a is contained in b or vice versa */
if (in_merge_bases(commit_a, commit_b)) {
oidcpy(result, b);
if (show(o, 3)) {
output(o, 3, _("Fast-forwarding submodule %s to the following commit:"), path);
output_commit_title(o, commit_b);
} else if (show(o, 2))
output(o, 2, _("Fast-forwarding submodule %s"), path);
else
; /* no output */
return 1;
}
if (in_merge_bases(commit_b, commit_a)) {
oidcpy(result, a);
if (show(o, 3)) {
output(o, 3, _("Fast-forwarding submodule %s to the following commit:"), path);
output_commit_title(o, commit_a);
} else if (show(o, 2))
output(o, 2, _("Fast-forwarding submodule %s"), path);
else
; /* no output */
return 1;
}
/*
* Case #2: There are one or more merges that contain a and b in
* the submodule. If there is only one, then present it as a
* suggestion to the user, but leave it marked unmerged so the
* user needs to confirm the resolution.
*/
/* Skip the search if makes no sense to the calling context. */
if (!search)
return 0;
/* find commit which merges them */
parent_count = find_first_merges(&merges, path, commit_a, commit_b);
switch (parent_count) {
case 0:
output(o, 1, _("Failed to merge submodule %s (merge following commits not found)"), path);
break;
case 1:
output(o, 1, _("Failed to merge submodule %s (not fast-forward)"), path);
output(o, 2, _("Found a possible merge resolution for the submodule:\n"));
print_commit((struct commit *) merges.objects[0].item);
output(o, 2, _(
"If this is correct simply add it to the index "
"for example\n"
"by using:\n\n"
" git update-index --cacheinfo 160000 %s \"%s\"\n\n"
"which will accept this suggestion.\n"),
oid_to_hex(&merges.objects[0].item->oid), path);
break;
default:
output(o, 1, _("Failed to merge submodule %s (multiple merges found)"), path);
for (i = 0; i < merges.nr; i++)
print_commit((struct commit *) merges.objects[i].item);
}
object_array_clear(&merges);
return 0;
}
static int merge_file_1(struct merge_options *o,
const struct diff_filespec *one,
const struct diff_filespec *a,
const struct diff_filespec *b,
const char *filename,
const char *branch1,
const char *branch2,
struct merge_file_info *result)
{
result->merge = 0;
result->clean = 1;
if ((S_IFMT & a->mode) != (S_IFMT & b->mode)) {
result->clean = 0;
if (S_ISREG(a->mode)) {
result->mode = a->mode;
oidcpy(&result->oid, &a->oid);
} else {
result->mode = b->mode;
oidcpy(&result->oid, &b->oid);
}
} else {
if (!oid_eq(&a->oid, &one->oid) && !oid_eq(&b->oid, &one->oid))
result->merge = 1;
/*
* Merge modes
*/
if (a->mode == b->mode || a->mode == one->mode)
result->mode = b->mode;
else {
result->mode = a->mode;
if (b->mode != one->mode) {
result->clean = 0;
result->merge = 1;
}
}
if (oid_eq(&a->oid, &b->oid) || oid_eq(&a->oid, &one->oid))
oidcpy(&result->oid, &b->oid);
else if (oid_eq(&b->oid, &one->oid))
oidcpy(&result->oid, &a->oid);
else if (S_ISREG(a->mode)) {
mmbuffer_t result_buf;
int ret = 0, merge_status;
merge_status = merge_3way(o, &result_buf, one, a, b,
branch1, branch2);
if ((merge_status < 0) || !result_buf.ptr)
ret = err(o, _("Failed to execute internal merge"));
if (!ret &&
write_object_file(result_buf.ptr, result_buf.size,
blob_type, &result->oid))
ret = err(o, _("Unable to add %s to database"),
a->path);
free(result_buf.ptr);
if (ret)
return ret;
result->clean = (merge_status == 0);
} else if (S_ISGITLINK(a->mode)) {
result->clean = merge_submodule(o, &result->oid,
one->path,
&one->oid,
&a->oid,
&b->oid);
} else if (S_ISLNK(a->mode)) {
switch (o->recursive_variant) {
case MERGE_RECURSIVE_NORMAL:
oidcpy(&result->oid, &a->oid);
if (!oid_eq(&a->oid, &b->oid))
result->clean = 0;
break;
case MERGE_RECURSIVE_OURS:
oidcpy(&result->oid, &a->oid);
break;
case MERGE_RECURSIVE_THEIRS:
oidcpy(&result->oid, &b->oid);
break;
}
} else
BUG("unsupported object type in the tree");
}
if (result->merge)
output(o, 2, _("Auto-merging %s"), filename);
return 0;
}
static int merge_file_special_markers(struct merge_options *o,
const struct diff_filespec *one,
const struct diff_filespec *a,
const struct diff_filespec *b,
const char *target_filename,
const char *branch1,
const char *filename1,
const char *branch2,
const char *filename2,
struct merge_file_info *mfi)
{
char *side1 = NULL;
char *side2 = NULL;
int ret;
if (filename1)
side1 = xstrfmt("%s:%s", branch1, filename1);
if (filename2)
side2 = xstrfmt("%s:%s", branch2, filename2);
ret = merge_file_1(o, one, a, b, target_filename,
side1 ? side1 : branch1,
side2 ? side2 : branch2, mfi);
free(side1);
free(side2);
return ret;
}
static int merge_file_one(struct merge_options *o,
const char *path,
const struct object_id *o_oid, int o_mode,
const struct object_id *a_oid, int a_mode,
const struct object_id *b_oid, int b_mode,
const char *branch1,
const char *branch2,
struct merge_file_info *mfi)
{
struct diff_filespec one, a, b;
one.path = a.path = b.path = (char *)path;
oidcpy(&one.oid, o_oid);
one.mode = o_mode;
oidcpy(&a.oid, a_oid);
a.mode = a_mode;
oidcpy(&b.oid, b_oid);
b.mode = b_mode;
return merge_file_1(o, &one, &a, &b, path, branch1, branch2, mfi);
}
static int conflict_rename_dir(struct merge_options *o,
struct diff_filepair *pair,
const char *rename_branch,
const char *other_branch)
{
const struct diff_filespec *dest = pair->two;
if (!o->call_depth && would_lose_untracked(dest->path)) {
char *alt_path = unique_path(o, dest->path, rename_branch);
output(o, 1, _("Error: Refusing to lose untracked file at %s; "
"writing to %s instead."),
dest->path, alt_path);
/*
* Write the file in worktree at alt_path, but not in the
* index. Instead, write to dest->path for the index but
* only at the higher appropriate stage.
*/
if (update_file(o, 0, &dest->oid, dest->mode, alt_path))
return -1;
free(alt_path);
return update_stages(o, dest->path, NULL,
rename_branch == o->branch1 ? dest : NULL,
rename_branch == o->branch1 ? NULL : dest);
}
/* Update dest->path both in index and in worktree */
if (update_file(o, 1, &dest->oid, dest->mode, dest->path))
return -1;
return 0;
}
static int handle_change_delete(struct merge_options *o,
const char *path, const char *old_path,
const struct object_id *o_oid, int o_mode,
const struct object_id *changed_oid,
int changed_mode,
const char *change_branch,
const char *delete_branch,
const char *change, const char *change_past)
{
char *alt_path = NULL;
const char *update_path = path;
int ret = 0;
if (dir_in_way(path, !o->call_depth, 0) ||
(!o->call_depth && would_lose_untracked(path))) {
update_path = alt_path = unique_path(o, path, change_branch);
}
if (o->call_depth) {
/*
* We cannot arbitrarily accept either a_sha or b_sha as
* correct; since there is no true "middle point" between
* them, simply reuse the base version for virtual merge base.
*/
ret = remove_file_from_cache(path);
if (!ret)
ret = update_file(o, 0, o_oid, o_mode, update_path);
} else {
if (!alt_path) {
if (!old_path) {
output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
"and %s in %s. Version %s of %s left in tree."),
change, path, delete_branch, change_past,
change_branch, change_branch, path);
} else {
output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
"and %s to %s in %s. Version %s of %s left in tree."),
change, old_path, delete_branch, change_past, path,
change_branch, change_branch, path);
}
} else {
if (!old_path) {
output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
"and %s in %s. Version %s of %s left in tree at %s."),
change, path, delete_branch, change_past,
change_branch, change_branch, path, alt_path);
} else {
output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
"and %s to %s in %s. Version %s of %s left in tree at %s."),
change, old_path, delete_branch, change_past, path,
change_branch, change_branch, path, alt_path);
}
}
/*
* No need to call update_file() on path when change_branch ==
* o->branch1 && !alt_path, since that would needlessly touch
* path. We could call update_file_flags() with update_cache=0
* and update_wd=0, but that's a no-op.
*/
if (change_branch != o->branch1 || alt_path)
ret = update_file(o, 0, changed_oid, changed_mode, update_path);
}
free(alt_path);
return ret;
}
static int conflict_rename_delete(struct merge_options *o,
struct diff_filepair *pair,
const char *rename_branch,
const char *delete_branch)
{
const struct diff_filespec *orig = pair->one;
const struct diff_filespec *dest = pair->two;
if (handle_change_delete(o,
o->call_depth ? orig->path : dest->path,
o->call_depth ? NULL : orig->path,
&orig->oid, orig->mode,
&dest->oid, dest->mode,
rename_branch, delete_branch,
_("rename"), _("renamed")))
return -1;
if (o->call_depth)
return remove_file_from_cache(dest->path);
else
return update_stages(o, dest->path, NULL,
rename_branch == o->branch1 ? dest : NULL,
rename_branch == o->branch1 ? NULL : dest);
}
static struct diff_filespec *filespec_from_entry(struct diff_filespec *target,
struct stage_data *entry,
int stage)
{
struct object_id *oid = &entry->stages[stage].oid;
unsigned mode = entry->stages[stage].mode;
if (mode == 0 || is_null_oid(oid))
return NULL;
oidcpy(&target->oid, oid);
target->mode = mode;
return target;
}
static int handle_file(struct merge_options *o,
struct diff_filespec *rename,
int stage,
struct rename_conflict_info *ci)
{
char *dst_name = rename->path;
struct stage_data *dst_entry;
const char *cur_branch, *other_branch;
struct diff_filespec other;
struct diff_filespec *add;
int ret;
if (stage == 2) {
dst_entry = ci->dst_entry1;
cur_branch = ci->branch1;
other_branch = ci->branch2;
} else {
dst_entry = ci->dst_entry2;
cur_branch = ci->branch2;
other_branch = ci->branch1;
}
add = filespec_from_entry(&other, dst_entry, stage ^ 1);
if (add) {
int ren_src_was_dirty = was_dirty(o, rename->path);
char *add_name = unique_path(o, rename->path, other_branch);
if (update_file(o, 0, &add->oid, add->mode, add_name))
return -1;
if (ren_src_was_dirty) {
output(o, 1, _("Refusing to lose dirty file at %s"),
rename->path);
}
/*
* Because the double negatives somehow keep confusing me...
* 1) update_wd iff !ren_src_was_dirty.
* 2) no_wd iff !update_wd
* 3) so, no_wd == !!ren_src_was_dirty == ren_src_was_dirty
*/
remove_file(o, 0, rename->path, ren_src_was_dirty);
dst_name = unique_path(o, rename->path, cur_branch);
} else {
if (dir_in_way(rename->path, !o->call_depth, 0)) {
dst_name = unique_path(o, rename->path, cur_branch);
output(o, 1, _("%s is a directory in %s adding as %s instead"),
rename->path, other_branch, dst_name);
} else if (!o->call_depth &&
would_lose_untracked(rename->path)) {
dst_name = unique_path(o, rename->path, cur_branch);
output(o, 1, _("Refusing to lose untracked file at %s; "
"adding as %s instead"),
rename->path, dst_name);
}
}
if ((ret = update_file(o, 0, &rename->oid, rename->mode, dst_name)))
; /* fall through, do allow dst_name to be released */
else if (stage == 2)
ret = update_stages(o, rename->path, NULL, rename, add);
else
ret = update_stages(o, rename->path, NULL, add, rename);
if (dst_name != rename->path)
free(dst_name);
return ret;
}
static int conflict_rename_rename_1to2(struct merge_options *o,
struct rename_conflict_info *ci)
{
/* One file was renamed in both branches, but to different names. */
struct diff_filespec *one = ci->pair1->one;
struct diff_filespec *a = ci->pair1->two;
struct diff_filespec *b = ci->pair2->two;
output(o, 1, _("CONFLICT (rename/rename): "
"Rename \"%s\"->\"%s\" in branch \"%s\" "
"rename \"%s\"->\"%s\" in \"%s\"%s"),
one->path, a->path, ci->branch1,
one->path, b->path, ci->branch2,
o->call_depth ? _(" (left unresolved)") : "");
if (o->call_depth) {
struct merge_file_info mfi;
struct diff_filespec other;
struct diff_filespec *add;
if (merge_file_one(o, one->path,
&one->oid, one->mode,
&a->oid, a->mode,
&b->oid, b->mode,
ci->branch1, ci->branch2, &mfi))
return -1;
/*
* FIXME: For rename/add-source conflicts (if we could detect
* such), this is wrong. We should instead find a unique
* pathname and then either rename the add-source file to that
* unique path, or use that unique path instead of src here.
*/
if (update_file(o, 0, &mfi.oid, mfi.mode, one->path))
return -1;
/*
* Above, we put the merged content at the merge-base's
* path. Now we usually need to delete both a->path and
* b->path. However, the rename on each side of the merge
* could also be involved in a rename/add conflict. In
* such cases, we should keep the added file around,
* resolving the conflict at that path in its favor.
*/
add = filespec_from_entry(&other, ci->dst_entry1, 2 ^ 1);
if (add) {
if (update_file(o, 0, &add->oid, add->mode, a->path))
return -1;
}
else
remove_file_from_cache(a->path);
add = filespec_from_entry(&other, ci->dst_entry2, 3 ^ 1);
if (add) {
if (update_file(o, 0, &add->oid, add->mode, b->path))
return -1;
}
else
remove_file_from_cache(b->path);
} else if (handle_file(o, a, 2, ci) || handle_file(o, b, 3, ci))
return -1;
return 0;
}
static int conflict_rename_rename_2to1(struct merge_options *o,
struct rename_conflict_info *ci)
{
/* Two files, a & b, were renamed to the same thing, c. */
struct diff_filespec *a = ci->pair1->one;
struct diff_filespec *b = ci->pair2->one;
struct diff_filespec *c1 = ci->pair1->two;
struct diff_filespec *c2 = ci->pair2->two;
char *path = c1->path; /* == c2->path */
char *path_side_1_desc;
char *path_side_2_desc;
struct merge_file_info mfi_c1;
struct merge_file_info mfi_c2;
int ret;
output(o, 1, _("CONFLICT (rename/rename): "
"Rename %s->%s in %s. "
"Rename %s->%s in %s"),
a->path, c1->path, ci->branch1,
b->path, c2->path, ci->branch2);
remove_file(o, 1, a->path, o->call_depth || would_lose_untracked(a->path));
remove_file(o, 1, b->path, o->call_depth || would_lose_untracked(b->path));
path_side_1_desc = xstrfmt("%s (was %s)", path, a->path);
path_side_2_desc = xstrfmt("%s (was %s)", path, b->path);
if (merge_file_special_markers(o, a, c1, &ci->ren1_other,
path_side_1_desc,
o->branch1, c1->path,
o->branch2, ci->ren1_other.path, &mfi_c1) ||
merge_file_special_markers(o, b, &ci->ren2_other, c2,
path_side_2_desc,
o->branch1, ci->ren2_other.path,
o->branch2, c2->path, &mfi_c2))
return -1;
free(path_side_1_desc);
free(path_side_2_desc);
if (o->call_depth) {
/*
* If mfi_c1.clean && mfi_c2.clean, then it might make
* sense to do a two-way merge of those results. But, I
* think in all cases, it makes sense to have the virtual
* merge base just undo the renames; they can be detected
* again later for the non-recursive merge.
*/
remove_file(o, 0, path, 0);
ret = update_file(o, 0, &mfi_c1.oid, mfi_c1.mode, a->path);
if (!ret)
ret = update_file(o, 0, &mfi_c2.oid, mfi_c2.mode,
b->path);
} else {
char *new_path1 = unique_path(o, path, ci->branch1);
char *new_path2 = unique_path(o, path, ci->branch2);
output(o, 1, _("Renaming %s to %s and %s to %s instead"),
a->path, new_path1, b->path, new_path2);
if (was_dirty(o, path))
output(o, 1, _("Refusing to lose dirty file at %s"),
path);
else if (would_lose_untracked(path))
/*
* Only way we get here is if both renames were from
* a directory rename AND user had an untracked file
* at the location where both files end up after the
* two directory renames. See testcase 10d of t6043.
*/
output(o, 1, _("Refusing to lose untracked file at "
"%s, even though it's in the way."),
path);
else
remove_file(o, 0, path, 0);
ret = update_file(o, 0, &mfi_c1.oid, mfi_c1.mode, new_path1);
if (!ret)
ret = update_file(o, 0, &mfi_c2.oid, mfi_c2.mode,
new_path2);
/*
* unpack_trees() actually populates the index for us for
* "normal" rename/rename(2to1) situtations so that the
* correct entries are at the higher stages, which would
* make the call below to update_stages_for_stage_data
* unnecessary. However, if either of the renames came
* from a directory rename, then unpack_trees() will not
* have gotten the right data loaded into the index, so we
* need to do so now. (While it'd be tempting to move this
* call to update_stages_for_stage_data() to
* apply_directory_rename_modifications(), that would break
* our intermediate calls to would_lose_untracked() since
* those rely on the current in-memory index. See also the
* big "NOTE" in update_stages()).
*/
if (update_stages_for_stage_data(o, path, ci->dst_entry1))
ret = -1;
free(new_path2);
free(new_path1);
}
return ret;
}
/*
* Get the diff_filepairs changed between o_tree and tree.
*/
static struct diff_queue_struct *get_diffpairs(struct merge_options *o,
struct tree *o_tree,
struct tree *tree)
{
struct diff_queue_struct *ret;
struct diff_options opts;
diff_setup(&opts);
opts.flags.recursive = 1;
opts.flags.rename_empty = 0;
opts.detect_rename = merge_detect_rename(o);
/*
* We do not have logic to handle the detection of copies. In
* fact, it may not even make sense to add such logic: would we
* really want a change to a base file to be propagated through
* multiple other files by a merge?
*/
if (opts.detect_rename > DIFF_DETECT_RENAME)
opts.detect_rename = DIFF_DETECT_RENAME;
opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit :
o->diff_rename_limit >= 0 ? o->diff_rename_limit :
1000;
opts.rename_score = o->rename_score;
opts.show_rename_progress = o->show_rename_progress;
opts.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_setup_done(&opts);
diff_tree_oid(&o_tree->object.oid, &tree->object.oid, "", &opts);
diffcore_std(&opts);
if (opts.needed_rename_limit > o->needed_rename_limit)
o->needed_rename_limit = opts.needed_rename_limit;
ret = xmalloc(sizeof(*ret));
*ret = diff_queued_diff;
opts.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_queued_diff.nr = 0;
diff_queued_diff.queue = NULL;
diff_flush(&opts);
return ret;
}
static int tree_has_path(struct tree *tree, const char *path)
{
struct object_id hashy;
unsigned int mode_o;
return !get_tree_entry(&tree->object.oid, path,
&hashy, &mode_o);
}
/*
* Return a new string that replaces the beginning portion (which matches
* entry->dir), with entry->new_dir. In perl-speak:
* new_path_name = (old_path =~ s/entry->dir/entry->new_dir/);
* NOTE:
* Caller must ensure that old_path starts with entry->dir + '/'.
*/
static char *apply_dir_rename(struct dir_rename_entry *entry,
const char *old_path)
{
struct strbuf new_path = STRBUF_INIT;
int oldlen, newlen;
if (entry->non_unique_new_dir)
return NULL;
oldlen = strlen(entry->dir);
newlen = entry->new_dir.len + (strlen(old_path) - oldlen) + 1;
strbuf_grow(&new_path, newlen);
strbuf_addbuf(&new_path, &entry->new_dir);
strbuf_addstr(&new_path, &old_path[oldlen]);
return strbuf_detach(&new_path, NULL);
}
static void get_renamed_dir_portion(const char *old_path, const char *new_path,
char **old_dir, char **new_dir)
{
char *end_of_old, *end_of_new;
int old_len, new_len;
*old_dir = NULL;
*new_dir = NULL;
/*
* For
* "a/b/c/d/e/foo.c" -> "a/b/some/thing/else/e/foo.c"
* the "e/foo.c" part is the same, we just want to know that
* "a/b/c/d" was renamed to "a/b/some/thing/else"
* so, for this example, this function returns "a/b/c/d" in
* *old_dir and "a/b/some/thing/else" in *new_dir.
*
* Also, if the basename of the file changed, we don't care. We
* want to know which portion of the directory, if any, changed.
*/
end_of_old = strrchr(old_path, '/');
end_of_new = strrchr(new_path, '/');
if (end_of_old == NULL || end_of_new == NULL)
return;
while (*--end_of_new == *--end_of_old &&
end_of_old != old_path &&
end_of_new != new_path)
; /* Do nothing; all in the while loop */
/*
* We've found the first non-matching character in the directory
* paths. That means the current directory we were comparing
* represents the rename. Move end_of_old and end_of_new back
* to the full directory name.
*/
if (*end_of_old == '/')
end_of_old++;
if (*end_of_old != '/')
end_of_new++;
end_of_old = strchr(end_of_old, '/');
end_of_new = strchr(end_of_new, '/');
/*
* It may have been the case that old_path and new_path were the same
* directory all along. Don't claim a rename if they're the same.
*/
old_len = end_of_old - old_path;
new_len = end_of_new - new_path;
if (old_len != new_len || strncmp(old_path, new_path, old_len)) {
*old_dir = xstrndup(old_path, old_len);
*new_dir = xstrndup(new_path, new_len);
}
}
static void remove_hashmap_entries(struct hashmap *dir_renames,
struct string_list *items_to_remove)
{
int i;
struct dir_rename_entry *entry;
for (i = 0; i < items_to_remove->nr; i++) {
entry = items_to_remove->items[i].util;
hashmap_remove(dir_renames, entry, NULL);
}
string_list_clear(items_to_remove, 0);
}
/*
* See if there is a directory rename for path, and if there are any file
* level conflicts for the renamed location. If there is a rename and
* there are no conflicts, return the new name. Otherwise, return NULL.
*/
static char *handle_path_level_conflicts(struct merge_options *o,
const char *path,
struct dir_rename_entry *entry,
struct hashmap *collisions,
struct tree *tree)
{
char *new_path = NULL;
struct collision_entry *collision_ent;
int clean = 1;
struct strbuf collision_paths = STRBUF_INIT;
/*
* entry has the mapping of old directory name to new directory name
* that we want to apply to path.
*/
new_path = apply_dir_rename(entry, path);
if (!new_path) {
/* This should only happen when entry->non_unique_new_dir set */
if (!entry->non_unique_new_dir)
BUG("entry->non_unqiue_dir not set and !new_path");
output(o, 1, _("CONFLICT (directory rename split): "
"Unclear where to place %s because directory "
"%s was renamed to multiple other directories, "
"with no destination getting a majority of the "
"files."),
path, entry->dir);
clean = 0;
return NULL;
}
/*
* The caller needs to have ensured that it has pre-populated
* collisions with all paths that map to new_path. Do a quick check
* to ensure that's the case.
*/
collision_ent = collision_find_entry(collisions, new_path);
if (collision_ent == NULL)
BUG("collision_ent is NULL");
/*
* Check for one-sided add/add/.../add conflicts, i.e.
* where implicit renames from the other side doing
* directory rename(s) can affect this side of history
* to put multiple paths into the same location. Warn
* and bail on directory renames for such paths.
*/
if (collision_ent->reported_already) {
clean = 0;
} else if (tree_has_path(tree, new_path)) {
collision_ent->reported_already = 1;
strbuf_add_separated_string_list(&collision_paths, ", ",
&collision_ent->source_files);
output(o, 1, _("CONFLICT (implicit dir rename): Existing "
"file/dir at %s in the way of implicit "
"directory rename(s) putting the following "
"path(s) there: %s."),
new_path, collision_paths.buf);
clean = 0;
} else if (collision_ent->source_files.nr > 1) {
collision_ent->reported_already = 1;
strbuf_add_separated_string_list(&collision_paths, ", ",
&collision_ent->source_files);
output(o, 1, _("CONFLICT (implicit dir rename): Cannot map "
"more than one path to %s; implicit directory "
"renames tried to put these paths there: %s"),
new_path, collision_paths.buf);
clean = 0;
}
/* Free memory we no longer need */
strbuf_release(&collision_paths);
if (!clean && new_path) {
free(new_path);
return NULL;
}
return new_path;
}
/*
* There are a couple things we want to do at the directory level:
* 1. Check for both sides renaming to the same thing, in order to avoid
* implicit renaming of files that should be left in place. (See
* testcase 6b in t6043 for details.)
* 2. Prune directory renames if there are still files left in the
* the original directory. These represent a partial directory rename,
* i.e. a rename where only some of the files within the directory
* were renamed elsewhere. (Technically, this could be done earlier
* in get_directory_renames(), except that would prevent us from
* doing the previous check and thus failing testcase 6b.)
* 3. Check for rename/rename(1to2) conflicts (at the directory level).
* In the future, we could potentially record this info as well and
* omit reporting rename/rename(1to2) conflicts for each path within
* the affected directories, thus cleaning up the merge output.
* NOTE: We do NOT check for rename/rename(2to1) conflicts at the
* directory level, because merging directories is fine. If it
* causes conflicts for files within those merged directories, then
* that should be detected at the individual path level.
*/
static void handle_directory_level_conflicts(struct merge_options *o,
struct hashmap *dir_re_head,
struct tree *head,
struct hashmap *dir_re_merge,
struct tree *merge)
{
struct hashmap_iter iter;
struct dir_rename_entry *head_ent;
struct dir_rename_entry *merge_ent;
struct string_list remove_from_head = STRING_LIST_INIT_NODUP;
struct string_list remove_from_merge = STRING_LIST_INIT_NODUP;
hashmap_iter_init(dir_re_head, &iter);
while ((head_ent = hashmap_iter_next(&iter))) {
merge_ent = dir_rename_find_entry(dir_re_merge, head_ent->dir);
if (merge_ent &&
!head_ent->non_unique_new_dir &&
!merge_ent->non_unique_new_dir &&
!strbuf_cmp(&head_ent->new_dir, &merge_ent->new_dir)) {
/* 1. Renamed identically; remove it from both sides */
string_list_append(&remove_from_head,
head_ent->dir)->util = head_ent;
strbuf_release(&head_ent->new_dir);
string_list_append(&remove_from_merge,
merge_ent->dir)->util = merge_ent;
strbuf_release(&merge_ent->new_dir);
} else if (tree_has_path(head, head_ent->dir)) {
/* 2. This wasn't a directory rename after all */
string_list_append(&remove_from_head,
head_ent->dir)->util = head_ent;
strbuf_release(&head_ent->new_dir);
}
}
remove_hashmap_entries(dir_re_head, &remove_from_head);
remove_hashmap_entries(dir_re_merge, &remove_from_merge);
hashmap_iter_init(dir_re_merge, &iter);
while ((merge_ent = hashmap_iter_next(&iter))) {
head_ent = dir_rename_find_entry(dir_re_head, merge_ent->dir);
if (tree_has_path(merge, merge_ent->dir)) {
/* 2. This wasn't a directory rename after all */
string_list_append(&remove_from_merge,
merge_ent->dir)->util = merge_ent;
} else if (head_ent &&
!head_ent->non_unique_new_dir &&
!merge_ent->non_unique_new_dir) {
/* 3. rename/rename(1to2) */
/*
* We can assume it's not rename/rename(1to1) because
* that was case (1), already checked above. So we
* know that head_ent->new_dir and merge_ent->new_dir
* are different strings.
*/
output(o, 1, _("CONFLICT (rename/rename): "
"Rename directory %s->%s in %s. "
"Rename directory %s->%s in %s"),
head_ent->dir, head_ent->new_dir.buf, o->branch1,
head_ent->dir, merge_ent->new_dir.buf, o->branch2);
string_list_append(&remove_from_head,
head_ent->dir)->util = head_ent;
strbuf_release(&head_ent->new_dir);
string_list_append(&remove_from_merge,
merge_ent->dir)->util = merge_ent;
strbuf_release(&merge_ent->new_dir);
}
}
remove_hashmap_entries(dir_re_head, &remove_from_head);
remove_hashmap_entries(dir_re_merge, &remove_from_merge);
}
static struct hashmap *get_directory_renames(struct diff_queue_struct *pairs,
struct tree *tree)
{
struct hashmap *dir_renames;
struct hashmap_iter iter;
struct dir_rename_entry *entry;
int i;
/*
* Typically, we think of a directory rename as all files from a
* certain directory being moved to a target directory. However,
* what if someone first moved two files from the original
* directory in one commit, and then renamed the directory
* somewhere else in a later commit? At merge time, we just know
* that files from the original directory went to two different
* places, and that the bulk of them ended up in the same place.
* We want each directory rename to represent where the bulk of the
* files from that directory end up; this function exists to find
* where the bulk of the files went.
*
* The first loop below simply iterates through the list of file
* renames, finding out how often each directory rename pair
* possibility occurs.
*/
dir_renames = xmalloc(sizeof(*dir_renames));
dir_rename_init(dir_renames);
for (i = 0; i < pairs->nr; ++i) {
struct string_list_item *item;
int *count;
struct diff_filepair *pair = pairs->queue[i];
char *old_dir, *new_dir;
/* File not part of directory rename if it wasn't renamed */
if (pair->status != 'R')
continue;
get_renamed_dir_portion(pair->one->path, pair->two->path,
&old_dir, &new_dir);
if (!old_dir)
/* Directory didn't change at all; ignore this one. */
continue;
entry = dir_rename_find_entry(dir_renames, old_dir);
if (!entry) {
entry = xmalloc(sizeof(*entry));
dir_rename_entry_init(entry, old_dir);
hashmap_put(dir_renames, entry);
} else {
free(old_dir);
}
item = string_list_lookup(&entry->possible_new_dirs, new_dir);
if (!item) {
item = string_list_insert(&entry->possible_new_dirs,
new_dir);
item->util = xcalloc(1, sizeof(int));
} else {
free(new_dir);
}
count = item->util;
*count += 1;
}
/*
* For each directory with files moved out of it, we find out which
* target directory received the most files so we can declare it to
* be the "winning" target location for the directory rename. This
* winner gets recorded in new_dir. If there is no winner
* (multiple target directories received the same number of files),
* we set non_unique_new_dir. Once we've determined the winner (or
* that there is no winner), we no longer need possible_new_dirs.
*/
hashmap_iter_init(dir_renames, &iter);
while ((entry = hashmap_iter_next(&iter))) {
int max = 0;
int bad_max = 0;
char *best = NULL;
for (i = 0; i < entry->possible_new_dirs.nr; i++) {
int *count = entry->possible_new_dirs.items[i].util;
if (*count == max)
bad_max = max;
else if (*count > max) {
max = *count;
best = entry->possible_new_dirs.items[i].string;
}
}
if (bad_max == max)
entry->non_unique_new_dir = 1;
else {
assert(entry->new_dir.len == 0);
strbuf_addstr(&entry->new_dir, best);
}
/*
* The relevant directory sub-portion of the original full
* filepaths were xstrndup'ed before inserting into
* possible_new_dirs, and instead of manually iterating the
* list and free'ing each, just lie and tell
* possible_new_dirs that it did the strdup'ing so that it
* will free them for us.
*/
entry->possible_new_dirs.strdup_strings = 1;
string_list_clear(&entry->possible_new_dirs, 1);
}
return dir_renames;
}
static struct dir_rename_entry *check_dir_renamed(const char *path,
struct hashmap *dir_renames)
{
char *temp = xstrdup(path);
char *end;
struct dir_rename_entry *entry = NULL;;
while ((end = strrchr(temp, '/'))) {
*end = '\0';
entry = dir_rename_find_entry(dir_renames, temp);
if (entry)
break;
}
free(temp);
return entry;
}
static void compute_collisions(struct hashmap *collisions,
struct hashmap *dir_renames,
struct diff_queue_struct *pairs)
{
int i;
/*
* Multiple files can be mapped to the same path due to directory
* renames done by the other side of history. Since that other
* side of history could have merged multiple directories into one,
* if our side of history added the same file basename to each of
* those directories, then all N of them would get implicitly
* renamed by the directory rename detection into the same path,
* and we'd get an add/add/.../add conflict, and all those adds
* from *this* side of history. This is not representable in the
* index, and users aren't going to easily be able to make sense of
* it. So we need to provide a good warning about what's
* happening, and fall back to no-directory-rename detection
* behavior for those paths.
*
* See testcases 9e and all of section 5 from t6043 for examples.
*/
collision_init(collisions);
for (i = 0; i < pairs->nr; ++i) {
struct dir_rename_entry *dir_rename_ent;
struct collision_entry *collision_ent;
char *new_path;
struct diff_filepair *pair = pairs->queue[i];
if (pair->status != 'A' && pair->status != 'R')
continue;
dir_rename_ent = check_dir_renamed(pair->two->path,
dir_renames);
if (!dir_rename_ent)
continue;
new_path = apply_dir_rename(dir_rename_ent, pair->two->path);
if (!new_path)
/*
* dir_rename_ent->non_unique_new_path is true, which
* means there is no directory rename for us to use,
* which means it won't cause us any additional
* collisions.
*/
continue;
collision_ent = collision_find_entry(collisions, new_path);
if (!collision_ent) {
collision_ent = xcalloc(1,
sizeof(struct collision_entry));
hashmap_entry_init(collision_ent, strhash(new_path));
hashmap_put(collisions, collision_ent);
collision_ent->target_file = new_path;
} else {
free(new_path);
}
string_list_insert(&collision_ent->source_files,
pair->two->path);
}
}
static char *check_for_directory_rename(struct merge_options *o,
const char *path,
struct tree *tree,
struct hashmap *dir_renames,
struct hashmap *dir_rename_exclusions,
struct hashmap *collisions,
int *clean_merge)
{
char *new_path = NULL;
struct dir_rename_entry *entry = check_dir_renamed(path, dir_renames);
struct dir_rename_entry *oentry = NULL;
if (!entry)
return new_path;
/*
* This next part is a little weird. We do not want to do an
* implicit rename into a directory we renamed on our side, because
* that will result in a spurious rename/rename(1to2) conflict. An
* example:
* Base commit: dumbdir/afile, otherdir/bfile
* Side 1: smrtdir/afile, otherdir/bfile
* Side 2: dumbdir/afile, dumbdir/bfile
* Here, while working on Side 1, we could notice that otherdir was
* renamed/merged to dumbdir, and change the diff_filepair for
* otherdir/bfile into a rename into dumbdir/bfile. However, Side
* 2 will notice the rename from dumbdir to smrtdir, and do the
* transitive rename to move it from dumbdir/bfile to
* smrtdir/bfile. That gives us bfile in dumbdir vs being in
* smrtdir, a rename/rename(1to2) conflict. We really just want
* the file to end up in smrtdir. And the way to achieve that is
* to not let Side1 do the rename to dumbdir, since we know that is
* the source of one of our directory renames.
*
* That's why oentry and dir_rename_exclusions is here.
*
* As it turns out, this also prevents N-way transient rename
* confusion; See testcases 9c and 9d of t6043.
*/
oentry = dir_rename_find_entry(dir_rename_exclusions, entry->new_dir.buf);
if (oentry) {
output(o, 1, _("WARNING: Avoiding applying %s -> %s rename "
"to %s, because %s itself was renamed."),
entry->dir, entry->new_dir.buf, path, entry->new_dir.buf);
} else {
new_path = handle_path_level_conflicts(o, path, entry,
collisions, tree);
*clean_merge &= (new_path != NULL);
}
return new_path;
}
static void apply_directory_rename_modifications(struct merge_options *o,
struct diff_filepair *pair,
char *new_path,
struct rename *re,
struct tree *tree,
struct tree *o_tree,
struct tree *a_tree,
struct tree *b_tree,
struct string_list *entries,
int *clean)
{
struct string_list_item *item;
int stage = (tree == a_tree ? 2 : 3);
int update_wd;
/*
* In all cases where we can do directory rename detection,
* unpack_trees() will have read pair->two->path into the
* index and the working copy. We need to remove it so that
* we can instead place it at new_path. It is guaranteed to
* not be untracked (unpack_trees() would have errored out
* saying the file would have been overwritten), but it might
* be dirty, though.
*/
update_wd = !was_dirty(o, pair->two->path);
if (!update_wd)
output(o, 1, _("Refusing to lose dirty file at %s"),
pair->two->path);
remove_file(o, 1, pair->two->path, !update_wd);
/* Find or create a new re->dst_entry */
item = string_list_lookup(entries, new_path);
if (item) {
/*
* Since we're renaming on this side of history, and it's
* due to a directory rename on the other side of history
* (which we only allow when the directory in question no
* longer exists on the other side of history), the
* original entry for re->dst_entry is no longer
* necessary...
*/
re->dst_entry->processed = 1;
/*
* ...because we'll be using this new one.
*/
re->dst_entry = item->util;
} else {
/*
* re->dst_entry is for the before-dir-rename path, and we
* need it to hold information for the after-dir-rename
* path. Before creating a new entry, we need to mark the
* old one as unnecessary (...unless it is shared by
* src_entry, i.e. this didn't use to be a rename, in which
* case we can just allow the normal processing to happen
* for it).
*/
if (pair->status == 'R')
re->dst_entry->processed = 1;
re->dst_entry = insert_stage_data(new_path,
o_tree, a_tree, b_tree,
entries);
item = string_list_insert(entries, new_path);
item->util = re->dst_entry;
}
/*
* Update the stage_data with the information about the path we are
* moving into place. That slot will be empty and available for us
* to write to because of the collision checks in
* handle_path_level_conflicts(). In other words,
* re->dst_entry->stages[stage].oid will be the null_oid, so it's
* open for us to write to.
*
* It may be tempting to actually update the index at this point as
* well, using update_stages_for_stage_data(), but as per the big
* "NOTE" in update_stages(), doing so will modify the current
* in-memory index which will break calls to would_lose_untracked()
* that we need to make. Instead, we need to just make sure that
* the various conflict_rename_*() functions update the index
* explicitly rather than relying on unpack_trees() to have done it.
*/
get_tree_entry(&tree->object.oid,
pair->two->path,
&re->dst_entry->stages[stage].oid,
&re->dst_entry->stages[stage].mode);
/* Update pair status */
if (pair->status == 'A') {
/*
* Recording rename information for this add makes it look
* like a rename/delete conflict. Make sure we can
* correctly handle this as an add that was moved to a new
* directory instead of reporting a rename/delete conflict.
*/
re->add_turned_into_rename = 1;
}
/*
* We don't actually look at pair->status again, but it seems
* pedagogically correct to adjust it.
*/
pair->status = 'R';
/*
* Finally, record the new location.
*/
pair->two->path = new_path;
}
/*
* Get information of all renames which occurred in 'pairs', making use of
* any implicit directory renames inferred from the other side of history.
* We need the three trees in the merge ('o_tree', 'a_tree' and 'b_tree')
* to be able to associate the correct cache entries with the rename
* information; tree is always equal to either a_tree or b_tree.
*/
static struct string_list *get_renames(struct merge_options *o,
struct diff_queue_struct *pairs,
struct hashmap *dir_renames,
struct hashmap *dir_rename_exclusions,
struct tree *tree,
struct tree *o_tree,
struct tree *a_tree,
struct tree *b_tree,
struct string_list *entries,
int *clean_merge)
{
int i;
struct hashmap collisions;
struct hashmap_iter iter;
struct collision_entry *e;
struct string_list *renames;
compute_collisions(&collisions, dir_renames, pairs);
renames = xcalloc(1, sizeof(struct string_list));
for (i = 0; i < pairs->nr; ++i) {
struct string_list_item *item;
struct rename *re;
struct diff_filepair *pair = pairs->queue[i];
char *new_path; /* non-NULL only with directory renames */
if (pair->status != 'A' && pair->status != 'R') {
diff_free_filepair(pair);
continue;
}
new_path = check_for_directory_rename(o, pair->two->path, tree,
dir_renames,
dir_rename_exclusions,
&collisions,
clean_merge);
if (pair->status != 'R' && !new_path) {
diff_free_filepair(pair);
continue;
}
re = xmalloc(sizeof(*re));
re->processed = 0;
re->add_turned_into_rename = 0;
re->pair = pair;
item = string_list_lookup(entries, re->pair->one->path);
if (!item)
re->src_entry = insert_stage_data(re->pair->one->path,
o_tree, a_tree, b_tree, entries);
else
re->src_entry = item->util;
item = string_list_lookup(entries, re->pair->two->path);
if (!item)
re->dst_entry = insert_stage_data(re->pair->two->path,
o_tree, a_tree, b_tree, entries);
else
re->dst_entry = item->util;
item = string_list_insert(renames, pair->one->path);
item->util = re;
if (new_path)
apply_directory_rename_modifications(o, pair, new_path,
re, tree, o_tree,
a_tree, b_tree,
entries,
clean_merge);
}
hashmap_iter_init(&collisions, &iter);
while ((e = hashmap_iter_next(&iter))) {
free(e->target_file);
string_list_clear(&e->source_files, 0);
}
hashmap_free(&collisions, 1);
return renames;
}
static int process_renames(struct merge_options *o,
struct string_list *a_renames,
struct string_list *b_renames)
{
int clean_merge = 1, i, j;
struct string_list a_by_dst = STRING_LIST_INIT_NODUP;
struct string_list b_by_dst = STRING_LIST_INIT_NODUP;
const struct rename *sre;
for (i = 0; i < a_renames->nr; i++) {
sre = a_renames->items[i].util;
string_list_insert(&a_by_dst, sre->pair->two->path)->util
= (void *)sre;
}
for (i = 0; i < b_renames->nr; i++) {
sre = b_renames->items[i].util;
string_list_insert(&b_by_dst, sre->pair->two->path)->util
= (void *)sre;
}
for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) {
struct string_list *renames1, *renames2Dst;
struct rename *ren1 = NULL, *ren2 = NULL;
const char *branch1, *branch2;
const char *ren1_src, *ren1_dst;
struct string_list_item *lookup;
if (i >= a_renames->nr) {
ren2 = b_renames->items[j++].util;
} else if (j >= b_renames->nr) {
ren1 = a_renames->items[i++].util;
} else {
int compare = strcmp(a_renames->items[i].string,
b_renames->items[j].string);
if (compare <= 0)
ren1 = a_renames->items[i++].util;
if (compare >= 0)
ren2 = b_renames->items[j++].util;
}
/* TODO: refactor, so that 1/2 are not needed */
if (ren1) {
renames1 = a_renames;
renames2Dst = &b_by_dst;
branch1 = o->branch1;
branch2 = o->branch2;
} else {
renames1 = b_renames;
renames2Dst = &a_by_dst;
branch1 = o->branch2;
branch2 = o->branch1;
SWAP(ren2, ren1);
}
if (ren1->processed)
continue;
ren1->processed = 1;
ren1->dst_entry->processed = 1;
/* BUG: We should only mark src_entry as processed if we
* are not dealing with a rename + add-source case.
*/
ren1->src_entry->processed = 1;
ren1_src = ren1->pair->one->path;
ren1_dst = ren1->pair->two->path;
if (ren2) {
/* One file renamed on both sides */
const char *ren2_src = ren2->pair->one->path;
const char *ren2_dst = ren2->pair->two->path;
enum rename_type rename_type;
if (strcmp(ren1_src, ren2_src) != 0)
BUG("ren1_src != ren2_src");
ren2->dst_entry->processed = 1;
ren2->processed = 1;
if (strcmp(ren1_dst, ren2_dst) != 0) {
rename_type = RENAME_ONE_FILE_TO_TWO;
clean_merge = 0;
} else {
rename_type = RENAME_ONE_FILE_TO_ONE;
/* BUG: We should only remove ren1_src in
* the base stage (think of rename +
* add-source cases).
*/
remove_file(o, 1, ren1_src, 1);
update_entry(ren1->dst_entry,
ren1->pair->one,
ren1->pair->two,
ren2->pair->two);
}
setup_rename_conflict_info(rename_type,
ren1->pair,
ren2->pair,
branch1,
branch2,
ren1->dst_entry,
ren2->dst_entry,
o,
NULL,
NULL);
} else if ((lookup = string_list_lookup(renames2Dst, ren1_dst))) {
/* Two different files renamed to the same thing */
char *ren2_dst;
ren2 = lookup->util;
ren2_dst = ren2->pair->two->path;
if (strcmp(ren1_dst, ren2_dst) != 0)
BUG("ren1_dst != ren2_dst");
clean_merge = 0;
ren2->processed = 1;
/*
* BUG: We should only mark src_entry as processed
* if we are not dealing with a rename + add-source
* case.
*/
ren2->src_entry->processed = 1;
setup_rename_conflict_info(RENAME_TWO_FILES_TO_ONE,
ren1->pair,
ren2->pair,
branch1,
branch2,
ren1->dst_entry,
ren2->dst_entry,
o,
ren1->src_entry,
ren2->src_entry);
} else {
/* Renamed in 1, maybe changed in 2 */
/* we only use sha1 and mode of these */
struct diff_filespec src_other, dst_other;
int try_merge;
/*
* unpack_trees loads entries from common-commit
* into stage 1, from head-commit into stage 2, and
* from merge-commit into stage 3. We keep track
* of which side corresponds to the rename.
*/
int renamed_stage = a_renames == renames1 ? 2 : 3;
int other_stage = a_renames == renames1 ? 3 : 2;
/* BUG: We should only remove ren1_src in the base
* stage and in other_stage (think of rename +
* add-source case).
*/
remove_file(o, 1, ren1_src,
renamed_stage == 2 || !was_tracked(o, ren1_src));
oidcpy(&src_other.oid,
&ren1->src_entry->stages[other_stage].oid);
src_other.mode = ren1->src_entry->stages[other_stage].mode;
oidcpy(&dst_other.oid,
&ren1->dst_entry->stages[other_stage].oid);
dst_other.mode = ren1->dst_entry->stages[other_stage].mode;
try_merge = 0;
if (oid_eq(&src_other.oid, &null_oid) &&
ren1->add_turned_into_rename) {
setup_rename_conflict_info(RENAME_DIR,
ren1->pair,
NULL,
branch1,
branch2,
ren1->dst_entry,
NULL,
o,
NULL,
NULL);
} else if (oid_eq(&src_other.oid, &null_oid)) {
setup_rename_conflict_info(RENAME_DELETE,
ren1->pair,
NULL,
branch1,
branch2,
ren1->dst_entry,
NULL,
o,
NULL,
NULL);
} else if ((dst_other.mode == ren1->pair->two->mode) &&
oid_eq(&dst_other.oid, &ren1->pair->two->oid)) {
/*
* Added file on the other side identical to
* the file being renamed: clean merge.
* Also, there is no need to overwrite the
* file already in the working copy, so call
* update_file_flags() instead of
* update_file().
*/
if (update_file_flags(o,
&ren1->pair->two->oid,
ren1->pair->two->mode,
ren1_dst,
1, /* update_cache */
0 /* update_wd */))
clean_merge = -1;
} else if (!oid_eq(&dst_other.oid, &null_oid)) {
clean_merge = 0;
try_merge = 1;
output(o, 1, _("CONFLICT (rename/add): Rename %s->%s in %s. "
"%s added in %s"),
ren1_src, ren1_dst, branch1,
ren1_dst, branch2);
if (o->call_depth) {
struct merge_file_info mfi;
if (merge_file_one(o, ren1_dst, &null_oid, 0,
&ren1->pair->two->oid,
ren1->pair->two->mode,
&dst_other.oid,
dst_other.mode,
branch1, branch2, &mfi)) {
clean_merge = -1;
goto cleanup_and_return;
}
output(o, 1, _("Adding merged %s"), ren1_dst);
if (update_file(o, 0, &mfi.oid,
mfi.mode, ren1_dst))
clean_merge = -1;
try_merge = 0;
} else {
char *new_path = unique_path(o, ren1_dst, branch2);
output(o, 1, _("Adding as %s instead"), new_path);
if (update_file(o, 0, &dst_other.oid,
dst_other.mode, new_path))
clean_merge = -1;
free(new_path);
}
} else
try_merge = 1;
if (clean_merge < 0)
goto cleanup_and_return;
if (try_merge) {
struct diff_filespec *one, *a, *b;
src_other.path = (char *)ren1_src;
one = ren1->pair->one;
if (a_renames == renames1) {
a = ren1->pair->two;
b = &src_other;
} else {
b = ren1->pair->two;
a = &src_other;
}
update_entry(ren1->dst_entry, one, a, b);
setup_rename_conflict_info(RENAME_NORMAL,
ren1->pair,
NULL,
branch1,
NULL,
ren1->dst_entry,
NULL,
o,
NULL,
NULL);
}
}
}
cleanup_and_return:
string_list_clear(&a_by_dst, 0);
string_list_clear(&b_by_dst, 0);
return clean_merge;
}
struct rename_info {
struct string_list *head_renames;
struct string_list *merge_renames;
};
static void initial_cleanup_rename(struct diff_queue_struct *pairs,
struct hashmap *dir_renames)
{
struct hashmap_iter iter;
struct dir_rename_entry *e;
hashmap_iter_init(dir_renames, &iter);
while ((e = hashmap_iter_next(&iter))) {
free(e->dir);
strbuf_release(&e->new_dir);
/* possible_new_dirs already cleared in get_directory_renames */
}
hashmap_free(dir_renames, 1);
free(dir_renames);
free(pairs->queue);
free(pairs);
}
static int handle_renames(struct merge_options *o,
struct tree *common,
struct tree *head,
struct tree *merge,
struct string_list *entries,
struct rename_info *ri)
{
struct diff_queue_struct *head_pairs, *merge_pairs;
struct hashmap *dir_re_head, *dir_re_merge;
int clean = 1;
ri->head_renames = NULL;
ri->merge_renames = NULL;
if (!merge_detect_rename(o))
return 1;
head_pairs = get_diffpairs(o, common, head);
merge_pairs = get_diffpairs(o, common, merge);
dir_re_head = get_directory_renames(head_pairs, head);
dir_re_merge = get_directory_renames(merge_pairs, merge);
handle_directory_level_conflicts(o,
dir_re_head, head,
dir_re_merge, merge);
ri->head_renames = get_renames(o, head_pairs,
dir_re_merge, dir_re_head, head,
common, head, merge, entries,
&clean);
if (clean < 0)
goto cleanup;
ri->merge_renames = get_renames(o, merge_pairs,
dir_re_head, dir_re_merge, merge,
common, head, merge, entries,
&clean);
if (clean < 0)
goto cleanup;
clean &= process_renames(o, ri->head_renames, ri->merge_renames);
cleanup:
/*
* Some cleanup is deferred until cleanup_renames() because the
* data structures are still needed and referenced in
* process_entry(). But there are a few things we can free now.
*/
initial_cleanup_rename(head_pairs, dir_re_head);
initial_cleanup_rename(merge_pairs, dir_re_merge);
return clean;
}
static void final_cleanup_rename(struct string_list *rename)
{
const struct rename *re;
int i;
if (rename == NULL)
return;
for (i = 0; i < rename->nr; i++) {
re = rename->items[i].util;
diff_free_filepair(re->pair);
}
string_list_clear(rename, 1);
free(rename);
}
static void final_cleanup_renames(struct rename_info *re_info)
{
final_cleanup_rename(re_info->head_renames);
final_cleanup_rename(re_info->merge_renames);
}
static struct object_id *stage_oid(const struct object_id *oid, unsigned mode)
{
return (is_null_oid(oid) || mode == 0) ? NULL: (struct object_id *)oid;
}
static int read_oid_strbuf(struct merge_options *o,
const struct object_id *oid, struct strbuf *dst)
{
void *buf;
enum object_type type;
unsigned long size;
buf = read_object_file(oid, &type, &size);
if (!buf)
return err(o, _("cannot read object %s"), oid_to_hex(oid));
if (type != OBJ_BLOB) {
free(buf);
return err(o, _("object %s is not a blob"), oid_to_hex(oid));
}
strbuf_attach(dst, buf, size, size + 1);
return 0;
}
static int blob_unchanged(struct merge_options *opt,
const struct object_id *o_oid,
unsigned o_mode,
const struct object_id *a_oid,
unsigned a_mode,
int renormalize, const char *path)
{
struct strbuf o = STRBUF_INIT;
struct strbuf a = STRBUF_INIT;
int ret = 0; /* assume changed for safety */
if (a_mode != o_mode)
return 0;
if (oid_eq(o_oid, a_oid))
return 1;
if (!renormalize)
return 0;
assert(o_oid && a_oid);
if (read_oid_strbuf(opt, o_oid, &o) || read_oid_strbuf(opt, a_oid, &a))
goto error_return;
/*
* Note: binary | is used so that both renormalizations are
* performed. Comparison can be skipped if both files are
* unchanged since their sha1s have already been compared.
*/
if (renormalize_buffer(&the_index, path, o.buf, o.len, &o) |
renormalize_buffer(&the_index, path, a.buf, a.len, &a))
ret = (o.len == a.len && !memcmp(o.buf, a.buf, o.len));
error_return:
strbuf_release(&o);
strbuf_release(&a);
return ret;
}
static int handle_modify_delete(struct merge_options *o,
const char *path,
struct object_id *o_oid, int o_mode,
struct object_id *a_oid, int a_mode,
struct object_id *b_oid, int b_mode)
{
const char *modify_branch, *delete_branch;
struct object_id *changed_oid;
int changed_mode;
if (a_oid) {
modify_branch = o->branch1;
delete_branch = o->branch2;
changed_oid = a_oid;
changed_mode = a_mode;
} else {
modify_branch = o->branch2;
delete_branch = o->branch1;
changed_oid = b_oid;
changed_mode = b_mode;
}
return handle_change_delete(o,
path, NULL,
o_oid, o_mode,
changed_oid, changed_mode,
modify_branch, delete_branch,
_("modify"), _("modified"));
}
static int merge_content(struct merge_options *o,
const char *path,
int is_dirty,
struct object_id *o_oid, int o_mode,
struct object_id *a_oid, int a_mode,
struct object_id *b_oid, int b_mode,
struct rename_conflict_info *rename_conflict_info)
{
const char *reason = _("content");
const char *path1 = NULL, *path2 = NULL;
struct merge_file_info mfi;
struct diff_filespec one, a, b;
unsigned df_conflict_remains = 0;
if (!o_oid) {
reason = _("add/add");
o_oid = (struct object_id *)&null_oid;
}
one.path = a.path = b.path = (char *)path;
oidcpy(&one.oid, o_oid);
one.mode = o_mode;
oidcpy(&a.oid, a_oid);
a.mode = a_mode;
oidcpy(&b.oid, b_oid);
b.mode = b_mode;
if (rename_conflict_info) {
struct diff_filepair *pair1 = rename_conflict_info->pair1;
path1 = (o->branch1 == rename_conflict_info->branch1) ?
pair1->two->path : pair1->one->path;
/* If rename_conflict_info->pair2 != NULL, we are in
* RENAME_ONE_FILE_TO_ONE case. Otherwise, we have a
* normal rename.
*/
path2 = (rename_conflict_info->pair2 ||
o->branch2 == rename_conflict_info->branch1) ?
pair1->two->path : pair1->one->path;
if (dir_in_way(path, !o->call_depth,
S_ISGITLINK(pair1->two->mode)))
df_conflict_remains = 1;
}
if (merge_file_special_markers(o, &one, &a, &b, path,
o->branch1, path1,
o->branch2, path2, &mfi))
return -1;
/*
* We can skip updating the working tree file iff:
* a) The merge is clean
* b) The merge matches what was in HEAD (content, mode, pathname)
* c) The target path is usable (i.e. not involved in D/F conflict)
*/
if (mfi.clean &&
was_tracked_and_matches(o, path, &mfi.oid, mfi.mode) &&
!df_conflict_remains) {
output(o, 3, _("Skipped %s (merged same as existing)"), path);
if (add_cacheinfo(o, mfi.mode, &mfi.oid, path,
0, (!o->call_depth && !is_dirty), 0))
return -1;
return mfi.clean;
}
if (!mfi.clean) {
if (S_ISGITLINK(mfi.mode))
reason = _("submodule");
output(o, 1, _("CONFLICT (%s): Merge conflict in %s"),
reason, path);
if (rename_conflict_info && !df_conflict_remains)
if (update_stages(o, path, &one, &a, &b))
return -1;
}
if (df_conflict_remains || is_dirty) {
char *new_path;
if (o->call_depth) {
remove_file_from_cache(path);
} else {
if (!mfi.clean) {
if (update_stages(o, path, &one, &a, &b))
return -1;
} else {
int file_from_stage2 = was_tracked(o, path);
struct diff_filespec merged;
oidcpy(&merged.oid, &mfi.oid);
merged.mode = mfi.mode;
if (update_stages(o, path, NULL,
file_from_stage2 ? &merged : NULL,
file_from_stage2 ? NULL : &merged))
return -1;
}
}
new_path = unique_path(o, path, rename_conflict_info->branch1);
if (is_dirty) {
output(o, 1, _("Refusing to lose dirty file at %s"),
path);
}
output(o, 1, _("Adding as %s instead"), new_path);
if (update_file(o, 0, &mfi.oid, mfi.mode, new_path)) {
free(new_path);
return -1;
}
free(new_path);
mfi.clean = 0;
} else if (update_file(o, mfi.clean, &mfi.oid, mfi.mode, path))
return -1;
return !is_dirty && mfi.clean;
}
static int conflict_rename_normal(struct merge_options *o,
const char *path,
struct object_id *o_oid, unsigned int o_mode,
struct object_id *a_oid, unsigned int a_mode,
struct object_id *b_oid, unsigned int b_mode,
struct rename_conflict_info *ci)
{
/* Merge the content and write it out */
return merge_content(o, path, was_dirty(o, path),
o_oid, o_mode, a_oid, a_mode, b_oid, b_mode,
ci);
}
/* Per entry merge function */
static int process_entry(struct merge_options *o,
const char *path, struct stage_data *entry)
{
int clean_merge = 1;
int normalize = o->renormalize;
unsigned o_mode = entry->stages[1].mode;
unsigned a_mode = entry->stages[2].mode;
unsigned b_mode = entry->stages[3].mode;
struct object_id *o_oid = stage_oid(&entry->stages[1].oid, o_mode);
struct object_id *a_oid = stage_oid(&entry->stages[2].oid, a_mode);
struct object_id *b_oid = stage_oid(&entry->stages[3].oid, b_mode);
entry->processed = 1;
if (entry->rename_conflict_info) {
struct rename_conflict_info *conflict_info = entry->rename_conflict_info;
switch (conflict_info->rename_type) {
case RENAME_NORMAL:
case RENAME_ONE_FILE_TO_ONE:
clean_merge = conflict_rename_normal(o,
path,
o_oid, o_mode,
a_oid, a_mode,
b_oid, b_mode,
conflict_info);
break;
case RENAME_DIR:
clean_merge = 1;
if (conflict_rename_dir(o,
conflict_info->pair1,
conflict_info->branch1,
conflict_info->branch2))
clean_merge = -1;
break;
case RENAME_DELETE:
clean_merge = 0;
if (conflict_rename_delete(o,
conflict_info->pair1,
conflict_info->branch1,
conflict_info->branch2))
clean_merge = -1;
break;
case RENAME_ONE_FILE_TO_TWO:
clean_merge = 0;
if (conflict_rename_rename_1to2(o, conflict_info))
clean_merge = -1;
break;
case RENAME_TWO_FILES_TO_ONE:
clean_merge = 0;
if (conflict_rename_rename_2to1(o, conflict_info))
clean_merge = -1;
break;
default:
entry->processed = 0;
break;
}
} else if (o_oid && (!a_oid || !b_oid)) {
/* Case A: Deleted in one */
if ((!a_oid && !b_oid) ||
(!b_oid && blob_unchanged(o, o_oid, o_mode, a_oid, a_mode, normalize, path)) ||
(!a_oid && blob_unchanged(o, o_oid, o_mode, b_oid, b_mode, normalize, path))) {
/* Deleted in both or deleted in one and
* unchanged in the other */
if (a_oid)
output(o, 2, _("Removing %s"), path);
/* do not touch working file if it did not exist */
remove_file(o, 1, path, !a_oid);
} else {
/* Modify/delete; deleted side may have put a directory in the way */
clean_merge = 0;
if (handle_modify_delete(o, path, o_oid, o_mode,
a_oid, a_mode, b_oid, b_mode))
clean_merge = -1;
}
} else if ((!o_oid && a_oid && !b_oid) ||
(!o_oid && !a_oid && b_oid)) {
/* Case B: Added in one. */
/* [nothing|directory] -> ([nothing|directory], file) */
const char *add_branch;
const char *other_branch;
unsigned mode;
const struct object_id *oid;
const char *conf;
if (a_oid) {
add_branch = o->branch1;
other_branch = o->branch2;
mode = a_mode;
oid = a_oid;
conf = _("file/directory");
} else {
add_branch = o->branch2;
other_branch = o->branch1;
mode = b_mode;
oid = b_oid;
conf = _("directory/file");
}
if (dir_in_way(path,
!o->call_depth && !S_ISGITLINK(a_mode),
0)) {
char *new_path = unique_path(o, path, add_branch);
clean_merge = 0;
output(o, 1, _("CONFLICT (%s): There is a directory with name %s in %s. "
"Adding %s as %s"),
conf, path, other_branch, path, new_path);
if (update_file(o, 0, oid, mode, new_path))
clean_merge = -1;
else if (o->call_depth)
remove_file_from_cache(path);
free(new_path);
} else {
output(o, 2, _("Adding %s"), path);
/* do not overwrite file if already present */
if (update_file_flags(o, oid, mode, path, 1, !a_oid))
clean_merge = -1;
}
} else if (a_oid && b_oid) {
/* Case C: Added in both (check for same permissions) and */
/* case D: Modified in both, but differently. */
int is_dirty = 0; /* unpack_trees would have bailed if dirty */
clean_merge = merge_content(o, path, is_dirty,
o_oid, o_mode, a_oid, a_mode, b_oid, b_mode,
NULL);
} else if (!o_oid && !a_oid && !b_oid) {
/*
* this entry was deleted altogether. a_mode == 0 means
* we had that path and want to actively remove it.
*/
remove_file(o, 1, path, !a_mode);
} else
BUG("fatal merge failure, shouldn't happen.");
return clean_merge;
}
int merge_trees(struct merge_options *o,
struct tree *head,
struct tree *merge,
struct tree *common,
struct tree **result)
{
int code, clean;
if (o->subtree_shift) {
merge = shift_tree_object(head, merge, o->subtree_shift);
common = shift_tree_object(head, common, o->subtree_shift);
}
if (oid_eq(&common->object.oid, &merge->object.oid)) {
struct strbuf sb = STRBUF_INIT;
if (!o->call_depth && index_has_changes(&sb)) {
err(o, _("Dirty index: cannot merge (dirty: %s)"),
sb.buf);
return 0;
}
output(o, 0, _("Already up to date!"));
*result = head;
return 1;
}
code = unpack_trees_start(o, common, head, merge);
if (code != 0) {
if (show(o, 4) || o->call_depth)
err(o, _("merging of trees %s and %s failed"),
oid_to_hex(&head->object.oid),
oid_to_hex(&merge->object.oid));
unpack_trees_finish(o);
return -1;
}
if (unmerged_cache()) {
struct string_list *entries;
struct rename_info re_info;
int i;
/*
* Only need the hashmap while processing entries, so
* initialize it here and free it when we are done running
* through the entries. Keeping it in the merge_options as
* opposed to decaring a local hashmap is for convenience
* so that we don't have to pass it to around.
*/
hashmap_init(&o->current_file_dir_set, path_hashmap_cmp, NULL, 512);
get_files_dirs(o, head);
get_files_dirs(o, merge);
entries = get_unmerged();
clean = handle_renames(o, common, head, merge, entries,
&re_info);
record_df_conflict_files(o, entries);
if (clean < 0)
goto cleanup;
for (i = entries->nr-1; 0 <= i; i--) {
const char *path = entries->items[i].string;
struct stage_data *e = entries->items[i].util;
if (!e->processed) {
int ret = process_entry(o, path, e);
if (!ret)
clean = 0;
else if (ret < 0) {
clean = ret;
goto cleanup;
}
}
}
for (i = 0; i < entries->nr; i++) {
struct stage_data *e = entries->items[i].util;
if (!e->processed)
BUG("unprocessed path??? %s",
entries->items[i].string);
}
cleanup:
final_cleanup_renames(&re_info);
string_list_clear(entries, 1);
free(entries);
hashmap_free(&o->current_file_dir_set, 1);
if (clean < 0) {
unpack_trees_finish(o);
return clean;
}
}
else
clean = 1;
unpack_trees_finish(o);
if (o->call_depth && !(*result = write_tree_from_memory(o)))
return -1;
return clean;
}
static struct commit_list *reverse_commit_list(struct commit_list *list)
{
struct commit_list *next = NULL, *current, *backup;
for (current = list; current; current = backup) {
backup = current->next;
current->next = next;
next = current;
}
return next;
}
/*
* Merge the commits h1 and h2, return the resulting virtual
* commit object and a flag indicating the cleanness of the merge.
*/
int merge_recursive(struct merge_options *o,
struct commit *h1,
struct commit *h2,
struct commit_list *ca,
struct commit **result)
{
struct commit_list *iter;
struct commit *merged_common_ancestors;
struct tree *mrtree;
int clean;
if (show(o, 4)) {
output(o, 4, _("Merging:"));
output_commit_title(o, h1);
output_commit_title(o, h2);
}
if (!ca) {
ca = get_merge_bases(h1, h2);
ca = reverse_commit_list(ca);
}
if (show(o, 5)) {
unsigned cnt = commit_list_count(ca);
output(o, 5, Q_("found %u common ancestor:",
"found %u common ancestors:", cnt), cnt);
for (iter = ca; iter; iter = iter->next)
output_commit_title(o, iter->item);
}
merged_common_ancestors = pop_commit(&ca);
if (merged_common_ancestors == NULL) {
/* if there is no common ancestor, use an empty tree */
struct tree *tree;
tree = lookup_tree(the_repository, the_repository->hash_algo->empty_tree);
merged_common_ancestors = make_virtual_commit(tree, "ancestor");
}
for (iter = ca; iter; iter = iter->next) {
const char *saved_b1, *saved_b2;
o->call_depth++;
/*
* When the merge fails, the result contains files
* with conflict markers. The cleanness flag is
* ignored (unless indicating an error), it was never
* actually used, as result of merge_trees has always
* overwritten it: the committed "conflicts" were
* already resolved.
*/
discard_cache();
saved_b1 = o->branch1;
saved_b2 = o->branch2;
o->branch1 = "Temporary merge branch 1";
o->branch2 = "Temporary merge branch 2";
if (merge_recursive(o, merged_common_ancestors, iter->item,
NULL, &merged_common_ancestors) < 0)
return -1;
o->branch1 = saved_b1;
o->branch2 = saved_b2;
o->call_depth--;
if (!merged_common_ancestors)
return err(o, _("merge returned no commit"));
}
discard_cache();
if (!o->call_depth)
read_cache();
o->ancestor = "merged common ancestors";
clean = merge_trees(o, get_commit_tree(h1), get_commit_tree(h2),
get_commit_tree(merged_common_ancestors),
&mrtree);
if (clean < 0) {
flush_output(o);
return clean;
}
if (o->call_depth) {
*result = make_virtual_commit(mrtree, "merged tree");
commit_list_insert(h1, &(*result)->parents);
commit_list_insert(h2, &(*result)->parents->next);
}
flush_output(o);
if (!o->call_depth && o->buffer_output < 2)
strbuf_release(&o->obuf);
if (show(o, 2))
diff_warn_rename_limit("merge.renamelimit",
o->needed_rename_limit, 0);
return clean;
}
static struct commit *get_ref(const struct object_id *oid, const char *name)
{
struct object *object;
object = deref_tag(the_repository, parse_object(the_repository, oid),
name,
strlen(name));
if (!object)
return NULL;
if (object->type == OBJ_TREE)
return make_virtual_commit((struct tree*)object, name);
if (object->type != OBJ_COMMIT)
return NULL;
if (parse_commit((struct commit *)object))
return NULL;
return (struct commit *)object;
}
int merge_recursive_generic(struct merge_options *o,
const struct object_id *head,
const struct object_id *merge,
int num_base_list,
const struct object_id **base_list,
struct commit **result)
{
int clean;
struct lock_file lock = LOCK_INIT;
struct commit *head_commit = get_ref(head, o->branch1);
struct commit *next_commit = get_ref(merge, o->branch2);
struct commit_list *ca = NULL;
if (base_list) {
int i;
for (i = 0; i < num_base_list; ++i) {
struct commit *base;
if (!(base = get_ref(base_list[i], oid_to_hex(base_list[i]))))
return err(o, _("Could not parse object '%s'"),
oid_to_hex(base_list[i]));
commit_list_insert(base, &ca);
}
}
hold_locked_index(&lock, LOCK_DIE_ON_ERROR);
clean = merge_recursive(o, head_commit, next_commit, ca,
result);
if (clean < 0) {
rollback_lock_file(&lock);
return clean;
}
if (write_locked_index(&the_index, &lock,
COMMIT_LOCK | SKIP_IF_UNCHANGED))
return err(o, _("Unable to write index."));
return clean ? 0 : 1;
}
static void merge_recursive_config(struct merge_options *o)
{
char *value = NULL;
git_config_get_int("merge.verbosity", &o->verbosity);
git_config_get_int("diff.renamelimit", &o->diff_rename_limit);
git_config_get_int("merge.renamelimit", &o->merge_rename_limit);
if (!git_config_get_string("diff.renames", &value)) {
o->diff_detect_rename = git_config_rename("diff.renames", value);
free(value);
}
if (!git_config_get_string("merge.renames", &value)) {
o->merge_detect_rename = git_config_rename("merge.renames", value);
free(value);
}
git_config(git_xmerge_config, NULL);
}
void init_merge_options(struct merge_options *o)
{
const char *merge_verbosity;
memset(o, 0, sizeof(struct merge_options));
o->verbosity = 2;
o->buffer_output = 1;
o->diff_rename_limit = -1;
o->merge_rename_limit = -1;
o->renormalize = 0;
o->diff_detect_rename = -1;
o->merge_detect_rename = -1;
merge_recursive_config(o);
merge_verbosity = getenv("GIT_MERGE_VERBOSITY");
if (merge_verbosity)
o->verbosity = strtol(merge_verbosity, NULL, 10);
if (o->verbosity >= 5)
o->buffer_output = 0;
strbuf_init(&o->obuf, 0);
string_list_init(&o->df_conflict_file_set, 1);
}
int parse_merge_opt(struct merge_options *o, const char *s)
{
const char *arg;
if (!s || !*s)
return -1;
if (!strcmp(s, "ours"))
o->recursive_variant = MERGE_RECURSIVE_OURS;
else if (!strcmp(s, "theirs"))
o->recursive_variant = MERGE_RECURSIVE_THEIRS;
else if (!strcmp(s, "subtree"))
o->subtree_shift = "";
else if (skip_prefix(s, "subtree=", &arg))
o->subtree_shift = arg;
else if (!strcmp(s, "patience"))
o->xdl_opts = DIFF_WITH_ALG(o, PATIENCE_DIFF);
else if (!strcmp(s, "histogram"))
o->xdl_opts = DIFF_WITH_ALG(o, HISTOGRAM_DIFF);
else if (skip_prefix(s, "diff-algorithm=", &arg)) {
long value = parse_algorithm_value(arg);
if (value < 0)
return -1;
/* clear out previous settings */
DIFF_XDL_CLR(o, NEED_MINIMAL);
o->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
o->xdl_opts |= value;
}
else if (!strcmp(s, "ignore-space-change"))
DIFF_XDL_SET(o, IGNORE_WHITESPACE_CHANGE);
else if (!strcmp(s, "ignore-all-space"))
DIFF_XDL_SET(o, IGNORE_WHITESPACE);
else if (!strcmp(s, "ignore-space-at-eol"))
DIFF_XDL_SET(o, IGNORE_WHITESPACE_AT_EOL);
else if (!strcmp(s, "ignore-cr-at-eol"))
DIFF_XDL_SET(o, IGNORE_CR_AT_EOL);
else if (!strcmp(s, "renormalize"))
o->renormalize = 1;
else if (!strcmp(s, "no-renormalize"))
o->renormalize = 0;
else if (!strcmp(s, "no-renames"))
o->merge_detect_rename = 0;
else if (!strcmp(s, "find-renames")) {
o->merge_detect_rename = 1;
o->rename_score = 0;
}
else if (skip_prefix(s, "find-renames=", &arg) ||
skip_prefix(s, "rename-threshold=", &arg)) {
if ((o->rename_score = parse_rename_score(&arg)) == -1 || *arg != 0)
return -1;
o->merge_detect_rename = 1;
}
else
return -1;
return 0;
}
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