bulk-checkin: replace fast-import based implementation
This extends the earlier approach to stream a large file directly from the filesystem to its own packfile, and allows "git add" to send large files directly into a single pack. Older code used to spawn fast-import, but the new bulk-checkin API replaces it. Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano
parent
6c52614864
commit
568508e765
2
Makefile
2
Makefile
@ -505,6 +505,7 @@ LIB_H += argv-array.h
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LIB_H += attr.h
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LIB_H += blob.h
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LIB_H += builtin.h
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LIB_H += bulk-checkin.h
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LIB_H += cache.h
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LIB_H += cache-tree.h
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LIB_H += color.h
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@ -591,6 +592,7 @@ LIB_OBJS += base85.o
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LIB_OBJS += bisect.o
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LIB_OBJS += blob.o
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LIB_OBJS += branch.o
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LIB_OBJS += bulk-checkin.o
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LIB_OBJS += bundle.o
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LIB_OBJS += cache-tree.o
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LIB_OBJS += color.o
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@ -13,6 +13,7 @@
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#include "diff.h"
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#include "diffcore.h"
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#include "revision.h"
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#include "bulk-checkin.h"
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static const char * const builtin_add_usage[] = {
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"git add [options] [--] <filepattern>...",
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@ -458,11 +459,15 @@ int cmd_add(int argc, const char **argv, const char *prefix)
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free(seen);
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}
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plug_bulk_checkin();
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exit_status |= add_files_to_cache(prefix, pathspec, flags);
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if (add_new_files)
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exit_status |= add_files(&dir, flags);
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unplug_bulk_checkin();
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finish:
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if (active_cache_changed) {
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if (write_cache(newfd, active_cache, active_nr) ||
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@ -76,7 +76,7 @@ static struct pack_idx_option pack_idx_opts;
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static const char *base_name;
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static int progress = 1;
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static int window = 10;
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static unsigned long pack_size_limit, pack_size_limit_cfg;
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static unsigned long pack_size_limit;
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static int depth = 50;
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static int delta_search_threads;
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static int pack_to_stdout;
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@ -2009,10 +2009,6 @@ static int git_pack_config(const char *k, const char *v, void *cb)
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pack_idx_opts.version);
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return 0;
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}
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if (!strcmp(k, "pack.packsizelimit")) {
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pack_size_limit_cfg = git_config_ulong(k, v);
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return 0;
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}
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return git_default_config(k, v, cb);
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}
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275
bulk-checkin.c
Normal file
275
bulk-checkin.c
Normal file
@ -0,0 +1,275 @@
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/*
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* Copyright (c) 2011, Google Inc.
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*/
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#include "bulk-checkin.h"
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#include "csum-file.h"
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#include "pack.h"
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static int pack_compression_level = Z_DEFAULT_COMPRESSION;
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static struct bulk_checkin_state {
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unsigned plugged:1;
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char *pack_tmp_name;
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struct sha1file *f;
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off_t offset;
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struct pack_idx_option pack_idx_opts;
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struct pack_idx_entry **written;
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uint32_t alloc_written;
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uint32_t nr_written;
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} state;
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static void finish_bulk_checkin(struct bulk_checkin_state *state)
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{
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unsigned char sha1[20];
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char packname[PATH_MAX];
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int i;
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if (!state->f)
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return;
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if (state->nr_written == 0) {
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close(state->f->fd);
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unlink(state->pack_tmp_name);
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goto clear_exit;
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} else if (state->nr_written == 1) {
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sha1close(state->f, sha1, CSUM_FSYNC);
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} else {
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int fd = sha1close(state->f, sha1, 0);
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fixup_pack_header_footer(fd, sha1, state->pack_tmp_name,
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state->nr_written, sha1,
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state->offset);
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close(fd);
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}
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sprintf(packname, "%s/pack/pack-", get_object_directory());
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finish_tmp_packfile(packname, state->pack_tmp_name,
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state->written, state->nr_written,
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&state->pack_idx_opts, sha1);
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for (i = 0; i < state->nr_written; i++)
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free(state->written[i]);
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clear_exit:
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free(state->written);
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memset(state, 0, sizeof(*state));
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/* Make objects we just wrote available to ourselves */
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reprepare_packed_git();
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}
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static int already_written(struct bulk_checkin_state *state, unsigned char sha1[])
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{
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int i;
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/* The object may already exist in the repository */
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if (has_sha1_file(sha1))
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return 1;
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/* Might want to keep the list sorted */
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for (i = 0; i < state->nr_written; i++)
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if (!hashcmp(state->written[i]->sha1, sha1))
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return 1;
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/* This is a new object we need to keep */
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return 0;
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}
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/*
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* Read the contents from fd for size bytes, streaming it to the
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* packfile in state while updating the hash in ctx. Signal a failure
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* by returning a negative value when the resulting pack would exceed
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* the pack size limit and this is not the first object in the pack,
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* so that the caller can discard what we wrote from the current pack
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* by truncating it and opening a new one. The caller will then call
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* us again after rewinding the input fd.
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*
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* The already_hashed_to pointer is kept untouched by the caller to
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* make sure we do not hash the same byte when we are called
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* again. This way, the caller does not have to checkpoint its hash
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* status before calling us just in case we ask it to call us again
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* with a new pack.
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*/
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static int stream_to_pack(struct bulk_checkin_state *state,
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git_SHA_CTX *ctx, off_t *already_hashed_to,
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int fd, size_t size, enum object_type type,
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const char *path, unsigned flags)
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{
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git_zstream s;
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unsigned char obuf[16384];
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unsigned hdrlen;
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int status = Z_OK;
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int write_object = (flags & HASH_WRITE_OBJECT);
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off_t offset = 0;
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memset(&s, 0, sizeof(s));
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git_deflate_init(&s, pack_compression_level);
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hdrlen = encode_in_pack_object_header(type, size, obuf);
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s.next_out = obuf + hdrlen;
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s.avail_out = sizeof(obuf) - hdrlen;
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while (status != Z_STREAM_END) {
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unsigned char ibuf[16384];
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if (size && !s.avail_in) {
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ssize_t rsize = size < sizeof(ibuf) ? size : sizeof(ibuf);
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if (xread(fd, ibuf, rsize) != rsize)
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die("failed to read %d bytes from '%s'",
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(int)rsize, path);
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offset += rsize;
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if (*already_hashed_to < offset) {
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size_t hsize = offset - *already_hashed_to;
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if (rsize < hsize)
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hsize = rsize;
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if (hsize)
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git_SHA1_Update(ctx, ibuf, hsize);
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*already_hashed_to = offset;
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}
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s.next_in = ibuf;
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s.avail_in = rsize;
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size -= rsize;
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}
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status = git_deflate(&s, size ? 0 : Z_FINISH);
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if (!s.avail_out || status == Z_STREAM_END) {
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if (write_object) {
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size_t written = s.next_out - obuf;
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/* would we bust the size limit? */
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if (state->nr_written &&
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pack_size_limit_cfg &&
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pack_size_limit_cfg < state->offset + written) {
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git_deflate_abort(&s);
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return -1;
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}
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sha1write(state->f, obuf, written);
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state->offset += written;
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}
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s.next_out = obuf;
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s.avail_out = sizeof(obuf);
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}
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switch (status) {
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case Z_OK:
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case Z_BUF_ERROR:
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case Z_STREAM_END:
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continue;
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default:
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die("unexpected deflate failure: %d", status);
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}
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}
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git_deflate_end(&s);
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return 0;
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}
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/* Lazily create backing packfile for the state */
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static void prepare_to_stream(struct bulk_checkin_state *state,
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unsigned flags)
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{
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if (!(flags & HASH_WRITE_OBJECT) || state->f)
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return;
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state->f = create_tmp_packfile(&state->pack_tmp_name);
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reset_pack_idx_option(&state->pack_idx_opts);
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/* Pretend we are going to write only one object */
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state->offset = write_pack_header(state->f, 1);
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if (!state->offset)
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die_errno("unable to write pack header");
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}
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static int deflate_to_pack(struct bulk_checkin_state *state,
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unsigned char result_sha1[],
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int fd, size_t size,
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enum object_type type, const char *path,
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unsigned flags)
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{
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off_t seekback, already_hashed_to;
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git_SHA_CTX ctx;
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unsigned char obuf[16384];
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unsigned header_len;
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struct sha1file_checkpoint checkpoint;
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struct pack_idx_entry *idx = NULL;
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seekback = lseek(fd, 0, SEEK_CUR);
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if (seekback == (off_t) -1)
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return error("cannot find the current offset");
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header_len = sprintf((char *)obuf, "%s %" PRIuMAX,
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typename(type), (uintmax_t)size) + 1;
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git_SHA1_Init(&ctx);
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git_SHA1_Update(&ctx, obuf, header_len);
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/* Note: idx is non-NULL when we are writing */
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if ((flags & HASH_WRITE_OBJECT) != 0)
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idx = xcalloc(1, sizeof(*idx));
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already_hashed_to = 0;
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while (1) {
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prepare_to_stream(state, flags);
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if (idx) {
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sha1file_checkpoint(state->f, &checkpoint);
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idx->offset = state->offset;
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crc32_begin(state->f);
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}
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if (!stream_to_pack(state, &ctx, &already_hashed_to,
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fd, size, type, path, flags))
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break;
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/*
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* Writing this object to the current pack will make
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* it too big; we need to truncate it, start a new
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* pack, and write into it.
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*/
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if (!idx)
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die("BUG: should not happen");
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sha1file_truncate(state->f, &checkpoint);
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state->offset = checkpoint.offset;
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finish_bulk_checkin(state);
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if (lseek(fd, seekback, SEEK_SET) == (off_t) -1)
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return error("cannot seek back");
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}
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git_SHA1_Final(result_sha1, &ctx);
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if (!idx)
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return 0;
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idx->crc32 = crc32_end(state->f);
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if (already_written(state, result_sha1)) {
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sha1file_truncate(state->f, &checkpoint);
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state->offset = checkpoint.offset;
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free(idx);
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} else {
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hashcpy(idx->sha1, result_sha1);
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ALLOC_GROW(state->written,
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state->nr_written + 1,
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state->alloc_written);
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state->written[state->nr_written++] = idx;
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}
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return 0;
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}
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int index_bulk_checkin(unsigned char *sha1,
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int fd, size_t size, enum object_type type,
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const char *path, unsigned flags)
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{
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int status = deflate_to_pack(&state, sha1, fd, size, type,
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path, flags);
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if (!state.plugged)
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finish_bulk_checkin(&state);
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return status;
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}
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void plug_bulk_checkin(void)
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{
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state.plugged = 1;
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}
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void unplug_bulk_checkin(void)
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{
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state.plugged = 0;
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if (state.f)
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finish_bulk_checkin(&state);
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}
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16
bulk-checkin.h
Normal file
16
bulk-checkin.h
Normal file
@ -0,0 +1,16 @@
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/*
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* Copyright (c) 2011, Google Inc.
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*/
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#ifndef BULK_CHECKIN_H
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#define BULK_CHECKIN_H
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#include "cache.h"
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extern int index_bulk_checkin(unsigned char sha1[],
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int fd, size_t size, enum object_type type,
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const char *path, unsigned flags);
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extern void plug_bulk_checkin(void);
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extern void unplug_bulk_checkin(void);
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#endif
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2
cache.h
2
cache.h
@ -35,6 +35,7 @@ int git_inflate(git_zstream *, int flush);
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void git_deflate_init(git_zstream *, int level);
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void git_deflate_init_gzip(git_zstream *, int level);
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void git_deflate_end(git_zstream *);
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int git_deflate_abort(git_zstream *);
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int git_deflate_end_gently(git_zstream *);
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int git_deflate(git_zstream *, int flush);
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unsigned long git_deflate_bound(git_zstream *, unsigned long);
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@ -598,6 +599,7 @@ extern size_t packed_git_window_size;
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extern size_t packed_git_limit;
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extern size_t delta_base_cache_limit;
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extern unsigned long big_file_threshold;
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extern unsigned long pack_size_limit_cfg;
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extern int read_replace_refs;
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extern int fsync_object_files;
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extern int core_preload_index;
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4
config.c
4
config.c
@ -797,6 +797,10 @@ int git_default_config(const char *var, const char *value, void *dummy)
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return 0;
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}
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if (!strcmp(var, "pack.packsizelimit")) {
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pack_size_limit_cfg = git_config_ulong(var, value);
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return 0;
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}
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/* Add other config variables here and to Documentation/config.txt. */
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return 0;
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}
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@ -60,6 +60,7 @@ char *notes_ref_name;
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int grafts_replace_parents = 1;
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int core_apply_sparse_checkout;
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struct startup_info *startup_info;
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unsigned long pack_size_limit_cfg;
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/* Parallel index stat data preload? */
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int core_preload_index = 0;
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67
sha1_file.c
67
sha1_file.c
@ -18,6 +18,7 @@
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#include "refs.h"
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#include "pack-revindex.h"
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#include "sha1-lookup.h"
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#include "bulk-checkin.h"
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#ifndef O_NOATIME
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#if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
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@ -2679,10 +2680,8 @@ static int index_core(unsigned char *sha1, int fd, size_t size,
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}
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/*
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* This creates one packfile per large blob, because the caller
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* immediately wants the result sha1, and fast-import can report the
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* object name via marks mechanism only by closing the created
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* packfile.
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* This creates one packfile per large blob unless bulk-checkin
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* machinery is "plugged".
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*
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* This also bypasses the usual "convert-to-git" dance, and that is on
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* purpose. We could write a streaming version of the converting
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@ -2696,65 +2695,7 @@ static int index_stream(unsigned char *sha1, int fd, size_t size,
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enum object_type type, const char *path,
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unsigned flags)
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{
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struct child_process fast_import;
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char export_marks[512];
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const char *argv[] = { "fast-import", "--quiet", export_marks, NULL };
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char tmpfile[512];
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char fast_import_cmd[512];
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char buf[512];
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int len, tmpfd;
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strcpy(tmpfile, git_path("hashstream_XXXXXX"));
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tmpfd = git_mkstemp_mode(tmpfile, 0600);
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if (tmpfd < 0)
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die_errno("cannot create tempfile: %s", tmpfile);
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if (close(tmpfd))
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die_errno("cannot close tempfile: %s", tmpfile);
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sprintf(export_marks, "--export-marks=%s", tmpfile);
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memset(&fast_import, 0, sizeof(fast_import));
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fast_import.in = -1;
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fast_import.argv = argv;
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fast_import.git_cmd = 1;
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if (start_command(&fast_import))
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die_errno("index-stream: git fast-import failed");
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len = sprintf(fast_import_cmd, "blob\nmark :1\ndata %lu\n",
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(unsigned long) size);
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write_or_whine(fast_import.in, fast_import_cmd, len,
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"index-stream: feeding fast-import");
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while (size) {
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char buf[10240];
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size_t sz = size < sizeof(buf) ? size : sizeof(buf);
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ssize_t actual;
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actual = read_in_full(fd, buf, sz);
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if (actual < 0)
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die_errno("index-stream: reading input");
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if (write_in_full(fast_import.in, buf, actual) != actual)
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die_errno("index-stream: feeding fast-import");
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size -= actual;
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}
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if (close(fast_import.in))
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die_errno("index-stream: closing fast-import");
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if (finish_command(&fast_import))
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||||
die_errno("index-stream: finishing fast-import");
|
||||
|
||||
tmpfd = open(tmpfile, O_RDONLY);
|
||||
if (tmpfd < 0)
|
||||
die_errno("index-stream: cannot open fast-import mark");
|
||||
len = read(tmpfd, buf, sizeof(buf));
|
||||
if (len < 0)
|
||||
die_errno("index-stream: reading fast-import mark");
|
||||
if (close(tmpfd) < 0)
|
||||
die_errno("index-stream: closing fast-import mark");
|
||||
if (unlink(tmpfile))
|
||||
die_errno("index-stream: unlinking fast-import mark");
|
||||
if (len != 44 ||
|
||||
memcmp(":1 ", buf, 3) ||
|
||||
get_sha1_hex(buf + 3, sha1))
|
||||
die_errno("index-stream: unexpected fast-import mark: <%s>", buf);
|
||||
return 0;
|
||||
return index_bulk_checkin(sha1, fd, size, type, path, flags);
|
||||
}
|
||||
|
||||
int index_fd(unsigned char *sha1, int fd, struct stat *st,
|
||||
|
||||
@ -7,21 +7,97 @@ test_description='adding and checking out large blobs'
|
||||
|
||||
test_expect_success setup '
|
||||
git config core.bigfilethreshold 200k &&
|
||||
echo X | dd of=large bs=1k seek=2000
|
||||
echo X | dd of=large1 bs=1k seek=2000 &&
|
||||
echo X | dd of=large2 bs=1k seek=2000 &&
|
||||
echo X | dd of=large3 bs=1k seek=2000 &&
|
||||
echo Y | dd of=huge bs=1k seek=2500
|
||||
'
|
||||
|
||||
test_expect_success 'add a large file' '
|
||||
git add large &&
|
||||
# make sure we got a packfile and no loose objects
|
||||
test -f .git/objects/pack/pack-*.pack &&
|
||||
test ! -f .git/objects/??/??????????????????????????????????????
|
||||
test_expect_success 'add a large file or two' '
|
||||
git add large1 huge large2 &&
|
||||
# make sure we got a single packfile and no loose objects
|
||||
bad= count=0 idx= &&
|
||||
for p in .git/objects/pack/pack-*.pack
|
||||
do
|
||||
count=$(( $count + 1 ))
|
||||
if test -f "$p" && idx=${p%.pack}.idx && test -f "$idx"
|
||||
then
|
||||
continue
|
||||
fi
|
||||
bad=t
|
||||
done &&
|
||||
test -z "$bad" &&
|
||||
test $count = 1 &&
|
||||
cnt=$(git show-index <"$idx" | wc -l) &&
|
||||
test $cnt = 2 &&
|
||||
for l in .git/objects/??/??????????????????????????????????????
|
||||
do
|
||||
test -f "$l" || continue
|
||||
bad=t
|
||||
done &&
|
||||
test -z "$bad" &&
|
||||
|
||||
# attempt to add another copy of the same
|
||||
git add large3 &&
|
||||
bad= count=0 &&
|
||||
for p in .git/objects/pack/pack-*.pack
|
||||
do
|
||||
count=$(( $count + 1 ))
|
||||
if test -f "$p" && idx=${p%.pack}.idx && test -f "$idx"
|
||||
then
|
||||
continue
|
||||
fi
|
||||
bad=t
|
||||
done &&
|
||||
test -z "$bad" &&
|
||||
test $count = 1
|
||||
'
|
||||
|
||||
test_expect_success 'checkout a large file' '
|
||||
large=$(git rev-parse :large) &&
|
||||
git update-index --add --cacheinfo 100644 $large another &&
|
||||
large1=$(git rev-parse :large1) &&
|
||||
git update-index --add --cacheinfo 100644 $large1 another &&
|
||||
git checkout another &&
|
||||
cmp large another ;# this must not be test_cmp
|
||||
cmp large1 another ;# this must not be test_cmp
|
||||
'
|
||||
|
||||
test_expect_success 'packsize limit' '
|
||||
test_create_repo mid &&
|
||||
(
|
||||
cd mid &&
|
||||
git config core.bigfilethreshold 64k &&
|
||||
git config pack.packsizelimit 256k &&
|
||||
|
||||
# mid1 and mid2 will fit within 256k limit but
|
||||
# appending mid3 will bust the limit and will
|
||||
# result in a separate packfile.
|
||||
test-genrandom "a" $(( 66 * 1024 )) >mid1 &&
|
||||
test-genrandom "b" $(( 80 * 1024 )) >mid2 &&
|
||||
test-genrandom "c" $(( 128 * 1024 )) >mid3 &&
|
||||
git add mid1 mid2 mid3 &&
|
||||
|
||||
count=0
|
||||
for pi in .git/objects/pack/pack-*.idx
|
||||
do
|
||||
test -f "$pi" && count=$(( $count + 1 ))
|
||||
done &&
|
||||
test $count = 2 &&
|
||||
|
||||
(
|
||||
git hash-object --stdin <mid1
|
||||
git hash-object --stdin <mid2
|
||||
git hash-object --stdin <mid3
|
||||
) |
|
||||
sort >expect &&
|
||||
|
||||
for pi in .git/objects/pack/pack-*.idx
|
||||
do
|
||||
git show-index <"$pi"
|
||||
done |
|
||||
sed -e "s/^[0-9]* \([0-9a-f]*\) .*/\1/" |
|
||||
sort >actual &&
|
||||
|
||||
test_cmp expect actual
|
||||
)
|
||||
'
|
||||
|
||||
test_done
|
||||
|
||||
9
zlib.c
9
zlib.c
@ -188,13 +188,20 @@ void git_deflate_init_gzip(git_zstream *strm, int level)
|
||||
strm->z.msg ? strm->z.msg : "no message");
|
||||
}
|
||||
|
||||
void git_deflate_end(git_zstream *strm)
|
||||
int git_deflate_abort(git_zstream *strm)
|
||||
{
|
||||
int status;
|
||||
|
||||
zlib_pre_call(strm);
|
||||
status = deflateEnd(&strm->z);
|
||||
zlib_post_call(strm);
|
||||
return status;
|
||||
}
|
||||
|
||||
void git_deflate_end(git_zstream *strm)
|
||||
{
|
||||
int status = git_deflate_abort(strm);
|
||||
|
||||
if (status == Z_OK)
|
||||
return;
|
||||
error("deflateEnd: %s (%s)", zerr_to_string(status),
|
||||
|
||||
Loading…
Reference in New Issue
Block a user