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authorNguyễn Thái Ngọc Duy <pclouds@gmail.com>2013-05-26 08:16:15 +0700
committerJunio C Hamano <gitster@pobox.com>2013-05-28 08:06:08 -0700
commit6035d6aad8ca11954c0d7821f6f3e7c047039c8f (patch)
treea24924b1323fe52278be3f912b36bc78eed7be22 /fetch-pack.c
parent0781aa4766ed88d620ea060c7d775ca806ebfa93 (diff)
downloadgit-6035d6aad8ca11954c0d7821f6f3e7c047039c8f.tar.gz
fetch-pack: prepare updated shallow file before fetching the pack
index-pack --strict looks up and follows parent commits. If shallow information is not ready by the time index-pack is run, index-pack may be led to non-existent objects. Make fetch-pack save shallow file to disk before invoking index-pack. git learns new global option --shallow-file to pass on the alternate shallow file path. Undocumented (and not even support --shallow-file= syntax) because it's unlikely to be used again elsewhere. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'fetch-pack.c')
-rw-r--r--fetch-pack.c73
1 files changed, 37 insertions, 36 deletions
diff --git a/fetch-pack.c b/fetch-pack.c
index f156dd4fac..6b5467c6de 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -20,6 +20,8 @@ static int no_done;
static int fetch_fsck_objects = -1;
static int transfer_fsck_objects = -1;
static int agent_supported;
+static struct lock_file shallow_lock;
+static const char *alternate_shallow_file;
#define COMPLETE (1U << 0)
#define COMMON (1U << 1)
@@ -683,7 +685,7 @@ static int get_pack(struct fetch_pack_args *args,
int xd[2], char **pack_lockfile)
{
struct async demux;
- const char *argv[20];
+ const char *argv[22];
char keep_arg[256];
char hdr_arg[256];
const char **av;
@@ -724,6 +726,11 @@ static int get_pack(struct fetch_pack_args *args,
do_keep = 1;
}
+ if (alternate_shallow_file) {
+ *av++ = "--shallow-file";
+ *av++ = alternate_shallow_file;
+ }
+
if (do_keep) {
if (pack_lockfile)
cmd.out = -1;
@@ -779,6 +786,27 @@ static int cmp_ref_by_name(const void *a_, const void *b_)
return strcmp(a->name, b->name);
}
+static void setup_alternate_shallow(void)
+{
+ struct strbuf sb = STRBUF_INIT;
+ int fd;
+
+ check_shallow_file_for_update();
+ fd = hold_lock_file_for_update(&shallow_lock, git_path("shallow"),
+ LOCK_DIE_ON_ERROR);
+ if (write_shallow_commits(&sb, 0)) {
+ if (write_in_full(fd, sb.buf, sb.len) != sb.len)
+ die_errno("failed to write to %s", shallow_lock.filename);
+ alternate_shallow_file = shallow_lock.filename;
+ } else
+ /*
+ * is_repository_shallow() sees empty string as "no
+ * shallow file".
+ */
+ alternate_shallow_file = "";
+ strbuf_release(&sb);
+}
+
static struct ref *do_fetch_pack(struct fetch_pack_args *args,
int fd[2],
const struct ref *orig_ref,
@@ -858,6 +886,8 @@ static struct ref *do_fetch_pack(struct fetch_pack_args *args,
if (args->stateless_rpc)
packet_flush(fd[1]);
+ if (args->depth > 0)
+ setup_alternate_shallow();
if (get_pack(args, fd, pack_lockfile))
die("git fetch-pack: fetch failed.");
@@ -936,15 +966,9 @@ struct ref *fetch_pack(struct fetch_pack_args *args,
struct ref **sought, int nr_sought,
char **pack_lockfile)
{
- struct stat st;
struct ref *ref_cpy;
fetch_pack_setup();
- if (args->depth > 0) {
- if (stat(git_path("shallow"), &st))
- st.st_mtime = 0;
- }
-
if (nr_sought)
nr_sought = remove_duplicates_in_refs(sought, nr_sought);
@@ -954,35 +978,12 @@ struct ref *fetch_pack(struct fetch_pack_args *args,
}
ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought, pack_lockfile);
- if (args->depth > 0) {
- static struct lock_file lock;
- struct cache_time mtime;
- struct strbuf sb = STRBUF_INIT;
- char *shallow = git_path("shallow");
- int fd;
-
- mtime.sec = st.st_mtime;
- mtime.nsec = ST_MTIME_NSEC(st);
- if (stat(shallow, &st)) {
- if (mtime.sec)
- die("shallow file was removed during fetch");
- } else if (st.st_mtime != mtime.sec
-#ifdef USE_NSEC
- || ST_MTIME_NSEC(st) != mtime.nsec
-#endif
- )
- die("shallow file was changed during fetch");
-
- fd = hold_lock_file_for_update(&lock, shallow,
- LOCK_DIE_ON_ERROR);
- if (!write_shallow_commits(&sb, 0)
- || write_in_full(fd, sb.buf, sb.len) != sb.len) {
- unlink_or_warn(shallow);
- rollback_lock_file(&lock);
- } else {
- commit_lock_file(&lock);
- }
- strbuf_release(&sb);
+ if (alternate_shallow_file) {
+ if (*alternate_shallow_file == '\0') { /* --unshallow */
+ unlink_or_warn(git_path("shallow"));
+ rollback_lock_file(&shallow_lock);
+ } else
+ commit_lock_file(&shallow_lock);
}
reprepare_packed_git();