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 lead 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@xxxxxxxxx>
---
commit.h | 2 ++
fetch-pack.c | 69 +++++++++++++++++++++++++--------------------------
git.c | 5 ++++
shallow.c | 45 +++++++++++++++++++++++++++++++--
t/t5500-fetch-pack.sh | 7 ++++++
5 files changed, 91 insertions(+), 37 deletions(-)
diff --git a/commit.h b/commit.h
index 67bd509..6e9c7cd 100644
--- a/commit.h
+++ b/commit.h
@@ -176,6 +176,8 @@ extern int for_each_commit_graft(each_commit_graft_fn, void *);
extern int is_repository_shallow(void);
extern struct commit_list *get_shallow_commits(struct object_array *heads,
int depth, int shallow_flag, int not_shallow_flag);
+extern void check_shallow_file_for_update(void);
+extern void set_alternate_shallow_file(const char *path);
int is_descendant_of(struct commit *, struct commit_list *);
int in_merge_bases(struct commit *, struct commit *);
diff --git a/fetch-pack.c b/fetch-pack.c
index f156dd4..1ca4f6b 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 +786,23 @@ 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
+ 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 +882,8 @@ 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 +962,9 @@ 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);
@@ -955,34 +975,13 @@ 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);
+ struct stat st;
+ if (!fstat(shallow_lock.fd, &st) &&
+ st.st_size == 0) {
+ unlink_or_warn(git_path("shallow"));
+ rollback_lock_file(&shallow_lock);
+ } else
+ commit_lock_file(&shallow_lock);
}
reprepare_packed_git();
diff --git a/git.c b/git.c
index 1ada169..6450a38 100644
--- a/git.c
+++ b/git.c
@@ -4,6 +4,7 @@
#include "help.h"
#include "quote.h"
#include "run-command.h"
+#include "commit.h"
const char git_usage_string[] =
"git [--version] [--help] [-c name=value]\n"
@@ -146,6 +147,10 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
if (envchanged)
*envchanged = 1;
+ } else if (!strcmp(cmd, "--shallow-file")) {
+ (*argv)++;
+ (*argc)--;
+ set_alternate_shallow_file((*argv)[0]);
} else {
fprintf(stderr, "Unknown option: %s\n", cmd);
usage(git_usage_string);
diff --git a/shallow.c b/shallow.c
index 6be915f..bdae988 100644
--- a/shallow.c
+++ b/shallow.c
@@ -3,6 +3,16 @@
#include "tag.h"
static int is_shallow = -1;
+static struct stat shallow_stat;
+static char *alternate_shallow_file;
+
+void set_alternate_shallow_file(const char *path)
+{
+ if (is_shallow != -1)
+ die("BUG: is_repository_shallow must not be called before set_alternate_shallow_file");
+ free(alternate_shallow_file);
+ alternate_shallow_file = path ? xstrdup(path) : NULL;
+}
int register_shallow(const unsigned char *sha1)
{
@@ -21,12 +31,21 @@ int is_repository_shallow(void)
{
FILE *fp;
char buf[1024];
+ const char *path = alternate_shallow_file;
if (is_shallow >= 0)
return is_shallow;
- fp = fopen(git_path("shallow"), "r");
- if (!fp) {
+ if (!path)
+ path = git_path("shallow");
+ /*
+ * fetch-pack set '--shallow-file ""' as an indicator that no
+ * shallow file should be used. We could just open it and it
+ * will likely fail. But let's do an explicit check instead.
+ */
+ if (!*path ||
+ stat(path, &shallow_stat) ||
+ (fp = fopen(path, "r")) == NULL) {
is_shallow = 0;
return is_shallow;
}
@@ -108,3 +127,25 @@ struct commit_list *get_shallow_commits(struct object_array *heads, int depth,
return result;
}
+
+void check_shallow_file_for_update(void)
+{
+ struct stat st;
+
+ if (getenv("GIT_SHALLOW_FILE"))
+ die("GIT_SHALLOW_FILE should not be manually set");
+
+ if (!is_shallow)
+ return;
+ else if (is_shallow == -1)
+ die("BUG: shallow must be initialized by now");
+
+ if (stat(git_path("shallow"), &st))
+ die("shallow file was removed during fetch");
+ else if (st.st_mtime != shallow_stat.st_mtime
+#ifdef USE_NSEC
+ || ST_MTIME_NSEC(st) != ST_MTIME_NSEC(shallow_stat)
+#endif
+ )
+ die("shallow file was changed during fetch");
+}
diff --git a/t/t5500-fetch-pack.sh b/t/t5500-fetch-pack.sh
index d574085..557b073 100755
--- a/t/t5500-fetch-pack.sh
+++ b/t/t5500-fetch-pack.sh
@@ -135,6 +135,13 @@ test_expect_success 'clone shallow depth 1' '
test "`git --git-dir=shallow0/.git rev-list --count HEAD`" = 1
'
+test_expect_success 'clone shallow depth 1 with fsck' '
+ git config --global fetch.fsckobjects true &&
+ git clone --no-single-branch --depth 1 "file://$(pwd)/." shallow0fsck &&
+ test "`git --git-dir=shallow0fsck/.git rev-list --count HEAD`" = 1 &&
+ git config --global --unset fetch.fsckobjects
+'
+
test_expect_success 'clone shallow' '
git clone --no-single-branch --depth 2 "file://$(pwd)/." shallow
'
--
1.8.2.83.gc99314b
--
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