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authorRonnie Sahlberg <sahlberg@google.com>2014-06-20 07:42:48 -0700
committerJunio C Hamano <gitster@pobox.com>2014-07-14 11:54:41 -0700
commit447ff1bf0acf9a1d7d2dc3aed032c209f105fb8a (patch)
treede6ade85f9d825f1300f06eda4a7e1627c676d64
parent6af926e8bcab15b42faeee9f2fe1c69b5fea1b15 (diff)
downloadgit-447ff1bf0acf9a1d7d2dc3aed032c209f105fb8a.tar.gz
git-447ff1bf0acf9a1d7d2dc3aed032c209f105fb8a.tar.xz
lockfile.c: make lock_file return a meaningful errno on failurei
Making errno when returning from lock_file() meaningful, which should fix * an existing almost-bug in lock_ref_sha1_basic where it assumes errno==ENOENT is meaningful and could waste some work on retries * an existing bug in repack_without_refs where it prints strerror(errno) and picks advice based on errno, despite errno potentially being zero and potentially having been clobbered by that point Signed-off-by: Ronnie Sahlberg <sahlberg@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> Acked-by: Michael Haggerty <mhagger@alum.mit.edu>
-rw-r--r--lockfile.c17
-rw-r--r--refs.c1
-rw-r--r--refs.h1
3 files changed, 14 insertions, 5 deletions
diff --git a/lockfile.c b/lockfile.c
index 464031bf1..a921d77af 100644
--- a/lockfile.c
+++ b/lockfile.c
@@ -121,7 +121,7 @@ static char *resolve_symlink(char *p, size_t s)
return p;
}
-
+/* Make sure errno contains a meaningful value on error */
static int lock_file(struct lock_file *lk, const char *path, int flags)
{
/*
@@ -130,8 +130,10 @@ static int lock_file(struct lock_file *lk, const char *path, int flags)
*/
static const size_t max_path_len = sizeof(lk->filename) - 5;
- if (strlen(path) >= max_path_len)
+ if (strlen(path) >= max_path_len) {
+ errno = ENAMETOOLONG;
return -1;
+ }
strcpy(lk->filename, path);
if (!(flags & LOCK_NODEREF))
resolve_symlink(lk->filename, max_path_len);
@@ -148,9 +150,13 @@ static int lock_file(struct lock_file *lk, const char *path, int flags)
lock_file_list = lk;
lk->on_list = 1;
}
- if (adjust_shared_perm(lk->filename))
- return error("cannot fix permission bits on %s",
- lk->filename);
+ if (adjust_shared_perm(lk->filename)) {
+ int save_errno = errno;
+ error("cannot fix permission bits on %s",
+ lk->filename);
+ errno = save_errno;
+ return -1;
+ }
}
else
lk->filename[0] = 0;
@@ -188,6 +194,7 @@ NORETURN void unable_to_lock_index_die(const char *path, int err)
die("%s", buf.buf);
}
+/* This should return a meaningful errno on failure */
int hold_lock_file_for_update(struct lock_file *lk, const char *path, int flags)
{
int fd = lock_file(lk, path, flags);
diff --git a/refs.c b/refs.c
index db0560259..e9d53e4a5 100644
--- a/refs.c
+++ b/refs.c
@@ -2212,6 +2212,7 @@ static int write_packed_entry_fn(struct ref_entry *entry, void *cb_data)
return 0;
}
+/* This should return a meaningful errno on failure */
int lock_packed_refs(int flags)
{
struct packed_ref_cache *packed_ref_cache;
diff --git a/refs.h b/refs.h
index 09d356411..64f25d99a 100644
--- a/refs.h
+++ b/refs.h
@@ -82,6 +82,7 @@ extern void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct st
/*
* Lock the packed-refs file for writing. Flags is passed to
* hold_lock_file_for_update(). Return 0 on success.
+ * Errno is set to something meaningful on error.
*/
extern int lock_packed_refs(int flags);