[PATCH v18 12/48] refs.c: commit_packed_refs to return a meaningful errno on failure
From: Ronnie Sahlberg <hidden>
Date: 2016-06-15 23:01:39
Subsystem:
the rest · Maintainer:
Linus Torvalds
Making errno when returning from commit_packed_refs() meaningful, which should fix * a bug in "git clone" where it prints strerror(errno) based on errno, despite errno possibly being zero and potentially having been clobbered by that point * the same kind of bug in "git pack-refs" and prepares for repack_without_refs() to get a meaningful error message when commit_packed_refs() fails without falling into the same bug. Signed-off-by: Ronnie Sahlberg <redacted> --- refs.c | 10 +++++++++- refs.h | 1 + 2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/refs.c b/refs.c
index cc69581..7a815be 100644
--- a/refs.c
+++ b/refs.c@@ -2239,11 +2239,16 @@ int lock_packed_refs(int flags) return 0; } +/* + * Commit the packed refs changes. + * On error we must make sure that errno contains a meaningful value. + */ int commit_packed_refs(void) { struct packed_ref_cache *packed_ref_cache = get_packed_ref_cache(&ref_cache); int error = 0; + int save_errno = 0; if (!packed_ref_cache->lock) die("internal error: packed-refs not locked");
@@ -2253,10 +2258,13 @@ int commit_packed_refs(void) do_for_each_entry_in_dir(get_packed_ref_dir(packed_ref_cache), 0, write_packed_entry_fn, &packed_ref_cache->lock->fd); - if (commit_lock_file(packed_ref_cache->lock)) + if (commit_lock_file(packed_ref_cache->lock)) { + save_errno = errno; error = -1; + } packed_ref_cache->lock = NULL; release_packed_ref_cache(packed_ref_cache); + errno = save_errno; return error; }
diff --git a/refs.h b/refs.h
index af4fcdc..593a459 100644
--- a/refs.h
+++ b/refs.h@@ -98,6 +98,7 @@ extern void add_packed_ref(const char *refname, const unsigned char *sha1); * Write the current version of the packed refs cache from memory to * disk. The packed-refs file must already be locked for writing (see * lock_packed_refs()). Return zero on success. + * Sets errno to something meaningful on error. */ extern int commit_packed_refs(void);
--
2.0.0.438.gec92e5c