From dc615de8610c807633c63313937056bf45df0b8f Mon Sep 17 00:00:00 2001 From: Ronnie Sahlberg Date: Fri, 20 Jun 2014 07:42:55 -0700 Subject: [PATCH] refs.c: log_ref_write should try to return meaningful errno MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Making errno from write_ref_sha1() meaningful, which should fix * a bug in "git checkout -b" where it prints strerror(errno)  despite errno possibly being zero or clobbered * a bug in "git fetch"'s s_update_ref, which trusts the result of an  errno == ENOTDIR check to detect D/F conflicts Signed-off-by: Ronnie Sahlberg Signed-off-by: Junio C Hamano Acked-by: Michael Haggerty --- refs.c | 28 +++++++++++++++++++++++----- 1 file changed, 23 insertions(+), 5 deletions(-) diff --git a/refs.c b/refs.c index 211429df06..61570c9036 100644 --- a/refs.c +++ b/refs.c @@ -2859,8 +2859,19 @@ static int log_ref_write(const char *refname, const unsigned char *old_sha1, len += copy_msg(logrec + len - 1, msg) - 1; written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; free(logrec); - if (close(logfd) != 0 || written != len) - return error("Unable to append to %s", log_file); + if (written != len) { + int save_errno = errno; + close(logfd); + error("Unable to append to %s", log_file); + errno = save_errno; + return -1; + } + if (close(logfd)) { + int save_errno = errno; + error("Unable to append to %s", log_file); + errno = save_errno; + return -1; + } return 0; } @@ -2869,14 +2880,17 @@ static int is_branch(const char *refname) return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/"); } +/* This function must return a meaningful errno */ int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1, const char *logmsg) { static char term = '\n'; struct object *o; - if (!lock) + if (!lock) { + errno = EINVAL; return -1; + } if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { unlock_ref(lock); return 0; @@ -2886,19 +2900,23 @@ int write_ref_sha1(struct ref_lock *lock, error("Trying to write ref %s with nonexistent object %s", lock->ref_name, sha1_to_hex(sha1)); unlock_ref(lock); + errno = EINVAL; return -1; } if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { error("Trying to write non-commit object %s to branch %s", sha1_to_hex(sha1), lock->ref_name); unlock_ref(lock); + errno = EINVAL; return -1; } if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || - write_in_full(lock->lock_fd, &term, 1) != 1 - || close_ref(lock) < 0) { + write_in_full(lock->lock_fd, &term, 1) != 1 || + close_ref(lock) < 0) { + int save_errno = errno; error("Couldn't write %s", lock->lk->filename); unlock_ref(lock); + errno = save_errno; return -1; } clear_loose_ref_cache(&ref_cache); -- 2.11.4.GIT