do not force write of packed refs

We force writing a ref if it does not exist. Originally, we only had to look
for the ref file to check if it existed. Now we have to look for a packed ref
as well. Luckily, resolve_ref already does all the work for us.

Signed-off-by: Clemens Buchacher <drizzd@aon.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/refs.c b/refs.c
index 9e422dcccbb3d499b55df5f39612b12c3c3f52e0..7d91b670c5a923ed2e4e93a87ba40e9e93387f2b 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -788,10 +788,10 @@ static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char
        char *ref_file;
        const char *orig_ref = ref;
        struct ref_lock *lock;
-       struct stat st;
        int last_errno = 0;
        int type, lflags;
        int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
+       int missing = 0;
 
        lock = xcalloc(1, sizeof(struct ref_lock));
        lock->lock_fd = -1;
@@ -819,12 +819,13 @@ static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char
                        orig_ref, strerror(errno));
                goto error_return;
        }
+       missing = is_null_sha1(lock->old_sha1);
        /* When the ref did not exist and we are creating it,
         * make sure there is no existing ref that is packed
         * whose name begins with our refname, nor a ref whose
         * name is a proper prefix of our refname.
         */
-       if (is_null_sha1(lock->old_sha1) &&
+       if (missing &&
             !is_refname_available(ref, NULL, get_packed_refs(), 0))
                goto error_return;
 
@@ -838,7 +839,7 @@ static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char
        lock->ref_name = xstrdup(ref);
        lock->orig_ref_name = xstrdup(orig_ref);
        ref_file = git_path("%s", ref);
-       if (lstat(ref_file, &st) && errno == ENOENT)
+       if (missing)
                lock->force_write = 1;
        if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
                lock->force_write = 1;

diff --git a/t/t3210-pack-refs.sh b/t/t3210-pack-refs.sh
index 087ef75061f4d56fcb6350284d91820485249087..413019acafc98646a61e77960527f042a8f96ac6 100755 (executable)
--- a/t/t3210-pack-refs.sh
+++ b/t/t3210-pack-refs.sh
@@ -96,6 +96,13 @@ test_expect_success \
      git branch -d n/o/p &&
      git branch n'
 
+test_expect_success \
+       'see if up-to-date packed refs are preserved' \
+       'git branch q &&
+        git pack-refs --all --prune &&
+        git update-ref refs/heads/q refs/heads/q &&
+        ! test -f .git/refs/heads/q'
+
 test_expect_success 'pack, prune and repack' '
        git tag foo &&
        git pack-refs --all --prune &&