lock_ref_sha1_basic(): do not set force_write for missing references

If a reference is missing, its SHA-1 will be null_sha1, which can't
possibly match a new value that ref_transaction_commit() is trying to
update it to. So there is no need to set force_write in this scenario.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Reviewed-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/refs.c b/refs.c
index 651e37e127dd4cc2d93772678c74a8a5304c3049..b6a2535fd07425a391e278e96051b4ed870c4f51 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -2259,7 +2259,6 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname,
        int type, lflags;
        int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
        int resolve_flags = 0;
-       int missing = 0;
        int attempts_remaining = 3;
 
        lock = xcalloc(1, sizeof(struct ref_lock));
@@ -2298,13 +2297,13 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname,
                        orig_refname, 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 the ref did not exist and we are creating it, make sure
+        * there is no existing packed ref whose name begins with our
+        * refname, nor a packed ref whose name is a proper prefix of
+        * our refname.
         */
-       if (missing &&
+       if (is_null_sha1(lock->old_sha1) &&
             !is_refname_available(refname, skip, get_packed_refs(&ref_cache))) {
                last_errno = ENOTDIR;
                goto error_return;
@@ -2320,8 +2319,6 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname,
        lock->ref_name = xstrdup(refname);
        lock->orig_ref_name = xstrdup(orig_refname);
        ref_file = git_path("%s", refname);
-       if (missing)
-               lock->force_write = 1;
        if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
                lock->force_write = 1;