[PATCH 17/33] repack_without_ref(): silence errors for dangling packed refs

[Michael Haggerty <mhagger@alum.mit.edu>]

Stop emitting an error message for dangling packed references found
when deleting another packed reference.  See the previous commit for a
longer explanation of the issue.

Change repack_without_ref_fn() to silently ignore dangling packed
references.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
---
 refs.c               | 17 ++++++++++-------
 t/t3210-pack-refs.sh |  2 +-
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/refs.c b/refs.c
index 51f68d3..eadbc2a 100644
--- a/refs.c
+++ b/refs.c
@@ -531,15 +531,17 @@ static void sort_ref_dir(struct ref_dir *dir)
 
 /*
  * Return true iff the reference described by entry can be resolved to
- * an object in the database.  Emit a warning if the referred-to
- * object does not exist.
+ * an object in the database.  If report_errors is true, emit a
+ * warning if the referred-to object does not exist.
  */
-static int ref_resolves_to_object(struct ref_entry *entry)
+static int ref_resolves_to_object(struct ref_entry *entry, int report_errors)
 {
 	if (entry->flag & REF_ISBROKEN)
 		return 0;
 	if (!has_sha1_file(entry->u.value.sha1)) {
-		error("%s does not point to a valid object!", entry->name);
+		if (report_errors)
+			error("%s does not point to a valid object!",
+			      entry->name);
 		return 0;
 	}
 	return 1;
@@ -578,7 +580,7 @@ static int do_one_ref(struct ref_entry *entry, void *cb_data)
 		return 0;
 
 	if (!((data->flags & DO_FOR_EACH_INCLUDE_BROKEN) ||
-	      ref_resolves_to_object(entry)))
+	      ref_resolves_to_object(entry, 1)))
 		return 0;
 
 	current_ref = entry;
@@ -1897,8 +1899,9 @@ static int repack_without_ref_fn(struct ref_entry *entry, void *cb_data)
 
 	if (!strcmp(data->refname, entry->name))
 		return 0;
-	if (!ref_resolves_to_object(entry))
-		return 0; /* Skip broken refs */
+	/* Silently skip broken refs: */
+	if (!ref_resolves_to_object(entry, 0))
+		return 0;
 	len = snprintf(line, sizeof(line), "%s %s\n",
 		       sha1_to_hex(entry->u.value.sha1), entry->name);
 	/* this should not happen but just being defensive */
diff --git a/t/t3210-pack-refs.sh b/t/t3210-pack-refs.sh
index c032d88..559f602 100755
--- a/t/t3210-pack-refs.sh
+++ b/t/t3210-pack-refs.sh
@@ -142,7 +142,7 @@ test_expect_success 'delete ref with dangling packed version' '
 	test_cmp /dev/null result
 '
 
-test_expect_failure 'delete ref while another dangling packed ref' '
+test_expect_success 'delete ref while another dangling packed ref' '
 	git branch lamb &&
 	git commit --allow-empty -m "future garbage" &&
 	git pack-refs --all &&
-- 
1.8.2.1