Teach fsck to not treat missing promisor objects indirectly pointed to
by refs as an error when extensions.partialclone is set.

Signed-off-by: Jonathan Tan <jonathanta...@google.com>
---
 builtin/fsck.c           | 11 +++++++++++
 t/t0410-partial-clone.sh | 23 +++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/builtin/fsck.c b/builtin/fsck.c
index f1529527b..4492a4fab 100644
--- a/builtin/fsck.c
+++ b/builtin/fsck.c
@@ -149,6 +149,15 @@ static int mark_object(struct object *obj, int type, void 
*data, struct fsck_opt
        if (obj->flags & REACHABLE)
                return 0;
        obj->flags |= REACHABLE;
+
+       if (is_promisor_object(&obj->oid))
+               /*
+                * Further recursion does not need to be performed on this
+                * object since it is a promisor object (so it does not need to
+                * be added to "pending").
+                */
+               return 0;
+
        if (!(obj->flags & HAS_OBJ)) {
                if (parent && !has_object_file(&obj->oid)) {
                        printf("broken link from %7s %s\n",
@@ -213,6 +222,8 @@ static void check_reachable_object(struct object *obj)
         * do a full fsck
         */
        if (!(obj->flags & HAS_OBJ)) {
+               if (is_promisor_object(&obj->oid))
+                       return;
                if (has_sha1_pack(obj->oid.hash))
                        return; /* it is in pack - forget about it */
                printf("missing %s %s\n", printable_type(obj),
diff --git a/t/t0410-partial-clone.sh b/t/t0410-partial-clone.sh
index bf75162c1..4f9931f9b 100755
--- a/t/t0410-partial-clone.sh
+++ b/t/t0410-partial-clone.sh
@@ -102,4 +102,27 @@ test_expect_success 'missing ref object, but promised, 
passes fsck' '
        git -C repo fsck
 '
 
+test_expect_success 'missing object, but promised, passes fsck' '
+       rm -rf repo &&
+       test_create_repo repo &&
+       test_commit -C repo 1 &&
+       test_commit -C repo 2 &&
+       test_commit -C repo 3 &&
+       git -C repo tag -a annotated_tag -m "annotated tag" &&
+
+       C=$(git -C repo rev-parse 1) &&
+       T=$(git -C repo rev-parse 2^{tree}) &&
+       B=$(git hash-object repo/3.t) &&
+       AT=$(git -C repo rev-parse annotated_tag) &&
+
+       promise_and_delete "$C" &&
+       promise_and_delete "$T" &&
+       promise_and_delete "$B" &&
+       promise_and_delete "$AT" &&
+
+       git -C repo config core.repositoryformatversion 1 &&
+       git -C repo config extensions.partialclone "arbitrary string" &&
+       git -C repo fsck
+'
+
 test_done
-- 
2.14.2.822.g60be5d43e6-goog

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