In 7fbbcb21b1 ("diff: batch fetching of missing blobs", 2019-04-08),
diff was taught to batch the fetching of missing objects when operating
on a partial clone, but was not taught to refrain from fetching
GITLINKs. Teach diff to check if an object is a GITLINK before including
it in the set to be fetched.
(As stated in the commit message of that commit, unpack-trees was also
taught a similar thing prior, but unpack-trees correctly checks for
GITLINK before including objects in the set to be fetched.)
---
One of my colleagues noticed this when switching branches in a
superproject with a dirty working tree (hence triggering the diff
mechanism). The test I included in this commit tests a simpler use case,
but I've verified that this solves my colleague's case too.
---
diff.c | 1 +
t/t4067-diff-partial-clone.sh | 31 +++++++++++++++++++++++++++++++
2 files changed, 32 insertions(+)
diff --git a/diff.c b/diff.c
index efe42b341a..e28b463f57 100644
--- a/diff.c
+++ b/diff.c
@@ -6512,6 +6512,7 @@ static void add_if_missing(struct repository *r,
const struct diff_filespec *filespec)
{
if (filespec && filespec->oid_valid &&
+ !S_ISGITLINK(filespec->mode) &&
oid_object_info_extended(r, &filespec->oid, NULL,
OBJECT_INFO_FOR_PREFETCH))
oid_array_append(to_fetch, &filespec->oid);
diff --git a/t/t4067-diff-partial-clone.sh b/t/t4067-diff-partial-clone.sh
index 90c8fb2901..4831ad35e6 100755
--- a/t/t4067-diff-partial-clone.sh
+++ b/t/t4067-diff-partial-clone.sh
@@ -75,6 +75,37 @@ test_expect_success 'diff skips same-OID blobs' '
! grep "want $(cat hash-b)" trace
'
+test_expect_success 'when fetching missing objects, diff skips GITLINKs' '
+ test_when_finished "rm -rf sub server client trace" &&
+
+ test_create_repo sub &&
+ test_commit -C sub first &&
+
+ test_create_repo server &&
+ echo a >server/a &&
+ git -C server add a &&
+ git -C server submodule add "file://$(pwd)/sub" &&
+ git -C server commit -m x &&
+
+ test_commit -C server/sub second &&
+ echo another-a >server/a &&
+ git -C server add a sub &&
+ git -C server commit -m x &&
+
+ test_config -C server uploadpack.allowfilter 1 &&
+ test_config -C server uploadpack.allowanysha1inwant 1 &&
+ git clone --bare --filter=blob:limit=0 "file://$(pwd)/server" client &&
+
+ echo a | git hash-object --stdin >hash-old-a &&
+ echo another-a | git hash-object --stdin >hash-new-a &&
+
+ # Ensure that a and another-a are fetched, and check (by successful
+ # execution of the diff) that no invalid OIDs are sent.
+ GIT_TRACE_PACKET="$(pwd)/trace" git -C client diff HEAD^ HEAD &&
+ grep "want $(cat hash-old-a)" trace &&
+ grep "want $(cat hash-new-a)" trace
+'
+
test_expect_success 'diff with rename detection batches blobs' '
test_when_finished "rm -rf server client trace" &&
--
2.23.0.rc1.153.gdeed80330f-goog
