revision: tolerate promised targets of tags

In handle_commit(), it is fatal for an annotated tag to point to a
non-existent object. --exclude-promisor-objects should relax this rule
and allow non-existent objects that are promisor objects, but this is
not the case. Update handle_commit() to tolerate this situation.

This was observed when cloning from a repository with an annotated tag
pointing to a blob. The test included in this patch demonstrates this
case.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/revision.c b/revision.c
index 1b37da988d2dc8e8b357e4375583a072d5fed82a..95546e6d446e3df7ccebb366ec3e5c04bd4a2f9f 100644 (file)
--- a/revision.c
+++ b/revision.c
@@ -248,6 +248,9 @@ static struct commit *handle_commit(struct rev_info *revs,
                if (!object) {
                        if (revs->ignore_missing_links || (flags & UNINTERESTING))
                                return NULL;
+                       if (revs->exclude_promisor_objects &&
+                           is_promisor_object(&tag->tagged->oid))
+                               return NULL;
                        die("bad object %s", oid_to_hex(&tag->tagged->oid));
                }
                object->flags |= flags;

diff --git a/t/t5616-partial-clone.sh b/t/t5616-partial-clone.sh
index 44d8e80171a646bc6b4172a38763ca6355c94901..e8dfeafe73dad902b5ed97426068b991f3511cf7 100755 (executable)
--- a/t/t5616-partial-clone.sh
+++ b/t/t5616-partial-clone.sh
@@ -216,6 +216,45 @@ test_expect_success 'upon cloning, check that all refs point to objects' '
        ! test -e "$HTTPD_ROOT_PATH/one-time-sed"
 '
 
+test_expect_success 'when partial cloning, tolerate server not sending target of tag' '
+       SERVER="$HTTPD_DOCUMENT_ROOT_PATH/server" &&
+       rm -rf "$SERVER" repo &&
+       test_create_repo "$SERVER" &&
+       test_commit -C "$SERVER" foo &&
+       test_config -C "$SERVER" uploadpack.allowfilter 1 &&
+       test_config -C "$SERVER" uploadpack.allowanysha1inwant 1 &&
+
+       # Create an annotated tag pointing to a blob.
+       BLOB=$(echo blob-contents | git -C "$SERVER" hash-object --stdin -w) &&
+       git -C "$SERVER" tag -m message -a myblob "$BLOB" &&
+
+       # Craft a packfile including the tag, but not the blob it points to.
+       printf "%s\n%s\n--not\n%s\n" \
+               $(git -C "$SERVER" rev-parse HEAD) \
+               $(git -C "$SERVER" rev-parse myblob) \
+               $(git -C "$SERVER" rev-parse myblob^{blob}) |
+               git -C "$SERVER" pack-objects --thin --stdout >incomplete.pack &&
+
+       # Replace the existing packfile with the crafted one. The protocol
+       # requires that the packfile be sent in sideband 1, hence the extra
+       # \x01 byte at the beginning.
+       printf "1,/packfile/!c %04x\\\\x01%s0000" \
+               "$(($(wc -c <incomplete.pack) + 5))" \
+               "$(sed_escape <incomplete.pack)" \
+               >"$HTTPD_ROOT_PATH/one-time-sed" &&
+
+       # Use protocol v2 because the sed command looks for the "packfile"
+       # section header.
+       test_config -C "$SERVER" protocol.version 2 &&
+
+       # Exercise to make sure it works.
+       git -c protocol.version=2 clone \
+               --filter=blob:none $HTTPD_URL/one_time_sed/server repo &&
+
+       # Ensure that the one-time-sed script was used.
+       ! test -e "$HTTPD_ROOT_PATH/one-time-sed"
+'
+
 stop_httpd
 
 test_done