bundle: unbundle promisor packs

In order to have a valid pack-file after unbundling a bundle that has the 'filter' capability, we need to generate a .promisor file. The bundle does not promise _where_ the objects can be found, but we can expect that these bundles will be unbundled in repositories with appropriate promisor remotes that can find those missing objects. Use the 'git index-pack --promisor=<message>' option to create this .promisor file. Add "from-bundle" as the message to help anyone diagnose issues with these promisor packs. Signed-off-by: Derrick Stolee <derrickstolee@github.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Derrick Stolee committed Mar 9, 2022 at 16:01 UTC 4f39eb031af8690eb86eb781e43b10141dd47da9
2 files changed +6
bundle.c
+4
@@ -620,6 +620,10 @@ int unbundle(struct repository *r, struct bundle_header *header,
620 struct child_process ip = CHILD_PROCESS_INIT;
621 strvec_pushl(&ip.args, "index-pack", "--fix-thin", "--stdin", NULL);
622
623 + /* If there is a filter, then we need to create the promisor pack. */
624 + if (header->filter.choice)
625 + strvec_push(&ip.args, "--promisor=from-bundle");
626 +
627 if (extra_index_pack_args) {
628 strvec_pushv(&ip.args, extra_index_pack_args->v);
629 strvec_clear(extra_index_pack_args);
t/t6020-bundle-misc.sh
+2
@@ -521,6 +521,8 @@ do
521
522 git init unbundled &&
523 git -C unbundled bundle unbundle ../partial.bdl >ref-list.txt &&
524 + ls unbundled/.git/objects/pack/pack-*.promisor >promisor &&
525 + test_line_count = 1 promisor &&
526
527 # Count the same number of reachable objects.
528 reflist=$(git for-each-ref --format="%(objectname)") &&