[PATCH 11/11] bundle: unbundle promisor packs

["Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com>]

From: Derrick Stolee <derrickstolee@github.com>

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>
---
 bundle.c               | 4 ++++
 t/t6020-bundle-misc.sh | 8 +++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/bundle.c b/bundle.c
index e284ef63062..3d97de40ef0 100644
--- a/bundle.c
+++ b/bundle.c
@@ -631,6 +631,10 @@ int unbundle(struct repository *r, struct bundle_header *header,
 	struct child_process ip = CHILD_PROCESS_INIT;
 	strvec_pushl(&ip.args, "index-pack", "--fix-thin", "--stdin", NULL);
 
+	/* If there is a filter, then we need to create the promisor pack. */
+	if (header->filter)
+		strvec_push(&ip.args, "--promisor=from-bundle");
+
 	if (extra_index_pack_args) {
 		strvec_pushv(&ip.args, extra_index_pack_args->v);
 		strvec_clear(extra_index_pack_args);
diff --git a/t/t6020-bundle-misc.sh b/t/t6020-bundle-misc.sh
index 39cfefafb65..344af34db1e 100755
--- a/t/t6020-bundle-misc.sh
+++ b/t/t6020-bundle-misc.sh
@@ -513,7 +513,13 @@ do
 		The bundle uses this filter: $filter
 		The bundle records a complete history.
 		EOF
-		test_cmp expect actual
+		test_cmp expect actual &&
+
+		# This creates the first pack-file in the
+		# .git/objects/pack directory. Look for a .promisor.
+		git bundle unbundle partial.bdl &&
+		ls .git/objects/pack/pack-*.promisor >promisor &&
+		test_line_count = 1 promisor
 	'
 done
 
-- 
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