Merge branch 'jh/fsck-promisors'

In preparation for implementing narrow/partial clone, the machinery
for checking object connectivity used by gc and fsck has been
taught that a missing object is OK when it is referenced by a
packfile specially marked as coming from trusted repository that
promises to make them available on-demand and lazily.

* jh/fsck-promisors:
  gc: do not repack promisor packfiles
  rev-list: support termination at promisor objects
  sha1_file: support lazily fetching missing objects
  introduce fetch-object: fetch one promisor object
  index-pack: refactor writing of .keep files
  fsck: support promisor objects as CLI argument
  fsck: support referenced promisor objects
  fsck: support refs pointing to promisor objects
  fsck: introduce partialclone extension
  extension.partialclone: introduce partial clone extension

1 files changed, 27 insertions, 21 deletions

diff --git a/fetch-pack.c b/fetch-pack.c
index 9f6b07ad91..7aa1f58995 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -450,6 +450,8 @@ static int find_common(struct fetch_pack_args *args,
 
 	flushes = 0;
 	retval = -1;
+	if (args->no_dependents)
+		goto done;
 	while ((oid = get_rev())) {
 		packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
 		print_verbose(args, "have %s", oid_to_hex(oid));
@@ -735,29 +737,31 @@ static int everything_local(struct fetch_pack_args *args,
 		}
 	}
 
-	if (!args->deepen) {
-		for_each_ref(mark_complete_oid, NULL);
-		for_each_cached_alternate(mark_alternate_complete);
-		commit_list_sort_by_date(&complete);
-		if (cutoff)
-			mark_recent_complete_commits(args, cutoff);
-	}
+	if (!args->no_dependents) {
+		if (!args->deepen) {
+			for_each_ref(mark_complete_oid, NULL);
+			for_each_cached_alternate(mark_alternate_complete);
+			commit_list_sort_by_date(&complete);
+			if (cutoff)
+				mark_recent_complete_commits(args, cutoff);
+		}
 
-	/*
-	 * Mark all complete remote refs as common refs.
-	 * Don't mark them common yet; the server has to be told so first.
-	 */
-	for (ref = *refs; ref; ref = ref->next) {
-		struct object *o = deref_tag(lookup_object(ref->old_oid.hash),
-					     NULL, 0);
+		/*
+		 * Mark all complete remote refs as common refs.
+		 * Don't mark them common yet; the server has to be told so first.
+		 */
+		for (ref = *refs; ref; ref = ref->next) {
+			struct object *o = deref_tag(lookup_object(ref->old_oid.hash),
+						     NULL, 0);
 
-		if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
-			continue;
+			if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
+				continue;
 
-		if (!(o->flags & SEEN)) {
-			rev_list_push((struct commit *)o, COMMON_REF | SEEN);
+			if (!(o->flags & SEEN)) {
+				rev_list_push((struct commit *)o, COMMON_REF | SEEN);
 
-			mark_common((struct commit *)o, 1, 1);
+				mark_common((struct commit *)o, 1, 1);
+			}
 		}
 	}
 
@@ -833,7 +837,7 @@ static int get_pack(struct fetch_pack_args *args,
 		argv_array_push(&cmd.args, alternate_shallow_file);
 	}
 
-	if (do_keep) {
+	if (do_keep || args->from_promisor) {
 		if (pack_lockfile)
 			cmd.out = -1;
 		cmd_name = "index-pack";
@@ -843,7 +847,7 @@ static int get_pack(struct fetch_pack_args *args,
 			argv_array_push(&cmd.args, "-v");
 		if (args->use_thin_pack)
 			argv_array_push(&cmd.args, "--fix-thin");
-		if (args->lock_pack || unpack_limit) {
+		if (do_keep && (args->lock_pack || unpack_limit)) {
 			char hostname[HOST_NAME_MAX + 1];
 			if (xgethostname(hostname, sizeof(hostname)))
 				xsnprintf(hostname, sizeof(hostname), "localhost");
@@ -853,6 +857,8 @@ static int get_pack(struct fetch_pack_args *args,
 		}
 		if (args->check_self_contained_and_connected)
 			argv_array_push(&cmd.args, "--check-self-contained-and-connected");
+		if (args->from_promisor)
+			argv_array_push(&cmd.args, "--promisor");
 	}
 	else {
 		cmd_name = "unpack-objects";