Merge branch 'jt/keep-partial-clone-filter-upon-lazy-fetch'

The lazy fetching done internally to make missing objects available
in a partial clone incorrectly made permanent damage to the partial
clone filter in the repository, which has been corrected.

* jt/keep-partial-clone-filter-upon-lazy-fetch:
  fetch: do not override partial clone filter
  promisor-remote: remove unused variable

builtin/fetch.c

@@ -1684,7 +1684,7 @@ static inline void fetch_one_setup_partial(struct remote *remote)
 	 * If this is a partial-fetch request, we enable partial on
 	 * this repo if not already enabled and remember the given
 	 * filter-spec as the default for subsequent fetches to this
-	 * remote.
+	 * remote if there is currently no default filter-spec.
 	 */
 	if (filter_options.choice) {
 		partial_clone_register(remote->name, &filter_options);

list-objects-filter-options.c

@@ -344,11 +344,19 @@ void partial_clone_register(
 	const char *remote,
 	struct list_objects_filter_options *filter_options)
 {
+	struct promisor_remote *promisor_remote;
 	char *cfg_name;
 	char *filter_name;
 
 	/* Check if it is already registered */
-	if (!promisor_remote_find(remote)) {
+	if ((promisor_remote = promisor_remote_find(remote))) {
+		if (promisor_remote->partial_clone_filter)
+			/*
+			 * Remote is already registered and a filter is already
+			 * set, so we don't need to do anything here.
+			 */
+			return;
+	} else {
 		if (upgrade_repository_format(1) < 0)
 			die(_("unable to upgrade repository format to support partial clone"));
 

promisor-remote.c

@@ -6,7 +6,6 @@
 #include "strvec.h"
 
 static char *repository_format_partial_clone;
-static const char *core_partial_clone_filter_default;
 
 void set_repository_format_partial_clone(char *partial_clone)
 {
@@ -100,10 +99,6 @@ static int promisor_remote_config(const char *var, const char *value, void *data
 	size_t namelen;
 	const char *subkey;
 
-	if (!strcmp(var, "core.partialclonefilter"))
-		return git_config_string(&core_partial_clone_filter_default,
-					 var, value);
-
 	if (parse_config_key(var, "remote", &name, &namelen, &subkey) < 0)
 		return 0;
 

promisor-remote.h

@@ -9,7 +9,7 @@ struct object_id;
  * Promisor remote linked list
  *
  * Information in its fields come from remote.XXX config entries or
- * from extensions.partialclone or core.partialclonefilter.
+ * from extensions.partialclone.
  */
 struct promisor_remote {
 	struct promisor_remote *next;

t/t5601-clone.sh

@@ -683,7 +683,8 @@ test_expect_success 'partial clone' '
 
 test_expect_success 'partial clone with -o' '
 	partial_clone_server server &&
-	git clone -o blah --filter=blob:limit=0 "file://$(pwd)/server" client
+	git clone -o blah --filter=blob:limit=0 "file://$(pwd)/server" client &&
+	test_cmp_config -C client "blob:limit=0" --get-all remote.blah.partialclonefilter
 '
 
 test_expect_success 'partial clone: warn if server does not support object filtering' '