builtin/pack-refs: stop using the_repository

Remove the_repository global variable in favor of the repository
argument that gets passed in "builtin/pack-refs.c".

When `-h` is passed to the command outside a Git repository, the
`run_builtin()` will call the `cmd_pack_refs()` function with `repo` set
to NULL and then early in the function, `parse_options()` call will give
the options help and exit.

Mentored-by: Christian Couder <[email protected]>
Signed-off-by: Usman Akinyemi <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: Unique-Usman

builtin/pack-refs.c

@@ -1,5 +1,3 @@
-#define USE_THE_REPOSITORY_VARIABLE
-
 #include "builtin.h"
 #include "config.h"
 #include "gettext.h"
@@ -15,7 +13,7 @@ static char const * const pack_refs_usage[] = {
 int cmd_pack_refs(int argc,
 		  const char **argv,
 		  const char *prefix,
-		  struct repository *repo UNUSED)
+		  struct repository *repo)
 {
 	struct ref_exclusions excludes = REF_EXCLUSIONS_INIT;
 	struct string_list included_refs = STRING_LIST_INIT_NODUP;
@@ -39,7 +37,7 @@ int cmd_pack_refs(int argc,
 			N_("references to exclude")),
 		OPT_END(),
 	};
-	git_config(git_default_config, NULL);
+	repo_config(repo, git_default_config, NULL);
 	if (parse_options(argc, argv, prefix, opts, pack_refs_usage, 0))
 		usage_with_options(pack_refs_usage, opts);
 
@@ -52,7 +50,7 @@ int cmd_pack_refs(int argc,
 	if (!pack_refs_opts.includes->nr)
 		string_list_append(pack_refs_opts.includes, "refs/tags/*");
 
-	ret = refs_pack_refs(get_main_ref_store(the_repository), &pack_refs_opts);
+	ret = refs_pack_refs(get_main_ref_store(repo), &pack_refs_opts);
 
 	clear_ref_exclusions(&excludes);
 	string_list_clear(&included_refs, 0);

t/t0610-reftable-basics.sh

@@ -14,6 +14,13 @@ export GIT_TEST_DEFAULT_REF_FORMAT
 
 INVALID_OID=$(test_oid 001)
 
+test_expect_success 'pack-refs does not crash with -h' '
+	test_expect_code 129 git pack-refs -h >usage &&
+	test_grep "[Uu]sage: git pack-refs " usage &&
+	test_expect_code 129 nongit git pack-refs -h >usage &&
+	test_grep "[Uu]sage: git pack-refs " usage
+'
+
 test_expect_success 'init: creates basic reftable structures' '
 	test_when_finished "rm -rf repo" &&
 	git init repo &&