[PATCH 3/9] builtin/verify-commit: stop using `the_repository`

[Usman Akinyemi <usmanakinyemi202@gmail.com>]

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

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

Pass the repository available in the calling context to `verify_commit()`
to remove it's dependency on the global `the_repository` variable.

Mentored-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Usman Akinyemi <usmanakinyemi202@gmail.com>
---
 builtin/verify-commit.c  | 13 ++++++-------
 t/t7510-signed-commit.sh |  7 +++++++
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/builtin/verify-commit.c b/builtin/verify-commit.c
index 779b7988ca..5f749a30da 100644
--- a/builtin/verify-commit.c
+++ b/builtin/verify-commit.c
@@ -5,7 +5,6 @@
  *
  * Based on git-verify-tag
  */
-#define USE_THE_REPOSITORY_VARIABLE
 #include "builtin.h"
 #include "config.h"
 #include "gettext.h"
@@ -33,15 +32,15 @@ static int run_gpg_verify(struct commit *commit, unsigned flags)
 	return ret;
 }
 
-static int verify_commit(const char *name, unsigned flags)
+static int verify_commit(struct repository *repo, const char *name, unsigned flags)
 {
 	struct object_id oid;
 	struct object *obj;
 
-	if (repo_get_oid(the_repository, name, &oid))
+	if (repo_get_oid(repo, name, &oid))
 		return error("commit '%s' not found.", name);
 
-	obj = parse_object(the_repository, &oid);
+	obj = parse_object(repo, &oid);
 	if (!obj)
 		return error("%s: unable to read file.", name);
 	if (obj->type != OBJ_COMMIT)
@@ -54,7 +53,7 @@ static int verify_commit(const char *name, unsigned flags)
 int cmd_verify_commit(int argc,
 		      const char **argv,
 		      const char *prefix,
-		      struct repository *repo UNUSED)
+		      struct repository *repo)
 {
 	int i = 1, verbose = 0, had_error = 0;
 	unsigned flags = 0;
@@ -64,7 +63,7 @@ int cmd_verify_commit(int argc,
 		OPT_END()
 	};
 
-	git_config(git_default_config, NULL);
+	repo_config(repo, git_default_config, NULL);
 
 	argc = parse_options(argc, argv, prefix, verify_commit_options,
 			     verify_commit_usage, PARSE_OPT_KEEP_ARGV0);
@@ -78,7 +77,7 @@ int cmd_verify_commit(int argc,
 	 * was received in the process of writing the gpg input: */
 	signal(SIGPIPE, SIG_IGN);
 	while (i < argc)
-		if (verify_commit(argv[i++], flags))
+		if (verify_commit(repo, argv[i++], flags))
 			had_error = 1;
 	return had_error;
 }
diff --git a/t/t7510-signed-commit.sh b/t/t7510-signed-commit.sh
index 0d2dd29fe6..39677e859a 100755
--- a/t/t7510-signed-commit.sh
+++ b/t/t7510-signed-commit.sh
@@ -8,6 +8,13 @@ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 GNUPGHOME_NOT_USED=$GNUPGHOME
 . "$TEST_DIRECTORY/lib-gpg.sh"
 
+test_expect_success GPG 'verify-commit does not crash with -h' '
+	test_expect_code 129 git verify-commit -h >usage &&
+	test_grep "[Uu]sage: git verify-commit " usage &&
+	test_expect_code 129 nongit git verify-commit -h >usage &&
+	test_grep "[Uu]sage: git verify-commit " usage
+'
+
 test_expect_success GPG 'create signed commits' '
 	test_oid_cache <<-\EOF &&
 	header sha1:gpgsig
-- 
2.48.1