Subject: [PATCH] repo: add new flag --keys to git-repo-info

From: Lucas Seiki Oshiro <[email-masked]>
Date: Sun, 7 Dec 2025 16:02:10 -0300

Currently, if the user wants to find what are the available keys,
they need to either check the documentation or to ask to all the
key-value pairs by using --all.

Add a new flag --keys for listing only the available keys without
listing the values.

Signed-off-by: Lucas Seiki Oshiro <[email-masked]>
---

Hi!

After the Junio's suggestion [1], this patch adds a new flag --keys to
git-repo-info. This new flag only prints the available keys, without
printing the corresponding values.

This patch is based on top of master bdc5341ff6 (The sixth batch,
2025-12-05) with lo/repo-struct-z merged.

[1] https://lore.kernel.org/git/[email-masked]/

 Documentation/git-repo.adoc |  4 ++++
 builtin/repo.c              | 17 +++++++++++++++++
 t/t1900-repo.sh             | 13 ++-----------
 3 files changed, 23 insertions(+), 11 deletions(-)

diff --git a/Documentation/git-repo.adoc b/Documentation/git-repo.adoc
index c4a78277df..f0f4d77db8 100644
--- a/Documentation/git-repo.adoc
+++ b/Documentation/git-repo.adoc
@@ -9,6 +9,7 @@ SYNOPSIS
 --------
 [synopsis]
 git repo info [--format=(keyvalue|nul) | -z] [--all | <key>...]
+git repo info --keys
 git repo structure [--format=(table|keyvalue|nul) | -z]
 
 DESCRIPTION
@@ -44,6 +45,9 @@ supported:
 +
 `-z` is an alias for `--format=nul`.
 
+`info --keys`::
+List all the available keys, one per line.
+
 `structure [--format=(table|keyvalue|nul) | -z]`::
 	Retrieve statistics about the current repository structure. The
 	following kinds of information are reported:
diff --git a/builtin/repo.c b/builtin/repo.c
index 0dd41b1778..45e9d59d55 100644
--- a/builtin/repo.c
+++ b/builtin/repo.c
@@ -16,6 +16,7 @@
 
 static const char *const repo_usage[] = {
 	"git repo info [--format=(keyvalue|nul) | -z] [--all | <key>...]",
+	"git repo info --keys",
 	"git repo structure [--format=(table|keyvalue|nul) | -z]",
 	NULL
 };
@@ -146,6 +147,16 @@ static int print_all_fields(struct repository *repo,
 	return 0;
 }
 
+static int print_keys(void)
+{
+	for (size_t i = 0; i < ARRAY_SIZE(repo_info_fields); i++) {
+		const struct field *field = &repo_info_fields[i];
+		puts(field->key);
+	}
+
+	return 0;
+}
+
 static int parse_format_cb(const struct option *opt,
 			   const char *arg, int unset UNUSED)
 {
@@ -170,6 +181,7 @@ static int cmd_repo_info(int argc, const char **argv, const char *prefix,
 {
 	enum output_format format = FORMAT_KEYVALUE;
 	int all_keys = 0;
+	int show_keys = 0;
 	struct option options[] = {
 		OPT_CALLBACK_F(0, "format", &format, N_("format"),
 			       N_("output format"),
@@ -179,10 +191,15 @@ static int cmd_repo_info(int argc, const char **argv, const char *prefix,
 			       PARSE_OPT_NONEG | PARSE_OPT_NOARG,
 			       parse_format_cb),
 		OPT_BOOL(0, "all", &all_keys, N_("print all keys/values")),
+		OPT_BOOL(0, "keys", &show_keys, N_("show keys")),
 		OPT_END()
 	};
 
 	argc = parse_options(argc, argv, prefix, options, repo_usage, 0);
+
+	if (show_keys)
+		return print_keys();
+
 	if (format != FORMAT_KEYVALUE && format != FORMAT_NUL_TERMINATED)
 		die(_("unsupported output format"));
 
diff --git a/t/t1900-repo.sh b/t/t1900-repo.sh
index 51d55f11a5..d6e84a78e5 100755
--- a/t/t1900-repo.sh
+++ b/t/t1900-repo.sh
@@ -4,15 +4,6 @@ test_description='test git repo-info'
 
 . ./test-lib.sh
 
-# git-repo-info keys. It must contain the same keys listed in the const
-# repo_info_fields, in lexicographical order.
-REPO_INFO_KEYS='
-	layout.bare
-	layout.shallow
-	object.format
-	references.format
-'
-
 # Test whether a key-value pair is correctly returned
 #
 # Usage: test_repo_info <label> <init command> <repo_name> <key> <expected value>
@@ -119,8 +110,8 @@ test_expect_success 'git repo info uses the last requested format' '
 	test_cmp expected actual
 '
 
-test_expect_success 'git repo info --all returns all key-value pairs' '
-	git repo info $REPO_INFO_KEYS >expect &&
+test_expect_success 'git repo info --all and git repo info $(git repo info --keys) output the same data' '
+	git repo info $(git repo info --keys) >expect &&
 	git repo info --all >actual &&
 	test_cmp expect actual
 '
-- 
2.50.1 (Apple Git-155)