Subject: [GSoC PATCH v9 2/5] repo: add the field references.format

From: Lucas Seiki Oshiro <[email-masked]>
Date: Thu, 7 Aug 2025 12:02:36 -0300

This commit is part of the series that introduces the new subcommand
git-repo-info.

The flag `--show-ref-format` from git-rev-parse is used for retrieving
the reference format (i.e. `files` or `reftable`). This way, it is
used for querying repository metadata, fitting in the purpose of
git-repo-info.

Add a new field `references.format` to the repo-info subcommand
containing that information.

Helped-by: Phillip Wood <[email-masked]>
Helped-by: Junio C Hamano <[email-masked]>
Helped-by: Justin Tobler <[email-masked]>
Helped-by: Eric Sunshine <[email-masked]>
Mentored-by: Karthik Nayak <[email-masked]>
Mentored-by: Patrick Steinhardt <[email-masked]>
Signed-off-by: Lucas Seiki Oshiro <[email-masked]>
---
 Documentation/git-repo.adoc | 19 ++++++++
 builtin/repo.c              | 89 ++++++++++++++++++++++++++++++++++++-
 t/meson.build               |  1 +
 t/t1900-repo.sh             | 57 ++++++++++++++++++++++++
 4 files changed, 164 insertions(+), 2 deletions(-)
 create mode 100755 t/t1900-repo.sh

diff --git a/Documentation/git-repo.adoc b/Documentation/git-repo.adoc
index 68c706f5a0..0ee783abc2 100644
--- a/Documentation/git-repo.adoc
+++ b/Documentation/git-repo.adoc
@@ -22,6 +22,25 @@ COMMANDS
 	Retrieve metadata-related information about the current repository. Only
 	the requested data will be returned based on their keys (see "INFO KEYS"
 	section below).
++
+The returned data is lexicographically sorted by the keys.
++
+The output format consists of key-value pairs one per line using the `=`
+character as the delimiter between the key and the value. Values containing
+"unusual" characters are quoted as explained for the configuration variable
+`core.quotePath` (see linkgit:git-config[1]). This is the default.
+
+INFO KEYS
+---------
+
+In order to obtain a set of values from `git repo info`, you should provide
+the keys that identify them. Here's a list of the available keys and the
+values that they return:
+
+`references.format`::
+The reference storage format. The valid values are:
++
+include::ref-storage-format.adoc[]
 
 SEE ALSO
 --------
diff --git a/builtin/repo.c b/builtin/repo.c
index fd2a9b4216..2b7ab5875e 100644
--- a/builtin/repo.c
+++ b/builtin/repo.c
@@ -1,17 +1,102 @@
 #include "builtin.h"
 #include "parse-options.h"
+#include "quote.h"
+#include "refs.h"
+#include "strbuf.h"
 
 static const char *const repo_usage[] = {
 	"git repo info [<key>...]",
 	NULL
 };
 
-static int repo_info(int argc UNUSED, const char **argv UNUSED,
-		     const char *prefix UNUSED, struct repository *repo UNUSED)
+typedef int get_value_fn(struct repository *repo, struct strbuf *buf);
+
+struct field {
+	const char *key;
+	get_value_fn *get_value;
+};
+
+static int get_references_format(struct repository *repo, struct strbuf *buf)
 {
+	strbuf_addstr(buf,
+		      ref_storage_format_to_name(repo->ref_storage_format));
 	return 0;
 }
 
+/* repo_info_fields keys should be in lexicographical order */
+static const struct field repo_info_fields[] = {
+	{ "references.format", get_references_format },
+};
+
+static int repo_info_fields_cmp(const void *va, const void *vb)
+{
+	const struct field *a = va;
+	const struct field *b = vb;
+
+	return strcmp(a->key, b->key);
+}
+
+static get_value_fn *get_value_fn_for_key(const char *key)
+{
+	const struct field search_key = { key, NULL };
+	const struct field *found = bsearch(&search_key, repo_info_fields,
+					    ARRAY_SIZE(repo_info_fields),
+					    sizeof(*found),
+					    repo_info_fields_cmp);
+	return found ? found->get_value : NULL;
+}
+
+static int qsort_strcmp(const void *va, const void *vb)
+{
+	const char *a = *(const char **)va;
+	const char *b = *(const char **)vb;
+
+	return strcmp(a, b);
+}
+
+static int print_fields(int argc, const char **argv, struct repository *repo)
+{
+	int ret = 0;
+	const char *last = "";
+	struct strbuf valbuf = STRBUF_INIT;
+	struct strbuf quotbuf = STRBUF_INIT;
+
+	QSORT(argv, argc, qsort_strcmp);
+
+	for (int i = 0; i < argc; i++) {
+		get_value_fn *get_value;
+		const char *key = argv[i];
+
+		strbuf_reset(&valbuf);
+		strbuf_reset(&quotbuf);
+
+		if (!strcmp(key, last))
+			continue;
+
+		last = key;
+		get_value = get_value_fn_for_key(key);
+
+		if (!get_value) {
+			ret = error(_("key '%s' not found"), key);
+			continue;
+		}
+
+		get_value(repo, &valbuf);
+		quote_c_style(valbuf.buf, &quotbuf, NULL, 0);
+		printf("%s=%s\n", key, quotbuf.buf);
+	}
+
+	strbuf_release(&valbuf);
+	strbuf_release(&quotbuf);
+	return ret;
+}
+
+static int repo_info(int argc, const char **argv, const char *prefix UNUSED,
+		     struct repository *repo)
+{
+	return print_fields(argc - 1, argv + 1, repo);
+}
+
 int cmd_repo(int argc, const char **argv, const char *prefix,
 	     struct repository *repo)
 {
diff --git a/t/meson.build b/t/meson.build
index bbeba1a8d5..252dbbc031 100644
--- a/t/meson.build
+++ b/t/meson.build
@@ -230,6 +230,7 @@ integration_tests = [
   't1700-split-index.sh',
   't1701-racy-split-index.sh',
   't1800-hook.sh',
+  't1900-repo.sh',
   't2000-conflict-when-checking-files-out.sh',
   't2002-checkout-cache-u.sh',
   't2003-checkout-cache-mkdir.sh',
diff --git a/t/t1900-repo.sh b/t/t1900-repo.sh
new file mode 100755
index 0000000000..2b2516dbae
--- /dev/null
+++ b/t/t1900-repo.sh
@@ -0,0 +1,57 @@
+#!/bin/sh
+
+test_description='test git repo-info'
+
+. ./test-lib.sh
+
+# Test whether a key-value pair is correctly returned
+#
+# Usage: test_repo_info <label> <init command> <key> <expected value>
+#
+# Arguments:
+#   label: the label of the test
+#   init_command: a command which creates a repository
+#   repo_name: the name of the repository that will be created in init_command
+#   key: the key of the field that is being tested
+#   expected_value: the value that the field should contain
+test_repo_info () {
+	label=$1
+	init_command=$2
+	repo_name=$3
+	key=$4
+	expected_value=$5
+
+	test_expect_success "$label" '
+		eval "$init_command $repo_name" &&
+		echo "$key=$expected_value" >expected &&
+		git -C $repo_name repo info "$key" >actual &&
+		test_cmp expected actual
+	'
+}
+
+test_repo_info 'ref format files is retrieved correctly' '
+	git init --ref-format=files' 'format-files' 'references.format' 'files'
+
+test_repo_info 'ref format reftable is retrieved correctly' '
+	git init --ref-format=reftable' 'format-reftable' 'references.format' 'reftable'
+
+test_expect_success 'git-repo-info fails if an invalid key is requested' '
+	echo "error: key ${SQ}foo${SQ} not found" >expected_err &&
+	test_must_fail git repo info foo 2>actual_err &&
+	test_cmp expected_err actual_err
+'
+
+test_expect_success 'git-repo-info outputs data even if there is an invalid field' '
+	echo "references.format=$(test_detect_ref_format)" >expected &&
+	test_must_fail git repo info foo references.format bar >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'only one value is returned if the same key is requested twice' '
+	val=$(git rev-parse --show-ref-format) &&
+	echo "references.format=$val" >expect &&
+	git repo info references.format references.format >actual &&
+	test_cmp expect actual
+'
+
+test_done
-- 
2.39.5 (Apple Git-154)