[GSoC PATCH v7 4/5] repo: add the field layout.shallow

[Lucas Seiki Oshiro <lucasseikioshiro@gmail.com>]

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

The flag `--is-shallow-repository` from git-rev-parse is used for
retrieving whether the repository is shallow. This way, it is used for
querying repository metadata, fitting in the purpose of git-repo-info.

Then, add a new field `layout.shallow` to the git-repo-info subcommand
containing that information.

Helped-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Helped-by: Junio C Hamano <gitster@pobox.com>
Helped-by: Justin Tobler <jltobler@gmail.com>
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Mentored-by: Karthik Nayak <karthik.188@gmail.com>
Mentored-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Lucas Seiki Oshiro <lucasseikioshiro@gmail.com>
---
 Documentation/git-repo.adoc |  3 +++
 builtin/repo.c              |  9 +++++++++
 t/t1900-repo.sh             | 11 +++++++++++
 3 files changed, 23 insertions(+)

diff --git a/Documentation/git-repo.adoc b/Documentation/git-repo.adoc
index 98358c5539..140ee3a0aa 100644
--- a/Documentation/git-repo.adoc
+++ b/Documentation/git-repo.adoc
@@ -35,6 +35,9 @@ values that they return:
 `layout.bare`::
 `true` if this is a bare repository, otherwise `false`.
 
+`layout.shallow`::
+`true` if this is a shallow repository, otherwise `false`.
+
 `references.format`::
 The reference storage format. The valid values are:
 +
diff --git a/builtin/repo.c b/builtin/repo.c
index 2d51bfa195..56c3a4027f 100644
--- a/builtin/repo.c
+++ b/builtin/repo.c
@@ -6,6 +6,7 @@
 #include "quote.h"
 #include "refs.h"
 #include "strbuf.h"
+#include "shallow.h"
 
 static const char *const repo_usage[] = {
 	"git repo info [<key>...]",
@@ -26,6 +27,13 @@ static int get_layout_bare(struct repository *repo UNUSED, struct strbuf *buf)
 	return 0;
 }
 
+static int get_layout_shallow(struct repository *repo, struct strbuf *buf)
+{
+	strbuf_addstr(buf,
+		      is_repository_shallow(repo) ? "true" : "false");
+	return 0;
+}
+
 static int get_references_format(struct repository *repo, struct strbuf *buf)
 {
 	strbuf_addstr(buf,
@@ -36,6 +44,7 @@ static int get_references_format(struct repository *repo, struct strbuf *buf)
 /* repo_info_fields keys should be in lexicographical order */
 static const struct field repo_info_fields[] = {
 	{ "layout.bare", get_layout_bare },
+	{ "layout.shallow", get_layout_shallow },
 	{ "references.format", get_references_format },
 };
 
diff --git a/t/t1900-repo.sh b/t/t1900-repo.sh
index 6c555e90c3..6706cb4c44 100755
--- a/t/t1900-repo.sh
+++ b/t/t1900-repo.sh
@@ -41,6 +41,16 @@ test_repo_info 'bare repository = false is retrieved correctly' '
 test_repo_info 'bare repository = true is retrieved correctly' '
 	git init --bare' 'nonbare' 'layout.bare' 'true'
 
+test_repo_info 'shallow repository = false is retrieved correctly' '
+	git init' 'nonshallow' 'layout.shallow' 'false'
+
+test_repo_info 'shallow repository = true is retrieved correctly' '
+	git init remote &&
+	echo x >remote/x &&
+	git -C remote add x &&
+	git -C remote commit -m x &&
+	git clone --depth 1 "file://$PWD/remote"' 'shallow' 'layout.shallow' 'true'
+
 test_expect_success 'git-repo-info fails if an invalid key is requested' '
 	echo "error: key '\'foo\'' not found" >expected_err &&
 	test_must_fail git repo info foo 2>actual_err &&
@@ -68,4 +78,5 @@ test_expect_success 'output is returned correctly when two keys are requested' '
 	git init --ref-format=files two-keys &&
 	git -C two-keys repo info layout.bare references.format
 '
+
 test_done
-- 
2.39.5 (Apple Git-154)