repo-info: add field layout.shallow

Add the field layout.shallow to the repo-info command. The data
retrieved in this field is the same that currently is obtained by
running `git rev-parse --is-shallow-repository`.

Mentored-by: Karthik Nayak <karthik.188@gmail.com>
Mentored-by Patrick Steinhardt <ps@pks.im>
Signed-off-by: Lucas Seiki Oshiro <lucasseikioshiro@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: lucasoshiro

builtin/repo-info.c

@@ -7,6 +7,7 @@
 #include "parse-options.h"
 #include "quote.h"
 #include "refs.h"
+#include "shallow.h"
 
 enum output_format {
 	FORMAT_JSON,
@@ -23,7 +24,8 @@ enum repo_info_references_field {
 };
 
 enum repo_info_layout_field {
-	FIELD_LAYOUT_BARE = 1 << 0
+	FIELD_LAYOUT_BARE = 1 << 0,
+	FIELD_LAYOUT_SHALLOW = 1 << 1
 };
 
 struct repo_info_field {
@@ -49,6 +51,10 @@ static struct repo_info_field default_fields[] = {
 	{
 		.category = CATEGORY_LAYOUT,
 		.field.layout = FIELD_LAYOUT_BARE
+	},
+	{
+		.category = CATEGORY_LAYOUT,
+		.field.layout = FIELD_LAYOUT_SHALLOW
 	}
 };
 
@@ -91,6 +97,9 @@ static void repo_info_init(struct repo_info *repo_info,
 			} else if (!strcmp(arg, "layout.bare")) {
 				field->category = CATEGORY_LAYOUT;
 				field->field.layout = FIELD_LAYOUT_BARE;
+			} else if (!strcmp(arg, "layout.shallow")) {
+				field->category = CATEGORY_LAYOUT;
+				field->field.layout = FIELD_LAYOUT_SHALLOW;
 			} else {
 				die("invalid field '%s'", arg);
 			}
@@ -125,6 +134,11 @@ static void repo_info_print_plaintext(struct repo_info *repo_info) {
 						is_bare_repository() ?
 							"true" : "false");
 				break;
+			case FIELD_LAYOUT_SHALLOW:
+				print_key_value("layout.shallow",
+						is_repository_shallow(repo) ?
+							"true" : "false");
+				break;
 			}
 			break;
 		}
@@ -173,6 +187,11 @@ static void repo_info_print_json(struct repo_info *repo_info)
 			jw_object_bool(&jw, "bare",
 				       is_bare_repository());
 		}
+
+		if (layout_fields & FIELD_LAYOUT_SHALLOW) {
+			jw_object_bool(&jw, "shallow",
+				       is_repository_shallow(repo));
+		}
 		jw_end(&jw);
 	}
 	jw_end(&jw);

t/t1900-repo-info.sh

@@ -6,7 +6,7 @@ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
 
-DEFAULT_NUMBER_OF_FIELDS=2
+DEFAULT_NUMBER_OF_FIELDS=3
 
 parse_json () {
 	tr '\n' ' ' | "$PERL_PATH" "$TEST_DIRECTORY/t0019/parse_json.perl"
@@ -77,6 +77,20 @@ test_repo_info 'bare repository = false is retrieved correctly' '
 test_repo_info 'bare repository = true is retrieved correctly' '
 	git init --bare repo' 'layout.bare' 'true'
 
+test_repo_info 'shallow repository = false is retrieved correctly' '
+	git init repo' 'layout.shallow' 'false'
+
+test_repo_info 'shallow repository = true is retrieved correctly' '
+	git init remote &&
+	cd remote &&
+	echo x >x &&
+	git add x &&
+	git commit -m x &&
+	cd .. &&
+	git clone --depth 1 "file://$PWD/remote" repo &&
+	rm -rf remote
+	' 'layout.shallow' 'true'
+
 test_expect_success 'plaintext: output all default fields' "
 	git repo-info --format=plaintext >actual &&
 	test_line_count = $DEFAULT_NUMBER_OF_FIELDS actual