rev-parse: take prefix into account in --git-common-dir

Most of the time, get_git_common_dir() returns an absolute path so
prefix is irrelevant. If it returns a relative path (e.g. from the
main worktree) then prefixing is required.

Noticed-by: Mike Hommey <mh@glandium.org>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index 7e074aa..7a4f2c0 100644 (file)
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -763,7 +763,8 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
                                continue;
                        }
                        if (!strcmp(arg, "--git-common-dir")) {
-                               puts(get_git_common_dir());
+                               const char *pfx = prefix ? prefix : "";
+                               puts(prefix_filename(pfx, strlen(pfx), get_git_common_dir()));
                                continue;
                        }
                        if (!strcmp(arg, "--resolve-git-dir")) {

diff --git a/t/t2027-worktree-list.sh b/t/t2027-worktree-list.sh
index 75ebb1b..1b1b65a 100755 (executable)
--- a/t/t2027-worktree-list.sh
+++ b/t/t2027-worktree-list.sh
@@ -8,6 +8,16 @@ test_expect_success 'setup' '
        test_commit init
 '
 
+test_expect_success 'rev-parse --git-common-dir on main worktree' '
+       git rev-parse --git-common-dir >actual &&
+       echo .git >expected &&
+       test_cmp expected actual &&
+       mkdir sub &&
+       git -C sub rev-parse --git-common-dir >actual2 &&
+       echo sub/.git >expected2 &&
+       test_cmp expected2 actual2
+'
+
 test_expect_success '"list" all worktrees from main' '
        echo "$(git rev-parse --show-toplevel) $(git rev-parse --short HEAD) [$(git symbolic-ref --short HEAD)]" >expect &&
        test_when_finished "rm -rf here && git worktree prune" &&