git-init: autodetect core.symlinks

We already autodetect if filemode is reliable on the filesystem
to deal with VFAT and friends.  Do the same for symbolic link
support.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-init-db.c b/builtin-init-db.c
index af15cb27392dae6b16cee960908295ac252fe920..763fa55e76ef5b7e2f244f11199b5925382dac92 100644 (file)
--- a/builtin-init-db.c
+++ b/builtin-init-db.c
@@ -264,6 +264,21 @@ static int create_default_files(const char *git_dir, const char *template_path)
                if (work_tree != git_work_tree_cfg)
                        git_config_set("core.worktree", work_tree);
        }
+
+       /* Check if symlink is supported in the work tree */
+       if (!reinit) {
+               path[len] = 0;
+               strcpy(path + len, "tXXXXXX");
+               if (!close(xmkstemp(path)) &&
+                   !unlink(path) &&
+                   !symlink("testing", path) &&
+                   !lstat(path, &st1) &&
+                   S_ISLNK(st1.st_mode))
+                       unlink(path); /* good */
+               else
+                       git_config_set("core.symlinks", "false");
+       }
+
        return reinit;
 }