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-rw-r--r--builtin/symbolic-ref.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/builtin/symbolic-ref.c b/builtin/symbolic-ref.c
new file mode 100644
index 0000000000..801d62ece5
--- /dev/null
+++ b/builtin/symbolic-ref.c
@@ -0,0 +1,63 @@
+#include "builtin.h"
+#include "cache.h"
+#include "refs.h"
+#include "parse-options.h"
+
+static const char * const git_symbolic_ref_usage[] = {
+ "git symbolic-ref [options] name [ref]",
+ NULL
+};
+
+static int shorten;
+
+static void check_symref(const char *HEAD, int quiet)
+{
+ unsigned char sha1[20];
+ int flag;
+ const char *refname = resolve_ref_unsafe(HEAD, sha1, 0, &flag);
+
+ if (!refname)
+ die("No such ref: %s", HEAD);
+ else if (!(flag & REF_ISSYMREF)) {
+ if (!quiet)
+ die("ref %s is not a symbolic ref", HEAD);
+ else
+ exit(1);
+ }
+ if (shorten)
+ refname = shorten_unambiguous_ref(refname, 0);
+ puts(refname);
+}
+
+int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
+{
+ int quiet = 0;
+ const char *msg = NULL;
+ struct option options[] = {
+ OPT__QUIET(&quiet,
+ "suppress error message for non-symbolic (detached) refs"),
+ OPT_BOOL(0, "short", &shorten, "shorten ref output"),
+ OPT_STRING('m', NULL, &msg, "reason", "reason of the update"),
+ OPT_END(),
+ };
+
+ git_config(git_default_config, NULL);
+ argc = parse_options(argc, argv, prefix, options,
+ git_symbolic_ref_usage, 0);
+ if (msg &&!*msg)
+ die("Refusing to perform update with empty message");
+ switch (argc) {
+ case 1:
+ check_symref(argv[0], quiet);
+ break;
+ case 2:
+ if (!strcmp(argv[0], "HEAD") &&
+ prefixcmp(argv[1], "refs/"))
+ die("Refusing to point HEAD outside of refs/");
+ create_symref(argv[0], argv[1], msg);
+ break;
+ default:
+ usage_with_options(git_symbolic_ref_usage, options);
+ }
+ return 0;
+}