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-rw-r--r--builtin/symbolic-ref.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/builtin/symbolic-ref.c b/builtin/symbolic-ref.c
new file mode 100644
index 0000000..80237f0
--- /dev/null
+++ b/builtin/symbolic-ref.c
@@ -0,0 +1,78 @@
+#include "builtin.h"
+#include "config.h"
+#include "cache.h"
+#include "refs.h"
+#include "parse-options.h"
+
+static const char * const git_symbolic_ref_usage[] = {
+ N_("git symbolic-ref [<options>] <name> [<ref>]"),
+ N_("git symbolic-ref -d [-q] <name>"),
+ NULL
+};
+
+static int check_symref(const char *HEAD, int quiet, int shorten, int print)
+{
+ int flag;
+ const char *refname = resolve_ref_unsafe(HEAD, 0, NULL, &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
+ return 1;
+ }
+ if (print) {
+ if (shorten)
+ refname = shorten_unambiguous_ref(refname, 0);
+ puts(refname);
+ }
+ return 0;
+}
+
+int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
+{
+ int quiet = 0, delete = 0, shorten = 0, ret = 0;
+ const char *msg = NULL;
+ struct option options[] = {
+ OPT__QUIET(&quiet,
+ N_("suppress error message for non-symbolic (detached) refs")),
+ OPT_BOOL('d', "delete", &delete, N_("delete symbolic ref")),
+ OPT_BOOL(0, "short", &shorten, N_("shorten ref output")),
+ OPT_STRING('m', NULL, &msg, N_("reason"), N_("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");
+
+ if (delete) {
+ if (argc != 1)
+ usage_with_options(git_symbolic_ref_usage, options);
+ ret = check_symref(argv[0], 1, 0, 0);
+ if (ret)
+ die("Cannot delete %s, not a symbolic ref", argv[0]);
+ if (!strcmp(argv[0], "HEAD"))
+ die("deleting '%s' is not allowed", argv[0]);
+ return delete_ref(NULL, argv[0], NULL, REF_NO_DEREF);
+ }
+
+ switch (argc) {
+ case 1:
+ ret = check_symref(argv[0], quiet, shorten, 1);
+ break;
+ case 2:
+ if (!strcmp(argv[0], "HEAD") &&
+ !starts_with(argv[1], "refs/"))
+ die("Refusing to point HEAD outside of refs/");
+ ret = !!create_symref(argv[0], argv[1], msg);
+ break;
+ default:
+ usage_with_options(git_symbolic_ref_usage, options);
+ }
+ return ret;
+}