root/builtin/symbolic-ref.c

DEFINITIONS

1. check_symref
2. cmd_symbolic_ref

#include "builtin.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)
{
        unsigned char sha1[20];
        int flag;
        const char *refname = resolve_ref_unsafe(HEAD, 0, sha1, &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]);
                return delete_ref(argv[0], NULL, REF_NODEREF);
        }

        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/");
                create_symref(argv[0], argv[1], msg);
                break;
        default:
                usage_with_options(git_symbolic_ref_usage, options);
        }
        return ret;
}