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#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 void check_symref(const char *HEAD, int quiet)
{
unsigned char sha1[20];
int flag;
const char *refs_heads_master = resolve_ref_unsafe(HEAD, sha1, 0, &flag);
if (!refs_heads_master)
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);
}
puts(refs_heads_master);
}
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_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;
}
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