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#include "builtin.h"
#include "cache.h"
#include "refs.h"
static const char git_symbolic_ref_usage[] =
"git-symbolic-ref [-q] [-m <reason>] name [ref]";
static void check_symref(const char *HEAD, int quiet)
{
unsigned char sha1[20];
int flag;
const char *refs_heads_master = resolve_ref(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;
git_config(git_default_config);
while (1 < argc) {
const char *arg = argv[1];
if (arg[0] != '-')
break;
else if (!strcmp("-q", arg))
quiet = 1;
else if (!strcmp("-m", arg)) {
argc--;
argv++;
if (argc <= 1)
break;
msg = argv[1];
if (!*msg)
die("Refusing to perform update with empty message");
if (strchr(msg, '\n'))
die("Refusing to perform update with \\n in message");
}
else if (!strcmp("--", arg)) {
argc--;
argv++;
break;
}
else
die("unknown option %s", arg);
argc--;
argv++;
}
switch (argc) {
case 2:
check_symref(argv[1], quiet);
break;
case 3:
create_symref(argv[1], argv[2], msg);
break;
default:
usage(git_symbolic_ref_usage);
}
return 0;
}
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