Andrew's git - gitweb.git/blob - builtin/symbolic-ref.c

   1#include "builtin.h"
   2#include "cache.h"
   3#include "refs.h"
   4#include "parse-options.h"
   5
   6static const char * const git_symbolic_ref_usage[] = {
   7        "git symbolic-ref [options] name [ref]",
   8        NULL
   9};
  10
  11static void check_symref(const char *HEAD, int quiet)
  12{
  13        unsigned char sha1[20];
  14        int flag;
  15        const char *refs_heads_master = resolve_ref(HEAD, sha1, 0, &flag);
  16
  17        if (!refs_heads_master)
  18                die("No such ref: %s", HEAD);
  19        else if (!(flag & REF_ISSYMREF)) {
  20                if (!quiet)
  21                        die("ref %s is not a symbolic ref", HEAD);
  22                else
  23                        exit(1);
  24        }
  25        puts(refs_heads_master);
  26}
  27
  28int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
  29{
  30        int quiet = 0;
  31        const char *msg = NULL;
  32        struct option options[] = {
  33                OPT__QUIET(&quiet,
  34                        "suppress error message for non-symbolic (detached) refs"),
  35                OPT_STRING('m', NULL, &msg, "reason", "reason of the update"),
  36                OPT_END(),
  37        };
  38
  39        git_config(git_default_config, NULL);
  40        argc = parse_options(argc, argv, prefix, options,
  41                             git_symbolic_ref_usage, 0);
  42        if (msg &&!*msg)
  43                die("Refusing to perform update with empty message");
  44        switch (argc) {
  45        case 1:
  46                check_symref(argv[0], quiet);
  47                break;
  48        case 2:
  49                if (!strcmp(argv[0], "HEAD") &&
  50                    prefixcmp(argv[1], "refs/"))
  51                        die("Refusing to point HEAD outside of refs/");
  52                create_symref(argv[0], argv[1], msg);
  53                break;
  54        default:
  55                usage_with_options(git_symbolic_ref_usage, options);
  56        }
  57        return 0;
  58}