checkout.c

   1 #include "cache.h"
   2 #include "remote.h"
   3 #include "checkout.h"
   4
   5 struct tracking_name_data {
   6         /* const */ char *src_ref;
   7         char *dst_ref;
   8         struct object_id *dst_oid;
   9         int unique;
  10 };
  11
  12 static int check_tracking_name(struct remote *remote, void *cb_data)
  13 {
  14         struct tracking_name_data *cb = cb_data;
  15         struct refspec query;
  16         memset(&query, 0, sizeof(struct refspec));
  17         query.src = cb->src_ref;
  18         if (remote_find_tracking(remote, &query) ||
  19             get_oid(query.dst, cb->dst_oid)) {
  20                 free(query.dst);
  21                 return 0;
  22         }
  23         if (cb->dst_ref) {
  24                 free(query.dst);
  25                 cb->unique = 0;
  26                 return 0;
  27         }
  28         cb->dst_ref = query.dst;
  29         return 0;
  30 }
  31
  32 const char *unique_tracking_name(const char *name, struct object_id *oid)
  33 {
  34         struct tracking_name_data cb_data = { NULL, NULL, NULL, 1 };
  35         cb_data.src_ref = xstrfmt("refs/heads/%s", name);
  36         cb_data.dst_oid = oid;
  37         for_each_remote(check_tracking_name, &cb_data);
  38         free(cb_data.src_ref);
  39         if (cb_data.unique)
  40                 return cb_data.dst_ref;
  41         free(cb_data.dst_ref);
  42         return NULL;
  43 }