builtin-merge-recursive.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "tag.h"
   4 #include "merge-recursive.h"
   5
   6 static const char *better_branch_name(const char *branch)
   7 {
   8         static char githead_env[8 + 40 + 1];
   9         char *name;
  10
  11         if (strlen(branch) != 40)
  12                 return branch;
  13         sprintf(githead_env, "GITHEAD_%s", branch);
  14         name = getenv(githead_env);
  15         return name ? name : branch;
  16 }
  17
  18 int cmd_merge_recursive(int argc, const char **argv, const char *prefix)
  19 {
  20         const unsigned char *bases[21];
  21         unsigned bases_count = 0;
  22         int i, failed;
  23         unsigned char h1[20], h2[20];
  24         struct merge_options o;
  25         struct commit *result;
  26
  27         init_merge_options(&o);
  28         if (argv[0]) {
  29                 int namelen = strlen(argv[0]);
  30                 if (8 < namelen &&
  31                     !strcmp(argv[0] + namelen - 8, "-subtree"))
  32                         o.subtree_merge = 1;
  33         }
  34
  35         if (argc < 4)
  36                 die("Usage: %s <base>... -- <head> <remote> ...", argv[0]);
  37
  38         for (i = 1; i < argc; ++i) {
  39                 if (!strcmp(argv[i], "--"))
  40                         break;
  41                 if (bases_count < ARRAY_SIZE(bases)-1) {
  42                         unsigned char *sha = xmalloc(20);
  43                         if (get_sha1(argv[i], sha))
  44                                 die("Could not parse object '%s'", argv[i]);
  45                         bases[bases_count++] = sha;
  46                 }
  47                 else
  48                         warning("Cannot handle more than %zu bases. "
  49                                 "Ignoring %s.", ARRAY_SIZE(bases)-1, argv[i]);
  50         }
  51         if (argc - i != 3) /* "--" "<head>" "<remote>" */
  52                 die("Not handling anything other than two heads merge.");
  53
  54         o.branch1 = argv[++i];
  55         o.branch2 = argv[++i];
  56
  57         if (get_sha1(o.branch1, h1))
  58                 die("Could not resolve ref '%s'", o.branch1);
  59         if (get_sha1(o.branch2, h2))
  60                 die("Could not resolve ref '%s'", o.branch2);
  61
  62         o.branch1 = better_branch_name(o.branch1);
  63         o.branch2 = better_branch_name(o.branch2);
  64
  65         if (o.verbosity >= 3)
  66                 printf("Merging %s with %s\n", o.branch1, o.branch2);
  67
  68         failed = merge_recursive_generic(&o, h1, h2, bases_count, bases, &result);
  69         if (failed < 0)
  70                 return 128; /* die() error code */
  71         return failed;
  72 }