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] && !suffixcmp(argv[0], "-subtree"))
  29                 o.subtree_shift = "";
  30
  31         if (argc < 4)
  32                 usagef("%s <base>... -- <head> <remote> ...", argv[0]);
  33
  34         for (i = 1; i < argc; ++i) {
  35                 const char *arg = argv[i];
  36
  37                 if (!prefixcmp(arg, "--")) {
  38                         if (!arg[2])
  39                                 break;
  40                         if (!strcmp(arg+2, "ours"))
  41                                 o.recursive_variant = MERGE_RECURSIVE_OURS;
  42                         else if (!strcmp(arg+2, "theirs"))
  43                                 o.recursive_variant = MERGE_RECURSIVE_THEIRS;
  44                         else if (!strcmp(arg+2, "subtree"))
  45                                 o.subtree_shift = "";
  46                         else if (!prefixcmp(arg+2, "subtree="))
  47                                 o.subtree_shift = arg + 10;
  48                         else
  49                                 die("Unknown option %s", arg);
  50                         continue;
  51                 }
  52                 if (bases_count < ARRAY_SIZE(bases)-1) {
  53                         unsigned char *sha = xmalloc(20);
  54                         if (get_sha1(argv[i], sha))
  55                                 die("Could not parse object '%s'", argv[i]);
  56                         bases[bases_count++] = sha;
  57                 }
  58                 else
  59                         warning("Cannot handle more than %d bases. "
  60                                 "Ignoring %s.",
  61                                 (int)ARRAY_SIZE(bases)-1, argv[i]);
  62         }
  63         if (argc - i != 3) /* "--" "<head>" "<remote>" */
  64                 die("Not handling anything other than two heads merge.");
  65
  66         o.branch1 = argv[++i];
  67         o.branch2 = argv[++i];
  68
  69         if (get_sha1(o.branch1, h1))
  70                 die("Could not resolve ref '%s'", o.branch1);
  71         if (get_sha1(o.branch2, h2))
  72                 die("Could not resolve ref '%s'", o.branch2);
  73
  74         o.branch1 = better_branch_name(o.branch1);
  75         o.branch2 = better_branch_name(o.branch2);
  76
  77         if (o.verbosity >= 3)
  78                 printf("Merging %s with %s\n", o.branch1, o.branch2);
  79
  80         failed = merge_recursive_generic(&o, h1, h2, bases_count, bases, &result);
  81         if (failed < 0)
  82                 return 128; /* die() error code */
  83         return failed;
  84 }