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 builtin_merge_recursive_usage[] =
   7         "git %s <base>... -- <head> <remote> ...";
   8
   9 static const char *better_branch_name(const char *branch)
  10 {
  11         static char githead_env[8 + 40 + 1];
  12         char *name;
  13
  14         if (strlen(branch) != 40)
  15                 return branch;
  16         sprintf(githead_env, "GITHEAD_%s", branch);
  17         name = getenv(githead_env);
  18         return name ? name : branch;
  19 }
  20
  21 int cmd_merge_recursive(int argc, const char **argv, const char *prefix)
  22 {
  23         const unsigned char *bases[21];
  24         unsigned bases_count = 0;
  25         int i, failed;
  26         unsigned char h1[20], h2[20];
  27         struct merge_options o;
  28         struct commit *result;
  29
  30         init_merge_options(&o);
  31         if (argv[0] && !suffixcmp(argv[0], "-subtree"))
  32                 o.subtree_shift = "";
  33
  34         if (argc < 4)
  35                 usagef(builtin_merge_recursive_usage, argv[0]);
  36
  37         for (i = 1; i < argc; ++i) {
  38                 const char *arg = argv[i];
  39
  40                 if (!prefixcmp(arg, "--")) {
  41                         if (!arg[2])
  42                                 break;
  43                         if (!strcmp(arg+2, "ours"))
  44                                 o.recursive_variant = MERGE_RECURSIVE_OURS;
  45                         else if (!strcmp(arg+2, "theirs"))
  46                                 o.recursive_variant = MERGE_RECURSIVE_THEIRS;
  47                         else if (!strcmp(arg+2, "subtree"))
  48                                 o.subtree_shift = "";
  49                         else if (!prefixcmp(arg+2, "subtree="))
  50                                 o.subtree_shift = arg + 10;
  51                         else
  52                                 die("Unknown option %s", arg);
  53                         continue;
  54                 }
  55                 if (bases_count < ARRAY_SIZE(bases)-1) {
  56                         unsigned char *sha = xmalloc(20);
  57                         if (get_sha1(argv[i], sha))
  58                                 die("Could not parse object '%s'", argv[i]);
  59                         bases[bases_count++] = sha;
  60                 }
  61                 else
  62                         warning("Cannot handle more than %d bases. "
  63                                 "Ignoring %s.",
  64                                 (int)ARRAY_SIZE(bases)-1, argv[i]);
  65         }
  66         if (argc - i != 3) /* "--" "<head>" "<remote>" */
  67                 die("Not handling anything other than two heads merge.");
  68
  69         o.branch1 = argv[++i];
  70         o.branch2 = argv[++i];
  71
  72         if (get_sha1(o.branch1, h1))
  73                 die("Could not resolve ref '%s'", o.branch1);
  74         if (get_sha1(o.branch2, h2))
  75                 die("Could not resolve ref '%s'", o.branch2);
  76
  77         o.branch1 = better_branch_name(o.branch1);
  78         o.branch2 = better_branch_name(o.branch2);
  79
  80         if (o.verbosity >= 3)
  81                 printf("Merging %s with %s\n", o.branch1, o.branch2);
  82
  83         failed = merge_recursive_generic(&o, h1, h2, bases_count, bases, &result);
  84         if (failed < 0)
  85                 return 128; /* die() error code */
  86         return failed;
  87 }