builtin/merge-recursive.c

   1 #include "builtin.h"
   2 #include "commit.h"
   3 #include "tag.h"
   4 #include "merge-recursive.h"
   5 #include "xdiff-interface.h"
   6
   7 static const char builtin_merge_recursive_usage[] =
   8         "git %s <base>... -- <head> <remote> ...";
   9
  10 static const char *better_branch_name(const char *branch)
  11 {
  12         static char githead_env[8 + 40 + 1];
  13         char *name;
  14
  15         if (strlen(branch) != 40)
  16                 return branch;
  17         xsnprintf(githead_env, sizeof(githead_env), "GITHEAD_%s", branch);
  18         name = getenv(githead_env);
  19         return name ? name : branch;
  20 }
  21
  22 int cmd_merge_recursive(int argc, const char **argv, const char *prefix)
  23 {
  24         const unsigned char *bases[21];
  25         unsigned bases_count = 0;
  26         int i, failed;
  27         unsigned char h1[20], h2[20];
  28         struct merge_options o;
  29         struct commit *result;
  30
  31         init_merge_options(&o);
  32         if (argv[0] && ends_with(argv[0], "-subtree"))
  33                 o.subtree_shift = "";
  34
  35         if (argc < 4)
  36                 usagef(builtin_merge_recursive_usage, argv[0]);
  37
  38         for (i = 1; i < argc; ++i) {
  39                 const char *arg = argv[i];
  40
  41                 if (starts_with(arg, "--")) {
  42                         if (!arg[2])
  43                                 break;
  44                         if (parse_merge_opt(&o, arg + 2))
  45                                 die("Unknown option %s", arg);
  46                         continue;
  47                 }
  48                 if (bases_count < ARRAY_SIZE(bases)-1) {
  49                         unsigned char *sha = xmalloc(20);
  50                         if (get_sha1(argv[i], sha))
  51                                 die("Could not parse object '%s'", argv[i]);
  52                         bases[bases_count++] = sha;
  53                 }
  54                 else
  55                         warning("Cannot handle more than %d bases. "
  56                                 "Ignoring %s.",
  57                                 (int)ARRAY_SIZE(bases)-1, argv[i]);
  58         }
  59         if (argc - i != 3) /* "--" "<head>" "<remote>" */
  60                 die("Not handling anything other than two heads merge.");
  61
  62         o.branch1 = argv[++i];
  63         o.branch2 = argv[++i];
  64
  65         if (get_sha1(o.branch1, h1))
  66                 die("Could not resolve ref '%s'", o.branch1);
  67         if (get_sha1(o.branch2, h2))
  68                 die("Could not resolve ref '%s'", o.branch2);
  69
  70         o.branch1 = better_branch_name(o.branch1);
  71         o.branch2 = better_branch_name(o.branch2);
  72
  73         if (o.verbosity >= 3)
  74                 printf("Merging %s with %s\n", o.branch1, o.branch2);
  75
  76         failed = merge_recursive_generic(&o, h1, h2, bases_count, bases, &result);
  77         if (failed < 0)
  78                 return 128; /* die() error code */
  79         return failed;
  80 }