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 + GIT_SHA1_HEXSZ + 1];
  13         char *name;
  14
  15         if (strlen(branch) != GIT_SHA1_HEXSZ)
  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 struct object_id *bases[21];
  25         unsigned bases_count = 0;
  26         int i, failed;
  27         struct object_id h1, h2;
  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                         struct object_id *oid = xmalloc(sizeof(struct object_id));
  50                         if (get_oid(argv[i], oid))
  51                                 die(_("could not parse object '%s'"), argv[i]);
  52                         bases[bases_count++] = oid;
  53                 }
  54                 else
  55                         warning(Q_("cannot handle more than %d base. "
  56                                    "Ignoring %s.",
  57                                    "cannot handle more than %d bases. "
  58                                    "Ignoring %s.",
  59                                     (int)ARRAY_SIZE(bases)-1),
  60                                 (int)ARRAY_SIZE(bases)-1, argv[i]);
  61         }
  62         if (argc - i != 3) /* "--" "<head>" "<remote>" */
  63                 die(_("not handling anything other than two heads merge."));
  64
  65         o.branch1 = argv[++i];
  66         o.branch2 = argv[++i];
  67
  68         if (get_oid(o.branch1, &h1))
  69                 die(_("could not resolve ref '%s'"), o.branch1);
  70         if (get_oid(o.branch2, &h2))
  71                 die(_("could not resolve ref '%s'"), o.branch2);
  72
  73         o.branch1 = better_branch_name(o.branch1);
  74         o.branch2 = better_branch_name(o.branch2);
  75
  76         if (o.verbosity >= 3)
  77                 printf(_("Merging %s with %s\n"), o.branch1, o.branch2);
  78
  79         failed = merge_recursive_generic(&o, &h1, &h2, bases_count, bases, &result);
  80         if (failed < 0)
  81                 return 128; /* die() error code */
  82         return failed;
  83 }