Andrew's git - gitweb.git/blob - 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
   7static const char builtin_merge_recursive_usage[] =
   8        "git %s <base>... -- <head> <remote> ...";
   9
  10static 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
  22int 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}