builtin/merge-base.c

   1 #include "builtin.h"
   2 #include "config.h"
   3 #include "commit.h"
   4 #include "gettext.h"
   5 #include "hex.h"
   6 #include "object-name.h"
   7 #include "parse-options.h"
   8 #include "repository.h"
   9 #include "commit-reach.h"
  10
  11 static int show_merge_base(struct commit **rev, int rev_nr, int show_all)
  12 {
  13         struct commit_list *result = NULL, *r;
  14
  15         if (repo_get_merge_bases_many_dirty(the_repository, rev[0],
  16                                             rev_nr - 1, rev + 1, &result) < 0) {
  17                 free_commit_list(result);
  18                 return -1;
  19         }
  20
  21         if (!result)
  22                 return 1;
  23
  24         for (r = result; r; r = r->next) {
  25                 printf("%s\n", oid_to_hex(&r->item->object.oid));
  26                 if (!show_all)
  27                         break;
  28         }
  29
  30         free_commit_list(result);
  31         return 0;
  32 }
  33
  34 static const char * const merge_base_usage[] = {
  35         N_("git merge-base [-a | --all] <commit> <commit>..."),
  36         N_("git merge-base [-a | --all] --octopus <commit>..."),
  37         N_("git merge-base --is-ancestor <commit> <commit>"),
  38         N_("git merge-base --independent <commit>..."),
  39         N_("git merge-base --fork-point <ref> [<commit>]"),
  40         NULL
  41 };
  42
  43 static struct commit *get_commit_reference(const char *arg)
  44 {
  45         struct object_id revkey;
  46         struct commit *r;
  47
  48         if (repo_get_oid(the_repository, arg, &revkey))
  49                 die("Not a valid object name %s", arg);
  50         r = lookup_commit_reference(the_repository, &revkey);
  51         if (!r)
  52                 die("Not a valid commit name %s", arg);
  53
  54         return r;
  55 }
  56
  57 static int handle_independent(int count, const char **args)
  58 {
  59         struct commit_list *revs = NULL, *rev;
  60         int i;
  61
  62         for (i = count - 1; i >= 0; i--)
  63                 commit_list_insert(get_commit_reference(args[i]), &revs);
  64
  65         reduce_heads_replace(&revs);
  66
  67         if (!revs)
  68                 return 1;
  69
  70         for (rev = revs; rev; rev = rev->next)
  71                 printf("%s\n", oid_to_hex(&rev->item->object.oid));
  72
  73         free_commit_list(revs);
  74         return 0;
  75 }
  76
  77 static int handle_octopus(int count, const char **args, int show_all)
  78 {
  79         struct commit_list *revs = NULL;
  80         struct commit_list *result = NULL, *rev;
  81         int i;
  82
  83         for (i = count - 1; i >= 0; i--)
  84                 commit_list_insert(get_commit_reference(args[i]), &revs);
  85
  86         if (get_octopus_merge_bases(revs, &result) < 0) {
  87                 free_commit_list(revs);
  88                 free_commit_list(result);
  89                 return 128;
  90         }
  91         free_commit_list(revs);
  92         reduce_heads_replace(&result);
  93
  94         if (!result)
  95                 return 1;
  96
  97         for (rev = result; rev; rev = rev->next) {
  98                 printf("%s\n", oid_to_hex(&rev->item->object.oid));
  99                 if (!show_all)
 100                         break;
 101         }
 102
 103         free_commit_list(result);
 104         return 0;
 105 }
 106
 107 static int handle_is_ancestor(int argc, const char **argv)
 108 {
 109         struct commit *one, *two;
 110         int ret;
 111
 112         if (argc != 2)
 113                 die("--is-ancestor takes exactly two commits");
 114         one = get_commit_reference(argv[0]);
 115         two = get_commit_reference(argv[1]);
 116         ret = repo_in_merge_bases(the_repository, one, two);
 117         if (ret < 0)
 118                 exit(128);
 119         if (ret)
 120                 return 0;
 121         else
 122                 return 1;
 123 }
 124
 125 static int handle_fork_point(int argc, const char **argv)
 126 {
 127         struct object_id oid;
 128         struct commit *derived, *fork_point;
 129         const char *commitname;
 130
 131         commitname = (argc == 2) ? argv[1] : "HEAD";
 132         if (repo_get_oid(the_repository, commitname, &oid))
 133                 die("Not a valid object name: '%s'", commitname);
 134
 135         derived = lookup_commit_reference(the_repository, &oid);
 136
 137         fork_point = get_fork_point(argv[0], derived);
 138
 139         if (!fork_point)
 140                 return 1;
 141
 142         printf("%s\n", oid_to_hex(&fork_point->object.oid));
 143         return 0;
 144 }
 145
 146 int cmd_merge_base(int argc, const char **argv, const char *prefix)
 147 {
 148         struct commit **rev;
 149         int rev_nr = 0;
 150         int show_all = 0;
 151         int cmdmode = 0;
 152         int ret;
 153
 154         struct option options[] = {
 155                 OPT_BOOL('a', "all", &show_all, N_("output all common ancestors")),
 156                 OPT_CMDMODE(0, "octopus", &cmdmode,
 157                             N_("find ancestors for a single n-way merge"), 'o'),
 158                 OPT_CMDMODE(0, "independent", &cmdmode,
 159                             N_("list revs not reachable from others"), 'r'),
 160                 OPT_CMDMODE(0, "is-ancestor", &cmdmode,
 161                             N_("is the first one ancestor of the other?"), 'a'),
 162                 OPT_CMDMODE(0, "fork-point", &cmdmode,
 163                             N_("find where <commit> forked from reflog of <ref>"), 'f'),
 164                 OPT_END()
 165         };
 166
 167         git_config(git_default_config, NULL);
 168         argc = parse_options(argc, argv, prefix, options, merge_base_usage, 0);
 169
 170         if (cmdmode == 'a') {
 171                 if (argc < 2)
 172                         usage_with_options(merge_base_usage, options);
 173                 if (show_all)
 174                         die(_("options '%s' and '%s' cannot be used together"),
 175                             "--is-ancestor", "--all");
 176                 return handle_is_ancestor(argc, argv);
 177         }
 178
 179         if (cmdmode == 'r' && show_all)
 180                 die(_("options '%s' and '%s' cannot be used together"),
 181                     "--independent", "--all");
 182
 183         if (cmdmode == 'o')
 184                 return handle_octopus(argc, argv, show_all);
 185
 186         if (cmdmode == 'r')
 187                 return handle_independent(argc, argv);
 188
 189         if (cmdmode == 'f') {
 190                 if (argc < 1 || 2 < argc)
 191                         usage_with_options(merge_base_usage, options);
 192                 return handle_fork_point(argc, argv);
 193         }
 194
 195         if (argc < 2)
 196                 usage_with_options(merge_base_usage, options);
 197
 198         ALLOC_ARRAY(rev, argc);
 199         while (argc-- > 0)
 200                 rev[rev_nr++] = get_commit_reference(*argv++);
 201         ret = show_merge_base(rev, rev_nr, show_all);
 202         free(rev);
 203         return ret;
 204 }