builtin / merge-base.con commit Merge branch 'js/t7406-recursive-submodule-update-order-fix' (10639c3)
   1#include "builtin.h"
   2#include "cache.h"
   3#include "config.h"
   4#include "commit.h"
   5#include "refs.h"
   6#include "diff.h"
   7#include "revision.h"
   8#include "parse-options.h"
   9#include "repository.h"
  10
  11static int show_merge_base(struct commit **rev, int rev_nr, int show_all)
  12{
  13        struct commit_list *result, *r;
  14
  15        result = get_merge_bases_many_dirty(rev[0], rev_nr - 1, rev + 1);
  16
  17        if (!result)
  18                return 1;
  19
  20        for (r = result; r; r = r->next) {
  21                printf("%s\n", oid_to_hex(&r->item->object.oid));
  22                if (!show_all)
  23                        break;
  24        }
  25
  26        free_commit_list(result);
  27        return 0;
  28}
  29
  30static const char * const merge_base_usage[] = {
  31        N_("git merge-base [-a | --all] <commit> <commit>..."),
  32        N_("git merge-base [-a | --all] --octopus <commit>..."),
  33        N_("git merge-base --independent <commit>..."),
  34        N_("git merge-base --is-ancestor <commit> <commit>"),
  35        N_("git merge-base --fork-point <ref> [<commit>]"),
  36        NULL
  37};
  38
  39static struct commit *get_commit_reference(const char *arg)
  40{
  41        struct object_id revkey;
  42        struct commit *r;
  43
  44        if (get_oid(arg, &revkey))
  45                die("Not a valid object name %s", arg);
  46        r = lookup_commit_reference(the_repository, &revkey);
  47        if (!r)
  48                die("Not a valid commit name %s", arg);
  49
  50        return r;
  51}
  52
  53static int handle_independent(int count, const char **args)
  54{
  55        struct commit_list *revs = NULL, *rev;
  56        int i;
  57
  58        for (i = count - 1; i >= 0; i--)
  59                commit_list_insert(get_commit_reference(args[i]), &revs);
  60
  61        reduce_heads_replace(&revs);
  62
  63        if (!revs)
  64                return 1;
  65
  66        for (rev = revs; rev; rev = rev->next)
  67                printf("%s\n", oid_to_hex(&rev->item->object.oid));
  68
  69        free_commit_list(revs);
  70        return 0;
  71}
  72
  73static int handle_octopus(int count, const char **args, int show_all)
  74{
  75        struct commit_list *revs = NULL;
  76        struct commit_list *result, *rev;
  77        int i;
  78
  79        for (i = count - 1; i >= 0; i--)
  80                commit_list_insert(get_commit_reference(args[i]), &revs);
  81
  82        result = get_octopus_merge_bases(revs);
  83        free_commit_list(revs);
  84        reduce_heads_replace(&result);
  85
  86        if (!result)
  87                return 1;
  88
  89        for (rev = result; rev; rev = rev->next) {
  90                printf("%s\n", oid_to_hex(&rev->item->object.oid));
  91                if (!show_all)
  92                        break;
  93        }
  94
  95        free_commit_list(result);
  96        return 0;
  97}
  98
  99static int handle_is_ancestor(int argc, const char **argv)
 100{
 101        struct commit *one, *two;
 102
 103        if (argc != 2)
 104                die("--is-ancestor takes exactly two commits");
 105        one = get_commit_reference(argv[0]);
 106        two = get_commit_reference(argv[1]);
 107        if (in_merge_bases(one, two))
 108                return 0;
 109        else
 110                return 1;
 111}
 112
 113struct rev_collect {
 114        struct commit **commit;
 115        int nr;
 116        int alloc;
 117        unsigned int initial : 1;
 118};
 119
 120static void add_one_commit(struct object_id *oid, struct rev_collect *revs)
 121{
 122        struct commit *commit;
 123
 124        if (is_null_oid(oid))
 125                return;
 126
 127        commit = lookup_commit(the_repository, oid);
 128        if (!commit ||
 129            (commit->object.flags & TMP_MARK) ||
 130            parse_commit(commit))
 131                return;
 132
 133        ALLOC_GROW(revs->commit, revs->nr + 1, revs->alloc);
 134        revs->commit[revs->nr++] = commit;
 135        commit->object.flags |= TMP_MARK;
 136}
 137
 138static int collect_one_reflog_ent(struct object_id *ooid, struct object_id *noid,
 139                                  const char *ident, timestamp_t timestamp,
 140                                  int tz, const char *message, void *cbdata)
 141{
 142        struct rev_collect *revs = cbdata;
 143
 144        if (revs->initial) {
 145                revs->initial = 0;
 146                add_one_commit(ooid, revs);
 147        }
 148        add_one_commit(noid, revs);
 149        return 0;
 150}
 151
 152static int handle_fork_point(int argc, const char **argv)
 153{
 154        struct object_id oid;
 155        char *refname;
 156        const char *commitname;
 157        struct rev_collect revs;
 158        struct commit *derived;
 159        struct commit_list *bases;
 160        int i, ret = 0;
 161
 162        switch (dwim_ref(argv[0], strlen(argv[0]), &oid, &refname)) {
 163        case 0:
 164                die("No such ref: '%s'", argv[0]);
 165        case 1:
 166                break; /* good */
 167        default:
 168                die("Ambiguous refname: '%s'", argv[0]);
 169        }
 170
 171        commitname = (argc == 2) ? argv[1] : "HEAD";
 172        if (get_oid(commitname, &oid))
 173                die("Not a valid object name: '%s'", commitname);
 174
 175        derived = lookup_commit_reference(the_repository, &oid);
 176        memset(&revs, 0, sizeof(revs));
 177        revs.initial = 1;
 178        for_each_reflog_ent(refname, collect_one_reflog_ent, &revs);
 179
 180        if (!revs.nr && !get_oid(refname, &oid))
 181                add_one_commit(&oid, &revs);
 182
 183        for (i = 0; i < revs.nr; i++)
 184                revs.commit[i]->object.flags &= ~TMP_MARK;
 185
 186        bases = get_merge_bases_many_dirty(derived, revs.nr, revs.commit);
 187
 188        /*
 189         * There should be one and only one merge base, when we found
 190         * a common ancestor among reflog entries.
 191         */
 192        if (!bases || bases->next) {
 193                ret = 1;
 194                goto cleanup_return;
 195        }
 196
 197        /* And the found one must be one of the reflog entries */
 198        for (i = 0; i < revs.nr; i++)
 199                if (&bases->item->object == &revs.commit[i]->object)
 200                        break; /* found */
 201        if (revs.nr <= i) {
 202                ret = 1; /* not found */
 203                goto cleanup_return;
 204        }
 205
 206        printf("%s\n", oid_to_hex(&bases->item->object.oid));
 207
 208cleanup_return:
 209        free_commit_list(bases);
 210        return ret;
 211}
 212
 213int cmd_merge_base(int argc, const char **argv, const char *prefix)
 214{
 215        struct commit **rev;
 216        int rev_nr = 0;
 217        int show_all = 0;
 218        int cmdmode = 0;
 219
 220        struct option options[] = {
 221                OPT_BOOL('a', "all", &show_all, N_("output all common ancestors")),
 222                OPT_CMDMODE(0, "octopus", &cmdmode,
 223                            N_("find ancestors for a single n-way merge"), 'o'),
 224                OPT_CMDMODE(0, "independent", &cmdmode,
 225                            N_("list revs not reachable from others"), 'r'),
 226                OPT_CMDMODE(0, "is-ancestor", &cmdmode,
 227                            N_("is the first one ancestor of the other?"), 'a'),
 228                OPT_CMDMODE(0, "fork-point", &cmdmode,
 229                            N_("find where <commit> forked from reflog of <ref>"), 'f'),
 230                OPT_END()
 231        };
 232
 233        git_config(git_default_config, NULL);
 234        argc = parse_options(argc, argv, prefix, options, merge_base_usage, 0);
 235
 236        if (cmdmode == 'a') {
 237                if (argc < 2)
 238                        usage_with_options(merge_base_usage, options);
 239                if (show_all)
 240                        die("--is-ancestor cannot be used with --all");
 241                return handle_is_ancestor(argc, argv);
 242        }
 243
 244        if (cmdmode == 'r' && show_all)
 245                die("--independent cannot be used with --all");
 246
 247        if (cmdmode == 'o')
 248                return handle_octopus(argc, argv, show_all);
 249
 250        if (cmdmode == 'r')
 251                return handle_independent(argc, argv);
 252
 253        if (cmdmode == 'f') {
 254                if (argc < 1 || 2 < argc)
 255                        usage_with_options(merge_base_usage, options);
 256                return handle_fork_point(argc, argv);
 257        }
 258
 259        if (argc < 2)
 260                usage_with_options(merge_base_usage, options);
 261
 262        ALLOC_ARRAY(rev, argc);
 263        while (argc-- > 0)
 264                rev[rev_nr++] = get_commit_reference(*argv++);
 265        return show_merge_base(rev, rev_nr, show_all);
 266}