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5907cda1b2
In many scripted Porcelain commands, we find this idiom:
if test "$(git rev-parse --verify A)" = "$(git merge-base A B)"
then
... A is an ancestor of B ...
fi
But you do not have to compute exact merge-base only to see if A is
an ancestor of B. Give them a more direct way to use the underlying
machinery.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
125 lines
3.0 KiB
C
125 lines
3.0 KiB
C
#include "builtin.h"
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#include "cache.h"
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#include "commit.h"
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#include "parse-options.h"
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static int show_merge_base(struct commit **rev, int rev_nr, int show_all)
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{
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struct commit_list *result;
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result = get_merge_bases_many(rev[0], rev_nr - 1, rev + 1, 0);
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if (!result)
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return 1;
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while (result) {
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printf("%s\n", sha1_to_hex(result->item->object.sha1));
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if (!show_all)
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return 0;
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result = result->next;
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}
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return 0;
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}
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static const char * const merge_base_usage[] = {
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"git merge-base [-a|--all] <commit> <commit>...",
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"git merge-base [-a|--all] --octopus <commit>...",
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"git merge-base --independent <commit>...",
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"git merge-base --is-ancestor <commit> <commit>",
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NULL
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};
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static struct commit *get_commit_reference(const char *arg)
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{
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unsigned char revkey[20];
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struct commit *r;
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if (get_sha1(arg, revkey))
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die("Not a valid object name %s", arg);
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r = lookup_commit_reference(revkey);
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if (!r)
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die("Not a valid commit name %s", arg);
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return r;
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}
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static int handle_octopus(int count, const char **args, int reduce, int show_all)
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{
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struct commit_list *revs = NULL;
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struct commit_list *result;
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int i;
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if (reduce)
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show_all = 1;
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for (i = count - 1; i >= 0; i--)
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commit_list_insert(get_commit_reference(args[i]), &revs);
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result = reduce ? reduce_heads(revs) : get_octopus_merge_bases(revs);
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if (!result)
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return 1;
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while (result) {
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printf("%s\n", sha1_to_hex(result->item->object.sha1));
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if (!show_all)
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return 0;
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result = result->next;
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}
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return 0;
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}
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static int handle_is_ancestor(int argc, const char **argv)
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{
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struct commit *one, *two;
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if (argc != 2)
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die("--is-ancestor takes exactly two commits");
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one = get_commit_reference(argv[0]);
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two = get_commit_reference(argv[1]);
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if (in_merge_bases(one, two))
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return 0;
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else
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return 1;
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}
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int cmd_merge_base(int argc, const char **argv, const char *prefix)
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{
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struct commit **rev;
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int rev_nr = 0;
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int show_all = 0;
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int octopus = 0;
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int reduce = 0;
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int is_ancestor = 0;
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struct option options[] = {
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OPT_BOOLEAN('a', "all", &show_all, "output all common ancestors"),
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OPT_BOOLEAN(0, "octopus", &octopus, "find ancestors for a single n-way merge"),
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OPT_BOOLEAN(0, "independent", &reduce, "list revs not reachable from others"),
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OPT_BOOLEAN(0, "is-ancestor", &is_ancestor,
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"is the first one ancestor of the other?"),
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OPT_END()
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};
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git_config(git_default_config, NULL);
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argc = parse_options(argc, argv, prefix, options, merge_base_usage, 0);
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if (!octopus && !reduce && argc < 2)
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usage_with_options(merge_base_usage, options);
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if (is_ancestor && (show_all | octopus | reduce))
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die("--is-ancestor cannot be used with other options");
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if (is_ancestor)
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return handle_is_ancestor(argc, argv);
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if (reduce && (show_all || octopus))
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die("--independent cannot be used with other options");
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if (octopus || reduce)
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return handle_octopus(argc, argv, reduce, show_all);
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rev = xmalloc(argc * sizeof(*rev));
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while (argc-- > 0)
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rev[rev_nr++] = get_commit_reference(*argv++);
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return show_merge_base(rev, rev_nr, show_all);
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}
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