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https://github.com/git/git
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4f7eb2e5a3
On Sat, 30 Jul 2005, Linus Torvalds wrote: > > Yup, it's git-merge-base, and it is confused by the same thing that > confused git-rev-list. Hmm.. Here's a tentative fix. I'm not really happy with it, and maybe somebody else can come up with a better one. I think this one ends up being quite a bit more expensive than the old one (it will look up _all_ common parents that have a child that isn't common, and then select the newest one of the bunch), but I haven't really thought it through very much. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
#include <stdlib.h>
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#include "cache.h"
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#include "commit.h"
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static struct commit *common_ancestor(struct commit *rev1, struct commit *rev2)
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{
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struct commit_list *list = NULL;
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struct commit_list *result = NULL;
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if (rev1 == rev2)
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return rev1;
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parse_commit(rev1);
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parse_commit(rev2);
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rev1->object.flags |= 1;
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rev2->object.flags |= 2;
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insert_by_date(rev1, &list);
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insert_by_date(rev2, &list);
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while (list) {
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struct commit *commit = list->item;
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struct commit_list *tmp = list, *parents;
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int flags = commit->object.flags & 3;
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list = list->next;
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free(tmp);
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switch (flags) {
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case 3:
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insert_by_date(commit, &result);
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continue;
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case 0:
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die("git-merge-base: commit without either parent?");
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}
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parents = commit->parents;
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while (parents) {
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struct commit *p = parents->item;
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parents = parents->next;
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if ((p->object.flags & flags) == flags)
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continue;
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parse_commit(p);
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p->object.flags |= flags;
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insert_by_date(p, &list);
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}
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}
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if (!result)
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return NULL;
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return result->item;
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}
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int main(int argc, char **argv)
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{
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struct commit *rev1, *rev2, *ret;
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unsigned char rev1key[20], rev2key[20];
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if (argc != 3 ||
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get_sha1(argv[1], rev1key) ||
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get_sha1(argv[2], rev2key)) {
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usage("git-merge-base <commit-id> <commit-id>");
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}
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rev1 = lookup_commit_reference(rev1key);
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rev2 = lookup_commit_reference(rev2key);
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if (!rev1 || !rev2)
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return 1;
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ret = common_ancestor(rev1, rev2);
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if (!ret)
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return 1;
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printf("%s\n", sha1_to_hex(ret->object.sha1));
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return 0;
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}
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