mirror of
https://github.com/git/git.git
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3c249c9506
This allows the programs to use various simplified versions of the SHA1 names, eg just say "HEAD" for the SHA1 pointed to by the .git/HEAD file etc. For example, this commit has been done with git-commit-tree $(git-write-tree) -p HEAD instead of the traditional "$(cat .git/HEAD)" syntax.
72 lines
1.6 KiB
C
72 lines
1.6 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 *process_list(struct commit_list **list_p, int this_mark,
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int other_mark)
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{
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struct commit *item = (*list_p)->item;
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if (item->object.flags & other_mark) {
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return item;
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} else {
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pop_most_recent_commit(list_p, this_mark);
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}
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return NULL;
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}
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struct commit *common_ancestor(struct commit *rev1, struct commit *rev2)
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{
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struct commit_list *rev1list = NULL;
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struct commit_list *rev2list = NULL;
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commit_list_insert(rev1, &rev1list);
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rev1->object.flags |= 0x1;
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commit_list_insert(rev2, &rev2list);
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rev2->object.flags |= 0x2;
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parse_commit(rev1);
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parse_commit(rev2);
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while (rev1list || rev2list) {
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struct commit *ret;
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if (!rev1list) {
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// process 2
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ret = process_list(&rev2list, 0x2, 0x1);
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} else if (!rev2list) {
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// process 1
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ret = process_list(&rev1list, 0x1, 0x2);
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} else if (rev1list->item->date < rev2list->item->date) {
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// process 2
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ret = process_list(&rev2list, 0x2, 0x1);
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} else {
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// process 1
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ret = process_list(&rev1list, 0x1, 0x2);
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}
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if (ret) {
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free_commit_list(rev1list);
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free_commit_list(rev2list);
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return ret;
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}
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}
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return NULL;
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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("merge-base <commit-id> <commit-id>");
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}
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rev1 = lookup_commit(rev1key);
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rev2 = lookup_commit(rev2key);
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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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