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#include "builtin.h"
#include "cache.h"
#include "commit.h"
static int show_merge_base(struct commit *rev1, struct commit *rev2, int show_all)
struct commit_list *result = get_merge_bases(rev1, rev2, 0);
if (!result)
return 1;
while (result) {
printf("%s\n", sha1_to_hex(result->item->object.sha1));
if (!show_all)
return 0;
result = result->next;
return 0;
static const char merge_base_usage[] =
"git merge-base [--all] <commit-id> <commit-id>";
static struct commit *get_commit_reference(const char *arg)
unsigned char revkey[20];
struct commit *r;
if (get_sha1(arg, revkey))
die("Not a valid object name %s", arg);
r = lookup_commit_reference(revkey);
if (!r)
die("Not a valid commit name %s", arg);
return r;
int cmd_merge_base(int argc, const char **argv, const char *prefix)
struct commit *rev1, *rev2;
int show_all = 0;
git_config(git_default_config, NULL);
while (1 < argc && argv[1][0] == '-') {
const char *arg = argv[1];
if (!strcmp(arg, "-a") || !strcmp(arg, "--all"))
show_all = 1;
argc--; argv++;
if (argc != 3)
rev1 = get_commit_reference(argv[1]);
rev2 = get_commit_reference(argv[2]);
return show_merge_base(rev1, rev2, show_all);
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