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-rw-r--r--builtin/merge.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/builtin/merge.c b/builtin/merge.c
index 101ffef..e3db41b 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -64,6 +64,7 @@ static int option_renormalize;
static int verbosity;
static int allow_rerere_auto;
static int abort_current_merge;
+static int allow_unrelated_histories;
static int show_progress = -1;
static int default_to_upstream = 1;
static const char *sign_commit;
@@ -221,6 +222,8 @@ static struct option builtin_merge_options[] = {
OPT__VERBOSITY(&verbosity),
OPT_BOOL(0, "abort", &abort_current_merge,
N_("abort the current in-progress merge")),
+ OPT_BOOL(0, "allow-unrelated-histories", &allow_unrelated_histories,
+ N_("allow merging unrelated histories")),
OPT_SET_INT(0, "progress", &show_progress, N_("force progress reporting"), 1),
{ OPTION_STRING, 'S', "gpg-sign", &sign_commit, N_("key-id"),
N_("GPG sign commit"), PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
@@ -1397,9 +1400,12 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
update_ref("updating ORIG_HEAD", "ORIG_HEAD", head_commit->object.oid.hash,
NULL, 0, UPDATE_REFS_DIE_ON_ERR);
- if (remoteheads && !common)
- ; /* No common ancestors found. We need a real merge. */
- else if (!remoteheads ||
+ if (remoteheads && !common) {
+ /* No common ancestors found. */
+ if (!allow_unrelated_histories)
+ die(_("refusing to merge unrelated histories"));
+ /* otherwise, we need a real merge. */
+ } else if (!remoteheads ||
(!remoteheads->next && !common->next &&
common->item == remoteheads->item)) {
/*