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-rw-r--r--builtin/update-ref.c2
-rwxr-xr-xt/t1400-update-ref.sh11
2 files changed, 13 insertions, 0 deletions
diff --git a/builtin/update-ref.c b/builtin/update-ref.c
index bb65129012..6029a80544 100644
--- a/builtin/update-ref.c
+++ b/builtin/update-ref.c
@@ -436,6 +436,8 @@ static void update_refs_stdin(void)
switch (state) {
case UPDATE_REFS_OPEN:
case UPDATE_REFS_STARTED:
+ if (state == UPDATE_REFS_STARTED && cmd->state == UPDATE_REFS_STARTED)
+ die("cannot restart ongoing transaction");
/* Do not downgrade a transaction to a non-transaction. */
if (cmd->state >= state)
state = cmd->state;
diff --git a/t/t1400-update-ref.sh b/t/t1400-update-ref.sh
index 3144e98b31..31b64be521 100755
--- a/t/t1400-update-ref.sh
+++ b/t/t1400-update-ref.sh
@@ -1583,4 +1583,15 @@ test_expect_success 'transaction can commit after abort' '
test_cmp expect actual
'
+test_expect_success 'transaction cannot restart ongoing transaction' '
+ cat >stdin <<-EOF &&
+ start
+ create refs/heads/restart $A
+ start
+ commit
+ EOF
+ test_must_fail git update-ref --stdin <stdin >actual &&
+ test_must_fail git show-ref --verify refs/heads/restart
+'
+
test_done