checkout: do not check out unmerged higher stages randomly

diff --git a/t/t7201-co.sh b/t/t7201-co.sh
index 9ad5d635a2881c920fff8e524aea0ed931f68e6c..83a366f1e7dcbe1d1678cadd87b9862713e82b97 100755 (executable)
--- a/t/t7201-co.sh
+++ b/t/t7201-co.sh
@@ -337,4 +337,26 @@ test_expect_success \
     test refs/heads/delete-me = "$(git symbolic-ref HEAD)" &&
     test_must_fail git checkout --track -b track'
 
+test_expect_success 'checkout an unmerged path should fail' '
+       rm -f .git/index &&
+       O=$(echo original | git hash-object -w --stdin) &&
+       A=$(echo ourside | git hash-object -w --stdin) &&
+       B=$(echo theirside | git hash-object -w --stdin) &&
+       (
+               echo "100644 $A 0       fild" &&
+               echo "100644 $O 1       file" &&
+               echo "100644 $A 2       file" &&
+               echo "100644 $B 3       file" &&
+               echo "100644 $A 0       filf"
+       ) | git update-index --index-info &&
+       echo "none of the above" >sample &&
+       cat sample >fild &&
+       cat sample >file &&
+       cat sample >filf &&
+       test_must_fail git checkout fild file filf &&
+       test_cmp sample fild &&
+       test_cmp sample filf &&
+       test_cmp sample file
+'
+
 test_done