multi-pack-index: add 'write' verb

diff --git a/t/t7009-filter-branch-null-sha1.sh b/t/t7009-filter-branch-null-sha1.sh
index c27f90f285faf0529f08fae7262a40b605bd7375..9ba9f24ad2fb4bd2c38a722e62577789fe36f09a 100755 (executable)
--- a/t/t7009-filter-branch-null-sha1.sh
+++ b/t/t7009-filter-branch-null-sha1.sh
@@ -12,7 +12,7 @@ test_expect_success 'setup: base commits' '
 test_expect_success 'setup: a commit with a bogus null sha1 in the tree' '
        {
                git ls-tree HEAD &&
-               printf "160000 commit $_z40\\tbroken\\n"
+               printf "160000 commit $ZERO_OID\\tbroken\\n"
        } >broken-tree &&
        echo "add broken entry" >msg &&
 
@@ -31,6 +31,12 @@ test_expect_success 'setup: bring HEAD and index in sync' '
        git commit -a -m "back to normal"
 '
 
+test_expect_success 'noop filter-branch complains' '
+       test_must_fail git filter-branch \
+               --force --prune-empty \
+               --index-filter "true"
+'
+
 test_expect_success 'filter commands are still checked' '
        test_must_fail git filter-branch \
                --force --prune-empty \