filter-repo: fix crash from assuming parent is an int

When filtering with --refs, parents can be a hash rather than an
integer.  There was a code path in RepoFilter._prunable() that was
written assuming the first parent would always be an integer; fix it to
handle a hash as well.

Reported-by: Niklas Hambüchen <mail@nh2.me>
Signed-off-by: Elijah Newren <newren@gmail.com>

git-filter-repo

@@ -3191,7 +3191,10 @@ class RepoFilter(object):
     for change in commit.file_changes:
       parent = new_1st_parent or commit.parents[0] # exists due to above checks
       quoted_filename = PathQuoting.enquote(change.filename)
-      self._output.write(b"ls :%d %s\n" % (parent, quoted_filename))
+      if isinstance(parent, int):
+        self._output.write(b"ls :%d %s\n" % (parent, quoted_filename))
+      else:
+        self._output.write(b"ls %s %s\n" % (parent, quoted_filename))
       self._output.flush()
       parent_version = fi_output.readline().split()
       if change.type == b'D':

t/t9390-filter-repo.sh

@@ -1324,6 +1324,28 @@ test_expect_success '--refs' '
 	test_cmp refs/expect refs/actual
 '
 
+test_expect_success '--refs and --replace-text' '
+	# This test exists to make sure we do not assume that parents in
+	# filter-repo code are always represented by integers (or marks);
+	# they sometimes are represented as hashes.
+	setup_path_rename &&
+	(
+		git clone file://"$(pwd)"/path_rename refs_and_replace_text &&
+		cd refs_and_replace_text &&
+		git rev-parse --short=10 HEAD~1 >myparent &&
+		git filter-repo --force --replace-text <(echo "10==>TEN") --refs $(cat myparent)..master &&
+		cat <<-EOF >expect &&
+		TEN11
+		EOF
+		test_cmp expect sequences/medium &&
+		git rev-list --count HEAD >actual &&
+		echo 4 >expect &&
+		test_cmp expect actual &&
+		git rev-parse --short=10 HEAD~1 >actual &&
+		test_cmp myparent actual
+	)
+'
+
 test_expect_success 'reset to specific refs' '
 	test_create_repo reset_to_specific_refs &&
 	(