decode file:// and ssh:// URLs

We generally treat these as equivalent to "/path/to/repo"
and "host:path_to_repo" respectively. However, they are URLs
and as such may be percent-encoded. The current code simply
uses them as-is without any decoding.

With this patch, we will now percent-decode any file:// or
ssh:// url (or ssh+git, git+ssh, etc) at the transport
layer. We continue to treat plain paths and "host:path"
syntax literally.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/t5601-clone.sh b/t/t5601-clone.sh
index 678cee5..8abb71a 100755
--- a/t/t5601-clone.sh
+++ b/t/t5601-clone.sh
@@ -176,4 +176,16 @@
 	)
 '
 
+test_expect_success 'respect url-encoding of file://' '
+	git init x+y &&
+	test_must_fail git clone "file://$PWD/x+y" xy-url &&
+	git clone "file://$PWD/x%2By" xy-url
+'
+
+test_expect_success 'do not respect url-encoding of non-url path' '
+	git init x+y &&
+	test_must_fail git clone x%2By xy-regular &&
+	git clone x+y xy-regular
+'
+
 test_done