$ git clone -n https://src.fedoraproject.org/rpms/rust-data-url0.2.git /var/lib/mock/f39-build-1663273-40668/root/chroot_tmpdir/scmroot/rust-data-url0.2
Cloning into '/var/lib/mock/f39-build-1663273-40668/root/chroot_tmpdir/scmroot/rust-data-url0.2'...
$ git fetch origin 552b46290c6545bd9633f68c81f75693c77b5028:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-data-url0.2
 * [new ref]         552b46290c6545bd9633f68c81f75693c77b5028 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 552b462 Initial import (data-url 0.2 compat package)