$ git clone -n https://src.fedoraproject.org/rpms/rust-fd-lock2.git /var/lib/mock/f38-build-side-43-rust-devel-1411952-31436/root/chroot_tmpdir/scmroot/rust-fd-lock2
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1411952-31436/root/chroot_tmpdir/scmroot/rust-fd-lock2'...
$ git fetch origin e95be529ef4526c212989453fc7fcb8e0118aa0c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-fd-lock2
 * [new ref]         e95be529ef4526c212989453fc7fcb8e0118aa0c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e95be52 Initial Fedora package