$ git clone -n https://src.fedoraproject.org/rpms/rubygem-redis-client.git /var/lib/mock/f38-build-side-42-init-devel-878363-28475/root/chroot_tmpdir/scmroot/rubygem-redis-client
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-878363-28475/root/chroot_tmpdir/scmroot/rubygem-redis-client'...
$ git fetch origin ff8929b11f10c0eebb4e95573e0bf69a43fe5953:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-redis-client
 * [new ref]         ff8929b11f10c0eebb4e95573e0bf69a43fe5953 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff8929b Initial import (fedora#2166935).