$ git clone -n https://src.fedoraproject.org/rpms/cups.git /var/lib/mock/f41-build-side-1-2908285-34734/root/chroot_tmpdir/scmroot/cups
Cloning into '/var/lib/mock/f41-build-side-1-2908285-34734/root/chroot_tmpdir/scmroot/cups'...
$ git fetch origin 8541b295279626fc1bd6c22b263b043a108fa031:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cups
 * [new ref]         8541b295279626fc1bd6c22b263b043a108fa031 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8541b29 Add system-cups.slice