$ git clone -n https://src.fedoraproject.org/rpms/libuser.git /var/lib/mock/f40-build-784871-133654/root/chroot_tmpdir/scmroot/libuser
Cloning into '/var/lib/mock/f40-build-784871-133654/root/chroot_tmpdir/scmroot/libuser'...
$ git fetch origin 16cdc179c8712d7850c4f5fd227566740413250a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libuser
 * [new ref]         16cdc179c8712d7850c4f5fd227566740413250a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 16cdc17 Deprecating libuser