$ git clone -n https://src.fedoraproject.org/rpms/s390utils.git /var/lib/mock/f39-build-2550535-61915/root/chroot_tmpdir/scmroot/s390utils
Cloning into '/var/lib/mock/f39-build-2550535-61915/root/chroot_tmpdir/scmroot/s390utils'...
$ git fetch origin 8a3c26800a02938c00ebf75819f1906dbea64e4c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/s390utils
 * [new ref]         8a3c26800a02938c00ebf75819f1906dbea64e4c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8a3c268 - fix upstream kernel installations