$ git clone -n https://github.com/xcp-ng-rpms/coreutils.git /var/lib/mock/v8.3-incoming-9044-27920/root/chroot_tmpdir/scmroot/coreutils
Cloning into '/var/lib/mock/v8.3-incoming-9044-27920/root/chroot_tmpdir/scmroot/coreutils'...
$ git fetch origin 8d2df513c0b14d5d50c058f112b80c868d2762d2:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/coreutils
 * [new ref]         8d2df513c0b14d5d50c058f112b80c868d2762d2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8d2df51 Import coreutils-8.22-22.xs8.src.rpm