$ git clone -n https://github.com/xcp-ng-rpms/coreutils.git /var/lib/mock/v8.3-u-pcoval2-10557-29112/root/chroot_tmpdir/scmroot/coreutils
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10557-29112/root/chroot_tmpdir/scmroot/coreutils'...
$ git fetch origin 616fdbc60eacd5c61cc3cd2ac92e4df08a0eba5e:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/coreutils
 * [new ref]         616fdbc60eacd5c61cc3cd2ac92e4df08a0eba5e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 616fdbc bump release for test build