$ git clone -n https://github.com/xcp-ng-rpms/coreutils.git /var/lib/mock/v8.3-u-pcoval2-10017-28666/root/chroot_tmpdir/scmroot/coreutils
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10017-28666/root/chroot_tmpdir/scmroot/coreutils'...
$ git fetch origin 189f40516ddfc6d6ddddcf065edad77f57f7b6c5:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/coreutils
 * [new ref]         189f40516ddfc6d6ddddcf065edad77f57f7b6c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 189f405 bump release for test build