$ git clone -n https://github.com/xcp-ng-rpms/coreutils.git /var/lib/mock/v8.3-u-pcoval2-10019-28666/root/chroot_tmpdir/scmroot/coreutils
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10019-28666/root/chroot_tmpdir/scmroot/coreutils'...
$ git fetch origin 73aa71ace78271f253252ef5676a586a42c75106:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/coreutils
 * [new ref]         73aa71ace78271f253252ef5676a586a42c75106 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 73aa71a bump release for test build