$ git clone -n https://src.fedoraproject.org/rpms/cmake.git /var/lib/mock/f42-bootstrap-3462124-45558/root/chroot_tmpdir/scmroot/cmake
Cloning into '/var/lib/mock/f42-bootstrap-3462124-45558/root/chroot_tmpdir/scmroot/cmake'...
$ git fetch origin ec2c611bca28b0106f4d84fc3506bcaac746e1ee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cmake
 * [new ref]         ec2c611bca28b0106f4d84fc3506bcaac746e1ee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ec2c611 Disable bootstrap build