$ git clone -n https://github.com/xcp-ng-rpms/cmake3 /var/lib/mock/v8.3-incoming-10649-29203/root/chroot_tmpdir/scmroot/cmake3
Cloning into '/var/lib/mock/v8.3-incoming-10649-29203/root/chroot_tmpdir/scmroot/cmake3'...
$ git fetch origin 23aa428ad3197e3c37968c272ecbb681da662a33:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/cmake3
 * [new ref]         23aa428ad3197e3c37968c272ecbb681da662a33 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 23aa428 Merge pull request #2 from xcp-ng-rpms/pcoval/review/master