$ git clone -n https://src.fedoraproject.org/rpms/gammaray.git /var/lib/mock/f42-bootstrap-3533706-46421/root/chroot_tmpdir/scmroot/gammaray
Cloning into '/var/lib/mock/f42-bootstrap-3533706-46421/root/chroot_tmpdir/scmroot/gammaray'...
$ git fetch origin 359044706a20feef0834f8daa4e18ca438aeb4fa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gammaray
 * [new ref]         359044706a20feef0834f8daa4e18ca438aeb4fa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3590447 Rebuild (qt5)