$ git clone -n https://src.fedoraproject.org/rpms/gammaray.git /var/lib/mock/f41-build-1034969-18652/root/chroot_tmpdir/scmroot/gammaray
Cloning into '/var/lib/mock/f41-build-1034969-18652/root/chroot_tmpdir/scmroot/gammaray'...
$ git fetch origin fa5223e16049dc2458ab830d8fe85a797e805ec0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gammaray
 * [new ref]         fa5223e16049dc2458ab830d8fe85a797e805ec0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fa5223e Rebuild (qt5)