$ git clone -n https://src.fedoraproject.org/rpms/marsshooter.git /var/lib/mock/f45-build-18040-507/root/chroot_tmpdir/scmroot/marsshooter
Cloning into '/var/lib/mock/f45-build-18040-507/root/chroot_tmpdir/scmroot/marsshooter'...
$ git fetch origin 340f1ad3c8faded5fa239c2d4b217ef7d989f186:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/marsshooter
 * [new ref]         340f1ad3c8faded5fa239c2d4b217ef7d989f186 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 340f1ad Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild