$ git clone -n https://src.fedoraproject.org/rpms/rakudo.git /var/lib/mock/f45-build-34290-683/root/chroot_tmpdir/scmroot/rakudo
Cloning into '/var/lib/mock/f45-build-34290-683/root/chroot_tmpdir/scmroot/rakudo'...
$ git fetch origin 7246e54744b9690ea1bb2673d1afb062fe39b193:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rakudo
 * [new ref]         7246e54744b9690ea1bb2673d1afb062fe39b193 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7246e54 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild