$ git clone -n https://src.fedoraproject.org/rpms/ga.git /var/lib/mock/f45-build-9391-403/root/chroot_tmpdir/scmroot/ga
Cloning into '/var/lib/mock/f45-build-9391-403/root/chroot_tmpdir/scmroot/ga'...
$ git fetch origin 905d7a89e4a11b98650360c7b114b04e26c851c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ga
 * [new ref]         905d7a89e4a11b98650360c7b114b04e26c851c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 905d7a8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild