$ git clone -n https://src.fedoraproject.org/rpms/crun-vm.git /var/lib/mock/f45-build-39705-750/root/chroot_tmpdir/scmroot/crun-vm
Cloning into '/var/lib/mock/f45-build-39705-750/root/chroot_tmpdir/scmroot/crun-vm'...
$ git fetch origin e840f8aa2ef80a0fd1dd7dfac3e6799ae8e1e6b9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/crun-vm
 * [new ref]         e840f8aa2ef80a0fd1dd7dfac3e6799ae8e1e6b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e840f8a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild