$ git clone -n https://src.fedoraproject.org/rpms/composer-generators.git /var/lib/mock/f45-build-5843-342/root/chroot_tmpdir/scmroot/composer-generators
Cloning into '/var/lib/mock/f45-build-5843-342/root/chroot_tmpdir/scmroot/composer-generators'...
$ git fetch origin e6f70a0447bf2834fe1668887d881e1a69927cf0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/composer-generators
 * [new ref]         e6f70a0447bf2834fe1668887d881e1a69927cf0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6f70a0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild