$ git clone -n https://src.fedoraproject.org/rpms/ecj.git /var/lib/mock/f45-build-7931-371/root/chroot_tmpdir/scmroot/ecj
Cloning into '/var/lib/mock/f45-build-7931-371/root/chroot_tmpdir/scmroot/ecj'...
$ git fetch origin c86fdc7d2feb415f60b87323b419de3ce0d85d58:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ecj
 * [new ref]         c86fdc7d2feb415f60b87323b419de3ce0d85d58 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c86fdc7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild