$ git clone -n https://src.fedoraproject.org/rpms/rust-lz4-sys.git /var/lib/mock/f45-build-43085-800/root/chroot_tmpdir/scmroot/rust-lz4-sys
Cloning into '/var/lib/mock/f45-build-43085-800/root/chroot_tmpdir/scmroot/rust-lz4-sys'...
$ git fetch origin 48c5fdea9c92c7ac3118f61759b87c1b513c3f74:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-lz4-sys
 * [new ref]         48c5fdea9c92c7ac3118f61759b87c1b513c3f74 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 48c5fde Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild