$ git clone -n https://src.fedoraproject.org/rpms/rust-ryu.git /var/lib/mock/f45-build-44633-815/root/chroot_tmpdir/scmroot/rust-ryu
Cloning into '/var/lib/mock/f45-build-44633-815/root/chroot_tmpdir/scmroot/rust-ryu'...
$ git fetch origin 0e6219d30b923ab282d44ce309118fe7c0e6c00a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ryu
 * [new ref]         0e6219d30b923ab282d44ce309118fe7c0e6c00a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0e6219d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild