$ git clone -n https://src.fedoraproject.org/rpms/rust-serde-xml-rs.git /var/lib/mock/f45-build-44834-818/root/chroot_tmpdir/scmroot/rust-serde-xml-rs
Cloning into '/var/lib/mock/f45-build-44834-818/root/chroot_tmpdir/scmroot/rust-serde-xml-rs'...
$ git fetch origin 31266f4afa58cb746d975e30d91af938e091e717:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde-xml-rs
 * [new ref]         31266f4afa58cb746d975e30d91af938e091e717 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 31266f4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild