$ git clone -n https://src.fedoraproject.org/rpms/rust-serde-xml-rs.git /var/lib/mock/f38-build-side-43-rust-devel-1417900-31459/root/chroot_tmpdir/scmroot/rust-serde-xml-rs
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1417900-31459/root/chroot_tmpdir/scmroot/rust-serde-xml-rs'...
$ git fetch origin b808d6f9c24ebc2a3cb5e66d5f83f74bde7f6da8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde-xml-rs
 * [new ref]         b808d6f9c24ebc2a3cb5e66d5f83f74bde7f6da8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b808d6f Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild