$ git clone -n https://src.fedoraproject.org/rpms/rust-serde-xml-rs0.4.git /var/lib/mock/f45-build-44835-818/root/chroot_tmpdir/scmroot/rust-serde-xml-rs0.4
Cloning into '/var/lib/mock/f45-build-44835-818/root/chroot_tmpdir/scmroot/rust-serde-xml-rs0.4'...
$ git fetch origin 2a7b37fa32e32a25eeb3e984b89bcfe68beb8984:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde-xml-rs0.4
 * [new ref]         2a7b37fa32e32a25eeb3e984b89bcfe68beb8984 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2a7b37f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild