$ git clone -n https://src.fedoraproject.org/rpms/rust-xmlwriter.git /var/lib/mock/f45-build-46225-832/root/chroot_tmpdir/scmroot/rust-xmlwriter
Cloning into '/var/lib/mock/f45-build-46225-832/root/chroot_tmpdir/scmroot/rust-xmlwriter'...
$ git fetch origin 9f64730e2b56adec6fa6c453858f834ed1977cc5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-xmlwriter
 * [new ref]         9f64730e2b56adec6fa6c453858f834ed1977cc5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9f64730 Regenerate with rust2rpm v28