$ git clone -n https://src.fedoraproject.org/rpms/rust-xz2.git /var/lib/mock/f40-build-2157641-50931/root/chroot_tmpdir/scmroot/rust-xz2
Cloning into '/var/lib/mock/f40-build-2157641-50931/root/chroot_tmpdir/scmroot/rust-xz2'...
$ git fetch origin ed9dad32d3853623de759825c6b1a94227350487:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-xz2
 * [new ref]         ed9dad32d3853623de759825c6b1a94227350487 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ed9dad3 Regenerate with rust2rpm v24