$ git clone -n https://src.fedoraproject.org/rpms/rust-approx.git /var/lib/mock/f45-build-40119-768/root/chroot_tmpdir/scmroot/rust-approx
Cloning into '/var/lib/mock/f45-build-40119-768/root/chroot_tmpdir/scmroot/rust-approx'...
$ git fetch origin a72d84dc5cb30d7b51500748ac8dbed783f9c16b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-approx
 * [new ref]         a72d84dc5cb30d7b51500748ac8dbed783f9c16b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a72d84d Regenerate with rust2rpm v28