$ git clone -n https://src.fedoraproject.org/rpms/rust-zopfli.git /var/lib/mock/f42-build-3252961-41225/root/chroot_tmpdir/scmroot/rust-zopfli
Cloning into '/var/lib/mock/f42-build-3252961-41225/root/chroot_tmpdir/scmroot/rust-zopfli'...
$ git fetch origin 04d7c4178a83baad3e5cfc178373d3feb5ae6b8a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-zopfli
 * [new ref]         04d7c4178a83baad3e5cfc178373d3feb5ae6b8a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 04d7c41 Improve a regex in the .rpmlintrc file