$ git clone -n https://src.fedoraproject.org/rpms/rust-zerocopy0.6.git /var/lib/mock/f40-build-2270190-54793/root/chroot_tmpdir/scmroot/rust-zerocopy0.6
Cloning into '/var/lib/mock/f40-build-2270190-54793/root/chroot_tmpdir/scmroot/rust-zerocopy0.6'...
$ git fetch origin 53e3977a318c560d403ab9077b50f409217300be:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-zerocopy0.6
 * [new ref]         53e3977a318c560d403ab9077b50f409217300be -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 53e3977 Update to version 0.6.6