$ git clone -n https://src.fedoraproject.org/rpms/rust-zmq.git /var/lib/mock/f41-build-side-1-2924295-34985/root/chroot_tmpdir/scmroot/rust-zmq
Cloning into '/var/lib/mock/f41-build-side-1-2924295-34985/root/chroot_tmpdir/scmroot/rust-zmq'...
$ git fetch origin cdbd65d50ce8146411fc02479be73e680762111b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-zmq
 * [new ref]         cdbd65d50ce8146411fc02479be73e680762111b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cdbd65d unused leaf package for more than two release cycles