$ git clone -n https://src.fedoraproject.org/rpms/rust-libsodium-sys.git /var/lib/mock/f41-build-side-1-3134846-39762/root/chroot_tmpdir/scmroot/rust-libsodium-sys
Cloning into '/var/lib/mock/f41-build-side-1-3134846-39762/root/chroot_tmpdir/scmroot/rust-libsodium-sys'...
$ git fetch origin 5433a4eeafe921802e06a751e962b0d91aeb49b5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-libsodium-sys
 * [new ref]         5433a4eeafe921802e06a751e962b0d91aeb49b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5433a4e unused leaf package for more than two release cycles