$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-pbutils-sys.git /var/lib/mock/f38-build-side-43-rust-devel-1397443-31052/root/chroot_tmpdir/scmroot/rust-gstreamer-pbutils-sys
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1397443-31052/root/chroot_tmpdir/scmroot/rust-gstreamer-pbutils-sys'...
$ git fetch origin bb208f748140d49ac1844305f618e0a46c9ad2e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-pbutils-sys
 * [new ref]         bb208f748140d49ac1844305f618e0a46c9ad2e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bb208f7 Update to 0.21.0