$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-base.git /var/lib/mock/f40-build-2115761-50694/root/chroot_tmpdir/scmroot/rust-gstreamer-base
Cloning into '/var/lib/mock/f40-build-2115761-50694/root/chroot_tmpdir/scmroot/rust-gstreamer-base'...
$ git fetch origin 39203a5db595ea353318bce054cb3804b6a63b5b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-base
 * [new ref]         39203a5db595ea353318bce054cb3804b6a63b5b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39203a5 Regenerate with rust2rpm v25