$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer.git /var/lib/mock/f42-build-side-1-3589213-46954/root/chroot_tmpdir/scmroot/rust-gstreamer
Cloning into '/var/lib/mock/f42-build-side-1-3589213-46954/root/chroot_tmpdir/scmroot/rust-gstreamer'...
$ git fetch origin 60c1c197b34aef6ece77a21106b7f26336dcbc8a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer
 * [new ref]         60c1c197b34aef6ece77a21106b7f26336dcbc8a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 60c1c19 Update to version 0.23.7