$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer.git /var/lib/mock/f38-build-side-43-rust-devel-1399863-31143/root/chroot_tmpdir/scmroot/rust-gstreamer
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1399863-31143/root/chroot_tmpdir/scmroot/rust-gstreamer'...
$ git fetch origin 059e788eece47ad56b2115228d968f1dc52d4482:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer
 * [new ref]         059e788eece47ad56b2115228d968f1dc52d4482 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 059e788 Update to 0.21.0