$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-player-sys.git /var/lib/mock/f38-build-side-43-rust-devel-1401445-31169/root/chroot_tmpdir/scmroot/rust-gstreamer-player-sys
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1401445-31169/root/chroot_tmpdir/scmroot/rust-gstreamer-player-sys'...
$ git fetch origin 30448f58a8fd823360adc8ea95442601e287aea5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-player-sys
 * [new ref]         30448f58a8fd823360adc8ea95442601e287aea5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 30448f5 Update to 0.21.0