$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-sys.git /var/lib/mock/f42-build-side-1-3581416-46829/root/chroot_tmpdir/scmroot/rust-gstreamer-sys
Cloning into '/var/lib/mock/f42-build-side-1-3581416-46829/root/chroot_tmpdir/scmroot/rust-gstreamer-sys'...
$ git fetch origin e08a2fc481b2169029b0028cc5684bb241e459de:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-sys
 * [new ref]         e08a2fc481b2169029b0028cc5684bb241e459de -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e08a2fc Update to version 0.23.6; Fixes RHBZ#2365903