$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-allocators-sys /var/lib/mock/f42-build-3428994-45391/root/chroot_tmpdir/scmroot/rust-gstreamer-allocators-sys
Cloning into '/var/lib/mock/f42-build-3428994-45391/root/chroot_tmpdir/scmroot/rust-gstreamer-allocators-sys'...
$ git fetch origin 7c266fb08647010d45b300535933cdc8d996f4ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-allocators-sys
 * [new ref]         7c266fb08647010d45b300535933cdc8d996f4ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7c266fb Update to version 0.23.5; Fixes RHBZ#2333662