$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-base.git /var/lib/mock/f42-build-side-1-3588004-46941/root/chroot_tmpdir/scmroot/rust-gstreamer-base
Cloning into '/var/lib/mock/f42-build-side-1-3588004-46941/root/chroot_tmpdir/scmroot/rust-gstreamer-base'...
$ git fetch origin a06a332d5ac6d29253643e1c2f715d8964a5f38e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-base
 * [new ref]         a06a332d5ac6d29253643e1c2f715d8964a5f38e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a06a332 Update to version 0.23.6; Fixes RHBZ#2365897