$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-editing-services-sys.git /var/lib/mock/f41-build-side-1-3134824-39762/root/chroot_tmpdir/scmroot/rust-gstreamer-editing-services-sys
Cloning into '/var/lib/mock/f41-build-side-1-3134824-39762/root/chroot_tmpdir/scmroot/rust-gstreamer-editing-services-sys'...
$ git fetch origin 531522db55d6aa85447a8091af1eace7a81adc3c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-editing-services-sys
 * [new ref]         531522db55d6aa85447a8091af1eace7a81adc3c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 531522d no longer needed