$ git clone -n https://src.fedoraproject.org/rpms/rust-zstd-sys.git /var/lib/mock/f41-build-side-1-3006302-36744/root/chroot_tmpdir/scmroot/rust-zstd-sys
Cloning into '/var/lib/mock/f41-build-side-1-3006302-36744/root/chroot_tmpdir/scmroot/rust-zstd-sys'...
$ git fetch origin c24a87efd355be9acf26268855c8d32f65cb9c6e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-zstd-sys
 * [new ref]         c24a87efd355be9acf26268855c8d32f65cb9c6e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c24a87e Update to version 2.0.13+zstd.1.5.6; Fixes RHBZ#2302536