$ git clone -n https://src.fedoraproject.org/rpms/rust-zstd-sys.git /var/lib/mock/f40-build-2658082-66917/root/chroot_tmpdir/scmroot/rust-zstd-sys
Cloning into '/var/lib/mock/f40-build-2658082-66917/root/chroot_tmpdir/scmroot/rust-zstd-sys'...
$ git fetch origin 46efc234c356f45f24a6d967c3c15334ab5fc93a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-zstd-sys
 * [new ref]         46efc234c356f45f24a6d967c3c15334ab5fc93a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 46efc23 Update to version 2.0.9+zstd.1.5.5; Fixes RHBZ#2243313