$ git clone -n https://src.fedoraproject.org/rpms/rust-zstd-sys.git /var/lib/mock/f40-build-2326328-58830/root/chroot_tmpdir/scmroot/rust-zstd-sys
Cloning into '/var/lib/mock/f40-build-2326328-58830/root/chroot_tmpdir/scmroot/rust-zstd-sys'...
$ git fetch origin 64a0d55d037e48787156c97d918d8b4fc6746534:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-zstd-sys
 * [new ref]         64a0d55d037e48787156c97d918d8b4fc6746534 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 64a0d55 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild