$ git clone -n https://src.fedoraproject.org/rpms/zstd.git /var/lib/mock/f41-build-807956-145557/root/chroot_tmpdir/scmroot/zstd
Cloning into '/var/lib/mock/f41-build-807956-145557/root/chroot_tmpdir/scmroot/zstd'...
$ git fetch origin 4174c35b40e994e9abf6911756e60481ff43e395:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/zstd
 * [new ref]         4174c35b40e994e9abf6911756e60481ff43e395 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4174c35 latest upstream (1.5.6)