$ git clone -n https://src.fedoraproject.org/rpms/rust-zstd.git /var/lib/mock/f40-build-1466303-23684/root/chroot_tmpdir/scmroot/rust-zstd
Cloning into '/var/lib/mock/f40-build-1466303-23684/root/chroot_tmpdir/scmroot/rust-zstd'...
$ git fetch origin 6507f0091e4b65b17a47779f1b8a4001dc6dec10:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-zstd
 * [new ref]         6507f0091e4b65b17a47779f1b8a4001dc6dec10 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6507f00 Update to version 0.13.2; Fixes RHBZ#2296077