$ git clone -n https://src.fedoraproject.org/rpms/Io-language.git /var/lib/mock/f40-build-2600169-63094/root/chroot_tmpdir/scmroot/Io-language
Cloning into '/var/lib/mock/f40-build-2600169-63094/root/chroot_tmpdir/scmroot/Io-language'...
$ git fetch origin 3bffdbbe49acc517612ca98aee3d65561b9467cc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/Io-language
 * [new ref]         3bffdbbe49acc517612ca98aee3d65561b9467cc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3bffdbb Patch for stricter flags.