these 8 derivations will be built:
  /nix/store/62a9kc43rz4a5m0y0v060v1m2k2c83yv-spaces-probe-notifying.drv
  /nix/store/fd9xq3hhnk4mjargv310w8acm896pna4-spaces-probe-notifying-timed.drv
  /nix/store/fdd2734ph7za9isfcg8pigz7f2ygq7xv-spaces-probe-ok.drv
  /nix/store/g0k8xndprrbmmk7x28am6rhadyidfwmn-spaces-probe-notifying-fail.drv
  /nix/store/i2lva1syb15jj9lrir3g70xbih3dylmy-spaces-probe-reason.drv
  /nix/store/lzbarz3lipa1n20byy79is399vdr828n-spaces-probe-reason-ok.drv
  /nix/store/wbm4lk6hwym823r6fknwjsw7136q6mc5-spaces-probe-failing.drv
  /nix/store/3db4misb1iyv3riyrzhzcx201kdhvwwz-spaces-command-wrapper-test.drv