Guix build output insufficient

[Pjotr Prins]

On latest

  ./pre-inst guix package -i something

The new color scheme is nice for output. But I miss the old build
logs. How do I get them back? Trying different verbosity levels does
not help.

Also when I got the hash wrong I did not display the new hash value.
And -K does not show the tmp location. E.g.

  ./pre-inst-env guix package -p ~/opt/gdc -i gdc 
--substitute-urls="https://berlin.guixsd.org  https://mirror.hydra.gnu.org"; -K
 (...)

  Build failed: /gnu/store/85salmra99rwz6ifpmswvd9kc5cl69gv-gdc-7a5dbd1.drv - 1 
r:sha256 hash mismatch for output path 
`/gnu/store/wk3sm5krg5srrdivfsjvsz5snd2nqipg-gdc-7a5dbd1'
  expected: 0i0yrcpqrbghq1ddp2zbqq4anl3z5l9fp9b7kblf40642pbdg49d
  actual: 
  -guix package: error: build failed: build of 
`/gnu/store/wp5wr8f4xnc69amc1g8mfb7ypipx5gz0-gdc-v2.082.0-rc.1.drv' failed

Note both points. Am I doing something wrong?

Pj.