Re: fixing --check saying outputs not valid

[Dave Love]

Ludovic Courtès <address@hidden> writes:

> To run --check, you must first already have the store item(s) available.
>
> So you would first run:
>
>   guix build hwloc
>
> which will ensure both hwloc and hwloc:lib are in your store, possibly
> by downloading substitutes.
>
> Then you can run “guix build hwloc --check -L --no-grafts”, which will
> build hwloc locally and raise an error if hwloc:{out,lib} are not
> bit-identical to what you had in store.

[Should that be documented as the procedure to use?]

The trouble is that I don't get a second build with --check:

  $ ./pre-inst-env guix build hwloc --check -L --no-grafts
  guile: warning: failed to install locale
  warning: failed to install locale: Invalid argument
  @ build-started /gnu/store/7d2lk82ak7n0awbr1k5bllwfc43dicsl-hwloc-1.11.8.drv 
- x86_64-linux 
/var/log/guix/drvs/7d//2lk82ak7n0awbr1k5bllwfc43dicsl-hwloc-1.11.8.drv.bz2
  grafting '/gnu/store/n2l4ryq1572wnfh4yxljjbh2q40v6jr0-hwloc-1.11.8-debug' -> 
'/gnu/store/dgfpcmkx7wzxjj3d1q6l5dmzjr9z6wz5-hwloc-1.11.8-debug'...
  grafting '/gnu/store/hf6k2i6aqqs50p181bs1aa7xw49kd6xn-hwloc-1.11.8-lib' -> 
'/gnu/store/jrxiynx443d894and51pa8bylaib0bkc-hwloc-1.11.8-lib'...
  grafting '/gnu/store/f969ab3pfvgn28xc812h97jsyif2z5vs-hwloc-1.11.8' -> 
'/gnu/store/2mind69xpdx8wv6ixmjix0f12dd2qb2v-hwloc-1.11.8'...
  /gnu/store/dgfpcmkx7wzxjj3d1q6l5dmzjr9z6wz5-hwloc-1.11.8-debug
  /gnu/store/jrxiynx443d894and51pa8bylaib0bkc-hwloc-1.11.8-lib
  /gnu/store/2mind69xpdx8wv6ixmjix0f12dd2qb2v-hwloc-1.11.8

> Makes sense?
>
> (The “--no-grafts” part is because what you care about is the actual
> build of hwloc, not the grafting derivation.)
>
> Ludo’.