guix challenge exit status

[John Darrington <john@darrington.wattle.id.au>]

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Ludo recently fixed a problem with the exit status of "guix challenge".
So now it (correctly) returns zero if the challenge is succesfull, and
non-zero otherwise.

It would be very useful however, if it would return a *different* 
non-zero if the challenge fails from when the challenge is inconclusive.

For example, the current behaviour seems to be:



Unsuccessful Challenge:
----------------------

guix challenge perl-algorithm-diff ; echo $?
updating list of substitutes from 'http://mirror.hydra.gnu.org'... 100.0%
updating list of substitutes from 'http://hydra.gnu.org'... 100.0%
/gnu/store/ffs9llk3jrvq5qriwhx8swqz4pklzrwr-perl-algorithm-diff-1.1903 contents differ:
  local hash: 057h2zjp5ppziqq2g0c098rghkc9y2dsh2s2kvmywj06k29khhmc
  http://mirror.hydra.gnu.org/nar/ffs9llk3jrvq5qriwhx8swqz4pklzrwr-perl-algorithm-diff-1.1903: 0w6xvsnh9rn8h42xlc7v1m508g129b5zi2p6p2nizrxcyam9s4nk
  http://hydra.gnu.org/nar/ffs9llk3jrvq5qriwhx8swqz4pklzrwr-perl-algorithm-diff-1.1903: 0w6xvsnh9rn8h42xlc7v1m508g129b5zi2p6p2nizrxcyam9s4nk
1


Inconclusive Challenge:
----------------------

Guix> guix challenge pspp ; echo $?
updating list of substitutes from 'http://mirror.hydra.gnu.org'... 100.0%
updating list of substitutes from 'http://hydra.gnu.org'... 100.0%
guix challenge: warning: no local build for '/gnu/store/0sdvdn9cjc1qikmgyh8qhi4r7lfnam18-pspp-0.10.1'
guix challenge: error: no substitutes for '/gnu/store/0sdvdn9cjc1qikmgyh8qhi4r7lfnam18-pspp-0.10.1'
1


...

Guix> guix build pspp
...

Succesfull Challenge:
--------------------

Guix> guix challenge pspp ; echo $?
updating list of substitutes from 'http://mirror.hydra.gnu.org'... 100.0%
updating list of substitutes from 'http://hydra.gnu.org'... 100.0%
0



I suggest returning 2 in the inconclusive case.


J'



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