Support '-j', '-k' and '-K' in the 'nix' command?

[bgamari]

I find that I often end up having to fall back to nix-build after using nix build as the latter lacks support for the --keep-going and --keep-failed flags.

These are useful flags, that should be supported in one form or another in nix build.

[bhipple]

On a similar note, it would also be nice to be able to pass -jN to nix build and nix run. Since it's a key-value option, it can be passed with the much more verbose --option max-jobs N, but -jN is more convenient and familiar. I haven't figure out if there's a way to pass -k to the nix2 commands and also often fall back to nix-build; this would be great to have!

[lheckemann]

--keep-going works for me with nix build… --keep-failed works too, although it doesn't print the path of the kept build directory.

@bhipple all standard options can be passed without --option as well now, e.g. --max-jobs 4, --no-require-sigs, --substituters ''. In addition to being shorter, this has the benefit of complaining if you make a typo.

[bhipple]

Aha, those are both good to know, thanks @lheckemann! It looks like nix build understands --keep-going but not -k, and understands --max-jobs but not -j. So now instead of dropping to nix-build I can run nix build --keep-going --max-jobs N <cmd>.

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