Commits on Sep 18, 2018

1. stdenv: Validate meta.outputsToInstall …

   If meta.outputsToInstall is set to include absent outputs, various
   tools break including channel updates and nix-env.
   
       grahamc@Morbo> nix-env -i -f . -A elf-header-real
       installing 'elf-header'
       error: this derivation has bad 'meta.outputsToInstall'
   
   This patch verifies each value in meta.outputsToInstall is a valid
   output. It validates this condition only if checkMeta is true.
   
       grahamc@Morbo> nix-build . -A elf-header-real
       error: Package ‘elf-header’ in /home/grahamc/projects/nixpkgs/pkgs/development/libraries/elf-header/default.nix:36 has invalid meta.outputsToInstall, refusing to evaluate.
   
       The package elf-header has set meta.outputsToInstall to: bin
   
       however elf-header only has the outputs: out
   
       and is missing the following ouputs:
   
         - bin
   
       (use '--show-trace' to show detailed location information)
   
   Note, now the nix-env experience is decidedly worse for users who have
   checkMeta set to true:
   
       grahamc@Morbo> nix-env -i -f . -A elf-header-real; echo $?
       0
   
   though since this is already an issue for unfree, broken, unsupported,
   and insecure validity problems I'm not sure we should do something
   different here.

   

   grahamc committed Sep 18, 2018
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2. elf-header-real: fixup outputsToInstall

   

   grahamc committed Sep 18, 2018
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