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authorEelco Dolstra <e.dolstra@tudelft.nl>2007-02-02T01·52+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2007-02-02T01·52+0000
commit451dbf687f65b42d70e64c3858771abaab51b356 (patch)
tree2954eb3c33c2d3800ac1f4296d4c694613485079 /src/libexpr/parser.hh
parentf52de527c7743d8fe28574f02b632566a1006244 (diff)
* nix-env now maintains meta info (from the `meta' derivation
  attribute) about installed packages in user environments.  Thus, an
  operation like `nix-env -q --description' shows useful information
  not only on available packages but also on installed packages.

* nix-env now passes the entire manifest as an argument to the Nix
  expression of the user environment builder (not just a list of
  paths), so that in particular the user environment builder has
  access to the meta attributes.
  
* New operation `--set-flag' in nix-env to change meta info of
  installed packages.  This will be useful to pass per-package
  policies to the user environment builder (e.g., how to resolve
  collision or whether to disable a package (NIX-80)) or upgrade
  policies in nix-env (e.g., that a package should be "masked", that
  is, left untouched by upgrade actions).  Example:

  $ nix-env --set-flag enabled false ghc-6.4


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