nix-super/corepkgs/buildenv/default.nix

{system, derivations, manifest}:

derivation { 
  name = "user-environment";
  system = system;
  builder = ./builder.pl;
  derivations = derivations;
  manifest = manifest;

  # !!! grmbl, need structured data for passing this in a clean way.
  active = map (x: if x ? meta && x.meta ? active then x.meta.active else "true") derivations;
}
* nix-env: a tool to manage user environments. * Replace all directory reading code by a generic readDirectory() function. 2003-11-19 19:27:16 +02:00			`{system, derivations, manifest}:`

			`derivation {`
			`name = "user-environment";`
			`system = system;`
			`builder = ./builder.pl;`
			`derivations = derivations;`
			`manifest = manifest;`
* Allow conflicting packages to be kept in a user environment, and allow switching between them (NIX-80). Example: two versions of Pan: $ nix-env -q pan pan-0.128 pan-0.14.2.91 $ readlink $(which pan) /nix/store/l38jrbilw269drpjkx7kinhrxj6fjh59-pan-0.14.2.91/bin/pan At most one of them can be active any given time. Assuming than 0.14.2.91 is active, you can active 0.128 as follows: $ nix-env --set-flag active false pan-0.14.2.91 $ nix-env --set-flag active true pan-0.128 $ readlink $(which pan) /nix/store/nziqwnlzy7xl385kglxhg75pfl5i936n-pan-0.128/bin/pan More flags to follow. 2007-04-28 01:40:59 +03:00
			`# !!! grmbl, need structured data for passing this in a clean way.`
			`active = map (x: if x ? meta && x.meta ? active then x.meta.active else "true") derivations;`
* nix-env: a tool to manage user environments. * Replace all directory reading code by a generic readDirectory() function. 2003-11-19 19:27:16 +02:00			`}`