guix/corepkgs/fetchurl/default.nix

{system, url, md5}:

derivation {
  name = baseNameOf (toString url);
  builder = ./builder.sh;
  id = md5;
  inherit system url md5;
}
* Channels. These allow you to stay current with an evolving set of Nix expressions. To subscribe to a channel (needs to be done only once): nix-channel --add \ http://catamaran.labs.cs.uu.nl/dist/nix/channels/nixpkgs-unstable This just adds the given URL to ~/.nix-channels (which can also be edited manually). To update from all channels: nix-channel --update This fetches the latest expressions and pulls cache manifests. The default Nix expression (~/.nix-defexpr) is made to point to the conjunction of the expressions downloaded from all channels. So to update all installed derivations in the current user environment: nix-channel --update nix-env --upgrade '*' If you are really courageous, you can put this in a cronjob or something. You can subscribe to multiple channels. It is not entirely clear what happens when there are name clashes between derivations from different channels. From nix-env/main.cc it appears that the one with the lowest (highest?) hash will be used, which is pretty meaningless. 2004-04-21 14:54:05 +00:00			`{system, url, md5}:`

			`derivation {`
* Maintain integrity of the substitute and successor mappings when deleting a path in the store. * Allow absolute paths in Nix expressions. * Get nix-prefetch-url to work again. * Various other fixes. 2003-11-22 18:45:56 +00:00			`name = baseNameOf (toString url);`
			`builder = ./builder.sh;`
			`id = md5;`
* Channels. These allow you to stay current with an evolving set of Nix expressions. To subscribe to a channel (needs to be done only once): nix-channel --add \ http://catamaran.labs.cs.uu.nl/dist/nix/channels/nixpkgs-unstable This just adds the given URL to ~/.nix-channels (which can also be edited manually). To update from all channels: nix-channel --update This fetches the latest expressions and pulls cache manifests. The default Nix expression (~/.nix-defexpr) is made to point to the conjunction of the expressions downloaded from all channels. So to update all installed derivations in the current user environment: nix-channel --update nix-env --upgrade '*' If you are really courageous, you can put this in a cronjob or something. You can subscribe to multiple channels. It is not entirely clear what happens when there are name clashes between derivations from different channels. From nix-env/main.cc it appears that the one with the lowest (highest?) hash will be used, which is pretty meaningless. 2004-04-21 14:54:05 +00:00			`inherit system url md5;`
* Maintain integrity of the substitute and successor mappings when deleting a path in the store. * Allow absolute paths in Nix expressions. * Get nix-prefetch-url to work again. * Various other fixes. 2003-11-22 18:45:56 +00:00			`}`