nixpkgs/lib/meta.nix
Eelco Dolstra 8890492872 openjdk: Ugly hack to fix nix-env installation
Nix-env always wants to install all outputs of a derivation, but this
failed for openjdk/openjre because openjdk has some symlinks (such as
bin/java) to openjre.  Also, it prevents installing the openjre
without the openjdk.  So as a workaround, mess with the "outputs"
attribute to fool nix-env.

Also, give openjre a separate name and description.

Fixes #1535.
2014-01-20 14:58:09 +01:00

68 lines
1.7 KiB
Nix

/* Some functions for manipulating meta attributes, as well as the
name attribute. */
let lib = import ./default.nix;
in
rec {
/* Add to or override the meta attributes of the given
derivation.
Example:
addMetaAttrs {description = "Bla blah";} somePkg
*/
addMetaAttrs = newAttrs: drv:
drv // { meta = (drv.meta or {}) // newAttrs; };
/* Change the symbolic name of a package for presentation purposes
(i.e., so that nix-env users can tell them apart).
*/
setName = name: drv: drv // {inherit name;};
/* Like `setName', but takes the previous name as an argument.
Example:
updateName (oldName: oldName + "-experimental") somePkg
*/
updateName = updater: drv: drv // {name = updater (drv.name);};
/* Append a suffix to the name of a package. !!! the suffix should
really be appended *before* the version, at least most of the
time.
*/
appendToName = suffix: updateName (name: "${name}-${suffix}");
/* Apply a function to each derivation and only to derivations in an attrset
*/
mapDerivationAttrset = f: set: lib.mapAttrs (name: pkg: if lib.isDerivation pkg then (f pkg) else pkg) set;
/* Decrease the nix-env priority of the package, i.e., other
versions/variants of the package will be preferred.
*/
lowPrio = drv: addMetaAttrs { priority = "10"; } drv;
/* Apply lowPrio to an attrset with derivations
*/
lowPrioSet = set: mapDerivationAttrset lowPrio set;
/* Increase the nix-env priority of the package, i.e., this
version/variant of the package will be preferred.
*/
hiPrio = drv: addMetaAttrs { priority = "-10"; } drv;
/* Apply hiPrio to an attrset with derivations
*/
hiPrioSet = set: mapDerivationAttrset hiPrio set;
}