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103 lines
2.8 KiB
Nix
103 lines
2.8 KiB
Nix
/* Some functions for manipulating meta attributes, as well as the
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name attribute. */
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{ lib }:
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rec {
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/* Add to or override the meta attributes of the given
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derivation.
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Example:
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addMetaAttrs {description = "Bla blah";} somePkg
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*/
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addMetaAttrs = newAttrs: drv:
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drv // { meta = (drv.meta or {}) // newAttrs; };
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/* Disable Hydra builds of given derivation.
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*/
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dontDistribute = drv: addMetaAttrs { hydraPlatforms = []; } drv;
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/* Change the symbolic name of a package for presentation purposes
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(i.e., so that nix-env users can tell them apart).
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*/
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setName = name: drv: drv // {inherit name;};
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/* Like `setName', but takes the previous name as an argument.
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Example:
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updateName (oldName: oldName + "-experimental") somePkg
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*/
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updateName = updater: drv: drv // {name = updater (drv.name);};
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/* Append a suffix to the name of a package (before the version
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part). */
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appendToName = suffix: updateName (name:
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let x = builtins.parseDrvName name; in "${x.name}-${suffix}-${x.version}");
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/* Apply a function to each derivation and only to derivations in an attrset.
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*/
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mapDerivationAttrset = f: set: lib.mapAttrs (name: pkg: if lib.isDerivation pkg then (f pkg) else pkg) set;
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/* Set the nix-env priority of the package.
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*/
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setPrio = priority: addMetaAttrs { inherit priority; };
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/* Decrease the nix-env priority of the package, i.e., other
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versions/variants of the package will be preferred.
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*/
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lowPrio = setPrio 10;
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/* Apply lowPrio to an attrset with derivations
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*/
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lowPrioSet = set: mapDerivationAttrset lowPrio set;
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/* Increase the nix-env priority of the package, i.e., this
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version/variant of the package will be preferred.
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*/
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hiPrio = setPrio (-10);
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/* Apply hiPrio to an attrset with derivations
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*/
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hiPrioSet = set: mapDerivationAttrset hiPrio set;
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/* Check to see if a platform is matched by the given `meta.platforms`
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element.
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A `meta.platform` pattern is either
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1. (legacy) a system string.
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2. (modern) a pattern for the platform `parsed` field.
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We can inject these into a patten for the whole of a structured platform,
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and then match that.
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*/
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platformMatch = platform: elem: let
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pattern =
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if builtins.isString elem
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then { system = elem; }
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else { parsed = elem; };
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in lib.matchAttrs pattern platform;
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/* Check if a package is available on a given platform.
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A package is available on a platform if both
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1. One of `meta.platforms` pattern matches the given platform.
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2. None of `meta.badPlatforms` pattern matches the given platform.
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*/
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availableOn = platform: pkg:
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lib.any (platformMatch platform) pkg.meta.platforms &&
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lib.all (elem: !platformMatch platform elem) (pkg.meta.badPlatforms or []);
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}
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