lib.meta.licensesSpdx: mapping from SPDX ID to compatible licenses

lib/default.nix

@@ -123,7 +123,8 @@ let
  inherit (self.derivations) lazyDerivation optionalDrvAttr;
  inherit (self.meta) addMetaAttrs dontDistribute setName updateName
  appendToName mapDerivationAttrset setPrio lowPrio lowPrioSet hiPrio
- hiPrioSet getLicenseFromSpdxId getLicenseFromSpdxIdOr getExe getExe';
+ hiPrioSet licensesSpdx getLicenseFromSpdxId getLicenseFromSpdxIdOr
+ getExe getExe';
  inherit (self.filesystem) pathType pathIsDirectory pathIsRegularFile
  packagesFromDirectoryRecursive;
  inherit (self.sources) cleanSourceFilter

lib/meta.nix

@@ -7,6 +7,7 @@
 
 let
  inherit (lib) matchAttrs any all isDerivation getBin assertMsg;
+ inherit (lib.attrsets) mapAttrs' filterAttrs;
  inherit (builtins) isString match typeOf;
 
 in
@@ -286,11 +287,39 @@ rec {
  ((!pkg?meta.platforms) || any (platformMatch platform) pkg.meta.platforms) &&
  all (elem: !platformMatch platform elem) (pkg.meta.badPlatforms or []);
 
+ /**
+ Mapping of SPDX ID to the attributes in lib.licenses.
+
+ For SPDX IDs, see https://spdx.org/licenses.
+ Note that some SPDX licenses might be missing.
+
+ # Examples
+ :::{.example}
+ ## `lib.meta.licensesSpdx` usage example
+
+ ```nix
+ lib.licensesSpdx.MIT == lib.licenses.mit
+ => true
+ lib.licensesSpdx."MY LICENSE"
+ => error: attribute 'MY LICENSE' missing
+ ```
+
+ :::
+ */
+ licensesSpdx =
+ mapAttrs'
+ (_key: license: {
+ name = license.spdxId;
+ value = license;
+ })
+ (filterAttrs (_key: license: license ? spdxId) lib.licenses);
+
  /**
  Get the corresponding attribute in lib.licenses from the SPDX ID
  or warn and fallback to `{ shortName = <license string>; }`.
 
- For SPDX IDs, see https://spdx.org/licenses
+ For SPDX IDs, see https://spdx.org/licenses.
+ Note that some SPDX licenses might be missing.
 
  # Type
 
@@ -325,7 +354,8 @@ rec {
  Get the corresponding attribute in lib.licenses from the SPDX ID
  or fallback to the given default value.
 
- For SPDX IDs, see https://spdx.org/licenses
+ For SPDX IDs, see https://spdx.org/licenses.
+ Note that some SPDX licenses might be missing.
 
  # Inputs
 
@@ -361,10 +391,12 @@ rec {
  */
  getLicenseFromSpdxIdOr =
  let
- spdxLicenses = lib.mapAttrs (id: ls: assert lib.length ls == 1; builtins.head ls)
- (lib.groupBy (l: lib.toLower l.spdxId) (lib.filter (l: l ? spdxId) (lib.attrValues lib.licenses)));
+ lowercaseLicenses = lib.mapAttrs' (name: value: {
+ name = lib.toLower name;
+ inherit value;
+ }) licensesSpdx;
  in licstr: default:
- spdxLicenses.${ lib.toLower licstr } or default;
+ lowercaseLicenses.${ lib.toLower licstr } or default;
 
  /**
  Get the path to the main program of a package based on meta.mainProgram