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lib/systems: add doublesFromPattern #212187

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lib/systems: add doublesFromPattern #212187

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19 changes: 19 additions & 0 deletions lib/systems/default.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,25 @@ rec {
let removeFunctions = a: lib.filterAttrs (_: v: !builtins.isFunction v) a;
in a: b: removeFunctions a == removeFunctions b;

# This function returns the elements of `systems.doubles.all`
# which match its argument, which can be either a pattern (see
# `lib.systems.inspect.patterns`) or a nix-double string. It is
# used mainly for backward compatibility with existing code that
# expects `meta.{bad,hydra,""}platforms` to be a list of strings.
doublesFromPattern = pattern:
if lib.isString pattern
then [pattern]
else lib.filter
(double: lib.meta.platformMatch (elaborate double) pattern)
doubles.all;

# like above, but applied to a (disjunctive) list, with some
# optimizations for common cases on Hydra
doublesFromPatterns = patterns:
if lib.all lib.isString patterns
then patterns
else lib.concatMap doublesFromPattern patterns;

/* List of all Nix system doubles the nixpkgs flake will expose the package set
for. All systems listed here must be supported by nixpkgs as `localSystem`.

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