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lib: Add optionalDrvAttr to conditionally set drv attributes.

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This allows for adding new, conditionally set, derivation attributes
to an existing derivation without changing any output paths in the
case where the condition is not met.
This commit is contained in:
Shea Levy 2024-01-30 17:29:47 -05:00
parent 5b5e6f9900
commit ca1262a483
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GPG key ID: 5C0BD6957D86FE27
4 changed files with 47 additions and 2 deletions
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20
lib/tests/misc.nix
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@ -1902,7 +1902,7 @@ runTests {
expected = true;
};
# lazyDerivation
# DERIVATIONS
testLazyDerivationIsLazyInDerivationForAttrNames = {
expr = attrNames (lazyDerivation {
@ -1955,6 +1955,24 @@ runTests {
expected = derivation;
};
testOptionalDrvAttr = let
mkDerivation = args: derivation (args // {
builder = "builder";
system = "system";
__ignoreNulls = true;
});
in {
expr = (mkDerivation {
name = "foo";
x = optionalDrvAttr true 1;
y = optionalDrvAttr false 1;
}).drvPath;
expected = (mkDerivation {
name = "foo";
x = 1;
}).drvPath;
};
testTypeDescriptionInt = {
expr = (with types; int).description;
expected = "signed integer";