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lib: add inPureEvalMode

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This makes a value that is true if builtins does not contain the
currentSystem function, but false if it does.
This commit is contained in:
matthewcroughan 2021-11-14 23:14:09 +00:00
parent 70b3cbff57
commit 4d9801a78f
2 changed files with 8 additions and 1 deletions
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2
lib/default.nix
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@ -74,7 +74,7 @@ let
info showWarnings nixpkgsVersion version isInOldestRelease
mod compare splitByAndCompare
functionArgs setFunctionArgs isFunction toFunction
toHexString toBaseDigits;
toHexString toBaseDigits inPureEvalMode;
inherit (self.fixedPoints) fix fix' converge extends composeExtensions
composeManyExtensions makeExtensible makeExtensibleWithCustomName;
inherit (self.attrsets) attrByPath hasAttrByPath setAttrByPath

7
lib/trivial.nix
View file

@ -229,6 +229,13 @@ rec {
*/
inNixShell = builtins.getEnv "IN_NIX_SHELL" != "";
/* Determine whether the function is being called from inside pure-eval mode
by seeing whether `builtins` contains `currentSystem`. If not, we must be in
pure-eval mode.
Type: inPureEvalMode :: bool
*/
inPureEvalMode = ! builtins ? currentSystem;
## Integer operations