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Merge pull request #269637 from adisbladis/lib-meta-avoid-alloc-platformmatch

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lib.meta: Avoid attrset allocation in platformMatch
This commit is contained in:
Silvan Mosberger 2023-11-26 23:28:39 +01:00 committed by GitHub
commit 627af21e87
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2 changed files with 42 additions and 10 deletions
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32
lib/meta.nix
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@ -3,6 +3,11 @@
{ lib }:
let
inherit (lib) matchAttrs any all;
inherit (builtins) isString;
in
rec {
@ -83,14 +88,21 @@ rec {
We can inject these into a pattern for the whole of a structured platform,
and then match that.
*/
platformMatch = platform: elem: let
pattern =
if builtins.isString elem
then { system = elem; }
else if elem?parsed
then elem
else { parsed = elem; };
in lib.matchAttrs pattern platform;
platformMatch = platform: elem: (
# Check with simple string comparison if elem was a string.
#
# The majority of comparisons done with this function will be against meta.platforms
# which contains a simple platform string.
#
# Avoiding an attrset allocation results in significant performance gains (~2-30) across the board in OfBorg
# because this is a hot path for nixpkgs.
if isString elem then platform ? system && elem == platform.system
else matchAttrs (
# Normalize platform attrset.
if elem ? parsed then elem
else { parsed = elem; }
) platform
);
/* Check if a package is available on a given platform.
@ -102,8 +114,8 @@ rec {
2. None of `meta.badPlatforms` pattern matches the given platform.
*/
availableOn = platform: pkg:
((!pkg?meta.platforms) || lib.any (platformMatch platform) pkg.meta.platforms) &&
lib.all (elem: !platformMatch platform elem) (pkg.meta.badPlatforms or []);
((!pkg?meta.platforms) || any (platformMatch platform) pkg.meta.platforms) &&
all (elem: !platformMatch platform elem) (pkg.meta.badPlatforms or []);
/* Get the corresponding attribute in lib.licenses
from the SPDX ID.

20
lib/tests/misc.nix
View file

@ -1948,4 +1948,24 @@ runTests {
testGetExe'FailureSecondArg = testingThrow (
getExe' { type = "derivation"; } "dir/executable"
);
testPlatformMatch = {
expr = meta.platformMatch { system = "x86_64-linux"; } "x86_64-linux";
expected = true;
};
testPlatformMatchAttrs = {
expr = meta.platformMatch (systems.elaborate "x86_64-linux") (systems.elaborate "x86_64-linux").parsed;
expected = true;
};
testPlatformMatchNoMatch = {
expr = meta.platformMatch { system = "x86_64-darwin"; } "x86_64-linux";
expected = false;
};
testPlatformMatchMissingSystem = {
expr = meta.platformMatch { } "x86_64-linux";
expected = false;
};
}