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nixpkgs/lib/kernel.nix

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lib.kernel: make public Remove the "version" parameter in order to make it more widely available. Starts making some kernel configuration helpers available. The intent is to be able to better build and check the linux kernel configuration.
2019-09-18 09:34:02 +01:00
{ lib }:
linux: translate config to structured config Instead of using a string to describe kernel config, use a nix attribute set, then converted to a string. - allows to override the config, aka convert 'yes' into 'modules' or vice-versa - while for now merging different configs is still crude (last spec wins), at least there should be only one CONFIG_XYZ value compared to the current string config where the first defined would be used and others ignored. [initial idea by copumpkin in 2016, a major rebase to 2018 by teto]
2016-01-05 14:22:43 +00:00
with lib;
treewide: remove redundant rec
2019-08-13 22:52:01 +01:00
{
linux: translate config to structured config Instead of using a string to describe kernel config, use a nix attribute set, then converted to a string. - allows to override the config, aka convert 'yes' into 'modules' or vice-versa - while for now merging different configs is still crude (last spec wins), at least there should be only one CONFIG_XYZ value compared to the current string config where the first defined would be used and others ignored. [initial idea by copumpkin in 2016, a major rebase to 2018 by teto]
2016-01-05 14:22:43 +00:00
linux: ability to merge structured configs This should make the composability of kernel configurations more straigthforward. - now distinguish freeform options from tristate ones - will look for a structured config in kernelPatches too one can now access the structuredConfig from a kernel via linux_test.configfile.structuredConfig in order to reinject it into another kernel, no need to rewrite the config from scratch The following merge strategies are used in case of conflict: -- freeform items must be equal or they conflict (mergeEqualOption) -- for tristate (y/m/n) entries, I use the mergeAnswer strategy which takes the best available value, "best" being defined by the user (by default "y" > "m" > "n", e.g. if one entry is both marked "y" and "n", "y" wins) -- if one item is both marked optional/mandatory, mandatory wins (mergeFalseByDefault)
2018-10-03 10:49:50 +01:00
# Keeping these around in case we decide to change this horrible implementation :)
option = x:
x // { optional = true; };
linux: translate config to structured config Instead of using a string to describe kernel config, use a nix attribute set, then converted to a string. - allows to override the config, aka convert 'yes' into 'modules' or vice-versa - while for now merging different configs is still crude (last spec wins), at least there should be only one CONFIG_XYZ value compared to the current string config where the first defined would be used and others ignored. [initial idea by copumpkin in 2016, a major rebase to 2018 by teto]
2016-01-05 14:22:43 +00:00
lib.kernel.unset: init Previously, there was no way to unset an option when overriding a kernel, apart from writing out the attrset yourself. Now it's possible with lib.mkForce lib.kernel.unset. It's important to be able to do this, because setting an option in the override may cause other options to become unused, which would fail the config build unless they were overridden too.
2023-04-29 19:33:07 +01:00
yes = { tristate = "y"; optional = false; };
no = { tristate = "n"; optional = false; };
module = { tristate = "m"; optional = false; };
unset = { tristate = null; optional = false; };
kernel: fix config generation Addresses https://github.com/NixOS/nixpkgs/issues/71803: Kernel options are not merged as described, especially the "optional" aspects. The error silences legitimate warnings.
2020-04-01 02:20:33 +01:00
freeform = x: { freeform = x; optional = false; };
linux: translate config to structured config Instead of using a string to describe kernel config, use a nix attribute set, then converted to a string. - allows to override the config, aka convert 'yes' into 'modules' or vice-versa - while for now merging different configs is still crude (last spec wins), at least there should be only one CONFIG_XYZ value compared to the current string config where the first defined would be used and others ignored. [initial idea by copumpkin in 2016, a major rebase to 2018 by teto]
2016-01-05 14:22:43 +00:00
lib.kernel: scoped whenXXX helpers whenAtLeast/whenBetween are made available in lib/kernel.nix but are now scoped under whenXXX.
2019-09-19 12:12:35 +01:00
/*
linux/hardened: move files into directory
2020-04-26 18:19:02 +01:00
Common patterns/legacy used in common-config/hardened/config.nix
lib.kernel: scoped whenXXX helpers whenAtLeast/whenBetween are made available in lib/kernel.nix but are now scoped under whenXXX.
2019-09-19 12:12:35 +01:00
*/
whenHelpers = version: {
whenAtLeast = ver: mkIf (versionAtLeast version ver);
whenOlder = ver: mkIf (versionOlder version ver);
# range is (inclusive, exclusive)
whenBetween = verLow: verHigh: mkIf (versionAtLeast version verLow && versionOlder version verHigh);
};
linux: translate config to structured config Instead of using a string to describe kernel config, use a nix attribute set, then converted to a string. - allows to override the config, aka convert 'yes' into 'modules' or vice-versa - while for now merging different configs is still crude (last spec wins), at least there should be only one CONFIG_XYZ value compared to the current string config where the first defined would be used and others ignored. [initial idea by copumpkin in 2016, a major rebase to 2018 by teto]
2016-01-05 14:22:43 +00:00
}
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