304 lines
12 KiB
Nix
304 lines
12 KiB
Nix
# Checks derivation meta and attrs for problems (like brokenness,
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# licenses, etc).
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{ lib, config, hostPlatform }:
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let
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# If we're in hydra, we can dispense with the more verbose error
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# messages and make problems easier to spot.
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inHydra = config.inHydra or false;
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getName = attrs: attrs.name or ("${attrs.pname or "«name-missing»"}-${attrs.version or "«version-missing»"}");
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# See discussion at https://github.com/NixOS/nixpkgs/pull/25304#issuecomment-298385426
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# for why this defaults to false, but I (@copumpkin) want to default it to true soon.
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shouldCheckMeta = config.checkMeta or false;
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allowUnfree = config.allowUnfree or false
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|| builtins.getEnv "NIXPKGS_ALLOW_UNFREE" == "1";
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allowlist = config.allowlistedLicenses or config.whitelistedLicenses or [];
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blocklist = config.blocklistedLicenses or config.blacklistedLicenses or [];
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areLicenseListsValid =
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if lib.mutuallyExclusive allowlist blocklist then
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true
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else
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throw "allowlistedLicenses and blocklistedLicenses are not mutually exclusive.";
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hasLicense = attrs:
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attrs ? meta.license;
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hasAllowlistedLicense = assert areLicenseListsValid; attrs:
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hasLicense attrs && lib.lists.any (l: builtins.elem l allowlist) (lib.lists.toList attrs.meta.license);
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hasBlocklistedLicense = assert areLicenseListsValid; attrs:
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hasLicense attrs && lib.lists.any (l: builtins.elem l blocklist) (lib.lists.toList attrs.meta.license);
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allowBroken = config.allowBroken or false
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|| builtins.getEnv "NIXPKGS_ALLOW_BROKEN" == "1";
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allowUnsupportedSystem = config.allowUnsupportedSystem or false
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|| builtins.getEnv "NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM" == "1";
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isUnfree = licenses: lib.lists.any (l: !l.free or true) licenses;
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hasUnfreeLicense = attrs:
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hasLicense attrs &&
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isUnfree (lib.lists.toList attrs.meta.license);
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isMarkedBroken = attrs: attrs.meta.broken or false;
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hasUnsupportedPlatform = attrs:
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(!lib.lists.elem hostPlatform.system (attrs.meta.platforms or lib.platforms.all) ||
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lib.lists.elem hostPlatform.system (attrs.meta.badPlatforms or []));
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isMarkedInsecure = attrs: (attrs.meta.knownVulnerabilities or []) != [];
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# Alow granular checks to allow only some unfree packages
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# Example:
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# {pkgs, ...}:
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# {
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# allowUnfree = false;
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# allowUnfreePredicate = (x: pkgs.lib.hasPrefix "vscode" x.name);
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# }
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allowUnfreePredicate = config.allowUnfreePredicate or (x: false);
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# Check whether unfree packages are allowed and if not, whether the
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# package has an unfree license and is not explicitely allowed by the
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# `allowUnfreePredicate` function.
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hasDeniedUnfreeLicense = attrs:
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hasUnfreeLicense attrs &&
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!allowUnfree &&
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!allowUnfreePredicate attrs;
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allowInsecureDefaultPredicate = x: builtins.elem (getName x) (config.permittedInsecurePackages or []);
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allowInsecurePredicate = x: (config.allowInsecurePredicate or allowInsecureDefaultPredicate) x;
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hasAllowedInsecure = attrs:
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!(isMarkedInsecure attrs) ||
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allowInsecurePredicate attrs ||
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builtins.getEnv "NIXPKGS_ALLOW_INSECURE" == "1";
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showLicense = license: toString (map (l: l.shortName or "unknown") (lib.lists.toList license));
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pos_str = meta: meta.position or "«unknown-file»";
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remediation = {
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unfree = remediate_allowlist "Unfree" remediate_unfree_predicate;
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broken = remediate_allowlist "Broken" (x: "");
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unsupported = remediate_allowlist "UnsupportedSystem" (x: "");
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blocklisted = x: "";
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insecure = remediate_insecure;
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broken-outputs = remediateOutputsToInstall;
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unknown-meta = x: "";
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};
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remediation_env_var = allow_attr: {
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Unfree = "NIXPKGS_ALLOW_UNFREE";
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Broken = "NIXPKGS_ALLOW_BROKEN";
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UnsupportedSystem = "NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM";
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}.${allow_attr};
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remediation_phrase = allow_attr: {
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Unfree = "unfree packages";
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Broken = "broken packages";
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UnsupportedSystem = "packages that are unsupported for this system";
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}.${allow_attr};
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remediate_unfree_predicate = attrs:
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''
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Alternatively you can configure a predicate to allow specific packages:
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{ nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [
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"${lib.getName attrs}"
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];
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}
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'';
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# flakeNote will be printed in the remediation messages below.
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flakeNote = "
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Note: For `nix shell`, `nix build`, `nix develop` or any other Nix 2.4+
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(Flake) command, `--impure` must be passed in order to read this
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environment variable.
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";
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remediate_allowlist = allow_attr: rebuild_amendment: attrs:
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''
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a) To temporarily allow ${remediation_phrase allow_attr}, you can use an environment variable
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for a single invocation of the nix tools.
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$ export ${remediation_env_var allow_attr}=1
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${flakeNote}
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b) For `nixos-rebuild` you can set
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{ nixpkgs.config.allow${allow_attr} = true; }
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in configuration.nix to override this.
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${rebuild_amendment attrs}
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c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
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{ allow${allow_attr} = true; }
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to ~/.config/nixpkgs/config.nix.
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'';
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remediate_insecure = attrs:
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''
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Known issues:
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'' + (lib.concatStrings (map (issue: " - ${issue}\n") attrs.meta.knownVulnerabilities)) + ''
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You can install it anyway by allowing this package, using the
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following methods:
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a) To temporarily allow all insecure packages, you can use an environment
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variable for a single invocation of the nix tools:
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$ export NIXPKGS_ALLOW_INSECURE=1
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${flakeNote}
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b) for `nixos-rebuild` you can add ‘${getName attrs}’ to
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`nixpkgs.config.permittedInsecurePackages` in the configuration.nix,
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like so:
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{
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nixpkgs.config.permittedInsecurePackages = [
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"${getName attrs}"
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];
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}
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c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
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‘${getName attrs}’ to `permittedInsecurePackages` in
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~/.config/nixpkgs/config.nix, like so:
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{
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permittedInsecurePackages = [
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"${getName attrs}"
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];
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}
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'';
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remediateOutputsToInstall = attrs: let
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expectedOutputs = attrs.meta.outputsToInstall or [];
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actualOutputs = attrs.outputs or [ "out" ];
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missingOutputs = builtins.filter (output: ! builtins.elem output actualOutputs) expectedOutputs;
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in ''
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The package ${getName attrs} has set meta.outputsToInstall to: ${builtins.concatStringsSep ", " expectedOutputs}
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however ${getName attrs} only has the outputs: ${builtins.concatStringsSep ", " actualOutputs}
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and is missing the following ouputs:
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${lib.concatStrings (builtins.map (output: " - ${output}\n") missingOutputs)}
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'';
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handleEvalIssue = { meta, attrs }: { reason , errormsg ? "" }:
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let
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msg = if inHydra
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then "Failed to evaluate ${getName attrs}: «${reason}»: ${errormsg}"
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else ''
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Package ‘${getName attrs}’ in ${pos_str meta} ${errormsg}, refusing to evaluate.
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'' + (builtins.getAttr reason remediation) attrs;
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handler = if config ? handleEvalIssue
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then config.handleEvalIssue reason
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else throw;
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in handler msg;
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metaTypes = with lib.types; rec {
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# These keys are documented
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description = str;
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mainProgram = str;
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longDescription = str;
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branch = str;
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homepage = either (listOf str) str;
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downloadPage = str;
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changelog = either (listOf str) str;
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license = either (listOf lib.types.attrs) (either lib.types.attrs str);
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maintainers = listOf (attrsOf str);
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priority = int;
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platforms = listOf str;
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hydraPlatforms = listOf str;
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broken = bool;
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unfree = bool;
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unsupported = bool;
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insecure = bool;
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# TODO: refactor once something like Profpatsch's types-simple will land
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# This is currently dead code due to https://github.com/NixOS/nix/issues/2532
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tests = attrsOf (mkOptionType {
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name = "test";
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check = x: x == {} || ( # Accept {} for tests that are unsupported
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isDerivation x &&
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x ? meta.timeout
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);
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merge = lib.options.mergeOneOption;
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});
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timeout = int;
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# Weirder stuff that doesn't appear in the documentation?
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maxSilent = int;
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knownVulnerabilities = listOf str;
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name = str;
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version = str;
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tag = str;
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executables = listOf str;
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outputsToInstall = listOf str;
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position = str;
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available = bool;
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isBuildPythonPackage = platforms;
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schedulingPriority = int;
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isFcitxEngine = bool;
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isIbusEngine = bool;
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isGutenprint = bool;
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badPlatforms = platforms;
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};
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checkMetaAttr = k: v:
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if metaTypes?${k} then
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if metaTypes.${k}.check v then null else "key '${k}' has a value ${toString v} of an invalid type ${builtins.typeOf v}; expected ${metaTypes.${k}.description}"
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else "key '${k}' is unrecognized; expected one of: \n\t [${lib.concatMapStringsSep ", " (x: "'${x}'") (lib.attrNames metaTypes)}]";
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checkMeta = meta: if shouldCheckMeta then lib.remove null (lib.mapAttrsToList checkMetaAttr meta) else [];
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checkOutputsToInstall = attrs: let
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expectedOutputs = attrs.meta.outputsToInstall or [];
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actualOutputs = attrs.outputs or [ "out" ];
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missingOutputs = builtins.filter (output: ! builtins.elem output actualOutputs) expectedOutputs;
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in if shouldCheckMeta
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then builtins.length missingOutputs > 0
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else false;
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# Check if a derivation is valid, that is whether it passes checks for
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# e.g brokenness or license.
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#
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# Return { valid: Bool } and additionally
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# { reason: String; errormsg: String } if it is not valid, where
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# reason is one of "unfree", "blocklisted", "broken", "insecure", ...
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# Along with a boolean flag for each reason
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checkValidity = attrs:
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{
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unfree = hasUnfreeLicense attrs;
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broken = isMarkedBroken attrs;
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unsupported = hasUnsupportedPlatform attrs;
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insecure = isMarkedInsecure attrs;
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}
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// (if hasDeniedUnfreeLicense attrs && !(hasAllowlistedLicense attrs) then
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{ valid = false; reason = "unfree"; errormsg = "has an unfree license (‘${showLicense attrs.meta.license}’)"; }
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else if hasBlocklistedLicense attrs then
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{ valid = false; reason = "blocklisted"; errormsg = "has a blocklisted license (‘${showLicense attrs.meta.license}’)"; }
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else if !allowBroken && attrs.meta.broken or false then
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{ valid = false; reason = "broken"; errormsg = "is marked as broken"; }
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else if !allowUnsupportedSystem && hasUnsupportedPlatform attrs then
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{ valid = false; reason = "unsupported"; errormsg = "is not supported on ‘${hostPlatform.system}’"; }
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else if !(hasAllowedInsecure attrs) then
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{ valid = false; reason = "insecure"; errormsg = "is marked as insecure"; }
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else if checkOutputsToInstall attrs then
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{ valid = false; reason = "broken-outputs"; errormsg = "has invalid meta.outputsToInstall"; }
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else let res = checkMeta (attrs.meta or {}); in if res != [] then
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{ valid = false; reason = "unknown-meta"; errormsg = "has an invalid meta attrset:${lib.concatMapStrings (x: "\n\t - " + x) res}"; }
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else { valid = true; });
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assertValidity = { meta, attrs }: let
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validity = checkValidity attrs;
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in validity // {
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# Throw an error if trying to evaluate an non-valid derivation
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handled = if !validity.valid
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then handleEvalIssue { inherit meta attrs; } { inherit (validity) reason errormsg; }
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else true;
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};
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in assertValidity
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