512 lines
19 KiB
Nix
512 lines
19 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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inherit (lib)
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all
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attrNames
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concatMapStrings
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concatMapStringsSep
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concatStrings
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findFirst
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isDerivation
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length
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mapAttrsToList
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mergeDefinitions
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mutuallyExclusive
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optional
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optionalAttrs
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optionalString
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optionals
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remove
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unknownModule
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isAttrs
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isString
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;
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inherit (lib.lists)
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any
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toList
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isList
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elem
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;
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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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# Allow the user to opt-into additional warnings, e.g.
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# import <nixpkgs> { config = { showDerivationWarnings = [ "maintainerless" ]; }; }
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showWarnings = config.showDerivationWarnings;
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getName = attrs: attrs.name or ("${attrs.pname or "«name-missing»"}-${attrs.version or "«version-missing»"}");
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allowUnfree = config.allowUnfree
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|| builtins.getEnv "NIXPKGS_ALLOW_UNFREE" == "1";
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allowNonSource = let
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envVar = builtins.getEnv "NIXPKGS_ALLOW_NONSOURCE";
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in if envVar != ""
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then envVar != "0"
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else config.allowNonSource or true;
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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 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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hasListedLicense = assert areLicenseListsValid; list: attrs:
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length list > 0 && hasLicense attrs && (
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if isList attrs.meta.license then any (l: elem l list) attrs.meta.license
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else elem attrs.meta.license list
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);
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hasAllowlistedLicense = attrs: hasListedLicense allowlist attrs;
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hasBlocklistedLicense = attrs: hasListedLicense blocklist attrs;
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allowBroken = config.allowBroken
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|| builtins.getEnv "NIXPKGS_ALLOW_BROKEN" == "1";
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allowUnsupportedSystem = config.allowUnsupportedSystem
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|| builtins.getEnv "NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM" == "1";
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isUnfree = licenses:
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if isAttrs licenses then !licenses.free or true
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# TODO: Returning false in the case of a string is a bug that should be fixed.
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# In a previous implementation of this function the function body
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# was `licenses: lib.lists.any (l: !l.free or true) licenses;`
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# which always evaluates to `!true` for strings.
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else if isString licenses then false
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else lib.lists.any (l: !l.free or true) licenses;
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hasUnfreeLicense = attrs: hasLicense attrs && isUnfree attrs.meta.license;
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hasNoMaintainers = attrs:
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attrs ? meta.maintainers && (length attrs.meta.maintainers) == 0;
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isMarkedBroken = attrs: attrs.meta.broken or false;
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hasUnsupportedPlatform =
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pkg: !(lib.meta.availableOn hostPlatform pkg);
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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 explicitly 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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isNonSource = sourceTypes: any (t: !t.isSource) sourceTypes;
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hasNonSourceProvenance = attrs:
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(attrs ? meta.sourceProvenance) &&
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isNonSource attrs.meta.sourceProvenance;
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# Allow granular checks to allow only some non-source-built packages
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# Example:
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# { pkgs, ... }:
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# {
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# allowNonSource = false;
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# allowNonSourcePredicate = with pkgs.lib.lists; pkg: !(any (p: !p.isSource && p != lib.sourceTypes.binaryFirmware) pkg.meta.sourceProvenance);
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# }
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allowNonSourcePredicate = config.allowNonSourcePredicate or (x: false);
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# Check whether non-source packages are allowed and if not, whether the
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# package has non-source provenance and is not explicitly allowed by the
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# `allowNonSourcePredicate` function.
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hasDeniedNonSourceProvenance = attrs:
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hasNonSourceProvenance attrs &&
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!allowNonSource &&
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!allowNonSourcePredicate attrs;
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showLicenseOrSourceType = value: toString (map (v: v.shortName or "unknown") (toList value));
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showLicense = showLicenseOrSourceType;
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showSourceType = showLicenseOrSourceType;
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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_predicate "allowUnfreePredicate");
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non-source = remediate_allowlist "NonSource" (remediate_predicate "allowNonSourcePredicate");
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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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maintainerless = 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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NonSource = "NIXPKGS_ALLOW_NONSOURCE";
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}.${allow_attr};
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remediation_phrase = allow_attr: {
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Unfree = "unfree packages";
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Broken = "broken packages";
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UnsupportedSystem = "packages that are unsupported for this system";
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NonSource = "packages not built from source";
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}.${allow_attr};
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remediate_predicate = predicateConfigAttr: 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.${predicateConfigAttr} = pkg: builtins.elem (lib.getName pkg) [
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"${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: When using `nix shell`, `nix build`, `nix develop`, etc with a flake,
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then pass `--impure` in order to allow use of environment variables.
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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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'' + (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: ${builtins.concatStringsSep ", " actualOutputs}
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and is missing the following ouputs:
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${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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handleEvalWarning = { meta, attrs }: { reason , errormsg ? "" }:
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let
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remediationMsg = (builtins.getAttr reason remediation) attrs;
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msg = if inHydra then "Warning while evaluating ${getName attrs}: «${reason}»: ${errormsg}"
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else "Package ${getName attrs} in ${pos_str meta} ${errormsg}, continuing anyway."
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+ (optionalString (remediationMsg != "") "\n${remediationMsg}");
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isEnabled = findFirst (x: x == reason) null showWarnings;
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in if isEnabled != null then builtins.trace msg true else true;
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# Deep type-checking. Note that calling `type.check` is not enough: see `lib.mkOptionType`'s documentation.
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# We don't include this in lib for now because this function is flawed: it accepts things like `mkIf true 42`.
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typeCheck = type: value: let
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merged = mergeDefinitions [ ] type [
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{ file = unknownModule; inherit value; }
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];
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eval = builtins.tryEval (builtins.deepSeq merged.mergedValue null);
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in eval.success;
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# TODO make this into a proper module and use the generic option documentation generation?
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metaTypes = let
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inherit (lib.types)
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anything
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attrsOf
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bool
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either
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int
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listOf
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mkOptionType
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str
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unspecified
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;
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platforms = listOf (either str (attrsOf anything)); # see lib.meta.platformMatch
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in {
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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 = let
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licenseType = either (attrsOf anything) str; # TODO disallow `str` licenses, use a module
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in either licenseType (listOf licenseType);
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sourceProvenance = listOf lib.types.attrs;
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maintainers = listOf (attrsOf anything); # TODO use the maintainer type from lib/tests/maintainer-module.nix
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priority = int;
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pkgConfigModules = listOf str;
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inherit platforms;
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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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# Needed for Hydra to expose channel tarballs:
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# https://github.com/NixOS/hydra/blob/53335323ae79ca1a42643f58e520b376898ce641/doc/manual/src/jobs.md#meta-fields
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isHydraChannel = bool;
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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 = unspecified;
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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?${k} then
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if typeCheck metaTypes.${k} v then
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null
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else
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"key 'meta.${k}' has invalid value; expected ${metaTypes.${k}.description}, got\n ${
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lib.generators.toPretty { indent = " "; } v
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}"
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else
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"key 'meta.${k}' is unrecognized; expected one of: \n [${concatMapStringsSep ", " (x: "'${x}'") (attrNames metaTypes)}]";
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checkMeta = meta: optionals config.checkMeta (remove null (mapAttrsToList checkMetaAttr meta));
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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 config.checkMeta
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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: "yes", "warn" or "no" } 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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# !!! reason strings are hardcoded into OfBorg, make sure to keep them in sync
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# Along with a boolean flag for each reason
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checkValidity = attrs:
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# Check meta attribute types first, to make sure it is always called even when there are other issues
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# Note that this is not a full type check and functions below still need to by careful about their inputs!
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let res = checkMeta (attrs.meta or {}); in if res != [] then
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{ valid = "no"; reason = "unknown-meta"; errormsg = "has an invalid meta attrset:${concatMapStrings (x: "\n - " + x) res}\n";
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unfree = false; nonSource = false; broken = false; unsupported = false; insecure = false;
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}
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else {
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unfree = hasUnfreeLicense attrs;
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nonSource = hasNonSourceProvenance attrs;
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broken = isMarkedBroken attrs;
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unsupported = hasUnsupportedPlatform attrs;
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insecure = isMarkedInsecure attrs;
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} // (
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# --- Put checks that cannot be ignored here ---
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if checkOutputsToInstall attrs then
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{ valid = "no"; reason = "broken-outputs"; errormsg = "has invalid meta.outputsToInstall"; }
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# --- Put checks that can be ignored here ---
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else if hasDeniedUnfreeLicense attrs && !(hasAllowlistedLicense attrs) then
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{ valid = "no"; reason = "unfree"; errormsg = "has an unfree license (‘${showLicense attrs.meta.license}’)"; }
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else if hasBlocklistedLicense attrs then
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{ valid = "no"; reason = "blocklisted"; errormsg = "has a blocklisted license (‘${showLicense attrs.meta.license}’)"; }
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else if hasDeniedNonSourceProvenance attrs then
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{ valid = "no"; reason = "non-source"; errormsg = "contains elements not built from source (‘${showSourceType attrs.meta.sourceProvenance}’)"; }
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else if !allowBroken && attrs.meta.broken or false then
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{ valid = "no"; reason = "broken"; errormsg = "is marked as broken"; }
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else if !allowUnsupportedSystem && hasUnsupportedPlatform attrs then
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let toPretty = lib.generators.toPretty {
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allowPrettyValues = true;
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indent = " ";
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};
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in { valid = "no"; reason = "unsupported";
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errormsg = ''
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is not available on the requested hostPlatform:
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hostPlatform.config = "${hostPlatform.config}"
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package.meta.platforms = ${toPretty (attrs.meta.platforms or [])}
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package.meta.badPlatforms = ${toPretty (attrs.meta.badPlatforms or [])}
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'';
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}
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else if !(hasAllowedInsecure attrs) then
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{ valid = "no"; reason = "insecure"; errormsg = "is marked as insecure"; }
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# --- warnings ---
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# Please also update the type in /pkgs/top-level/config.nix alongside this.
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else if hasNoMaintainers attrs then
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{ valid = "warn"; reason = "maintainerless"; errormsg = "has no maintainers"; }
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# -----
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else { valid = "yes"; });
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# The meta attribute is passed in the resulting attribute set,
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# but it's not part of the actual derivation, i.e., it's not
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# passed to the builder and is not a dependency. But since we
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# include it in the result, it *is* available to nix-env for queries.
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# Example:
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# meta = checkMeta.commonMeta { inherit validity attrs pos references; };
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# validity = checkMeta.assertValidity { inherit meta attrs; };
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commonMeta = { validity, attrs, pos ? null, references ? [ ] }:
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let
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outputs = attrs.outputs or [ "out" ];
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in
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{
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# `name` derivation attribute includes cross-compilation cruft,
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# is under assert, and is sanitized.
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# Let's have a clean always accessible version here.
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name = attrs.name or "${attrs.pname}-${attrs.version}";
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# If the packager hasn't specified `outputsToInstall`, choose a default,
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# which is the name of `p.bin or p.out or p` along with `p.man` when
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# present.
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#
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# If the packager has specified it, it will be overridden below in
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# `// meta`.
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#
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# Note: This default probably shouldn't be globally configurable.
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# Services and users should specify outputs explicitly,
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# unless they are comfortable with this default.
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outputsToInstall =
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let
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hasOutput = out: builtins.elem out outputs;
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in
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[ (findFirst hasOutput null ([ "bin" "out" ] ++ outputs)) ]
|
||
++ optional (hasOutput "man") "man";
|
||
}
|
||
// attrs.meta or { }
|
||
# Fill `meta.position` to identify the source location of the package.
|
||
// optionalAttrs (pos != null) {
|
||
position = pos.file + ":" + toString pos.line;
|
||
} // {
|
||
# Expose the result of the checks for everyone to see.
|
||
inherit (validity) unfree broken unsupported insecure;
|
||
|
||
available = validity.valid != "no"
|
||
&& (if config.checkMetaRecursively or false
|
||
then all (d: d.meta.available or true) references
|
||
else true);
|
||
};
|
||
|
||
assertValidity = { meta, attrs }: let
|
||
validity = checkValidity attrs;
|
||
inherit (validity) valid;
|
||
in validity // {
|
||
# Throw an error if trying to evaluate a non-valid derivation
|
||
# or, alternatively, just output a warning message.
|
||
handled =
|
||
(
|
||
if valid == "yes" then true
|
||
else if valid == "no" then (
|
||
handleEvalIssue { inherit meta attrs; } { inherit (validity) reason errormsg; }
|
||
)
|
||
else if valid == "warn" then (
|
||
handleEvalWarning { inherit meta attrs; } { inherit (validity) reason errormsg; }
|
||
)
|
||
else throw "Unknown validitiy: '${valid}'"
|
||
);
|
||
};
|
||
|
||
in { inherit assertValidity commonMeta; }
|