209 lines
7.7 KiB
Nix
209 lines
7.7 KiB
Nix
# Checks derivation meta and attrs for problems (like brokenness,
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# licenses, etc).
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{ lib, config, hostPlatform, meta }:
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let
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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 || builtins.getEnv "NIXPKGS_ALLOW_UNFREE" == "1";
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whitelist = config.whitelistedLicenses or [];
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blacklist = config.blacklistedLicenses or [];
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onlyLicenses = list:
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lib.lists.all (license:
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let l = lib.licenses.${license.shortName or "BROKEN"} or false; in
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if license == l then true else
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throw ''‘${showLicense license}’ is not an attribute of lib.licenses''
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) list;
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areLicenseListsValid =
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if lib.mutuallyExclusive whitelist blacklist then
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assert onlyLicenses whitelist; assert onlyLicenses blacklist; true
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else
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throw "whitelistedLicenses and blacklistedLicenses are not mutually exclusive.";
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hasLicense = attrs:
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attrs ? meta.license;
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hasWhitelistedLicense = assert areLicenseListsValid; attrs:
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hasLicense attrs && builtins.elem attrs.meta.license whitelist;
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hasBlacklistedLicense = assert areLicenseListsValid; attrs:
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hasLicense attrs && builtins.elem attrs.meta.license blacklist;
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allowBroken = config.allowBroken or false || builtins.getEnv "NIXPKGS_ALLOW_BROKEN" == "1";
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allowUnsupportedSystem = config.allowUnsupportedSystem or false;
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isUnfree = licenses: lib.lists.any (l:
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!l.free or true || l == "unfree" || l == "unfree-redistributable") licenses;
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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 "flashplayer-" 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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!allowUnfree &&
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hasLicense attrs &&
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isUnfree (lib.lists.toList attrs.meta.license) &&
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!allowUnfreePredicate attrs;
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allowInsecureDefaultPredicate = x: builtins.elem x.name (config.permittedInsecurePackages or []);
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allowInsecurePredicate = x: (config.allowInsecurePredicate or allowInsecureDefaultPredicate) x;
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hasAllowedInsecure = attrs:
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(attrs.meta.knownVulnerabilities or []) == [] ||
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allowInsecurePredicate attrs ||
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builtins.getEnv "NIXPKGS_ALLOW_INSECURE" == "1";
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showLicense = license: license.shortName or "unknown";
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pos_str = meta.position or "«unknown-file»";
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remediation = {
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unfree = remediate_whitelist "Unfree";
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broken = remediate_whitelist "Broken";
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blacklisted = x: "";
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insecure = remediate_insecure;
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unknown-meta = x: "";
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};
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remediate_whitelist = allow_attr: attrs:
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''
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a) For `nixos-rebuild` you can set
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{ nixpkgs.config.allow${allow_attr} = true; }
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in configuration.nix to override this.
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b) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
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{ allow${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: " - ${issue}\n") attrs.meta.knownVulnerabilities)) + ''
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You can install it anyway by whitelisting this package, using the
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following methods:
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a) for `nixos-rebuild` you can add ‘${attrs.name or "«name-missing»"}’ 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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"${attrs.name or "«name-missing»"}"
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];
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}
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b) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
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‘${attrs.name or "«name-missing»"}’ 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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"${attrs.name or "«name-missing»"}"
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];
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}
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'';
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handleEvalIssue = attrs: { reason , errormsg ? "" }:
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let
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msg = ''
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Package ‘${attrs.name or "«name-missing»"}’ in ${pos_str} ${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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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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license = either (listOf lib.types.attrs) (either lib.types.attrs str);
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maintainers = listOf str;
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priority = int;
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platforms = listOf (either str lib.systems.parsed.types.system);
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hydraPlatforms = listOf str;
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broken = bool;
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# Weirder stuff that doesn't appear in the documentation?
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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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updateWalker = bool;
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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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repositories = attrsOf str;
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isBuildPythonPackage = platforms;
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schedulingPriority = int;
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downloadURLRegexp = str;
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isFcitxEngine = bool;
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isIbusEngine = bool;
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isGutenprint = bool;
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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: "'${x}'") (lib.attrNames metaTypes)}]";
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checkMeta = meta: if shouldCheckMeta then lib.remove null (lib.mapAttrsToList checkMetaAttr meta) else [];
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checkPlatform = attrs:
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lib.any (lib.meta.platformMatch hostPlatform) attrs.meta.platforms;
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# Check if a derivation is valid, that is whether it passes checks for
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# e.g brokenness or license.
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#
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# Return { valid: Bool } and additionally
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# { reason: String; errormsg: String } if it is not valid, where
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# reason is one of "unfree", "blacklisted" or "broken".
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checkValidity = attrs:
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if hasDeniedUnfreeLicense attrs && !(hasWhitelistedLicense attrs) then
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{ valid = false; reason = "unfree"; errormsg = "has an unfree license (‘${showLicense attrs.meta.license}’)"; }
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else if hasBlacklistedLicense attrs then
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{ valid = false; reason = "blacklisted"; errormsg = "has a blacklisted license (‘${showLicense attrs.meta.license}’)"; }
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else if !allowBroken && attrs.meta.broken or false then
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{ valid = false; reason = "broken"; errormsg = "is marked as broken"; }
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else if !allowUnsupportedSystem && !allowBroken && attrs.meta.platforms or null != null && !(checkPlatform attrs) then
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{ valid = false; reason = "broken"; errormsg = "is not supported on ‘${hostPlatform.config}’"; }
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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 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 = 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 attrs (removeAttrs validity ["valid"])
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else true;
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};
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in assertValidity
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