230 lines
8.7 KiB
Nix
230 lines
8.7 KiB
Nix
{ lib, config, pkgs }: with lib;
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rec {
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# Copy configuration files to avoid having the entire sources in the system closure
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copyFile = filePath: pkgs.runCommand (builtins.unsafeDiscardStringContext (builtins.baseNameOf filePath)) {} ''
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cp ${filePath} $out
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'';
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# Check whenever fileSystem is needed for boot. NOTE: Make sure
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# pathsNeededForBoot is closed under the parent relationship, i.e. if /a/b/c
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# is in the list, put /a and /a/b in as well.
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pathsNeededForBoot = [ "/" "/nix" "/nix/store" "/var" "/var/log" "/var/lib" "/var/lib/nixos" "/etc" "/usr" ];
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fsNeededForBoot = fs: fs.neededForBoot || elem fs.mountPoint pathsNeededForBoot;
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# Check whenever `b` depends on `a` as a fileSystem
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fsBefore = a: b:
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let
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# normalisePath adds a slash at the end of the path if it didn't already
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# have one.
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#
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# The reason slashes are added at the end of each path is to prevent `b`
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# from accidentally depending on `a` in cases like
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# a = { mountPoint = "/aaa"; ... }
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# b = { device = "/aaaa"; ... }
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# Here a.mountPoint *is* a prefix of b.device even though a.mountPoint is
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# *not* a parent of b.device. If we add a slash at the end of each string,
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# though, this is not a problem: "/aaa/" is not a prefix of "/aaaa/".
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normalisePath = path: "${path}${optionalString (!(hasSuffix "/" path)) "/"}";
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normalise = mount: mount // { device = normalisePath (toString mount.device);
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mountPoint = normalisePath mount.mountPoint;
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depends = map normalisePath mount.depends;
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};
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a' = normalise a;
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b' = normalise b;
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in hasPrefix a'.mountPoint b'.device
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|| hasPrefix a'.mountPoint b'.mountPoint
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|| any (hasPrefix a'.mountPoint) b'.depends;
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# Escape a path according to the systemd rules. FIXME: slow
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# The rules are described in systemd.unit(5) as follows:
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# The escaping algorithm operates as follows: given a string, any "/" character is replaced by "-", and all other characters which are not ASCII alphanumerics, ":", "_" or "." are replaced by C-style "\x2d" escapes. In addition, "." is replaced with such a C-style escape when it would appear as the first character in the escaped string.
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# When the input qualifies as absolute file system path, this algorithm is extended slightly: the path to the root directory "/" is encoded as single dash "-". In addition, any leading, trailing or duplicate "/" characters are removed from the string before transformation. Example: /foo//bar/baz/ becomes "foo-bar-baz".
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escapeSystemdPath = s: let
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replacePrefix = p: r: s: (if (hasPrefix p s) then r + (removePrefix p s) else s);
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trim = s: removeSuffix "/" (removePrefix "/" s);
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normalizedPath = strings.normalizePath s;
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in
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replaceChars ["/"] ["-"]
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(replacePrefix "." (strings.escapeC ["."] ".")
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(strings.escapeC (stringToCharacters " !\"#$%&'()*+,;<=>=@[\\]^`{|}~-")
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(if normalizedPath == "/" then normalizedPath else trim normalizedPath)));
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# Quotes an argument for use in Exec* service lines.
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# systemd accepts "-quoted strings with escape sequences, toJSON produces
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# a subset of these.
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# Additionally we escape % to disallow expansion of % specifiers. Any lone ;
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# in the input will be turned it ";" and thus lose its special meaning.
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# Every $ is escaped to $$, this makes it unnecessary to disable environment
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# substitution for the directive.
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escapeSystemdExecArg = arg:
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let
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s = if builtins.isPath arg then "${arg}"
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else if builtins.isString arg then arg
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else if builtins.isInt arg || builtins.isFloat arg then toString arg
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else throw "escapeSystemdExecArg only allows strings, paths and numbers";
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in
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replaceChars [ "%" "$" ] [ "%%" "$$" ] (builtins.toJSON s);
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# Quotes a list of arguments into a single string for use in a Exec*
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# line.
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escapeSystemdExecArgs = concatMapStringsSep " " escapeSystemdExecArg;
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# Returns a system path for a given shell package
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toShellPath = shell:
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if types.shellPackage.check shell then
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"/run/current-system/sw${shell.shellPath}"
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else if types.package.check shell then
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throw "${shell} is not a shell package"
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else
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shell;
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/* Recurse into a list or an attrset, searching for attrs named like
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the value of the "attr" parameter, and return an attrset where the
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names are the corresponding jq path where the attrs were found and
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the values are the values of the attrs.
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Example:
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recursiveGetAttrWithJqPrefix {
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example = [
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{
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irrelevant = "not interesting";
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}
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{
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ignored = "ignored attr";
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relevant = {
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secret = {
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_secret = "/path/to/secret";
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};
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};
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}
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];
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} "_secret" -> { ".example[1].relevant.secret" = "/path/to/secret"; }
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*/
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recursiveGetAttrWithJqPrefix = item: attr:
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let
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recurse = prefix: item:
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if item ? ${attr} then
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nameValuePair prefix item.${attr}
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else if isAttrs item then
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map (name:
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let
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escapedName = ''"${replaceChars [''"'' "\\"] [''\"'' "\\\\"] name}"'';
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in
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recurse (prefix + "." + escapedName) item.${name}) (attrNames item)
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else if isList item then
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imap0 (index: item: recurse (prefix + "[${toString index}]") item) item
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else
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[];
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in listToAttrs (flatten (recurse "" item));
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/* Takes an attrset and a file path and generates a bash snippet that
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outputs a JSON file at the file path with all instances of
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{ _secret = "/path/to/secret" }
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in the attrset replaced with the contents of the file
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"/path/to/secret" in the output JSON.
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When a configuration option accepts an attrset that is finally
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converted to JSON, this makes it possible to let the user define
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arbitrary secret values.
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Example:
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If the file "/path/to/secret" contains the string
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"topsecretpassword1234",
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genJqSecretsReplacementSnippet {
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example = [
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{
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irrelevant = "not interesting";
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}
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{
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ignored = "ignored attr";
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relevant = {
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secret = {
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_secret = "/path/to/secret";
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};
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};
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}
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];
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} "/path/to/output.json"
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would generate a snippet that, when run, outputs the following
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JSON file at "/path/to/output.json":
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{
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"example": [
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{
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"irrelevant": "not interesting"
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},
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{
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"ignored": "ignored attr",
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"relevant": {
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"secret": "topsecretpassword1234"
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}
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}
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]
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}
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*/
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genJqSecretsReplacementSnippet = genJqSecretsReplacementSnippet' "_secret";
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# Like genJqSecretsReplacementSnippet, but allows the name of the
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# attr which identifies the secret to be changed.
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genJqSecretsReplacementSnippet' = attr: set: output:
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let
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secrets = recursiveGetAttrWithJqPrefix set attr;
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in ''
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if [[ -h '${output}' ]]; then
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rm '${output}'
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fi
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inherit_errexit_enabled=0
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shopt -pq inherit_errexit && inherit_errexit_enabled=1
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shopt -s inherit_errexit
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''
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+ concatStringsSep
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"\n"
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(imap1 (index: name: ''
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secret${toString index}=$(<'${secrets.${name}}')
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export secret${toString index}
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'')
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(attrNames secrets))
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+ "\n"
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+ "${pkgs.jq}/bin/jq >'${output}' "
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+ lib.escapeShellArg (concatStringsSep
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" | "
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(imap1 (index: name: ''${name} = $ENV.secret${toString index}'')
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(attrNames secrets)))
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+ ''
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<<'EOF'
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${builtins.toJSON set}
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EOF
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(( ! $inherit_errexit_enabled )) && shopt -u inherit_errexit
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'';
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/* Remove packages of packagesToRemove from packages, based on their names.
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Relies on package names and has quadratic complexity so use with caution!
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Type:
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removePackagesByName :: [package] -> [package] -> [package]
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Example:
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removePackagesByName [ nautilus file-roller ] [ file-roller totem ]
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=> [ nautilus ]
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*/
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removePackagesByName = packages: packagesToRemove:
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let
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namesToRemove = map lib.getName packagesToRemove;
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in
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lib.filter (x: !(builtins.elem (lib.getName x) namesToRemove)) packages;
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systemdUtils = {
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lib = import ./systemd-lib.nix { inherit lib config pkgs; };
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unitOptions = import ./systemd-unit-options.nix { inherit lib systemdUtils; };
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types = import ./systemd-types.nix { inherit lib systemdUtils pkgs; };
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};
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}
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