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https://github.com/nix-community/home-manager
synced 2024-11-10 07:04:17 +00:00
Add basic directed acyclic graph data structure
Also make use of this instead of Nixpkgs's strings-with-deps library in activation script generation.
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commit
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4 changed files with 153 additions and 22 deletions
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@ -1,6 +1,7 @@
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{ config, lib, pkgs, ... }:
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with lib;
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with import ./lib/dag.nix;
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let
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@ -241,7 +242,11 @@ in
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//
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(maybeSet "LC_TIME" cfg.language.time);
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home.activation.linkGeneration =
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# A dummy entry acting as a boundary between the activation
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# script's "check" and the "write" phases.
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home.activation.writeBoundary = dagEntryAnywhere "";
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home.activation.linkGeneration = dagEntryAfter ["writeBoundary"] (
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let
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link = pkgs.writeText "link" ''
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newGenFiles="$1"
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@ -303,27 +308,26 @@ in
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else
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echo "Same home files as previous generation ... doing nothing"
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fi
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'';
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''
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);
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home.activation.installPackages =
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''
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$DRY_RUN_CMD nix-env -i ${cfg.path}
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'';
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home.activation.installPackages = dagEntryAfter ["writeBoundary"] ''
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$DRY_RUN_CMD nix-env -i ${cfg.path}
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'';
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home.activationPackage =
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let
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addHeader = n: v:
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v // {
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text = ''
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echo Activating ${n}
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${v.text}
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'';
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};
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toDepString = n: v: if isString v then noDepEntry v else v;
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activationWithDeps =
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mapAttrs addHeader (mapAttrs toDepString cfg.activation);
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mkCmd = res: ''
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echo Activating ${res.name}
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${res.data}
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'';
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sortedCommands = dagTopoSort cfg.activation;
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activationCmds =
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textClosureMap id activationWithDeps (attrNames activationWithDeps);
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if sortedCommands ? result then
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concatStringsSep "\n" (map mkCmd sortedCommands.result)
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else
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abort ("Dependency cycle in activation script: "
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+ builtins.toJSON sortedCommands);
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sf = pkgs.writeText "activation-script" ''
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#!${pkgs.stdenv.shell}
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124
modules/lib/dag.nix
Normal file
124
modules/lib/dag.nix
Normal file
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@ -0,0 +1,124 @@
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# A generalization of Nixpkgs's `strings-with-deps.nix`.
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#
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# The main differences from the Nixpkgs version are
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#
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# - not specific to strings, i.e., any payload is OK,
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#
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# - the addition of the function `dagEntryBefore` indicating a
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# "wanted by" relationship.
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with import <nixpkgs/lib/strings.nix>;
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with import <nixpkgs/lib/attrsets.nix>;
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with import <nixpkgs/lib/lists.nix>;
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rec {
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emptyDag = {};
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isDag = dag:
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let
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isEntry = e: (e ? data) && (e ? after) && (e ? before);
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in
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builtins.isAttrs dag && all (x: x) (mapAttrsToList (n: isEntry) dag);
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# Takes an attribute set containing entries built by
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# dagEntryAnywhere, dagEntryAfter, and dagEntryBefore to a
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# topologically sorted list of entries.
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#
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# Internally this function uses the `toposort` function in
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# `<nixpkgs/lib/lists.nix>` and its value is accordingly.
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#
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# Specifically, the result on success is
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#
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# { result = [{name = ?; data = ?;} …] }
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#
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# For example
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#
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# nix-repl> dagTopoSort {
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# a = dagEntryAnywhere "1";
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# b = dagEntryAfter ["a" "c"] "2";
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# c = dagEntryBefore ["d"] "3";
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# d = dagEntryBefore ["e"] "4";
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# e = dagEntryAnywhere "5";
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# } == {
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# result = [
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# { data = "1"; name = "a"; }
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# { data = "3"; name = "c"; }
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# { data = "2"; name = "b"; }
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# { data = "4"; name = "d"; }
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# { data = "5"; name = "e"; }
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# ];
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# }
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# true
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#
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# And the result on error is
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#
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# {
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# cycle = [ {after = ?; name = ?; data = ?} … ];
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# loops = [ {after = ?; name = ?; data = ?} … ];
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# }
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#
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# For example
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#
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# nix-repl> dagTopoSort {
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# a = dagEntryAnywhere "1";
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# b = dagEntryAfter ["a" "c"] "2";
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# c = dagEntryAfter ["d"] "3";
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# d = dagEntryAfter ["b"] "4";
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# e = dagEntryAnywhere "5";
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# } == {
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# cycle = [
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# { after = ["a" "c"]; data = "2"; name = "b"; }
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# { after = ["d"]; data = "3"; name = "c"; }
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# { after = ["b"]; data = "4"; name = "d"; }
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# ];
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# loops = [
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# { after = ["a" "c"]; data = "2"; name = "b"; }
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# ];
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# } == {}
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# true
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dagTopoSort = dag:
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let
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dagBefore = dag: name:
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mapAttrsToList (n: v: n) (
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filterAttrs (n: v: any (a: a == name) v.before) dag
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);
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normalizedDag =
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mapAttrs (n: v: {
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name = n;
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data = v.data;
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after = v.after ++ dagBefore dag n;
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}) dag;
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before = a: b: any (c: a.name == c) b.after;
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sorted = toposort before (mapAttrsToList (n: v: v) normalizedDag);
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in
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if sorted ? result then
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{ result = map (v: { inherit (v) name data; }) sorted.result; }
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else
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sorted;
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# Applies a function to each element of the given DAG.
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dagMap = f: dag: mapAttrs (n: v: v // { data = f n v.data; }) dag;
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# Create a DAG entry with no particular dependency information.
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dagEntryAnywhere = data: {
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inherit data;
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before = [];
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after = [];
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};
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dagEntryBetween = before: after: data: {
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inherit data before after;
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};
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dagEntryAfter = after: data: {
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inherit data after;
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before = [];
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};
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dagEntryBefore = before: data: {
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inherit data before;
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after = [];
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};
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}
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@ -1,6 +1,7 @@
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{ config, lib, pkgs, ... }:
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with lib;
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with import ../lib/dag.nix;
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let
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@ -177,18 +178,19 @@ in
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config = mkIf cfg.enable {
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home.packages = [ pkgs.gnome3.gnome_terminal ];
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home.activation.gnomeTerminal =
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# The dconf service needs to be installed and prepared.
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home.activation.gnomeTerminal = dagEntryAfter ["installPackages"] (
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let
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sf = pkgs.writeText "gnome-terminal.ini" (toINI (buildIniSet cfg));
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dconfPath = "/org/gnome/terminal/legacy/";
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in
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# The dconf service needs to be installed and prepared.
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stringAfter [ "installPackages" ] ''
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''
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if [[ -v DRY_RUN ]]; then
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echo ${pkgs.gnome3.dconf}/bin/dconf load ${dconfPath} "<" ${sf}
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else
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${pkgs.gnome3.dconf}/bin/dconf load ${dconfPath} < ${sf}
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fi
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'';
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''
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);
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};
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}
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@ -1,6 +1,7 @@
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{ config, lib, pkgs, ... }:
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with lib;
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with import ./lib/dag.nix;
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let
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(buildServices "timer" config.systemd.user.timers)
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);
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home.activation.reloadSystemD = ''
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home.activation.reloadSystemD = dagEntryAfter ["linkGeneration"] ''
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function systemdPostReload() {
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local workDir
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workDir="$(mktemp -d)"
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