Merge pull request #31805 from gleber/make-switch-to-configuration-pure

nixos/system: make switch-to-configuration script pure

nixos/modules/system/activation/switch-to-configuration.pl

···
 
 my $action = shift @ARGV;
 
+if ("@localeArchive@" ne "") {
+    $ENV{LOCALE_ARCHIVE} = "@localeArchive@";
+}
+
 if (!defined $action || ($action ne "switch" && $action ne "boot" && $action ne "test" && $action ne "dry-activate")) {
     print STDERR <<EOF;
 Usage: $0 [switch|boot|test]
···
 sub getActiveUnits {
     # FIXME: use D-Bus or whatever to query this, since parsing the
     # output of list-units is likely to break.
-    my $lines = `LANG= systemctl list-units --full --no-legend`;
+    # Use current version of systemctl binary before daemon is reexeced.
+    my $lines = `LANG= /run/current-system/sw/bin/systemctl list-units --full --no-legend`;
     my $res = {};
     foreach my $line (split '\n', $lines) {
         chomp $line;
···
 
 sub pathToUnitName {
     my ($path) = @_;
-    open my $cmd, "-|", "@systemd@/bin/systemd-escape", "--suffix=mount", "-p", $path
+    # Use current version of systemctl binary before daemon is reexeced.
+    open my $cmd, "-|", "/run/current-system/sw/bin/systemd-escape", "--suffix=mount", "-p", $path
         or die "Unable to escape $path!\n";
     my $escaped = join "", <$cmd>;
     chomp $escaped;
···
 if (scalar (keys %unitsToStop) > 0) {
     print STDERR "stopping the following units: ", join(", ", @unitsToStopFiltered), "\n"
         if scalar @unitsToStopFiltered;
-    system("systemctl", "stop", "--", sort(keys %unitsToStop)); # FIXME: ignore errors?
+    # Use current version of systemctl binary before daemon is reexeced.
+    system("/run/current-system/sw/bin/systemctl", "stop", "--", sort(keys %unitsToStop)); # FIXME: ignore errors?
 }
 
 print STDERR "NOT restarting the following changed units: ", join(", ", sort(keys %unitsToSkip)), "\n"

nixos/modules/system/activation/top-level.nix

···
      cloner false config.nesting.children
   ++ cloner true config.nesting.clone;
 
-
   systemBuilder =
     let
       kernelPath = "${config.boot.kernelPackages.kernel}/" +
···
       done
 
       mkdir $out/bin
+      export localeArchive="${config.i18n.glibcLocales}/lib/locale/locale-archive"
       substituteAll ${./switch-to-configuration.pl} $out/bin/switch-to-configuration
       chmod +x $out/bin/switch-to-configuration
 

nixos/release-combined.nix

···
         (all nixos.tests.sddm.default)
         (all nixos.tests.simple)
         (all nixos.tests.slim)
+        (all nixos.tests.switchTest)
         (all nixos.tests.udisks2)
         (all nixos.tests.xfce)
 

nixos/release.nix

···
   tests.slim = callTest tests/slim.nix {};
   tests.smokeping = callTest tests/smokeping.nix {};
   tests.snapper = callTest tests/snapper.nix {};
+  tests.switchTest = callTest tests/switch-test.nix {};
   tests.taskserver = callTest tests/taskserver.nix {};
   tests.tomcat = callTest tests/tomcat.nix {};
   tests.udisks2 = callTest tests/udisks2.nix {};

nixos/tests/switch-test.nix

···
+# Test configuration switching.
+
+import ./make-test.nix ({ pkgs, ...} : {
+  name = "switch-test";
+  meta = with pkgs.stdenv.lib.maintainers; {
+    maintainers = [ gleber ];
+  };
+
+  nodes = {
+    machine = { config, lib, pkgs, ... }: {
+      users.mutableUsers = false;
+    };
+    other = { config, lib, pkgs, ... }: {
+      users.mutableUsers = true;
+    };
+  };
+
+  testScript = {nodes, ...}: let
+    originalSystem = nodes.machine.config.system.build.toplevel;
+    otherSystem = nodes.other.config.system.build.toplevel;
+  in ''
+    $machine->succeed("env -i ${originalSystem}/bin/switch-to-configuration test | tee /dev/stderr");
+    $machine->succeed("env -i ${otherSystem}/bin/switch-to-configuration test | tee /dev/stderr");
+  '';
+})