776 lines
31 KiB
Perl
776 lines
31 KiB
Perl
#! @perl@/bin/perl
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use strict;
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use warnings;
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use Config::IniFiles;
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use File::Path qw(make_path);
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use File::Basename;
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use File::Slurp qw(read_file write_file edit_file);
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use Net::DBus;
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use Sys::Syslog qw(:standard :macros);
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use Cwd 'abs_path';
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my $out = "@out@";
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my $curSystemd = abs_path("/run/current-system/sw/bin");
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# To be robust against interruption, record what units need to be started etc.
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my $startListFile = "/run/nixos/start-list";
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my $restartListFile = "/run/nixos/restart-list";
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my $reloadListFile = "/run/nixos/reload-list";
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# Parse restart/reload requests by the activation script.
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# Activation scripts may write newline-separated units to the restart
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# file and switch-to-configuration will handle them. While
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# `stopIfChanged = true` is ignored, switch-to-configuration will
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# handle `restartIfChanged = false` and `reloadIfChanged = true`.
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# This is the same as specifying a restart trigger in the NixOS module.
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#
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# The reload file asks the script to reload a unit. This is the same as
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# specifying a reload trigger in the NixOS module and can be ignored if
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# the unit is restarted in this activation.
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my $restartByActivationFile = "/run/nixos/activation-restart-list";
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my $reloadByActivationFile = "/run/nixos/activation-reload-list";
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my $dryRestartByActivationFile = "/run/nixos/dry-activation-restart-list";
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my $dryReloadByActivationFile = "/run/nixos/dry-activation-reload-list";
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make_path("/run/nixos", { mode => oct(755) });
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my $action = shift @ARGV;
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if ("@localeArchive@" ne "") {
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$ENV{LOCALE_ARCHIVE} = "@localeArchive@";
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}
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if (!defined $action || ($action ne "switch" && $action ne "boot" && $action ne "test" && $action ne "dry-activate")) {
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print STDERR <<EOF;
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Usage: $0 [switch|boot|test]
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switch: make the configuration the boot default and activate now
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boot: make the configuration the boot default
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test: activate the configuration, but don\'t make it the boot default
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dry-activate: show what would be done if this configuration were activated
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EOF
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exit 1;
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}
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$ENV{NIXOS_ACTION} = $action;
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# This is a NixOS installation if it has /etc/NIXOS or a proper
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# /etc/os-release.
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die "This is not a NixOS installation!\n" unless
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-f "/etc/NIXOS" || (read_file("/etc/os-release", err_mode => 'quiet') // "") =~ /ID="?nixos"?/s;
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openlog("nixos", "", LOG_USER);
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# Install or update the bootloader.
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if ($action eq "switch" || $action eq "boot") {
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system("@installBootLoader@ $out") == 0 or exit 1;
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}
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# Just in case the new configuration hangs the system, do a sync now.
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system("@coreutils@/bin/sync", "-f", "/nix/store") unless ($ENV{"NIXOS_NO_SYNC"} // "") eq "1";
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exit 0 if $action eq "boot";
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# Check if we can activate the new configuration.
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my $oldVersion = read_file("/run/current-system/init-interface-version", err_mode => 'quiet') // "";
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my $newVersion = read_file("$out/init-interface-version");
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if ($newVersion ne $oldVersion) {
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print STDERR <<EOF;
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Warning: the new NixOS configuration has an ‘init’ that is
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incompatible with the current configuration. The new configuration
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won\'t take effect until you reboot the system.
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EOF
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exit 100;
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}
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# Ignore SIGHUP so that we're not killed if we're running on (say)
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# virtual console 1 and we restart the "tty1" unit.
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$SIG{PIPE} = "IGNORE";
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sub getActiveUnits {
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my $mgr = Net::DBus->system->get_service("org.freedesktop.systemd1")->get_object("/org/freedesktop/systemd1");
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my $units = $mgr->ListUnitsByPatterns([], []);
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my $res = {};
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for my $item (@$units) {
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my ($id, $description, $load_state, $active_state, $sub_state,
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$following, $unit_path, $job_id, $job_type, $job_path) = @$item;
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next unless $following eq '';
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next if $job_id == 0 and $active_state eq 'inactive';
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$res->{$id} = { load => $load_state, state => $active_state, substate => $sub_state };
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}
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return $res;
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}
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sub parseFstab {
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my ($filename) = @_;
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my ($fss, $swaps);
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foreach my $line (read_file($filename, err_mode => 'quiet')) {
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chomp $line;
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$line =~ s/^\s*#.*//;
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next if $line =~ /^\s*$/;
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my @xs = split / /, $line;
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if ($xs[2] eq "swap") {
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$swaps->{$xs[0]} = { options => $xs[3] // "" };
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} else {
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$fss->{$xs[1]} = { device => $xs[0], fsType => $xs[2], options => $xs[3] // "" };
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}
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}
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return ($fss, $swaps);
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}
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# This subroutine takes a single ini file that specified systemd configuration
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# like unit configuration and parses it into a hash where the keys are the sections
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# of the unit file and the values are hashes themselves. These hashes have the unit file
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# keys as their keys (left side of =) and an array of all values that were set as their
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# values. If a value is empty (for example `ExecStart=`), then all current definitions are
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# removed.
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#
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# Instead of returning the hash, this subroutine takes a hashref to return the data in. This
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# allows calling the subroutine multiple times with the same hash to parse override files.
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sub parseSystemdIni {
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my ($unitContents, $path) = @_;
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# Tie the ini file to a hash for easier access
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my %fileContents;
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tie %fileContents, "Config::IniFiles", (-file => $path, -allowempty => 1, -allowcontinue => 1);
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# Copy over all sections
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foreach my $sectionName (keys %fileContents) {
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if ($sectionName eq "Install") {
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# Skip the [Install] section because it has no relevant keys for us
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next;
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}
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# Copy over all keys
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foreach my $iniKey (keys %{$fileContents{$sectionName}}) {
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# Ensure the value is an array so it's easier to work with
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my $iniValue = $fileContents{$sectionName}{$iniKey};
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my @iniValues;
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if (ref($iniValue) eq "ARRAY") {
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@iniValues = @{$iniValue};
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} else {
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@iniValues = $iniValue;
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}
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# Go over all values
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for my $iniValue (@iniValues) {
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# If a value is empty, it's an override that tells us to clean the value
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if ($iniValue eq "") {
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delete $unitContents->{$sectionName}->{$iniKey};
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next;
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}
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push(@{$unitContents->{$sectionName}->{$iniKey}}, $iniValue);
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}
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}
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}
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return;
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}
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# This subroutine takes the path to a systemd configuration file (like a unit configuration),
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# parses it, and returns a hash that contains the contents. The contents of this hash are
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# explained in the `parseSystemdIni` subroutine. Neither the sections nor the keys inside
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# the sections are consistently sorted.
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#
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# If a directory with the same basename ending in .d exists next to the unit file, it will be
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# assumed to contain override files which will be parsed as well and handled properly.
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sub parse_unit {
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my ($unit_path) = @_;
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# Parse the main unit and all overrides
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my %unit_data;
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# Replace \ with \\ so glob() still works with units that have a \ in them
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# Valid characters in unit names are ASCII letters, digits, ":", "-", "_", ".", and "\"
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$unit_path =~ s/\\/\\\\/gmsx;
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foreach (glob "${unit_path}{,.d/*.conf}") {
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parseSystemdIni(\%unit_data, "$_")
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}
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return %unit_data;
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}
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# Checks whether a specified boolean in a systemd unit is true
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# or false, with a default that is applied when the value is not set.
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sub parseSystemdBool {
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my ($unitConfig, $sectionName, $boolName, $default) = @_;
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my @values = @{$unitConfig->{$sectionName}{$boolName} // []};
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# Return default if value is not set
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if (scalar @values lt 1 || not defined $values[-1]) {
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return $default;
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}
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# If value is defined multiple times, use the last definition
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my $last = $values[-1];
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# These are valid values as of systemd.syntax(7)
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return $last eq "1" || $last eq "yes" || $last eq "true" || $last eq "on";
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}
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sub recordUnit {
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my ($fn, $unit) = @_;
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write_file($fn, { append => 1 }, "$unit\n") if $action ne "dry-activate";
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}
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# The opposite of recordUnit, removes a unit name from a file
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sub unrecord_unit {
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my ($fn, $unit) = @_;
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edit_file { s/^$unit\n//msx } $fn if $action ne "dry-activate";
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}
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# Compare the contents of two unit files and return whether the unit
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# needs to be restarted or reloaded. If the units differ, the service
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# is restarted unless the only difference is `X-Reload-Triggers` in the
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# `Unit` section. If this is the only modification, the unit is reloaded
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# instead of restarted.
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# Returns:
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# - 0 if the units are equal
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# - 1 if the units are different and a restart action is required
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# - 2 if the units are different and a reload action is required
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sub compare_units {
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my ($old_unit, $new_unit) = @_;
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my $ret = 0;
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my $comp_array = sub {
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my ($a, $b) = @_;
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return join("\0", @{$a}) eq join("\0", @{$b});
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};
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# Comparison hash for the sections
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my %section_cmp = map { $_ => 1 } keys %{$new_unit};
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# Iterate over the sections
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foreach my $section_name (keys %{$old_unit}) {
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# Missing section in the new unit?
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if (not exists $section_cmp{$section_name}) {
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if ($section_name eq 'Unit' and %{$old_unit->{'Unit'}} == 1 and defined(%{$old_unit->{'Unit'}}{'X-Reload-Triggers'})) {
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# If a new [Unit] section was removed that only contained X-Reload-Triggers,
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# do nothing.
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next;
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} else {
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return 1;
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}
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}
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delete $section_cmp{$section_name};
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# Comparison hash for the section contents
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my %ini_cmp = map { $_ => 1 } keys %{$new_unit->{$section_name}};
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# Iterate over the keys of the section
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foreach my $ini_key (keys %{$old_unit->{$section_name}}) {
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delete $ini_cmp{$ini_key};
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my @old_value = @{$old_unit->{$section_name}{$ini_key}};
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# If the key is missing in the new unit, they are different...
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if (not $new_unit->{$section_name}{$ini_key}) {
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# ... unless the key that is now missing was the reload trigger
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if ($section_name eq 'Unit' and $ini_key eq 'X-Reload-Triggers') {
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next;
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}
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return 1;
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}
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my @new_value = @{$new_unit->{$section_name}{$ini_key}};
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# If the contents are different, the units are different
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if (not $comp_array->(\@old_value, \@new_value)) {
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# Check if only the reload triggers changed
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if ($section_name eq 'Unit' and $ini_key eq 'X-Reload-Triggers') {
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$ret = 2;
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} else {
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return 1;
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}
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}
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}
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# A key was introduced that was missing in the old unit
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if (%ini_cmp) {
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if ($section_name eq 'Unit' and %ini_cmp == 1 and defined($ini_cmp{'X-Reload-Triggers'})) {
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# If the newly introduced key was the reload triggers, reload the unit
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$ret = 2;
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} else {
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return 1;
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}
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};
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}
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# A section was introduced that was missing in the old unit
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if (%section_cmp) {
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if (%section_cmp == 1 and defined($section_cmp{'Unit'}) and %{$new_unit->{'Unit'}} == 1 and defined(%{$new_unit->{'Unit'}}{'X-Reload-Triggers'})) {
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# If a new [Unit] section was introduced that only contains X-Reload-Triggers,
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# reload instead of restarting
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$ret = 2;
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} else {
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return 1;
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}
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}
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return $ret;
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}
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sub handleModifiedUnit {
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my ($unit, $baseName, $newUnitFile, $newUnitInfo, $activePrev, $unitsToStop, $unitsToStart, $unitsToReload, $unitsToRestart, $unitsToSkip) = @_;
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if ($unit eq "sysinit.target" || $unit eq "basic.target" || $unit eq "multi-user.target" || $unit eq "graphical.target" || $unit =~ /\.path$/ || $unit =~ /\.slice$/) {
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# Do nothing. These cannot be restarted directly.
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# Slices and Paths don't have to be restarted since
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# properties (resource limits and inotify watches)
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# seem to get applied on daemon-reload.
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} elsif ($unit =~ /\.mount$/) {
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# Reload the changed mount unit to force a remount.
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# FIXME: only reload when Options= changed, restart otherwise
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$unitsToReload->{$unit} = 1;
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recordUnit($reloadListFile, $unit);
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} elsif ($unit =~ /\.socket$/) {
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# FIXME: do something?
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# Attempt to fix this: https://github.com/NixOS/nixpkgs/pull/141192
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# Revert of the attempt: https://github.com/NixOS/nixpkgs/pull/147609
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# More details: https://github.com/NixOS/nixpkgs/issues/74899#issuecomment-981142430
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} else {
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my %unitInfo = $newUnitInfo ? %{$newUnitInfo} : parse_unit($newUnitFile);
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if (parseSystemdBool(\%unitInfo, "Service", "X-ReloadIfChanged", 0) and not $unitsToRestart->{$unit} and not $unitsToStop->{$unit}) {
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$unitsToReload->{$unit} = 1;
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recordUnit($reloadListFile, $unit);
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}
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elsif (!parseSystemdBool(\%unitInfo, "Service", "X-RestartIfChanged", 1) || parseSystemdBool(\%unitInfo, "Unit", "RefuseManualStop", 0) || parseSystemdBool(\%unitInfo, "Unit", "X-OnlyManualStart", 0)) {
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$unitsToSkip->{$unit} = 1;
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} else {
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# It doesn't make sense to stop and start non-services because
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# they can't have ExecStop=
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if (!parseSystemdBool(\%unitInfo, "Service", "X-StopIfChanged", 1) || $unit !~ /\.service$/) {
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# This unit should be restarted instead of
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# stopped and started.
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$unitsToRestart->{$unit} = 1;
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recordUnit($restartListFile, $unit);
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# Remove from units to reload so we don't restart and reload
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if ($unitsToReload->{$unit}) {
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delete $unitsToReload->{$unit};
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unrecord_unit($reloadListFile, $unit);
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}
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} else {
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# If this unit is socket-activated, then stop the
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# socket unit(s) as well, and restart the
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# socket(s) instead of the service.
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my $socket_activated = 0;
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if ($unit =~ /\.service$/) {
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my @sockets = split(/ /, join(" ", @{$unitInfo{Service}{Sockets} // []}));
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if (scalar @sockets == 0) {
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@sockets = ("$baseName.socket");
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}
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foreach my $socket (@sockets) {
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if (defined $activePrev->{$socket}) {
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# We can now be sure this is a socket-activate unit
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$unitsToStop->{$socket} = 1;
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# Only restart sockets that actually
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# exist in new configuration:
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if (-e "$out/etc/systemd/system/$socket") {
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$unitsToStart->{$socket} = 1;
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recordUnit($startListFile, $socket);
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$socket_activated = 1;
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}
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# Remove from units to reload so we don't restart and reload
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if ($unitsToReload->{$unit}) {
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delete $unitsToReload->{$unit};
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unrecord_unit($reloadListFile, $unit);
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}
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}
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}
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}
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# If the unit is not socket-activated, record
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# that this unit needs to be started below.
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# We write this to a file to ensure that the
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# service gets restarted if we're interrupted.
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if (!$socket_activated) {
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$unitsToStart->{$unit} = 1;
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recordUnit($startListFile, $unit);
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}
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$unitsToStop->{$unit} = 1;
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# Remove from units to reload so we don't restart and reload
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if ($unitsToReload->{$unit}) {
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delete $unitsToReload->{$unit};
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unrecord_unit($reloadListFile, $unit);
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}
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}
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}
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}
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}
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# Figure out what units need to be stopped, started, restarted or reloaded.
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my (%unitsToStop, %unitsToSkip, %unitsToStart, %unitsToRestart, %unitsToReload);
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my %unitsToFilter; # units not shown
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$unitsToStart{$_} = 1 foreach
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split('\n', read_file($startListFile, err_mode => 'quiet') // "");
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$unitsToRestart{$_} = 1 foreach
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split('\n', read_file($restartListFile, err_mode => 'quiet') // "");
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$unitsToReload{$_} = 1 foreach
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split('\n', read_file($reloadListFile, err_mode => 'quiet') // "");
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my $activePrev = getActiveUnits;
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while (my ($unit, $state) = each %{$activePrev}) {
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my $baseUnit = $unit;
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my $prevUnitFile = "/etc/systemd/system/$baseUnit";
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my $newUnitFile = "$out/etc/systemd/system/$baseUnit";
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# Detect template instances.
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if (!-e $prevUnitFile && !-e $newUnitFile && $unit =~ /^(.*)@[^\.]*\.(.*)$/) {
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$baseUnit = "$1\@.$2";
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$prevUnitFile = "/etc/systemd/system/$baseUnit";
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$newUnitFile = "$out/etc/systemd/system/$baseUnit";
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}
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my $baseName = $baseUnit;
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$baseName =~ s/\.[a-z]*$//;
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if (-e $prevUnitFile && ($state->{state} eq "active" || $state->{state} eq "activating")) {
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if (! -e $newUnitFile || abs_path($newUnitFile) eq "/dev/null") {
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my %unitInfo = parse_unit($prevUnitFile);
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$unitsToStop{$unit} = 1 if parseSystemdBool(\%unitInfo, "Unit", "X-StopOnRemoval", 1);
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}
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elsif ($unit =~ /\.target$/) {
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my %unitInfo = parse_unit($newUnitFile);
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# Cause all active target units to be restarted below.
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# This should start most changed units we stop here as
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# well as any new dependencies (including new mounts and
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# swap devices). FIXME: the suspend target is sometimes
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# active after the system has resumed, which probably
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# should not be the case. Just ignore it.
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if ($unit ne "suspend.target" && $unit ne "hibernate.target" && $unit ne "hybrid-sleep.target") {
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unless (parseSystemdBool(\%unitInfo, "Unit", "RefuseManualStart", 0) || parseSystemdBool(\%unitInfo, "Unit", "X-OnlyManualStart", 0)) {
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$unitsToStart{$unit} = 1;
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recordUnit($startListFile, $unit);
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# Don't spam the user with target units that always get started.
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$unitsToFilter{$unit} = 1;
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}
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}
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|
||
# Stop targets that have X-StopOnReconfiguration set.
|
||
# This is necessary to respect dependency orderings
|
||
# involving targets: if unit X starts after target Y and
|
||
# target Y starts after unit Z, then if X and Z have both
|
||
# changed, then X should be restarted after Z. However,
|
||
# if target Y is in the "active" state, X and Z will be
|
||
# restarted at the same time because X's dependency on Y
|
||
# is already satisfied. Thus, we need to stop Y first.
|
||
# Stopping a target generally has no effect on other units
|
||
# (unless there is a PartOf dependency), so this is just a
|
||
# bookkeeping thing to get systemd to do the right thing.
|
||
if (parseSystemdBool(\%unitInfo, "Unit", "X-StopOnReconfiguration", 0)) {
|
||
$unitsToStop{$unit} = 1;
|
||
}
|
||
}
|
||
|
||
else {
|
||
my %old_unit_info = parse_unit($prevUnitFile);
|
||
my %new_unit_info = parse_unit($newUnitFile);
|
||
my $diff = compare_units(\%old_unit_info, \%new_unit_info);
|
||
if ($diff eq 1) {
|
||
handleModifiedUnit($unit, $baseName, $newUnitFile, \%new_unit_info, $activePrev, \%unitsToStop, \%unitsToStart, \%unitsToReload, \%unitsToRestart, \%unitsToSkip);
|
||
} elsif ($diff eq 2 and not $unitsToRestart{$unit}) {
|
||
$unitsToReload{$unit} = 1;
|
||
recordUnit($reloadListFile, $unit);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
sub pathToUnitName {
|
||
my ($path) = @_;
|
||
# Use current version of systemctl binary before daemon is reexeced.
|
||
open my $cmd, "-|", "$curSystemd/systemd-escape", "--suffix=mount", "-p", $path
|
||
or die "Unable to escape $path!\n";
|
||
my $escaped = join "", <$cmd>;
|
||
chomp $escaped;
|
||
close $cmd or die;
|
||
return $escaped;
|
||
}
|
||
|
||
# Compare the previous and new fstab to figure out which filesystems
|
||
# need a remount or need to be unmounted. New filesystems are mounted
|
||
# automatically by starting local-fs.target. FIXME: might be nicer if
|
||
# we generated units for all mounts; then we could unify this with the
|
||
# unit checking code above.
|
||
my ($prevFss, $prevSwaps) = parseFstab "/etc/fstab";
|
||
my ($newFss, $newSwaps) = parseFstab "$out/etc/fstab";
|
||
foreach my $mountPoint (keys %$prevFss) {
|
||
my $prev = $prevFss->{$mountPoint};
|
||
my $new = $newFss->{$mountPoint};
|
||
my $unit = pathToUnitName($mountPoint);
|
||
if (!defined $new) {
|
||
# Filesystem entry disappeared, so unmount it.
|
||
$unitsToStop{$unit} = 1;
|
||
} elsif ($prev->{fsType} ne $new->{fsType} || $prev->{device} ne $new->{device}) {
|
||
# Filesystem type or device changed, so unmount and mount it.
|
||
$unitsToStop{$unit} = 1;
|
||
$unitsToStart{$unit} = 1;
|
||
recordUnit($startListFile, $unit);
|
||
} elsif ($prev->{options} ne $new->{options}) {
|
||
# Mount options changes, so remount it.
|
||
$unitsToReload{$unit} = 1;
|
||
recordUnit($reloadListFile, $unit);
|
||
}
|
||
}
|
||
|
||
# Also handles swap devices.
|
||
foreach my $device (keys %$prevSwaps) {
|
||
my $prev = $prevSwaps->{$device};
|
||
my $new = $newSwaps->{$device};
|
||
if (!defined $new) {
|
||
# Swap entry disappeared, so turn it off. Can't use
|
||
# "systemctl stop" here because systemd has lots of alias
|
||
# units that prevent a stop from actually calling
|
||
# "swapoff".
|
||
if ($action ne "dry-activate") {
|
||
print STDERR "would stop swap device: $device\n";
|
||
} else {
|
||
print STDERR "stopping swap device: $device\n";
|
||
system("@utillinux@/sbin/swapoff", $device);
|
||
}
|
||
}
|
||
# FIXME: update swap options (i.e. its priority).
|
||
}
|
||
|
||
|
||
# Should we have systemd re-exec itself?
|
||
my $prevSystemd = abs_path("/proc/1/exe") // "/unknown";
|
||
my $prevSystemdSystemConfig = abs_path("/etc/systemd/system.conf") // "/unknown";
|
||
my $newSystemd = abs_path("@systemd@/lib/systemd/systemd") or die;
|
||
my $newSystemdSystemConfig = abs_path("$out/etc/systemd/system.conf") // "/unknown";
|
||
|
||
my $restartSystemd = $prevSystemd ne $newSystemd;
|
||
if ($prevSystemdSystemConfig ne $newSystemdSystemConfig) {
|
||
$restartSystemd = 1;
|
||
}
|
||
|
||
|
||
sub filterUnits {
|
||
my ($units) = @_;
|
||
my @res;
|
||
foreach my $unit (sort(keys %{$units})) {
|
||
push @res, $unit if !defined $unitsToFilter{$unit};
|
||
}
|
||
return @res;
|
||
}
|
||
|
||
my @unitsToStopFiltered = filterUnits(\%unitsToStop);
|
||
|
||
|
||
# Show dry-run actions.
|
||
if ($action eq "dry-activate") {
|
||
print STDERR "would stop the following units: ", join(", ", @unitsToStopFiltered), "\n"
|
||
if scalar @unitsToStopFiltered > 0;
|
||
print STDERR "would NOT stop the following changed units: ", join(", ", sort(keys %unitsToSkip)), "\n"
|
||
if scalar(keys %unitsToSkip) > 0;
|
||
|
||
print STDERR "would activate the configuration...\n";
|
||
system("$out/dry-activate", "$out");
|
||
|
||
# Handle the activation script requesting the restart or reload of a unit.
|
||
foreach (split('\n', read_file($dryRestartByActivationFile, err_mode => 'quiet') // "")) {
|
||
my $unit = $_;
|
||
my $baseUnit = $unit;
|
||
my $newUnitFile = "$out/etc/systemd/system/$baseUnit";
|
||
|
||
# Detect template instances.
|
||
if (!-e $newUnitFile && $unit =~ /^(.*)@[^\.]*\.(.*)$/) {
|
||
$baseUnit = "$1\@.$2";
|
||
$newUnitFile = "$out/etc/systemd/system/$baseUnit";
|
||
}
|
||
|
||
my $baseName = $baseUnit;
|
||
$baseName =~ s/\.[a-z]*$//;
|
||
|
||
# Start units if they were not active previously
|
||
if (not defined $activePrev->{$unit}) {
|
||
$unitsToStart{$unit} = 1;
|
||
next;
|
||
}
|
||
|
||
handleModifiedUnit($unit, $baseName, $newUnitFile, undef, $activePrev, \%unitsToRestart, \%unitsToRestart, \%unitsToReload, \%unitsToRestart, \%unitsToSkip);
|
||
}
|
||
unlink($dryRestartByActivationFile);
|
||
|
||
foreach (split('\n', read_file($dryReloadByActivationFile, err_mode => 'quiet') // "")) {
|
||
my $unit = $_;
|
||
|
||
if (defined($activePrev->{$unit}) and not $unitsToRestart{$unit} and not $unitsToStop{$unit}) {
|
||
$unitsToReload{$unit} = 1;
|
||
recordUnit($reloadListFile, $unit);
|
||
}
|
||
}
|
||
unlink($dryReloadByActivationFile);
|
||
|
||
print STDERR "would restart systemd\n" if $restartSystemd;
|
||
print STDERR "would reload the following units: ", join(", ", sort(keys %unitsToReload)), "\n"
|
||
if scalar(keys %unitsToReload) > 0;
|
||
print STDERR "would restart the following units: ", join(", ", sort(keys %unitsToRestart)), "\n"
|
||
if scalar(keys %unitsToRestart) > 0;
|
||
my @unitsToStartFiltered = filterUnits(\%unitsToStart);
|
||
print STDERR "would start the following units: ", join(", ", @unitsToStartFiltered), "\n"
|
||
if scalar @unitsToStartFiltered;
|
||
exit 0;
|
||
}
|
||
|
||
|
||
syslog(LOG_NOTICE, "switching to system configuration $out");
|
||
|
||
if (scalar (keys %unitsToStop) > 0) {
|
||
print STDERR "stopping the following units: ", join(", ", @unitsToStopFiltered), "\n"
|
||
if scalar @unitsToStopFiltered;
|
||
# Use current version of systemctl binary before daemon is reexeced.
|
||
system("$curSystemd/systemctl", "stop", "--", sort(keys %unitsToStop));
|
||
}
|
||
|
||
print STDERR "NOT restarting the following changed units: ", join(", ", sort(keys %unitsToSkip)), "\n"
|
||
if scalar(keys %unitsToSkip) > 0;
|
||
|
||
# Activate the new configuration (i.e., update /etc, make accounts,
|
||
# and so on).
|
||
my $res = 0;
|
||
print STDERR "activating the configuration...\n";
|
||
system("$out/activate", "$out") == 0 or $res = 2;
|
||
|
||
# Handle the activation script requesting the restart or reload of a unit.
|
||
foreach (split('\n', read_file($restartByActivationFile, err_mode => 'quiet') // "")) {
|
||
my $unit = $_;
|
||
my $baseUnit = $unit;
|
||
my $newUnitFile = "$out/etc/systemd/system/$baseUnit";
|
||
|
||
# Detect template instances.
|
||
if (!-e $newUnitFile && $unit =~ /^(.*)@[^\.]*\.(.*)$/) {
|
||
$baseUnit = "$1\@.$2";
|
||
$newUnitFile = "$out/etc/systemd/system/$baseUnit";
|
||
}
|
||
|
||
my $baseName = $baseUnit;
|
||
$baseName =~ s/\.[a-z]*$//;
|
||
|
||
# Start units if they were not active previously
|
||
if (not defined $activePrev->{$unit}) {
|
||
$unitsToStart{$unit} = 1;
|
||
recordUnit($startListFile, $unit);
|
||
next;
|
||
}
|
||
|
||
handleModifiedUnit($unit, $baseName, $newUnitFile, undef, $activePrev, \%unitsToRestart, \%unitsToRestart, \%unitsToReload, \%unitsToRestart, \%unitsToSkip);
|
||
}
|
||
# We can remove the file now because it has been propagated to the other restart/reload files
|
||
unlink($restartByActivationFile);
|
||
|
||
foreach (split('\n', read_file($reloadByActivationFile, err_mode => 'quiet') // "")) {
|
||
my $unit = $_;
|
||
|
||
if (defined($activePrev->{$unit}) and not $unitsToRestart{$unit} and not $unitsToStop{$unit}) {
|
||
$unitsToReload{$unit} = 1;
|
||
recordUnit($reloadListFile, $unit);
|
||
}
|
||
}
|
||
# We can remove the file now because it has been propagated to the other reload file
|
||
unlink($reloadByActivationFile);
|
||
|
||
# Restart systemd if necessary. Note that this is done using the
|
||
# current version of systemd, just in case the new one has trouble
|
||
# communicating with the running pid 1.
|
||
if ($restartSystemd) {
|
||
print STDERR "restarting systemd...\n";
|
||
system("$curSystemd/systemctl", "daemon-reexec") == 0 or $res = 2;
|
||
}
|
||
|
||
# Forget about previously failed services.
|
||
system("@systemd@/bin/systemctl", "reset-failed");
|
||
|
||
# Make systemd reload its units.
|
||
system("@systemd@/bin/systemctl", "daemon-reload") == 0 or $res = 3;
|
||
|
||
# Reload user units
|
||
open my $listActiveUsers, '-|', '@systemd@/bin/loginctl', 'list-users', '--no-legend';
|
||
while (my $f = <$listActiveUsers>) {
|
||
next unless $f =~ /^\s*(?<uid>\d+)\s+(?<user>\S+)/;
|
||
my ($uid, $name) = ($+{uid}, $+{user});
|
||
print STDERR "reloading user units for $name...\n";
|
||
|
||
system("@su@", "-s", "@shell@", "-l", $name, "-c",
|
||
"export XDG_RUNTIME_DIR=/run/user/$uid; " .
|
||
"$curSystemd/systemctl --user daemon-reexec; " .
|
||
"@systemd@/bin/systemctl --user start nixos-activation.service");
|
||
}
|
||
|
||
close $listActiveUsers;
|
||
|
||
# Set the new tmpfiles
|
||
print STDERR "setting up tmpfiles\n";
|
||
system("@systemd@/bin/systemd-tmpfiles", "--create", "--remove", "--exclude-prefix=/dev") == 0 or $res = 3;
|
||
|
||
# Reload units that need it. This includes remounting changed mount
|
||
# units.
|
||
if (scalar(keys %unitsToReload) > 0) {
|
||
print STDERR "reloading the following units: ", join(", ", sort(keys %unitsToReload)), "\n";
|
||
system("@systemd@/bin/systemctl", "reload", "--", sort(keys %unitsToReload)) == 0 or $res = 4;
|
||
unlink($reloadListFile);
|
||
}
|
||
|
||
# Restart changed services (those that have to be restarted rather
|
||
# than stopped and started).
|
||
if (scalar(keys %unitsToRestart) > 0) {
|
||
print STDERR "restarting the following units: ", join(", ", sort(keys %unitsToRestart)), "\n";
|
||
system("@systemd@/bin/systemctl", "restart", "--", sort(keys %unitsToRestart)) == 0 or $res = 4;
|
||
unlink($restartListFile);
|
||
}
|
||
|
||
# Start all active targets, as well as changed units we stopped above.
|
||
# The latter is necessary because some may not be dependencies of the
|
||
# targets (i.e., they were manually started). FIXME: detect units
|
||
# that are symlinks to other units. We shouldn't start both at the
|
||
# same time because we'll get a "Failed to add path to set" error from
|
||
# systemd.
|
||
my @unitsToStartFiltered = filterUnits(\%unitsToStart);
|
||
print STDERR "starting the following units: ", join(", ", @unitsToStartFiltered), "\n"
|
||
if scalar @unitsToStartFiltered;
|
||
system("@systemd@/bin/systemctl", "start", "--", sort(keys %unitsToStart)) == 0 or $res = 4;
|
||
unlink($startListFile);
|
||
|
||
|
||
# Print failed and new units.
|
||
my (@failed, @new);
|
||
my $activeNew = getActiveUnits;
|
||
while (my ($unit, $state) = each %{$activeNew}) {
|
||
if ($state->{state} eq "failed") {
|
||
push @failed, $unit;
|
||
next;
|
||
}
|
||
|
||
if ($state->{substate} eq "auto-restart") {
|
||
# A unit in auto-restart substate is a failure *if* it previously failed to start
|
||
my $main_status = `@systemd@/bin/systemctl show --value --property=ExecMainStatus '$unit'`;
|
||
chomp($main_status);
|
||
|
||
if ($main_status ne "0") {
|
||
push @failed, $unit;
|
||
next;
|
||
}
|
||
}
|
||
|
||
# Ignore scopes since they are not managed by this script but rather
|
||
# created and managed by third-party services via the systemd dbus API.
|
||
# This only lists units that are not failed (including ones that are in auto-restart but have not failed previously)
|
||
if ($state->{state} ne "failed" && !defined $activePrev->{$unit} && $unit !~ /\.scope$/msx) {
|
||
push @new, $unit;
|
||
}
|
||
}
|
||
|
||
if (scalar @new > 0) {
|
||
print STDERR "the following new units were started: ", join(", ", sort(@new)), "\n"
|
||
}
|
||
|
||
if (scalar @failed > 0) {
|
||
my @failed_sorted = sort @failed;
|
||
print STDERR "warning: the following units failed: ", join(", ", @failed_sorted), "\n\n";
|
||
system "@systemd@/bin/systemctl status --no-pager --full '" . join("' '", @failed_sorted) . "' >&2";
|
||
$res = 4;
|
||
}
|
||
|
||
if ($res == 0) {
|
||
syslog(LOG_NOTICE, "finished switching to system configuration $out");
|
||
} else {
|
||
syslog(LOG_ERR, "switching to system configuration $out failed (status $res)");
|
||
}
|
||
|
||
exit $res;
|