147 lines
5 KiB
Perl
147 lines
5 KiB
Perl
#! @perl@
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use strict;
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use warnings;
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use File::Basename;
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use File::Slurp;
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use Cwd 'abs_path';
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my $restartListFile = "/run/systemd/restart-list";
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my $action = shift @ARGV;
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if (!defined $action || ($action ne "switch" && $action ne "boot" && $action ne "test")) {
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print STDERR <<EOF;
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Usage: $0 [switch|boot|test]
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switch: make the configuration the boot default and activate now
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boot: make the configuration the boot default
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test: activate the configuration, but don\'t make it the boot default
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EOF
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exit 1;
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}
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die "This is not a NixOS installation (/etc/NIXOS is missing)!\n" unless -f "/etc/NIXOS";
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# Install or update the bootloader.
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if ($action eq "switch" || $action eq "boot") {
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system("@installBootLoader@ @out@") == 0 or exit 1;
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exit 0 if $action eq "boot";
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}
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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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# FIXME: use D-Bus or whatever to query this, since parsing the
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# output of list-units is likely to break.
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my $lines = `@systemd@/bin/systemctl list-units --full`;
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my $res = {};
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foreach my $line (split '\n', $lines) {
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chomp $line;
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last if $line eq "";
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$line =~ /^(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s/ or next;
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next if $1 eq "UNIT";
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$res->{$1} = { load => $2, state => $3, substate => $4 };
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}
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return $res;
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}
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# Forget about previously failed services.
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system("@systemd@/bin/systemctl", "reset-failed");
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# Stop all services that no longer exist or have changed in the new
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# configuration.
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my @unitsToStop;
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my $activePrev = getActiveUnits;
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while (my ($unit, $state) = each %{$activePrev}) {
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my $baseUnit = $unit;
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# Recognise template instances.
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$baseUnit = "$1\@.$2" if $unit =~ /^(.*)@[^\.]*\.(.*)$/;
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my $prevUnitFile = "/etc/systemd/system/$baseUnit";
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if (-e $prevUnitFile && ($state->{state} eq "active" || $state->{state} eq "activating")) {
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my $newUnitFile = "@out@/etc/systemd/system/$baseUnit";
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if (! -e $newUnitFile) {
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push @unitsToStop, $unit;
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} elsif (abs_path($prevUnitFile) ne abs_path($newUnitFile)) {
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# Record that this unit needs to be started below. We
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# write this to a file to ensure that the service gets
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# restarted if we're interrupted.
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write_file($restartListFile, { append => 1 }, "$unit\n");
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push @unitsToStop, $unit;
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}
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}
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}
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if (scalar @unitsToStop > 0) {
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print STDERR "stopping the following units: ", join(", ", sort(@unitsToStop)), "\n";
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system("@systemd@/bin/systemctl", "stop", @unitsToStop); # FIXME: ignore errors?
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}
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# Activate the new configuration (i.e., update /etc, make accounts,
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# and so on).
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my $res = 0;
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print STDERR "activating the configuration...\n";
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system("@out@/activate", "@out@") == 0 or $res = 2;
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# FIXME: Re-exec systemd if necessary.
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# Make systemd reload its units.
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system("@systemd@/bin/systemctl", "daemon-reload") == 0 or $res = 3;
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# Start all units required by the default target. This should start
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# most changed units we stopped above as well as any new dependencies.
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print STDERR "starting default target...\n";
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system("@systemd@/bin/systemctl", "start", "default.target") == 0 or $res = 4;
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# Start changed units we stopped above. This is necessary because
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# some may not be dependencies of the default target (i.e., they were
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# manually started).
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my @stopped = split '\n', read_file($restartListFile, err_mode => 'quiet') // "";
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if (scalar @stopped > 0) {
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my %unique = map { $_, 1 } @stopped;
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my @unique = sort(keys(%unique));
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print STDERR "restarting the following units: ", join(", ", @unique), "\n";
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system("@systemd@/bin/systemctl", "start", @unique) == 0 or $res = 4;
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unlink($restartListFile);
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}
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# Signal dbus to reload its configuration.
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system("@systemd@/bin/systemctl", "reload", "dbus.service");
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# Print failed and new units.
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my (@failed, @new, @restarting);
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my $activeNew = getActiveUnits;
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while (my ($unit, $state) = each %{$activeNew}) {
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push @failed, $unit if $state->{state} eq "failed" || $state->{substate} eq "auto-restart";
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push @new, $unit if $state->{state} ne "failed" && !defined $activePrev->{$unit};
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}
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print STDERR "the following new units were started: ", join(", ", sort(@new)), "\n"
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if scalar @new > 0;
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if (scalar @failed > 0) {
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print STDERR "warning: the following units failed: ", join(", ", sort(@failed)), "\n";
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foreach my $unit (@failed) {
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print STDERR "\n";
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system("COLUMNS=1000 @systemd@/bin/systemctl status --no-pager '$unit' >&2");
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}
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$res = 4;
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}
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exit $res;
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