100 lines
3.4 KiB
Perl
100 lines
3.4 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 $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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#system("@installBootLoader@ @out@") == 0 or exit 1 if $action eq "switch" || $action eq "boot";
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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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# 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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# Stop all services that no longer exist or have changed in the new
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# configuration.
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# FIXME: handle template units (e.g. getty@.service).
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my $active = getActiveUnits;
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foreach my $unitFile (glob "/etc/systemd/system/*") {
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next unless -f "$unitFile";
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my $unit = basename $unitFile;
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my $state = $active->{$unit};
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if (defined $state && ($state->{state} eq "active" || $state->{state} eq "activating")) {
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my $newUnitFile = "@out@/etc/systemd/system/$unit";
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if (! -e $newUnitFile) {
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print STDERR "stopping obsolete unit ‘$unit’...\n";
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system("@systemd@/bin/systemctl", "stop", $unit); # FIXME: ignore errors?
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} elsif (abs_path($unitFile) ne abs_path($newUnitFile)) {
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print STDERR "stopping changed unit ‘$unit’...\n";
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system("@systemd@/bin/systemctl", "stop", $unit); # FIXME: ignore errors?
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}
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}
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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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# all 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 = 3;
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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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exit $res;
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