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Stop obsolete units, restart changed units, start new units

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This commit is contained in:
Eelco Dolstra 2012-08-02 17:26:23 -04:00
parent 0fc68a3d1d
commit 4d2deff7af
2 changed files with 43 additions and 1 deletions
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42
modules/system/activation/switch-to-configuration.pl
View File

@ -2,7 +2,9 @@
use strict;
use warnings;
use File::Basename;
use File::Slurp;
use Cwd 'abs_path';
my $action = shift @ARGV;
@ -40,6 +42,41 @@ EOF
# virtual console 1 and we restart the "tty1" unit.
$SIG{PIPE} = "IGNORE";
sub getActiveUnits {
# FIXME: use D-Bus or whatever to query this, since parsing the
# output of list-units is likely to break.
my $lines = `@systemd@/bin/systemctl list-units --full`;
my $res = {};
foreach my $line (split '\n', $lines) {
chomp $line;
last if $line eq "";
$line =~ /^(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s/ or next;
next if $1 eq "UNIT";
$res->{$1} = { load => $2, state => $3, substate => $4 };
}
return $res;
}
# Stop all services that no longer exist or have changed in the new
# configuration.
# FIXME: handle template units (e.g. getty@.service).
my $active = getActiveUnits;
foreach my $unitFile (glob "/etc/systemd/system/*") {
next unless -f "$unitFile";
my $unit = basename $unitFile;
my $state = $active->{$unit};
if (defined $state && ($state->{state} eq "active" || $state->{state} eq "activating")) {
my $newUnitFile = "@out@/etc/systemd/system/$unit";
if (! -e $newUnitFile) {
print STDERR "stopping obsolete unit ‘$unit’...\n";
system("@systemd@/bin/systemctl", "stop", $unit); # FIXME: ignore errors?
} elsif (abs_path($unitFile) ne abs_path($newUnitFile)) {
print STDERR "stopping changed unit ‘$unit’...\n";
system("@systemd@/bin/systemctl", "stop", $unit); # FIXME: ignore errors?
}
}
}
# Activate the new configuration (i.e., update /etc, make accounts,
# and so on).
my $res = 0;
@ -51,6 +88,11 @@ system("@out@/activate", "@out@") == 0 or $res = 2;
# Make systemd reload its units.
system("@systemd@/bin/systemctl", "daemon-reload") == 0 or $res = 3;
# Start all units required by the default target. This should start
# all changed units we stopped above as well as any new dependencies.
print STDERR "starting default target...\n";
system("@systemd@/bin/systemctl", "start", "default.target") == 0 or $res = 3;
# Signal dbus to reload its configuration.
system("@systemd@/bin/systemctl", "reload", "dbus.service");

2
modules/system/boot/systemd.nix
View File

@ -324,7 +324,7 @@ let
done
for i in ${toString nixosUnits}; do
cp $i/* $out/
ln -s $i/* $out/
done
${concatStrings (mapAttrsToList (name: unit: