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Diffstat (limited to 'script/deb-systemd-invoke')
| -rwxr-xr-x | script/deb-systemd-invoke | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/script/deb-systemd-invoke b/script/deb-systemd-invoke new file mode 100755 index 0000000..c2e07f7 --- /dev/null +++ b/script/deb-systemd-invoke @@ -0,0 +1,159 @@ +#!/usr/bin/perl +# vim:ts=4:sw=4:expandtab +# © 2013 Michael Stapelberg <stapelberg@debian.org> +# +# All rights reserved. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions are met: +# +# * Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# +# * Redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in the +# documentation and/or other materials provided with the distribution. +# +# * Neither the name of Michael Stapelberg nor the +# names of contributors may be used to endorse or promote products +# derived from this software without specific prior written permission. +# . +# THIS SOFTWARE IS PROVIDED BY Michael Stapelberg ''AS IS'' AND ANY +# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +# DISCLAIMED. IN NO EVENT SHALL Michael Stapelberg BE LIABLE FOR ANY +# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +=head1 NAME + +deb-systemd-invoke - wrapper around systemctl, respecting policy-rc.d + +=head1 SYNOPSIS + +B<deb-systemd-invoke> [B<--user>] start|stop|restart S<I<unit file> ...> + +=head1 DESCRIPTION + +B<deb-systemd-invoke> is a Debian-specific helper script which asks +/usr/sbin/policy-rc.d before performing a systemctl call. + +B<deb-systemd-invoke> is intended to be used from maintscripts to start +systemd unit files. It is specifically NOT intended to be used interactively by +users. Instead, users should run systemd and use systemctl, or not bother about +the systemd enabled state in case they are not running systemd. + +=cut + +use strict; +use warnings; +use Getopt::Long; # in core since Perl 5 + +if (@ARGV < 2) { + print STDERR "Syntax: $0 <action> <unit file> [<unit file> ...]\n"; + exit 1; +} + +my $is_system = 1; +my @instances = (); +my $result = GetOptions( + "user" => sub { $is_system = 0; }, + "system" => sub { $is_system = 1; }, # default +); + +my $policyhelper = '/usr/sbin/policy-rc.d'; +if (length $ENV{DPKG_ROOT}) { + $policyhelper = $ENV{DPKG_ROOT} . $policyhelper; +} +my @units = @ARGV; +my $action = shift @units; +if (-x $policyhelper) { + for my $unit (@units) { + system(qq|$policyhelper $unit "$action"|); + + # 0 or 104 means run + # 101 means do not run + my $exitcode = ($? >> 8); + if ($exitcode == 101) { + print STDERR "$policyhelper returned 101, not running '" . join(' ', @ARGV) . "'\n"; + exit 0; + } elsif ($exitcode != 104 && $exitcode != 0) { + print STDERR "deb-systemd-invoke only supports $policyhelper return codes 0, 101, and 104!\n"; + print STDERR "Got return code $exitcode, ignoring.\n"; + } + } +} + +if (!$is_system) { + # '--machine <ID>@' was added in v250 and v249.10, before that we can't talk to arbitrary user instances + my $systemctl_version = `systemctl --version --quiet | sed -n -r "s/systemd ([0-9]+) \\(.*/\\1/p"`; + chomp ($systemctl_version); + if (system('dpkg', '--compare-versions', $systemctl_version, 'ge', '249') != 0) { + print STDERR "systemctl version $systemctl_version does not support acting on user instance, skipping\n"; + exit 0; + } + + # Each user instance of the manager has a corresponding user@<id<.service unit. + # Get the full list of IDs, so that we can talk to each user instance to start/stop + # user units. + @instances = `systemctl --no-legend --quiet list-units 'user@*' | sed -n -r 's/.*user@([0-9]+).service.*/\\1/p'`; +} else { + push @instances, 'system'; +} + +# If the job is disabled and is not currently running, the job is not started or restarted. +# However, if the job is disabled but has been forced into the running state, we *do* stop +# and restart it since this is expected behaviour for the admin who forced the start. +# We don't autostart static units either. +if ($action eq "start" || $action eq "restart") { + my $global_exit_code = 0; + my @start_units = (); + + for my $instance (@instances) { + my @instance_args = (); + + if ($instance eq 'system') { + push @instance_args, '--system'; + } else { + chomp ($instance); + push @instance_args, '--user', '--machine', "$instance@"; + } + + for my $unit (@units) { + my $unit_installed = 0; + my $enabled_output = `systemctl @instance_args is-enabled -- '$unit'`; + # matching enabled and enabled-runtime as an installed non static unit + if ($enabled_output =~ /enabled/) { + $unit_installed = 1; + } + system('systemctl', @instance_args, '--quiet', 'is-active', '--', $unit); + my $unit_active = $?>>8 == 0 ? 1 : 0; + if (!$unit_installed && $action eq "start") { + print STDERR "$unit is a disabled or a static unit, not starting it.\n"; + } elsif (!$unit_installed && !$unit_active && $action eq "restart") { + print STDERR "$unit is a disabled or a static unit not running, not starting it.\n"; + } + else { + push @start_units, $unit; + } + } + if (@start_units) { + system('systemctl', '--quiet', @instance_args, $action, @start_units) == 0 or die("Could not execute systemctl: $!"); + } + } + exit(0); +} elsif ($action eq "stop" && !$is_system) { + my $global_exit_code = 0; + + for my $instance (@instances) { + chomp ($instance); + system('systemctl', '--quiet', '--user', '--machine', "$instance@", $action, @units); + } + exit(0); +} else { + exec('systemctl', @ARGV); +} |