112 lines
4.3 KiB
Perl
Executable File
112 lines
4.3 KiB
Perl
Executable File
#!/usr/bin/perl
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# vim:ts=4:sw=4:expandtab
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# © 2013 Michael Stapelberg <stapelberg@debian.org>
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#
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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#
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# * Neither the name of Michael Stapelberg nor the
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# names of contributors may be used to endorse or promote products
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# derived from this software without specific prior written permission.
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# .
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# THIS SOFTWARE IS PROVIDED BY Michael Stapelberg ''AS IS'' AND ANY
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# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# DISCLAIMED. IN NO EVENT SHALL Michael Stapelberg BE LIABLE FOR ANY
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# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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=head1 NAME
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deb-systemd-invoke - wrapper around systemctl, respecting policy-rc.d
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=head1 SYNOPSIS
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B<deb-systemd-invoke> start|stop|restart S<I<unit file> ...>
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=head1 DESCRIPTION
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B<deb-systemd-invoke> is a Debian-specific helper script which asks
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/usr/sbin/policy-rc.d before performing a systemctl call.
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B<deb-systemd-invoke> is intended to be used from maintscripts to start
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systemd unit files. It is specifically NOT intended to be used interactively by
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users. Instead, users should run systemd and use systemctl, or not bother about
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the systemd enabled state in case they are not running systemd.
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=cut
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use strict;
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use warnings;
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if (@ARGV < 2) {
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print STDERR "Syntax: $0 <action> <unit file> [<unit file> ...]\n";
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exit 1;
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}
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my $policyhelper = '/usr/sbin/policy-rc.d';
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my @units = @ARGV;
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my $action = shift @units;
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if (-x $policyhelper) {
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for my $unit (@units) {
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system(qq|$policyhelper $unit "$action"|);
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# 0 or 104 means run
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# 101 means do not run
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my $exitcode = ($? >> 8);
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if ($exitcode == 101) {
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print STDERR "$policyhelper returned 101, not running '" . join(' ', @ARGV) . "'\n";
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exit 0;
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} elsif ($exitcode != 104 && $exitcode != 0) {
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print STDERR "deb-systemd-invoke only supports $policyhelper return codes 0, 101, and 104!\n";
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print STDERR "Got return code $exitcode, ignoring.\n";
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}
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}
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}
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# If the job is disabled and is not currently running, the job is not started or restarted.
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# However, if the job is disabled but has been forced into the running state, we *do* stop
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# and restart it since this is expected behaviour for the admin who forced the start.
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# We don't autostart static units either.
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if ($action eq "start" || $action eq "restart") {
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my $global_exit_code = 0;
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my @start_units = ();
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for my $unit (@units) {
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my $unit_installed = 0;
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my $enabled_output = `/bin/systemctl is-enabled -- '$unit'`;
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# matching enabled and enabled-runtime as an installed non static unit
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if ($enabled_output =~ /enabled/) {
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$unit_installed = 1;
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}
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system('/bin/systemctl', '--quiet', 'is-active', '--', $unit);
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my $unit_active = $?>>8 == 0 ? 1 : 0;
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if (!$unit_installed && $action eq "start") {
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print STDERR "$unit is a disabled or a static unit, not starting it.\n";
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} elsif (!$unit_installed && !$unit_active && $action eq "restart") {
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print STDERR "$unit is a disabled or a static unit not running, not starting it.\n";
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}
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else {
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push @start_units, $unit;
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}
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}
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if (@start_units) {
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exec('/bin/systemctl', $action, @start_units) or die("Could not execute systemctl: $!");
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}
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exit(0);
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} else {
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exec '/bin/systemctl', @ARGV;
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}
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