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#! /usr/bin/perl # vim: ft=perl # # update-rc.d Update the links in /etc/rc[0-9S].d/ # use strict; use warnings; # NB: All Perl modules used here must be in perl-base. Specifically, depending # on modules in perl-modules is not okay! See bug #716923 my $initd = "/etc/init.d"; my $etcd = "/etc/rc"; # Print usage message and die. sub usage { print STDERR "update-rc.d: error: @_\n" if ($#_ >= 0); print STDERR <<EOF; usage: update-rc.d [-f] <basename> remove update-rc.d [-f] <basename> defaults update-rc.d [-f] <basename> defaults-disabled update-rc.d <basename> disable|enable [S|2|3|4|5] -f: force The disable|enable API is not stable and might change in the future. EOF exit (1); } exit main(@ARGV); sub info { print STDOUT "update-rc.d: @_\n"; } sub warning { print STDERR "update-rc.d: warning: @_\n"; } sub error { print STDERR "update-rc.d: error: @_\n"; exit (1); } sub error_code { my $rc = shift; print STDERR "update-rc.d: error: @_\n"; exit ($rc); } sub make_path { my ($path) = @_; my @dirs = (); my @path = split /\//, $path; map { push @dirs, $_; mkdir join('/', @dirs), 0755; } @path; } # Given a script name, return any runlevels except 0 or 6 in which the # script is enabled. If that gives nothing and the script is not # explicitly disabled, return 6 if the script is disabled in runlevel # 0 or 6. sub script_runlevels { my ($scriptname) = @_; my @links=<"/etc/rc[S12345].d/S[0-9][0-9]$scriptname">; if (@links) { return map(substr($_, 7, 1), @links); } elsif (! <"/etc/rc[S12345].d/K[0-9][0-9]$scriptname">) { @links=<"/etc/rc[06].d/K[0-9][0-9]$scriptname">; return ("6") if (@links); } else { return ; } } # Map the sysvinit runlevel to that of openrc. sub openrc_rlconv { my %rl_table = ( "S" => "sysinit", "1" => "recovery", "2" => "default", "3" => "default", "4" => "default", "5" => "default", "6" => "off" ); my %seen; # return unique runlevels return grep !$seen{$_}++, map($rl_table{$_}, @_); } sub systemd_reload { if (-d "/run/systemd/system") { system("systemctl", "daemon-reload"); } } # Creates the necessary links to enable/disable a SysV init script (fallback if # no insserv/rc-update exists) sub make_sysv_links { my ($scriptname, $action) = @_; # for "remove" we cannot rely on the init script still being present, as # this gets called in postrm for purging. Just remove all symlinks. if ("remove" eq $action) { unlink($_) for glob("/etc/rc?.d/[SK][0-9][0-9]$scriptname"); return; } # if the service already has any links, do not touch them # numbers we don't care about, but enabled/disabled state we do return if glob("/etc/rc?.d/[SK][0-9][0-9]$scriptname"); # for "defaults", parse Default-{Start,Stop} and create these links my ($lsb_start_ref, $lsb_stop_ref) = parse_def_start_stop("/etc/init.d/$scriptname"); my $start = $action eq "defaults-disabled" ? "K" : "S"; foreach my $lvl (@$lsb_start_ref) { make_path("/etc/rc$lvl.d"); my $l = "/etc/rc$lvl.d/${start}01$scriptname"; symlink("../init.d/$scriptname", $l); } foreach my $lvl (@$lsb_stop_ref) { make_path("/etc/rc$lvl.d"); my $l = "/etc/rc$lvl.d/K01$scriptname"; symlink("../init.d/$scriptname", $l); } } # Creates the necessary links to enable/disable the service (equivalent of an # initscript) in systemd. sub make_systemd_links { my ($scriptname, $action) = @_; # If called by systemctl (via systemd-sysv-install), do nothing to avoid # an endless loop. if (defined($ENV{_SKIP_SYSTEMD_NATIVE}) && $ENV{_SKIP_SYSTEMD_NATIVE} == 1) { return; } # If systemctl is available, let's use that to create the symlinks. if (-x "/bin/systemctl") { # Set this env var to avoid loop in systemd-sysv-install. local $ENV{SYSTEMCTL_SKIP_SYSV} = 1; # Use --quiet to mimic the old update-rc.d behaviour. system("systemctl", "--quiet", "$action", "$scriptname"); return; } # In addition to the insserv call we also enable/disable the service # for systemd by creating the appropriate symlink in case there is a # native systemd service. In case systemd is not installed we do this # on our own instead of using systemctl. my $service_path; if (-f "/etc/systemd/system/$scriptname.service") { $service_path = "/etc/systemd/system/$scriptname.service"; } elsif (-f "/lib/systemd/system/$scriptname.service") { $service_path = "/lib/systemd/system/$scriptname.service"; } if (defined($service_path)) { my $changed_sth; open my $fh, '<', $service_path or error("unable to read $service_path"); while (<$fh>) { chomp; if (/^\s*WantedBy=(.+)$/i) { my $wants_dir = "/etc/systemd/system/$1.wants"; my $service_link = "$wants_dir/$scriptname.service"; if ("enable" eq $action) { make_path($wants_dir); symlink($service_path, $service_link); } else { unlink($service_link) if -e $service_link; } } } close($fh); } } sub create_sequence { my $force = (@_); my $insserv = "/usr/lib/insserv/insserv"; # Fallback for older insserv package versions [2014-04-16] $insserv = "/sbin/insserv" if ( -x "/sbin/insserv"); # If insserv is not configured it is not fully installed my $insserv_installed = -x $insserv && -e "/etc/insserv.conf"; my @opts; push(@opts, '-f') if $force; # Add force flag if initscripts is not installed # This enables inistcripts-less systems to not fail when a facility is missing unshift(@opts, '-f') unless is_initscripts_installed(); my $openrc_installed = -x "/sbin/openrc"; my $sysv_insserv ={}; $sysv_insserv->{remove} = sub { my ($scriptname) = @_; if ( -f "/etc/init.d/$scriptname" ) { return system($insserv, @opts, "-r", $scriptname) >> 8; } else { # insserv removes all dangling symlinks, no need to tell it # what to look for. my $rc = system($insserv, @opts) >> 8; error_code($rc, "insserv rejected the script header") if $rc; } }; $sysv_insserv->{defaults} = sub { my ($scriptname) = @_; if ( -f "/etc/init.d/$scriptname" ) { my $rc = system($insserv, @opts, $scriptname) >> 8; error_code($rc, "insserv rejected the script header") if $rc; } else { error("initscript does not exist: /etc/init.d/$scriptname"); } }; $sysv_insserv->{defaults_disabled} = sub { my ($scriptname) = @_; return if glob("/etc/rc?.d/[SK][0-9][0-9]$scriptname"); if ( -f "/etc/init.d/$scriptname" ) { my $rc = system($insserv, @opts, $scriptname) >> 8; error_code($rc, "insserv rejected the script header") if $rc; } else { error("initscript does not exist: /etc/init.d/$scriptname"); } sysv_toggle("disable", $scriptname); }; $sysv_insserv->{toggle} = sub { my ($action, $scriptname) = (shift, shift); sysv_toggle($action, $scriptname, @_); # Call insserv to resequence modified links my $rc = system($insserv, @opts, $scriptname) >> 8; error_code($rc, "insserv rejected the script header") if $rc; }; my $sysv_plain = {}; $sysv_plain->{remove} = sub { my ($scriptname) = @_; make_sysv_links($scriptname, "remove"); }; $sysv_plain->{defaults} = sub { my ($scriptname) = @_; make_sysv_links($scriptname, "defaults"); }; $sysv_plain->{defaults_disabled} = sub { my ($scriptname) = @_; make_sysv_links($scriptname, "defaults-disabled"); }; $sysv_plain->{toggle} = sub { my ($action, $scriptname) = (shift, shift); sysv_toggle($action, $scriptname, @_); }; my $systemd = {}; $systemd->{remove} = sub { systemd_reload; }; $systemd->{defaults} = sub { systemd_reload; }; $systemd->{defaults_disabled} = sub { systemd_reload; }; $systemd->{toggle} = sub { my ($action, $scriptname) = (shift, shift); make_systemd_links($scriptname, $action); systemd_reload; }; # Should we check exit codeS? my $openrc = {}; $openrc->{remove} = sub { my ($scriptname) = @_; system("rc-update", "-qqa", "delete", $scriptname); }; $openrc->{defaults} = sub { my ($scriptname) = @_; # OpenRC does not distinguish halt and reboot. They are handled # by /etc/init.d/transit instead. return if ("halt" eq $scriptname || "reboot" eq $scriptname); # no need to consider default disabled runlevels # because everything is disabled by openrc by default my @rls=script_runlevels($scriptname); if ( @rls ) { system("rc-update", "add", $scriptname, openrc_rlconv(@rls)); } }; $openrc->{defaults_disabled} = sub { # In openrc everything is disabled by default }; $openrc->{toggle} = sub { my ($action, $scriptname) = (shift, shift); my (@toggle_lvls, $start_lvls, $stop_lvls, @symlinks); my $lsb_header = lsb_header_for_script($scriptname); # Extra arguments to disable|enable action are runlevels. If none # given parse LSB info for Default-Start value. if ($#_ >= 0) { @toggle_lvls = @_; } else { ($start_lvls, $stop_lvls) = parse_def_start_stop($lsb_header); @toggle_lvls = @$start_lvls; if ($#toggle_lvls < 0) { error("$scriptname Default-Start contains no runlevels, aborting."); } } my %openrc_act = ( "disable" => "del", "enable" => "add" ); system("rc-update", $openrc_act{$action}, $scriptname, openrc_rlconv(@toggle_lvls)) }; my @sequence; if ($insserv_installed) { push @sequence, $sysv_insserv; } else { push @sequence, $sysv_plain; } # OpenRC has to be after sysv_{insserv,plain} because it depends on them to synchronize # states. if ($openrc_installed) { push @sequence, $openrc; } push @sequence, $systemd; return @sequence; } ## Dependency based sub main { my @args = @_; my $scriptname; my $action; my $force = 0; while($#args >= 0 && ($_ = $args[0]) =~ /^-/) { shift @args; if (/^-f$/) { $force = 1; next } if (/^-h|--help$/) { usage(); } usage("unknown option"); } usage("not enough arguments") if ($#args < 1); my @sequence = create_sequence($force); $scriptname = shift @args; $action = shift @args; if ("remove" eq $action) { foreach my $init (@sequence) { $init->{remove}->($scriptname); } } elsif ("defaults" eq $action || "start" eq $action || "stop" eq $action) { # All start/stop/defaults arguments are discarded so emit a # message if arguments have been given and are in conflict # with Default-Start/Default-Stop values of LSB comment. if ("start" eq $action || "stop" eq $action) { cmp_args_with_defaults($scriptname, $action, @args); } foreach my $init (@sequence) { $init->{defaults}->($scriptname); } } elsif ("defaults-disabled" eq $action) { foreach my $init (@sequence) { $init->{defaults_disabled}->($scriptname); } } elsif ("disable" eq $action || "enable" eq $action) { foreach my $init (@sequence) { $init->{toggle}->($action, $scriptname, @args); } } else { usage(); } } sub parse_def_start_stop { my $script = shift; my (%lsb, @def_start_lvls, @def_stop_lvls); open my $fh, '<', $script or error("unable to read $script"); while (<$fh>) { chomp; if (m/^### BEGIN INIT INFO\s*$/) { $lsb{'begin'}++; } elsif (m/^### END INIT INFO\s*$/) { $lsb{'end'}++; last; } elsif ($lsb{'begin'} and not $lsb{'end'}) { if (m/^# Default-Start:\s*(\S?.*)$/) { @def_start_lvls = split(' ', $1); } if (m/^# Default-Stop:\s*(\S?.*)$/) { @def_stop_lvls = split(' ', $1); } } } close($fh); return (\@def_start_lvls, \@def_stop_lvls); } sub lsb_header_for_script { my $name = shift; foreach my $file ("/etc/insserv/overrides/$name", "/etc/init.d/$name", "/usr/share/insserv/overrides/$name") { return $file if -s $file; } error("cannot find a LSB script for $name"); } sub cmp_args_with_defaults { my ($name, $act) = (shift, shift); my ($lsb_start_ref, $lsb_stop_ref, $arg_str, $lsb_str); my (@arg_start_lvls, @arg_stop_lvls, @lsb_start_lvls, @lsb_stop_lvls); ($lsb_start_ref, $lsb_stop_ref) = parse_def_start_stop("/etc/init.d/$name"); @lsb_start_lvls = @$lsb_start_ref; @lsb_stop_lvls = @$lsb_stop_ref; return if (!@lsb_start_lvls and !@lsb_stop_lvls); warning "start and stop actions are no longer supported; falling back to defaults"; my $start = $act eq 'start' ? 1 : 0; my $stop = $act eq 'stop' ? 1 : 0; # The legacy part of this program passes arguments starting with # "start|stop NN x y z ." but the insserv part gives argument list # starting with sequence number (ie. strips off leading "start|stop") # Start processing arguments immediately after the first seq number. my $argi = $_[0] eq $act ? 2 : 1; while (defined $_[$argi]) { my $arg = $_[$argi]; # Runlevels 0 and 6 are always stop runlevels if ($arg eq 0 or $arg eq 6) { $start = 0; $stop = 1; } elsif ($arg eq 'start') { $start = 1; $stop = 0; $argi++; next; } elsif ($arg eq 'stop') { $start = 0; $stop = 1; $argi++; next; } elsif ($arg eq '.') { next; } push(@arg_start_lvls, $arg) if $start; push(@arg_stop_lvls, $arg) if $stop; } continue { $argi++; } if ($#arg_start_lvls != $#lsb_start_lvls or join("\0", sort @arg_start_lvls) ne join("\0", sort @lsb_start_lvls)) { $arg_str = @arg_start_lvls ? "@arg_start_lvls" : "none"; $lsb_str = @lsb_start_lvls ? "@lsb_start_lvls" : "none"; warning "start runlevel arguments ($arg_str) do not match", "$name Default-Start values ($lsb_str)"; } if ($#arg_stop_lvls != $#lsb_stop_lvls or join("\0", sort @arg_stop_lvls) ne join("\0", sort @lsb_stop_lvls)) { $arg_str = @arg_stop_lvls ? "@arg_stop_lvls" : "none"; $lsb_str = @lsb_stop_lvls ? "@lsb_stop_lvls" : "none"; warning "stop runlevel arguments ($arg_str) do not match", "$name Default-Stop values ($lsb_str)"; } } sub sysv_toggle { my ($act, $name) = (shift, shift); my (@toggle_lvls, $start_lvls, $stop_lvls, @symlinks); my $lsb_header = lsb_header_for_script($name); # Extra arguments to disable|enable action are runlevels. If none # given parse LSB info for Default-Start value. if ($#_ >= 0) { @toggle_lvls = @_; } else { ($start_lvls, $stop_lvls) = parse_def_start_stop($lsb_header); @toggle_lvls = @$start_lvls; if ($#toggle_lvls < 0) { error("$name Default-Start contains no runlevels, aborting."); } } # Find symlinks in rc.d directories. Refuse to modify links in runlevels # not used for normal system start sequence. for my $lvl (@toggle_lvls) { if ($lvl !~ /^[S2345]$/) { warning("$act action will have no effect on runlevel $lvl"); next; } push(@symlinks, $_) for glob("/etc/rc$lvl.d/[SK][0-9][0-9]$name"); } if (!@symlinks) { error("no runlevel symlinks to modify, aborting!"); } # Toggle S/K bit of script symlink. for my $cur_lnk (@symlinks) { my $sk; my @new_lnk = split(//, $cur_lnk); if ("disable" eq $act) { $sk = rindex($cur_lnk, '/S') + 1; next if $sk < 1; $new_lnk[$sk] = 'K'; } else { $sk = rindex($cur_lnk, '/K') + 1; next if $sk < 1; $new_lnk[$sk] = 'S'; } rename($cur_lnk, join('', @new_lnk)) or error($!); } } # Try to determine if initscripts is installed sub is_initscripts_installed { # Check if mountkernfs is available. We cannot make inferences # using the running init system because we may be running in a # chroot return glob('/etc/rcS.d/S??mountkernfs.sh'); }