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|
#! /usr/bin/perl
#
# update-rc.d Update the links in /etc/rc[0-9S].d/
#
# Version: @(#)update-rc.d.pl 2.02 05-Mar-1998 miquels@cistron.nl
#
$initd = "/etc/init.d";
$etcd = "/etc/rc";
$notreally = 0;
# Print usage message and die.
sub usage {
print STDERR "update-rc.d: error: @_\n" if ($#_ >= 0);
print STDERR <<EOF;
usage: update-rc.d [-n] [-f] <basename> remove
update-rc.d [-n] <basename> defaults [NN | sNN kNN]
update-rc.d [-n] <basename> start|stop NN runlvl [runlvl] [...] .
-n: not really
-f: force
EOF
exit (1);
}
# Check out options.
while($#ARGV >= 0 && ($_ = $ARGV[0]) =~ /^-/) {
shift @ARGV;
if (/^-n$/) { $notreally++; next }
if (/^-f$/) { $force++; next }
if (/^-h|--help$/) { &usage; }
&usage("unknown option");
}
# Action.
&usage() if ($#ARGV < 1);
$bn = shift @ARGV;
if ($ARGV[0] ne 'remove') {
if (! -f "$initd/$bn") {
print STDERR "update-rc.d: $initd/$bn: file does not exist\n";
exit (1);
}
} elsif (-f "$initd/$bn") {
if (!$force) {
printf STDERR "update-rc.d: $initd/$bn exists during rc.d purge (use -f to force)\n";
exit (1);
} else {
printf STDERR "update-rc.d: $initd/$bn exists during rc.d purge (continuing)\n";
}
}
$_ = $ARGV[0];
if (/^remove$/) { &checklinks ("remove"); }
elsif (/^defaults$/) { &defaults; &makelinks }
elsif (/^(start|stop)$/) { &startstop; &makelinks; }
else { &usage; }
exit (0);
# Check if there are links in /etc/rc[0-9S].d/
# Remove if the first argument is "remove" and the links
# point to $bn.
sub is_link () {
my ($op, $fn, $bn) = @_;
if (! -l $fn) {
print STDERR "update-rc.d: warning: $fn is not a symbolic link\n";
return 0;
} else {
$linkdst = readlink ($fn);
if (! defined $linkdst) {
die ("update-rc.d: error reading symbolic link: $!\n");
}
if (($linkdst ne "../init.d/$bn") && ($linkdst ne "../init.d/$bn")) {
print STDERR "update-rc.d: warning: $fn is not a link to ../init.d/$bn\n";
return 0;
}
}
return 1;
}
sub checklinks {
my ($i, $found, $fn, $islnk);
print " Removing any system startup links for $initd/$bn ...\n"
if ($_[0] eq 'remove');
$found = 0;
foreach $i (0..9, 'S') {
unless (chdir ("$etcd$i.d")) {
next if ($i =~ m/^[789S]$/);
die("update-rc.d: chdir $etcd$i.d: $!\n");
}
opendir(DIR, ".");
foreach $_ (readdir(DIR)) {
next unless (/^[SK]\d\d$bn$/);
$fn = "$etcd$i.d/$_";
$found = 1;
$islnk = &is_link ($_[0], $fn, $bn);
next if ($_[0] ne 'remove');
if (! $islnk) {
print " $fn is not a link to ../init.d/$bn; not removing\n";
next;
}
print " $etcd$i.d/$_\n";
next if ($notreally);
unlink ("$etcd$i.d/$_") ||
die("update-rc.d: unlink: $!\n");
}
closedir(DIR);
}
$found;
}
# Process the arguments after the "defaults" keyword.
sub defaults {
my ($start, $stop) = (20, 20);
&usage ("defaults takes only one or two codenumbers") if ($#ARGV > 2);
$start = $stop = $ARGV[1] if ($#ARGV >= 1);
$stop = $ARGV[2] if ($#ARGV >= 2);
&usage ("codenumber must be a number between 0 and 99")
if ($start !~ /^\d\d?$/ || $stop !~ /^\d\d?$/);
$start = sprintf("%02d", $start);
$stop = sprintf("%02d", $stop);
$stoplinks[0] = $stoplinks[1] = $stoplinks[6] = "K$stop";
$startlinks[2] = $startlinks[3] =
$startlinks[4] = $startlinks[5] = "S$start";
1;
}
# Process the arguments after the start or stop keyword.
sub startstop {
my($letter, $NN, $level);
while ($#ARGV >= 0) {
if ($ARGV[0] eq 'start') { $letter = 'S'; }
elsif ($ARGV[0] eq 'stop') { $letter = 'K' }
else {
&usage("expected start|stop");
}
if ($ARGV[1] !~ /^\d\d?$/) {
&usage("expected NN after $ARGV[0]");
}
$NN = sprintf("%02d", $ARGV[1]);
shift @ARGV; shift @ARGV;
$level = shift @ARGV;
do {
if ($level !~ m/^[0-9S]$/) {
&usage(
"expected runlevel [0-9S] (did you forget \".\" ?)");
}
if (! -d "$etcd$level.d") {
print STDERR
"update-rc.d: $etcd$level.d: no such directory\n";
exit(1);
}
$level = 99 if ($level eq 'S');
$startlinks[$level] = "$letter$NN" if ($letter eq 'S');
$stoplinks[$level] = "$letter$NN" if ($letter eq 'K');
} while (($level = shift @ARGV) ne '.');
&usage("action with list of runlevels not terminated by \`.'")
if ($level ne '.');
}
1;
}
# Create the links.
sub makelinks {
my($t, $i);
my @links;
if (&checklinks) {
print " System startup links for $initd/$bn already exist.\n";
exit (0);
}
print " Adding system startup for $initd/$bn ...\n";
# nice unreadable perl mess :)
for($t = 0; $t < 2; $t++) {
@links = $t ? @startlinks : @stoplinks;
for($i = 0; $i <= $#links; $i++) {
$lvl = $i;
$lvl = 'S' if ($i == 99);
next if ($links[$i] eq '');
print " $etcd$lvl.d/$links[$i]$bn -> ../init.d/$bn\n";
next if ($notreally);
symlink("../init.d/$bn", "$etcd$lvl.d/$links[$i]$bn")
|| die("update-rc.d: symlink: $!\n");
}
}
1;
}
|
