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#! /usr/bin/perl
# -*- Mode: Perl -*-
# image.postrm ---
# Author : Manoj Srivastava ( srivasta@glaurung.green-gryphon.com )
# Created On : Sat May 15 11:05:13 1999
# Created On Node : glaurung.green-gryphon.com
# Last Modified By : Manoj Srivastava
# Last Modified On : Fri Apr 12 14:43:25 2002
# Last Machine Used: glaurung.green-gryphon.com
# Update Count : 25
# Status : Unknown, Use with caution!
# HISTORY :
# Description :
#
# $Id: image.postrm,v 1.20 2002/04/12 20:03:33 srivasta Exp $
#
#
#use strict; #for debugging
$|=1;
# Predefined values:
my $version = "=V";
my $image_in_boot = "=B"; # Should be empty, mostly
my $no_symlink = "=S"; # Should be empty, mostly
my $reverse_symlink = "=R"; # Should be empty, mostly
my $do_symlink = "Yes"; # target machine defined
my $do_boot_enable = "Yes"; # target machine defined
my $do_bootfloppy = "Yes"; # target machine defined
my $do_bootloader = "Yes"; # target machine defined
my $move_image = ''; # target machine defined
my $kimage = "=K"; # Should be empty, mostly
my $loader = "=L"; # lilo, silo, quik, palo, vmelilo, or nettrom
my $image_dir = "=D"; # where the image is located
my $clobber_modules = ''; # target machine defined
my $initrd = "=I"; # initrd kernel
my $do_initrd = ''; # Normally, we don't
my $use_hard_links = ''; # hardlinks do not work across fs boundaries
my $postinst_hook = ''; #Normally we do not
my $postrm_hook = ''; #Normally we do not
my $preinst_hook = ''; #Normally we do not
my $prerm_hook = ''; #Normally we do not
my $minimal_swap = ''; # Do not swap symlinks
my $Loader = "NoLOADER"; #
$Loader = "LILO" if $loader =~ /^lilo/io;
$Loader = "SILO" if $loader =~ /^silo/io;
$Loader = "QUIK" if $loader =~ /^quik/io;
$Loader = "yaboot" if $loader =~ /^yaboot/io;
$Loader = "PALO" if $loader =~ /^palo/io;
$Loader = "NETTROM" if $loader =~ /^nettrom/io;
$Loader = "VMELILO" if $loader =~ /^vmelilo/io;
$Loader = "ZIPL" if $loader =~ /^zipl/io;
$Loader = "ELILO" if $loader =~ /^elilo/io;
# This should not point to /tmp, because of security risks.
my $temp_file_name = "/var/log/$loader" . "_log.$$";
#known variables
my @boilerplate = ();
my @silotemplate = ();
my @quiktemplate = ();
my @palotemplate = ();
my @vmelilotemplate = ();
my $bootdevice = '';
my $rootdevice = '';
my $rootdisk = '';
my $rootpartition = '';
my $image_dest = "/";
my $realimageloc = "/$image_dir/";
my $have_conffile = "";
my $CONF_LOC = '/etc/kernel-img.conf';
my $relative_links = '';
my $silent_modules = '';
my $silent_loader = '';
# remove multiple leading slashes; make sure there is at least one.
$realimageloc =~ s|^/*|/|o;
$realimageloc =~ s|/+|/|o;
# most of our work is done in $image_dir
chdir("$image_dir") or die "could not chdir to $image_dir:$!\n";
if (-r "$CONF_LOC" && -f "$CONF_LOC" ) {
if (open(CONF, "$CONF_LOC")) {
while (<CONF>) {
chomp;
s/\#.*$//g;
next if /^\s*$/;
$do_symlink = "" if /do_symlinks\s*=\s*(no|false|0)\s*$/ig;
$no_symlink = "" if /no_symlinks\s*=\s*(no|false|0)\s*$/ig;
$reverse_symlink = "" if /reverse_symlinks\s*=\s*(no|false|0)\s*$/ig;
$image_in_boot = "" if /image_in_boot\s*=\s*(no|false|0)\s*$/ig;
$move_image = "" if /move_image\s*=\s*(no|false|0)\s*$/ig;
$clobber_modules = '' if /clobber_modules\s*=\s*(no|false|0)\s*$/ig;
$do_boot_enable = '' if /do_boot_enable\s*=\s*(no|false|0)\s*$/ig;
$do_bootfloppy = '' if /do_bootfloppy\s*=\s*(no|false|0)\s*$/ig;
$relative_links = '' if /relative_links \s*=\s*(no|false|0)\s*$/ig;
$do_bootloader = '' if /do_bootloader\s*=\s*(no|false|0)\s*$/ig;
$do_initrd = '' if /do_initrd\s*=\s*(no|false|0)\s*$/ig;
$use_hard_links = '' if /use_hard_links\s*=\s*(no|false|0)\s*$/ig;
$silent_modules = '' if /silent_modules\s*=\s*(no|false|0)\s*$/ig;
$silent_loader = '' if /silent_loader\s*=\s*(no|false|0)\s*$/ig;
$minimal_swap = '' if /minimal_swap\s*=\s*(no|false|0)\s*$/ig;
$do_symlink = "Yes" if /do_symlinks\s*=\s*(yes|true|1)\s*$/ig;
$no_symlink = "Yes" if /no_symlinks\s*=\s*(yes|true|1)\s*$/ig;
$reverse_symlink = "Yes" if /reverse_symlinks\s*=\s*(yes|true|1)\s*$/ig;
$image_in_boot = "Yes" if /image_in_boot\s*=\s*(yes|true|1)\s*$/ig;
$move_image = "Yes" if /move_image\s*=\s*(yes|true|1)\s*$/ig;
$clobber_modules = "Yes" if /clobber_modules\s*=\s*(yes|true|1)\s*$/ig;
$do_boot_enable = "Yes" if /do_boot_enable\s*=\s*(yes|true|1)\s*$/ig;
$do_bootfloppy = "Yes" if /do_bootfloppy\s*=\s*(yes|true|1)\s*$/ig;
$do_bootloader = "Yes" if /do_bootloader\s*=\s*(yes|true|1)\s*$/ig;
$relative_links = "Yes" if /relative_links\s*=\s*(yes|true|1)\s*$/ig;
$do_initrd = "Yes" if /do_initrd\s*=\s*(yes|true|1)\s*$/ig;
$use_hard_links = "Yes" if /use_hard_links\s*=\s*(yes|true|1)\s*$/ig;
$silent_modules = 'Yes' if /silent_modules\s*=\s*(yes|true|1)\s*$/ig;
$silent_loader = 'Yes' if /silent_loader\s*=\s*(yes|true|1)\s*$/ig;
$minimal_swap = 'Yes' if /minimal_swap\s*=\s*(yes|true|1)\s*$/ig;
$image_dest = "$1" if /image_dest\s*=\s*(\S+)/ig;
$postinst_hook = "$1" if /postinst_hook\s*=\s*(\S+)/ig;
$postrm_hook = "$1" if /postrm_hook\s*=\s*(\S+)/ig;
$preinst_hook = "$1" if /preinst_hook\s*=\s*(\S+)/ig;
$prerm_hook = "$1" if /prerm_hook\s*=\s*(\S+)/ig;
}
close CONF;
$have_conffile = "Yes";
}
}
if ($image_in_boot) {$image_dest = "/$image_dir/"; $image_dest =~ s|^/*|/|o; }
# Paranoid check to make sure that the correct value is put in there
if (! $kimage) {$kimage = "vmlinuz"} # Hmm. empty
elsif ($kimage =~ m/^b?zImage$/o) {$kimage = "vmlinuz"} # these produce vmlinuz
elsif ($kimage =~ m/^[iI]mage$/o) { my $nop = $kimage;}
elsif ($kimage =~ m/^vmlinux$/o) { my $nop = $kimage;}
else {$kimage = "vmlinuz"} # default
######################################################################
######################################################################
############
######################################################################
######################################################################
sub remove_sym_link {
my $bad_image = $_[0];
warn "Removing symbolic link $bad_image \n";
warn "Unless you used the optional flag in lilo, you may \n";
warn " need to re-run $loader\n";
# Remove the dangling link
unlink "$bad_image";
}
######################################################################
######################################################################
############
######################################################################
######################################################################
sub CanonicalizePath {
my $path = join '/', @_;
my @work = split '/', $path;
my @out;
my $is_absolute;
if (@work && $work[0] eq "") { $is_absolute = 1; shift @work; }
while (@work) {
my $seg = shift @work;
if ($seg eq "." || $seg eq "") {
} elsif ($seg eq "..") {
if (@out && $out[-1] ne "..") {
pop @out;
} else {
# Leading "..", or "../..", etc.
push @out, $seg;
}
} else {
push @out, $seg;
}
}
unshift @out, "" if $is_absolute;
return join('/', @out);
}
######################################################################
######################################################################
############
######################################################################
######################################################################
# This removes dangling symlinks. What do we do about hard links? Surely a
# something with the nane $image_dest . "$kimage" ought not to be left behind?
sub image_magic {
my $kimage = $_[0];
my $image_dest = $_[1];
if (-l $image_dest . "$kimage") {
# There is a symbolic link
my $force_move = 0;
my $vmlinuz_target = readlink $image_dest . "$kimage";
if (!defined($vmlinuz_target)) {
# what, a dangling symlink?
warn "The link " . $image_dest . "$kimage is a damaged link\n";
# Remove the dangling link
&remove_sym_link("$image_dest" . "$kimage");
}
else {
my $canonical_target = CanonicalizePath("$image_dest" .
"$vmlinuz_target");
if (! -e $canonical_target) {
warn "The link " . $image_dest . "$kimage is a dangling link\n";
&remove_sym_link("$image_dest" . "$kimage");
}
}
}
}
## Run user hook script here, if any
if (-x "$postrm_hook") {
system ("$postrm_hook", $version, $realimageloc . "$kimage-$version") &&
warn "User hook script $postrm_hook failed";
}
# Ignore all invocations uxcept when called on to purge.
exit 0 unless $ARGV[0] =~ /purge/;
# check and remove damaged and dangling symlinks
image_magic($kimage, $image_dest);
image_magic($kimage . ".old", $image_dest);
image_magic("initrd.img", $realimageloc) if $initrd;
image_magic("initrd.img.old", $realimageloc) if $initrd;
if (-f "/lib/modules/$version/modules.dep") {
unlink "/lib/modules/$version/modules.dep";
}
if (-f "/lib/modules/$version/modules.isapnpmap") {
unlink "/lib/modules/$version/modules.isapnpmap";
}
if (-f "/lib/modules/$version/modules.pcimap") {
unlink "/lib/modules/$version/modules.pcimap";
}
if (-f "/lib/modules/$version/modules.usbmap") {
unlink "/lib/modules/$version/modules.usbmap";
}
if (-f $realimageloc . "initrd.img-$version") {
unlink $realimageloc . "initrd.img-$version";
}
if (-f "/lib/modules/$version/modules.parportmap") {
unlink "/lib/modules/$version/modules.parportmap";
}
if (-f "/lib/modules/$version/modules.generic_string") {
unlink "/lib/modules/$version/modules.generic_string";
}
if (-f "/lib/modules/$version/modules.ieee1394map") {
unlink "/lib/modules/$version/modules.ieee1394map";
}
if (-d "/lib/modules/$version" ) {
system ("rmdir", "/lib/modules/$version");
}
exit 0;
__END__
|
