398 lines
14 KiB
Perl
398 lines
14 KiB
Perl
#! /usr/bin/perl
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# -*- Mode: Cperl -*-
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# image.postrm ---
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# Author : Manoj Srivastava ( srivasta@glaurung.green-gryphon.com )
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# Created On : Sat May 15 11:05:13 1999
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# Created On Node : glaurung.green-gryphon.com
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# Last Modified By : Manoj Srivastava
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# Last Modified On : Wed Sep 13 11:26:19 2006
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# Last Machine Used: glaurung.internal.golden-gryphon.com
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# Update Count : 57
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# Status : Unknown, Use with caution!
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# HISTORY :
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# Description :
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#
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# $Id: image.postrm,v 1.31 2003/10/07 16:24:20 srivasta Exp $
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#
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#
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#use strict; #for debugging
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use Cwd 'abs_path';
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# Debconf may not be around here.
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my $have_debconf = 0;
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my $capb;
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eval {require Debconf::Client::ConfModule;};
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if ( ! $@ )
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{
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$have_debconf++;
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import Debconf::Client::ConfModule ':all';
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version('2.0');
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$capb=capb("backup");
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}
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$|=1;
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# Predefined values:
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my $version = "xxKERNELRELEASExx";
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my $link_in_boot = ""; # Should be empty, mostly
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my $no_symlink = ""; # Should be empty, mostly
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my $reverse_symlink = ""; # Should be empty, mostly
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my $do_symlink = "Yes"; # target machine defined
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my $do_boot_enable = "Yes"; # target machine defined
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my $do_bootfloppy = "Yes"; # target machine defined
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my $do_bootloader = "Yes"; # target machine defined
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my $move_image = ''; # target machine defined
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my $kimage = ""; # Should be empty, mostly
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my $loader = "lilo"; # lilo, silo, quik, palo, vmelilo, or nettrom
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my $image_dir = "/boot"; # where the image is located
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my $clobber_modules = ''; # target machine defined
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my $initrd = "YES"; # initrd kernel
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my $mkimage = ""; # command to generate the initrd image
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my $do_initrd = ''; # Normally, we don't
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my $warn_initrd = 'YES'; # Normally we do
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my $use_hard_links = ''; # hardlinks do not work across fs boundaries
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my $postinst_hook = ''; #Normally we do not
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my $postrm_hook = ''; #Normally we do not
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my $preinst_hook = ''; #Normally we do not
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my $prerm_hook = ''; #Normally we do not
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my $minimal_swap = ''; # Do not swap symlinks
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my $ignore_depmod_err = ''; # normally we do not
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my $relink_build_link = 'YES'; # There is no harm in checking the link
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my $force_build_link = ''; # we shall not create a dangling link
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my $official_image = "YES"; # only true for official images
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my $arch = "i386"; # should be same as dpkg --print-installation-architecture
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my $kernel_arch = "x86";
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my $ramdisk = "mkinitramfs-kpkg mkinitrd.yaird"; # List of tools to create initial ram fs.
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my $initrddep = "D"; # List of dependencies for such tools
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#my $package_name = "linux-image-686-$version";
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my $package_name = "xxPACKAGE_NAMExx";
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my $Loader = "NoLOADER"; #
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$Loader = "LILO" if $loader =~ /^lilo/io;
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$Loader = "SILO" if $loader =~ /^silo/io;
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$Loader = "QUIK" if $loader =~ /^quik/io;
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$Loader = "yaboot" if $loader =~ /^yaboot/io;
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$Loader = "PALO" if $loader =~ /^palo/io;
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$Loader = "NETTROM" if $loader =~ /^nettrom/io;
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$Loader = "VMELILO" if $loader =~ /^vmelilo/io;
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$Loader = "ZIPL" if $loader =~ /^zipl/io;
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$Loader = "ELILO" if $loader =~ /^elilo/io;
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# This should not point to /tmp, because of security risks.
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my $temp_file_name = "/var/log/$loader" . "_log.$$";
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#known variables
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my @boilerplate = ();
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my @silotemplate = ();
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my @quiktemplate = ();
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my @palotemplate = ();
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my @vmelilotemplate = ();
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my $bootdevice = '';
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my $rootdevice = '';
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my $rootdisk = '';
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my $rootpartition = '';
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my $image_dest = "/";
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my $realimageloc = "/$image_dir/";
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my $have_conffile = "";
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my $CONF_LOC = '/etc/kernel-img.conf';
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my $relative_links = '';
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my $silent_modules = '';
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my $silent_loader = '';
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chdir('/') or die "could not chdir to /:$!\n";
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# remove multiple leading slashes; make sure there is at least one.
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$realimageloc =~ s|^/*|/|o;
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$realimageloc =~ s|/+|/|o;
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if (-r "$CONF_LOC" && -f "$CONF_LOC" ) {
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if (open(CONF, "$CONF_LOC")) {
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while (<CONF>) {
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chomp;
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s/\#.*$//g;
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next if /^\s*$/;
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$do_symlink = "" if /do_symlinks\s*=\s*(no|false|0)\s*$/ig;
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$no_symlink = "" if /no_symlinks\s*=\s*(no|false|0)\s*$/ig;
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$reverse_symlink = "" if /reverse_symlinks\s*=\s*(no|false|0)\s*$/ig;
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$link_in_boot = "" if /link_in_boot\s*=\s*(no|false|0)\s*$/ig;
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$move_image = "" if /move_image\s*=\s*(no|false|0)\s*$/ig;
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$clobber_modules = '' if /clobber_modules\s*=\s*(no|false|0)\s*$/ig;
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$do_boot_enable = '' if /do_boot_enable\s*=\s*(no|false|0)\s*$/ig;
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$do_bootfloppy = '' if /do_bootfloppy\s*=\s*(no|false|0)\s*$/ig;
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$relative_links = '' if /relative_links \s*=\s*(no|false|0)\s*$/ig;
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$do_bootloader = '' if /do_bootloader\s*=\s*(no|false|0)\s*$/ig;
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$do_initrd = '' if /do_initrd\s*=\s*(no|false|0)\s*$/ig;
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$warn_initrd = '' if /warn_initrd\s*=\s*(no|false|0)\s*$/ig;
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$use_hard_links = '' if /use_hard_links\s*=\s*(no|false|0)\s*$/ig;
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$silent_modules = '' if /silent_modules\s*=\s*(no|false|0)\s*$/ig;
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$silent_loader = '' if /silent_loader\s*=\s*(no|false|0)\s*$/ig;
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$minimal_swap = '' if /minimal_swap\s*=\s*(no|false|0)\s*$/ig;
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$ignore_depmod_err = '' if /ignore_depmod_err\s*=\s*(no|false|0)\s*$/ig;
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$relink_build_link = '' if /relink_build_link\s*=\s*(no|false|0)\s*$/ig;
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$force_build_link = '' if /force_build_link\s*=\s*(no|false|0)\s*$/ig;
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$do_symlink = "Yes" if /do_symlinks\s*=\s*(yes|true|1)\s*$/ig;
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$no_symlink = "Yes" if /no_symlinks\s*=\s*(yes|true|1)\s*$/ig;
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$reverse_symlink = "Yes" if /reverse_symlinks\s*=\s*(yes|true|1)\s*$/ig;
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$link_in_boot = "Yes" if /link_in_boot\s*=\s*(yes|true|1)\s*$/ig;
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$move_image = "Yes" if /move_image\s*=\s*(yes|true|1)\s*$/ig;
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$clobber_modules = "Yes" if /clobber_modules\s*=\s*(yes|true|1)\s*$/ig;
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$do_boot_enable = "Yes" if /do_boot_enable\s*=\s*(yes|true|1)\s*$/ig;
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$do_bootfloppy = "Yes" if /do_bootfloppy\s*=\s*(yes|true|1)\s*$/ig;
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$do_bootloader = "Yes" if /do_bootloader\s*=\s*(yes|true|1)\s*$/ig;
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$relative_links = "Yes" if /relative_links\s*=\s*(yes|true|1)\s*$/ig;
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$do_initrd = "Yes" if /do_initrd\s*=\s*(yes|true|1)\s*$/ig;
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$warn_initrd = "Yes" if /warn_initrd\s*=\s*(yes|true|1)\s*$/ig;
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$use_hard_links = "Yes" if /use_hard_links\s*=\s*(yes|true|1)\s*$/ig;
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$silent_modules = 'Yes' if /silent_modules\s*=\s*(yes|true|1)\s*$/ig;
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$silent_loader = 'Yes' if /silent_loader\s*=\s*(yes|true|1)\s*$/ig;
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$minimal_swap = 'Yes' if /minimal_swap\s*=\s*(yes|true|1)\s*$/ig;
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$ignore_depmod_err = 'Yes' if /ignore_depmod_err\s*=\s*(yes|true|1)\s*$/ig;
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$relink_build_link = 'Yes' if /relink_build_link\s*=\s*(yes|true|1)\s*$/ig;
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$force_build_link = 'Yes' if /force_build_link\s*=\s*(yes|true|1)\s*$/ig;
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$image_dest = "$1" if /image_dest\s*=\s*(\S+)/ig;
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$postinst_hook = "$1" if /postinst_hook\s*=\s*(\S+)/ig;
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$postrm_hook = "$1" if /postrm_hook\s*=\s*(\S+)/ig;
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$preinst_hook = "$1" if /preinst_hook\s*=\s*(\S+)/ig;
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$prerm_hook = "$1" if /prerm_hook\s*=\s*(\S+)/ig;
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$mkimage = "$1" if /mkimage\s*=\s*(.+)$/ig;
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$ramdisk = "$1" if /ramdisk\s*=\s*(.+)$/ig;
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}
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close CONF;
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$have_conffile = "Yes";
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}
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}
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if ($link_in_boot) {
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$image_dest = "/$image_dir/";
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$image_dest =~ s|^/*|/|o;
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}
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$image_dest = "$image_dest/";
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$image_dest =~ s|/+$|/|o;
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# The destdir may be gone by now.
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if (-d "$image_dest") {
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chdir("$image_dest") or die "could not chdir to $image_dest:$!\n";
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}
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# Paranoid check to make sure that the correct value is put in there
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if (! $kimage) {$kimage = "vmlinuz"} # Hmm. empty
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elsif ($kimage =~ m/^b?zImage$/o) {$kimage = "vmlinuz"} # these produce vmlinuz
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elsif ($kimage =~ m/^[iI]mage$/o) { my $nop = $kimage;}
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elsif ($kimage =~ m/^vmlinux$/o) { my $nop = $kimage;}
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else {$kimage = "vmlinuz"} # default
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$ENV{KERNEL_ARCH}=$kernel_arch if $kernel_arch;
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######################################################################
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######################################################################
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############
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######################################################################
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######################################################################
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sub remove_sym_link {
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my $bad_image = $_[0];
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warn "Removing symbolic link $bad_image \n";
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if ($loader =~ /lilo/i)
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{
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warn "Unless you used the optional flag in lilo, \n";
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}
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warn " you may need to re-run your boot loader" . ($loader ? "[$loader]":"")
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. "\n";
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# Remove the dangling link
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unlink "$bad_image";
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}
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######################################################################
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######################################################################
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############
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######################################################################
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######################################################################
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sub CanonicalizePath {
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my $path = join '/', @_;
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my @work = split '/', $path;
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my @out;
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my $is_absolute;
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if (@work && $work[0] eq "") { $is_absolute = 1; shift @work; }
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while (@work) {
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my $seg = shift @work;
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if ($seg eq "." || $seg eq "") {
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} elsif ($seg eq "..") {
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if (@out && $out[-1] ne "..") {
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pop @out;
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} else {
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# Leading "..", or "../..", etc.
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push @out, $seg;
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}
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} else {
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push @out, $seg;
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}
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}
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unshift @out, "" if $is_absolute;
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return join('/', @out);
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}
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######################################################################
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######################################################################
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############
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######################################################################
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######################################################################
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# This removes dangling symlinks. What do we do about hard links? Surely a
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# something with the nane $image_dest . "$kimage" ought not to be left behind?
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sub image_magic {
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my $kimage = $_[0];
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my $image_dest = $_[1];
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if (-l "$kimage") {
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# There is a symbolic link
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my $force_move = 0;
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my $vmlinuz_target = readlink "$kimage";
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my $real_target = '';
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$real_target = abs_path($vmlinuz_target) if defined ($vmlinuz_target);
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if (!defined($vmlinuz_target) || ! -f "$real_target") {
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# what, a dangling symlink?
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warn "The link " . $image_dest . "$kimage is a damaged link\n";
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# Remove the dangling link
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&remove_sym_link("$kimage");
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}
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else {
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my $canonical_target = CanonicalizePath("$vmlinuz_target");
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if (! -e $canonical_target) {
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warn "The link " . $image_dest . "$kimage is a dangling link\n";
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&remove_sym_link("$kimage");
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}
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}
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}
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}
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# set the env var stem
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$ENV{'STEM'} = "linux";
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sub exec_script {
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my $type = shift;
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my $script = shift;
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print STDERR "Running $type hook script $script.\n";
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system ("$script $version $realimageloc$kimage-$version") &&
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print STDERR "User $type hook script [$script] ";
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if ($?) {
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if ($? == -1) {
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print STDERR "failed to execute: $!\n";
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}
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elsif ($? & 127) {
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printf STDERR "died with signal %d, %s coredump\n",
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($? & 127), ($? & 128) ? 'with' : 'without';
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}
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else {
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printf STDERR "exited with value %d\n", $? >> 8;
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}
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}
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}
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sub run_hook {
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my $type = shift;
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my $script = shift;
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if ($script =~ m,^/,) {
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# Full path provided for the hook script
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if (-x "$script") {
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&exec_script($type,$script);
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}
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else {
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warn "The provided $type hook script [$script] could not be run.\n";
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}
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}
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else {
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# Look for it in a safe path
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for my $path ('/bin', '/sbin', '/usr/bin', '/usr/sbin') {
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if (-x "$path/$script") {
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&exec_script($type, "$path/$script");
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return 0;
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}
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}
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# No luck
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print STDERR "Could not find $type hook script [$script].\n";
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warn "Looked in: '/bin', '/sbin', '/usr/bin', '/usr/sbin'\n";
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}
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}
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## Run user hook script here, if any
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if ($postrm_hook) {
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&run_hook("postrm", $postrm_hook);
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}
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if (-d "/etc/kernel/postrm.d") {
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warn "Examining /etc/kernel/postrm.d .\n";
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system ("run-parts --verbose --exit-on-error --arg=$version " .
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"--arg=$realimageloc$kimage-$version " .
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"/etc/kernel/postrm.d") &&
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die "Failed to process /etc/kernel/postrm.d";
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}
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if (-d "/etc/kernel/postrm.d/$version") {
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warn "Examining /etc/kernel/postrm.d/$version .\n";
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system ("run-parts --verbose --exit-on-error --arg=$version " .
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"--arg=$realimageloc$kimage-$version " .
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"/etc/kernel/postrm.d/$version") &&
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die "Failed to process /etc/kernel/postrm.d/$version";
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}
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# purge initramfs and related
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if ($ARGV[0] !~ /upgrade/) {
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if (-f $realimageloc . "initrd.img-$version") {
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unlink $realimageloc . "initrd.img-$version";
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}
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if (-f $realimageloc . "initrd.img-$version.bak") {
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unlink $realimageloc . "initrd.img-$version.bak";
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}
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if (-f "/var/lib/initramfs-tools/$version") {
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unlink "/var/lib/initramfs-tools/$version";
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}
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# check and remove damaged and dangling symlinks
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image_magic($kimage, $image_dest);
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image_magic($kimage . ".old", $image_dest);
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image_magic("initrd.img", $image_dest) if $initrd;
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image_magic("initrd.img.old", $image_dest) if $initrd;
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}
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# Ignore all invocations except when called on to purge.
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exit 0 unless $ARGV[0] =~ /purge/;
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my $ret = purge();
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my @files_to_remove = qw{
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modules.dep modules.isapnpmap modules.pcimap
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modules.usbmap modules.parportmap
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modules.generic_string modules.ieee1394map
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modules.ieee1394map modules.pnpbiosmap
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modules.alias modules.ccwmap modules.inputmap
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modules.symbols build source modules.ofmap
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modules.seriomap
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};
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foreach my $extra_file (@files_to_remove) {
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if (-f "/lib/modules/$version/$extra_file") {
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unlink "/lib/modules/$version/$extra_file";
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}
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}
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if (-d "/lib/modules/$version" ) {
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system ("rmdir", "/lib/modules/$version");
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}
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exit 0;
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__END__
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