287 lines
9.5 KiB
Perl
Executable File
287 lines
9.5 KiB
Perl
Executable File
#! /usr/bin/perl
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#
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#use strict;
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use Debconf::Client::ConfModule qw(:all);
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version('2.0');
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my $capb=capb("backup");
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$|=1;
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# Predefined values:
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my $version = "=V";
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my $link_in_boot = "=IB"; # Should be empty, mostly
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my $no_symlink = "=S"; # Should be empty, mostly
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my $do_symlinks = "Yes"; # target machine defined
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my $do_boot_enable = "Yes"; # target machine defined
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my $do_bootloader = "Yes"; # target machine defined
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my $kimage = "=K"; # Should be empty, mostly
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my $loader = "=L"; # lilo, silo, quik, palo, vmelilo, or nettrom
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my $image_dir = "=D"; # where the image is located
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my $use_hard_links = ''; # hardlinks do not wirk across fs boundaries
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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 = ''; # There is no harm in checking the link
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my $arch = "=A"; # should be same as dpkg --print-architecture
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my $kernel_arch = "=B";
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my $package_name = "=ST-image-$version";
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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 $image_dest = "/";
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my $realimageloc = "/$image_dir/";
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my $CONF_LOC = '/etc/kernel-img.conf';
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# remove multiple leading slashes; make sure there is at least one.
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$realimageloc =~ s|^/*|/|o;
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$realimageloc =~ s|/+|/|o;
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# Variables used
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my $image='';
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my $ret=0;
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my $seen='';
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my $answer='';
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my $running = '';
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my $WouldInvalidate = 0;
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if ($ARGV[0] && ($ARGV[0] =~ /remove/ || $ARGV[0] =~ /upgrade/)) {
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if (-l "/usr/doc/=ST-image-$version") {
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unlink "/usr/doc/=ST-image-$version";
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}
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}
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# Ignore all invocations uxcept when called on to remove
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exit 0 unless ($ARGV[0] && $ARGV[0] =~ /remove/) ;
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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 { $kimage = "vmlinuz";} # Default
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if (-r "$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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$link_in_boot = "" if /link_in_boot\s*=\s*(no|false|0)\s*$/ig;
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$do_boot_enable = '' if /do_boot_enable\s*=\s*(no|false|0)\s*$/ig;
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$do_bootloader = '' if /do_bootloader\s*=\s*(no|false|0)\s*$/ig;
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$use_hard_links = '' if /use_hard_links\s*=\s*(no|false|0)\s*$/ig;
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$warn_reboot = '' if /warn_reboot\s*=\s*(no|false|0)\s*$/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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$link_in_boot = "Yes" if /link_in_boot\s*=\s*(yes|true|1)\s*$/ig;
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$do_boot_enable = "Yes" if /do_boot_enable\s*=\s*(yes|true|1)\s*$/ig;
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$do_bootloader = "Yes" if /do_bootloader\s*=\s*(yes|true|1)\s*$/ig;
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$use_hard_links = "Yes" if /use_hard_links\s*=\s*(yes|true|1)\s*$/ig;
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$warn_reboot = 'Yes' if /warn_reboot\s*=\s*(yes|true|1)\s*$/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 = "$1" if /image_dest\s*=\s*(\S+)/ig;
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$prerm_hook = "$1" if /prerm_hook\s*=\s*(\S+)/ig;
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}
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close CONF;
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}
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}
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$ENV{KERNEL_ARCH}=$kernel_arch if $kernel_arch;
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#check to see if we are trying to remove a running kernel
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# if so we abort right now.
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chop($running=`uname -r`);
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if ($running eq $version) {
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my $question = "${package_name}/prerm/removing-running-kernel-$version";
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($ret,$seen) = fset ("$question", 'seen', 'false');
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die "Error setting debconf flags in $question: $seen" if $ret;
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$ret = subst("$question", 'running', "$running");
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die "Error setting debconf substitutions in $question: $seen" if $ret;
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($ret,$seen) = input('critical', "$question");
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if ($ret && $ret != 30 ) {
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die "Error setting debconf question $question: $seen";
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}
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($ret,$seen) = go ();
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if ($ret && $ret != 30 ) {
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die "Error asking debconf question $question: $seen";
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}
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($ret,$answer) = get("$question");
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die "Error retreiving answer for $question: $answer" if $ret;
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if ($answer =~ /^(y|t)/i) {
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exit 1; #Operation not permitted
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}
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else {
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print STDERR "Ok, proceeding with removing running kernel image.\n";
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}
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}
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#Now, they have an alternate kernel which they are currently running
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# This is just us being nice to lilo users.
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chdir("/") or die "could not chdir to /:$!\n";
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if (-f "/etc/$loader.conf") { #I know, could be a link, but ..
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open (LILO, "/etc/$loader.conf"); # this is not critical
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while (<LILO>) {
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chop;
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s/\#.*//; # nix the comments
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next unless /^\s*image\s*=\s(\S+)/o;
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$image = $1;
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if ($image && -e $image) {
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while (defined($image) && -l $image) {
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$image = readlink ($image);
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}
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if (defined($image) && -e $image) {
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$WouldInvalidate |= $image =~ /$kimage-$version/;
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}
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else {
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last; # invalid $loader.conf file
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}
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}
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else {
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last; # invalid $loader.conf file
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}
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}
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close (LILO);
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if ($WouldInvalidate) {
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my $question = "${package_name}/prerm/would-invalidate-boot-loader-$version";
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($ret,$seen) = fset ("$question", 'seen', 'false');
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die "Error setting debconf flags in $question: $seen" if $ret;
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$ret = subst("$question", 'loader', "$loader");
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die "Error setting debconf substitutions in $question: $seen" if $ret;
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$ret = subst("$question", 'kimage', "$kimage");
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die "Error setting debconf substitutions in $question: $seen" if $ret;
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($ret,$seen) = input('critical', "$question");
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if ($ret && $ret != 30 ) {
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die "Error setting debconf question $question: $seen";
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}
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($ret,$seen) = go ();
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if ($ret && $ret != 30 ) {
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die "Error asking debconf question $question: $seen";
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}
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($ret,$answer) = get("$question");
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die "Error retreiving answer for $question: $answer" if $ret;
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if ($answer =~ /^(y|t)/i) {
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print STDERR "\nNot removing =ST-image-$version.\n";
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exit 1; #Operation not permitted
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}
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else {
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print STFERR "Ok, proceeding with removing running kernel image.\n";
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}
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}
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}
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# set the env var stem
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$ENV{'STEM'} = "=ST";
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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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exit $? >> 8;
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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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die "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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die "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 (-x "$prerm_hook") {
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&run_hook("prerm", $prerm_hook);
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}
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if (-d "/etc/kernel/prerm.d") {
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print STDERR "Examining /etc/kernel/prerm.d.\n";
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system ("run-parts --verbose --exit-on-error --arg=$version " .
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"--arg=$realimageloc$kimage-$version /etc/kernel/prerm.d") &&
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die "Failed to process /etc/kernel/prerm.d";
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}
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if (-d "/etc/kernel/prerm.d/$version") {
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print STDERR "Examining /etc/kernel/prerm.d/$version.\n";
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system ("run-parts --verbose --exit-on-error --arg=$version" .
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" --arg=$realimageloc$kimage-$version " .
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"/etc/kernel/prerm.d/$version") &&
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die "Failed to process /etc/kernel/prerm.d/$version";
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}
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exit 0;
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__END__
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