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| Current File : /var/lib/dpkg/info/linux-image-4.4.0-142-generic.postinst |
#! /usr/bin/perl
# OriginalAuthor : Manoj Srivastava ( srivasta@pilgrim.umass.edu )
#
# Customized for Ubuntu by: Ben Collins <bcollins@ubuntu.com>
#use strict; #for debugging
use Cwd 'abs_path';
$|=1;
# Predefined values:
my $version = "4.4.0-142-generic";
my $link_in_boot = ""; # Should be empty, mostly
my $no_symlink = ""; # Should be empty, mostly
my $reverse_symlink = ""; # 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 = "vmlinuz"; # Should be empty, mostly
my $loader = "grub"; # lilo, silo, quik, palo, vmelilo, nettrom, arcboot or delo
my $image_dir = "/boot"; # where the image is located
my $clobber_modules = ''; # target machine defined
my $relative_links = ""; # target machine defined
my $initrd = "YES"; # initrd kernel
my $do_initrd = ''; # Normally we do not
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 $ignore_depmod_err = ''; # normally we do not
my $kernel_arch = "x86_64";
my $ramdisk = "/usr/sbin/update-initramfs"; # List of tools to create initial ram fs.
my $notifier = "/usr/share/update-notifier/notify-reboot-required";
my $package_name = "linux-image-$version";
my $explicit_do_loader = 'Yes';
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;
$Loader = "ARCBOOT" if $loader =~ /^arcboot/io;
$Loader = "DELO" if $loader =~ /^delo/io;
# This should not point to /tmp, because of security risks.
my $temp_file_name = "/var/log/$loader" . "_log.$$";
#known variables
my $image_dest = "/";
my $realimageloc = "/$image_dir/";
my $have_conffile = "";
my $silent_modules = '';
my $silent_loader = '';
my $warn_reboot = 'Yes'; # Warn that we are installing a version of
# the kernel we are running
my $modules_base = '/lib/modules';
my $CONF_LOC = '/etc/kernel-img.conf';
# Ignore all invocations except when called on to configure.
exit 0 unless $ARGV[0] =~ /configure/;
my $DEBUG = 0;
# Do some preliminary sanity checks here to ensure we actually have an
# valid image dir
chdir('/') or die "could not chdir to /:$!\n";
die "Internal Error: ($image_dir) is not a directory!\n"
unless -d $image_dir;
# remove multiple leading slashes; make sure there is at least one.
$realimageloc =~ s|^/*|/|o;
$realimageloc =~ s|/+|/|o;
die "Internal Error: ($realimageloc) is not a directory!\n"
unless -d $realimageloc;
if (-r "$CONF_LOC" && -f "$CONF_LOC" ) {
if (open(CONF, "$CONF_LOC")) {
while (<CONF>) {
chomp;
s/\#.*$//g;
next if /^\s*$/;
$do_symlink = "" if /^\s*do_symlinks\s*=\s*(no|false|0)\s*$/ig;
$no_symlink = "" if /^\s*no_symlinks\s*=\s*(no|false|0)\s*$/ig;
$reverse_symlink = "" if /^\s*reverse_symlink\s*=\s*(no|false|0)\s*$/ig;
$link_in_boot = "" if /^\s*image_in_boot\s*=\s*(no|false|0)\s*$/ig;
$link_in_boot = "" if /^\s*link_in_boot\s*=\s*(no|false|0)\s*$/ig;
$move_image = "" if /^\s*move_image\s*=\s*(no|false|0)\s*$/ig;
$clobber_modules = '' if /^\s*clobber_modules\s*=\s*(no|false|0)\s*$/ig;
$do_boot_enable = '' if /^\s*do_boot_enable\s*=\s*(no|false|0)\s*$/ig;
$do_bootfloppy = '' if /^\s*do_bootfloppy\s*=\s*(no|false|0)\s*$/ig;
$relative_links = '' if /^\s*relative_links \s*=\s*(no|false|0)\s*$/ig;
$do_bootloader = '' if /^\s*do_bootloader\s*=\s*(no|false|0)\s*$/ig;
$explicit_do_loader = '' if /^\s*do_bootloader\s*=\s*(no|false|0)\s*$/ig;
$do_initrd = '' if /^\s*do_initrd\s*=\s*(no|false|0)\s*$/ig;
$use_hard_links = '' if /^\s*use_hard_links\s*=\s*(no|false|0)\s*$/ig;
$silent_modules = '' if /^\s*silent_modules\s*=\s*(no|false|0)\s*$/ig;
$silent_loader = '' if /^\s*silent_loader\s*=\s*(no|false|0)\s*$/ig;
$warn_reboot = '' if /^\s*warn_reboot\s*=\s*(no|false|0)\s*$/ig;
$minimal_swap = '' if /^\s*minimal_swap\s*=\s*(no|false|0)\s*$/ig;
$ignore_depmod_err = '' if /^\s*ignore_depmod_err\s*=\s*(no|false|0)\s*$/ig;
$do_symlink = "Yes" if /^\s*do_symlinks\s*=\s*(yes|true|1)\s*$/ig;
$no_symlink = "Yes" if /^\s*no_symlinks\s*=\s*(yes|true|1)\s*$/ig;
$reverse_symlink = "Yes" if /^\s*reverse_symlinks\s*=\s*(yes|true|1)\s*$/ig;
$link_in_boot = "Yes" if /^\s*image_in_boot\s*=\s*(yes|true|1)\s*$/ig;
$link_in_boot = "Yes" if /^\s*link_in_boot\s*=\s*(yes|true|1)\s*$/ig;
$move_image = "Yes" if /^\s*move_image\s*=\s*(yes|true|1)\s*$/ig;
$clobber_modules = "Yes" if /^\s*clobber_modules\s*=\s*(yes|true|1)\s*$/ig;
$do_boot_enable = "Yes" if /^\s*do_boot_enable\s*=\s*(yes|true|1)\s*$/ig;
$do_bootfloppy = "Yes" if /^\s*do_bootfloppy\s*=\s*(yes|true|1)\s*$/ig;
$do_bootloader = "Yes" if /^\s*do_bootloader\s*=\s*(yes|true|1)\s*$/ig;
$explicit_do_loader = "YES" if /^\s*do_bootloader\s*=\s*(yes|true|1)\s*$/ig;
$relative_links = "Yes" if /^\s*relative_links\s*=\s*(yes|true|1)\s*$/ig;
$do_initrd = "Yes" if /^\s*do_initrd\s*=\s*(yes|true|1)\s*$/ig;
$use_hard_links = "Yes" if /^\s*use_hard_links\s*=\s*(yes|true|1)\s*$/ig;
$silent_modules = 'Yes' if /^\s*silent_modules\s*=\s*(yes|true|1)\s*$/ig;
$silent_loader = 'Yes' if /^\s*silent_loader\s*=\s*(yes|true|1)\s*$/ig;
$warn_reboot = 'Yes' if /^\s*warn_reboot\s*=\s*(yes|true|1)\s*$/ig;
$minimal_swap = 'Yes' if /^\s*minimal_swap\s*=\s*(yes|true|1)\s*$/ig;
$ignore_depmod_err = 'Yes' if /^\s*ignore_depmod_err\s*=\s*(yes|true|1)\s*$/ig;
$image_dest = "$1" if /^\s*image_dest\s*=\s*(\S+)/ig;
$postinst_hook = "$1" if /^\s*postinst_hook\s*=\s*(\S+)/ig;
$postrm_hook = "$1" if /^\s*postrm_hook\s*=\s*(\S+)/ig;
$preinst_hook = "$1" if /^\s*preinst_hook\s*=\s*(\S+)/ig;
$prerm_hook = "$1" if /^\s*prerm_hook\s*=\s*(\S+)/ig;
$ramdisk = "$1" if /^\s*ramdisk\s*=\s*(.+)$/ig;
}
close CONF;
$have_conffile = "Yes";
}
}
$initrd = '' if (! -x "$ramdisk");
# For some versions of kernel-package, we had this warning in the
# postinst, but the rules did not really interpolate the value in.
# Here is a sanity check.
my $pattern = "=" . "I";
$initrd=~ s/^$pattern$//;
if ($link_in_boot) {
$image_dest = "/$image_dir/"; # same as realimageloc
}
# Tack on at least one trainling /
$image_dest = "$image_dest/";
$image_dest =~ s|^/*|/|o;
$image_dest =~ s|/+$|/|o;
if (! -d "$image_dest") {
die "Expected Image Destination dir ($image_dest) to be a valid directory!\n";
}
# sanity
if (!($do_bootfloppy || $do_bootloader)) {
$do_boot_enable = '';
}
if ($do_symlink && $no_symlink) {
warn "Both do_symlinks and no_symlinks options enabled; disabling no_symlinks\n";
$no_symlink = 0;
}
# most of our work is done in $image_dest (nominally /)
chdir("$image_dest") or die "could not chdir to $image_dest:$!\n";
# Paranoid check to make sure that the correct value is put in there
if (! $kimage) { $kimage = "vmlinuz"; } # Hmm. empty
elsif ($kimage =~ m/^b?uImage$/o) { $kimage = "vmlinuz"; } # these produce vmlinuz
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
$ENV{KERNEL_ARCH}=$kernel_arch if $kernel_arch;
die "Internal Error: Could not find image (" . $realimageloc
. "$kimage-$version)\n" unless -e $realimageloc
. "$kimage-$version";
# search for the boot loader in the path
my $loader_exec;
($loader_exec = $loader) =~ s|.*/||;
my ($loaderloc) = grep -x, map "$_/$loader_exec",
map { length($_) ? $_ : "." } split /:/, $ENV{PATH};
######################################################################
######################################################################
########### Test whether a relative symlinkwould be OK #######
######################################################################
######################################################################
sub test_relative {
my %params = @_;
my $cwd;
die "Internal Error: Missing Required paramater 'Old Dir' "
unless $params{'Old Dir'};
die "Internal Error: Missing Required paramater New Dir' "
unless $params{'New Dir'};
die "Internal Error: No such dir $params{'Old Dir'} "
unless -d $params{'Old Dir'};
die "Internal Error: No such dir $params{'New Dir'} "
unless -d $params{'New Dir'};
# If the caller specified a test file, and it does not exist try and find
# another file to use in its stead. As we are installing kernels we can
# use any versioned file from this kernel which should be in the same place.
if (defined $params{'Test File'} and
! -f $params{'Old Dir'} . '/' . $params{'Test File'}) {
my @possible = glob($params{'Old Dir'} . "/*$version*");
if ($#possible >= 0) {
$params{'Test File'} = `basename "$possible[0]"`;
chomp($params{'Test File'});
warn "Test relative: selected $params{'Test File'}"
if $DEBUG;
}
}
warn "Test relative: testing $params{'Old Dir'} -> $params{'New Dir'}"
if $DEBUG;
chomp($cwd = `pwd`);
chdir ($params{'New Dir'}) or die "Could not chdir to $params{'New Dir'}:$!";
my $ok = 0;
$params{'Old Dir'} =~ s|^/*||o;
if (-d $params{'Old Dir'} ) {
if (defined $params{'Test File'}) {
if (-e $params{'Old Dir'} . $params{'Test File'}) {
$ok = 1;
}
} else {
$ok = 1; # well, backward compatibility
}
}
chdir ($cwd) or die "Could not chdir to $params{'New Dir'}:$!";
return $ok;
}
######################################################################
######################################################################
############
######################################################################
######################################################################
# 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);
# }
######################################################################
######################################################################
############
######################################################################
######################################################################
sub spath {
my %params = @_;
die "Missing Required paramater 'Old'" unless $params{'Old'};
die "Missing Required paramater 'New'" unless $params{'New'};
my @olddir = split '/', `readlink -q -m $params{'Old'}`;
my @newdir = split '/', `readlink -q -m $params{'New'}`;
my @outdir = @olddir;
my $out = '';
my $i;
for ($i = 0; $i <= $#olddir && $i <= $#newdir; $i++) {
$out++ if ($olddir[$i] ne $newdir[$i]);
shift @outdir unless $out;
unshift @outdir, ".." if $out;
}
if ($#newdir > $#olddir) {
for ($i=0; $i < $#newdir; $i++) {
unshift @outdir, "..";
}
}
return join ('/', @outdir);
}
######################################################################
######################################################################
############
######################################################################
######################################################################
# This routine actually moves the kernel image
# From: $realimageloc/$kimage-$version (/boot/vmlinuz-2.6.12)
# To: $image_dest/$kimage-$version (/vmlinuz-2.6.12)
# Note that the image is moved to a versioned destination, but ordinary
# symlinks we create otherwise are not normally versioned
sub really_move_image {
my $src_dir = $_[0];
my $target = $_[1];
my $dest_dir = $_[2];
warn "Really move image: src_dir=$src_dir, target=$target,\n destdir=$dest_dir"
if $DEBUG;
if (-e "$target") {
# we should be in dir $dest_dir == $image_dest /, normally
rename("$target", "$target.$$") ||
die "failed to move " . $dest_dir . "$target:$!";
warn "mv $target $target.$$" if $DEBUG;
}
warn "mv -f $src_dir$target $target" if $DEBUG;
my $ret = system("mv -f " . $src_dir . "$target " .
" $target");
if ($ret) {
die("Failed to move " . $src_dir . "$target to "
. $dest_dir . "$target");
}
# Ok, now we may clobber the previous .old files
if (-e "$target.$$") {
rename("$target.$$", "$target.old") ||
die "failed to move " . $dest_dir . "$target:$!";
warn "mv $target.$$ $target " if $DEBUG;
}
}
# Normally called after really_move_image; and only called if we asked for
# reversed link this routine reverses the symbolic link that is notmally
# created. Since the real kernel image has been moved over to
# $image_dest/$kimage-$version. So, this routine links
# From: $image_dest/$kimage-$version (/vmlinuz-2.6.12)
# To: $realimageloc/$kimage-$version (/boot/vmlinuz-2.6.12)
sub really_reverse_link {
my $src_dir = $_[0];
my $link_name = $_[1];
my $dest_dir = $_[2];
warn "Really reverse link: src_dir=$src_dir, link name=$link_name\n" .
"\tdestdir=$dest_dir" if $DEBUG;
my $Old = $dest_dir;
if (test_relative ('Old Dir' => $Old, 'New Dir' => $src_dir,
'Test File' => "$link_name")) {
$Old =~ s|^/*||o;
}
# Special case is they are in the same dir
my $rel_path = spath('Old' => "$Old", 'New' => "$src_dir" );
$Old ="" if $rel_path =~ m/^\s*$/o;
if ($use_hard_links =~ m/YES/i) {
link($Old . "$link_name", $src_dir . "$link_name") ||
die("Failed to link " . $dest_dir . "$link_name to " . $src_dir .
"$link_name:$!");
warn "ln " . $Old . "$link_name " . $src_dir . "$link_name" if $DEBUG;
}
else {
symlink($Old . "$link_name", $src_dir . "$link_name") ||
die("Failed to symbolic-link " . $dest_dir . "$link_name to " . $src_dir
. "$link_name:$!");
warn "ln -s " . $Old . "$link_name " . $src_dir . "$link_name" if $DEBUG;
}
}
# This routine is invoked if there is a symbolic link in place
# in $image_dest/$kimage -- so a symlink exists in the destination.
# What we are trying to determine is if we need to move the symbolic link over
# to the the .old location
sub move_p {
my $kimage = $_[0]; # Name of the symbolic link
my $image_dest = $_[1]; # The directory the links goes into
my $image_name = $_[2];
my $src_dir = $_[3];
my $force_move = 0;
warn "Move?: kimage=$kimage, image_dest=$image_dest, \n" .
"\timage_name=$image_name, src_dir=$src_dir" if $DEBUG;
if ($no_symlink || $reverse_symlink) {
# we do not want links, yet we have a symbolic link here!
warn "found a symbolic link in " . $image_dest . "$kimage \n" .
"even though no_symlink is defined\n" if $no_symlink;
warn "found a symbolic link in " . $image_dest . "$kimage \n" .
"even though reverse_symlink is defined\n" if $reverse_symlink;
# make sure we change this state of affairs
$force_move = 1;
return $force_move;
}
warn "DEBUG: OK. We found symlink, and we should have a symlink here.\n"
if $DEBUG;
my $vmlinuz_target = readlink "$kimage";
my $real_target = '';
my $target = `readlink -q -m "${realimageloc}${kimage}-${version}"`;
$real_target = abs_path($vmlinuz_target) if defined($vmlinuz_target);
if (!defined($vmlinuz_target) || ! -f "$real_target") {
# what, a dangling symlink?
warn "The link " . $image_dest . "$kimage is a dangling link" .
"to $real_target\n";
$force_move = 1;
return $force_move;
}
warn "DEBUG: The link $kimage points to ($vmlinuz_target)\n" if $DEBUG;
warn "DEBUG: ($vmlinuz_target) is really ($real_target)\n" if $DEBUG;
my $cwd;
chomp ($cwd=`pwd`);
if ($vmlinuz_target !~ m|^/|o) {
$vmlinuz_target = $cwd . "/" . $vmlinuz_target;
$vmlinuz_target =~ s|/+|/|o;
}
$vmlinuz_target = `readlink -q -m $vmlinuz_target`;
if ("$vmlinuz_target" ne "$target") {
warn "DEBUG: We need to handle this.\n" if $DEBUG;
if ($minimal_swap) {
warn "DEBUG: Minimal swap.\n" if $DEBUG;
if (-l "$kimage.old") {
warn "DEBUG: There is an old link at $kimage.old\n" if $DEBUG;
my $old_target = readlink "$kimage.old";
my $real_old_target = '';
$real_old_target=abs_path($old_target) if defined ($old_target);
if ($real_old_target && -f "$real_old_target") {
if ($old_target !~ m|^/|o) {
$old_target = $cwd . "/" . $old_target;
$old_target =~ s|/+|/|o;
}
$old_target = `readlink -q -m $old_target`;
if ("$old_target" ne "$target") {
$force_move = 1;
warn "DEBUG: Old link ($old_target) does not point to us ($target)\n"
if $DEBUG;
}
else { # The .old points to the current
warn "$kimage.old --> $target -- doing nothing";
$force_move = 0;
}
}
else {
warn "DEBUG: Well, the old link does not exist -- so we move\n"
if $DEBUG;
$force_move = 1;
}
}
else {
warn "DEBUG: No .old link -- OK to move\n"
if $DEBUG;
$force_move = 1;
}
}
else {
warn "DEBUG: ok, minimal swap is no-- so we move.\n"
if $DEBUG;
$force_move = 1;
}
}
else { # already have proper link
warn "$kimage($vmlinuz_target) points to $target ($real_target) -- doing nothing";
$force_move = 0;
}
return $force_move;
}
# This routine moves the symbolic link around (/vmlinuz -> /vmlinuz.old)
# It pays attention to whether we should the fact whether we should be using
# hard links or not.
sub really_move_link {
my $kimage = $_[0]; # Name of the symbolic link
my $image_dest = $_[1]; # The directory the links goes into
my $image_name = $_[2];
my $src_dir = $_[3];
warn "really_move_link: kimage=$kimage, image_dest=$image_dest\n" .
"\t image_name=$image_name, src_dir=$src_dir" if $DEBUG;
# don't clobber $kimage.old quite yet
rename("$kimage", "$kimage.$$") ||
die "failed to move " . $image_dest . "$kimage:$!";
warn "mv $kimage $kimage.$$" if $DEBUG;
my $Old = $src_dir;
my $cwd;
chomp($cwd=`pwd`);
if (test_relative ('Old Dir' => $Old, 'New Dir' => $cwd,
'Test File' => "$image_name")) {
$Old =~ s|^/*||o;
}
# Special case is they are in the same dir
my $rel_path = spath('Old' => "$Old", 'New' => "$cwd" );
$Old ="" if $rel_path =~ m/^\s*$/o;
if ($use_hard_links =~ m/YES/i) {
warn "ln ${Old}${image_name} $kimage" if $DEBUG;
if (! link("${Old}${image_name}", "$kimage")) {
rename("$kimage.$$", "$kimage");
die("Failed to link ${Old}${image_name} to " .
"${image_dest}${kimage}:$!");
}
}
else {
warn "ln -s ${Old}${image_name} $kimage" if $DEBUG;
if (! symlink("${Old}${image_name}", "$kimage")) {
rename("$kimage.$$", "$kimage");
die("Failed to symbolic-link ${Old}${image_name} to " .
"${image_dest}${kimage}:$!");
}
}
# Ok, now we may clobber the previous .old file
if (-l "$kimage.old" || ! -e "$kimage.old" ) {
rename("$kimage.$$", "$kimage.old");
warn "mv $kimage.$$ $kimage.old" if $DEBUG;
}
else {
warn "$kimage.old is not a symlink, not clobbering\n";
warn "rm $kimage.$$";
unlink "$kimage.$$" if $DEBUG;
}
}
# This routine handles a request to do symlinks, but there is no
# symlink file already there. Either we are supposed to use copy, or we are
# installing on a pristine system, or the user does not want symbolic links at
# all. We use a configuration file to tell the last two cases apart, creating
# a config file if needed.
sub handle_missing_link {
my $kimage = $_[0]; # Name of the symbolic link
my $image_dest = $_[1]; # The directory the links goes into
my $image_name = $_[2];
my $src_dir = $_[3];
warn "handle_missing_link: kimage=$kimage, image_dest=$image_dest\n" .
"\t image_name=$image_name, src_dir=$src_dir" if $DEBUG;
if ($no_symlink) {
warn "cp -a --backup=t $realimageloc$image_name $kimage" if $DEBUG;
my $ret = system("cp -a --backup=t " . $realimageloc .
"$image_name " . " $kimage");
if ($ret) {
die("Failed to copy " . $realimageloc . "$image_name to "
. $image_dest . "$kimage");
}
}
elsif ($reverse_symlink) {
warn "mv -f $realimageloc$image_name $kimage" if $DEBUG;
my $ret = system("mv -f " . $realimageloc . "$image_name "
. "$kimage");
if ($ret) {
die("Failed to move " . $realimageloc . "$image_name to "
. $image_dest . "$kimage");
}
}
else {
if (! $have_conffile) {
my $ret;
my $answer='';
$do_symlink = "Yes";
if (open(CONF, ">$CONF_LOC")) {
print CONF "# Kernel Image management overrides\n";
print CONF "# See kernel-img.conf(5) for details\n";
if ($loader =~ /palo/i) {
print CONF "link_in_boot = Yes\n";
print CONF "do_symlinks = Yes\n";
print CONF "relative_links = Yes\n";
print CONF "do_bootloader = No\n";
} else {
print CONF "do_symlinks = $do_symlink\n";
}
close CONF;
}
$have_conffile = "Yes";
}
}
if (! $no_symlink && $do_symlink =~ /Yes/i) {
my $Old = $realimageloc;
my $New = $image_dest;
my $Name = "$image_name";
my $Link_Dest = "$kimage";
if ($reverse_symlink) {
$Old = $image_dest;
$New = $realimageloc;
$Name = "$kimage";
$Link_Dest = $realimageloc . "$image_name";
}
if (test_relative ('Old Dir' => $Old,
'New Dir' => $New,
'Test File' => $Name)) {
$Old =~ s|^/*||o;
}
# Special case is they are in the same dir
my $rel_path = spath('Old' => "$Old", 'New' => "$New" );
$Old ="" if $rel_path =~ m/^\s*$/o;
symlink($Old . "$Name", "$Link_Dest") ||
die("Failed to symbolic-link ${Old}$Name to $Link_Dest:$!");
warn "ln -s ${Old}$Name $Link_Dest" if $DEBUG;
}
}
# This routine handles the rest of the cases, where the user has requested
# non-traditional handling, like using cp, or reverse symlinks, or hard links.
sub handle_non_symlinks {
my $kimage = $_[0]; # Name of the symbolic link
my $image_dest = $_[1]; # The directory the links goes into
my $image_name = $_[2];
my $src_dir = $_[3];
warn "handle_non_link: kimage=$kimage, image_dest=$image_dest\n" .
"\t image_name=$image_name, src_dir=$src_dir" if $DEBUG;
# Save the current image. We do this in all four cases
rename("$kimage", "$kimage.$$") ||
die "failed to move " . $image_dest . "$kimage:$!";
warn "mv $kimage $kimage.$$" if $DEBUG;
##,####
# case One
#`####
if ($no_symlink) {
# Maybe /$image_dest is on a dos system?
warn "cp -a --backup=t $realimageloc$image_name $kimage" if $DEBUG;
my $ret = system("cp -a --backup=t " . $realimageloc
. "$image_name " . "$kimage");
if ($ret) {
if (-e "$kimage.$$") {
rename("$kimage.$$", "$kimage");
warn "mv $kimage.$$ $kimage" if $DEBUG;
}
die("Failed to copy " . $realimageloc . "$image_name to "
. $image_dest . "$kimage");
}
}
##,####
# case Two
#`####
elsif ($reverse_symlink) { # Maybe /$image_dest is on a dos system?
warn "mv -f $realimageloc$image_name $kimage" if $DEBUG;
my $ret = system("mv -f " . $realimageloc . "$image_name "
. $image_dest . "$kimage");
if ($ret) {
if (-e "$kimage.$$") {
rename("$kimage.$$", "$kimage");
warn "mv $kimage.$$ $kimage" if $DEBUG;
}
die("Failed to move " . $realimageloc . "$image_name to "
. $image_dest . "$kimage");
}
my $Old = $image_dest;
if (test_relative ('Old Dir' => $Old, 'New Dir' => $realimageloc,
'Test File' => "$kimage")) {
$Old =~ s|^/*||o;
}
# Special case is they are in the same dir
my $rel_path = spath('Old' => "$Old", 'New' => "$realimageloc" );
$Old ="" if $rel_path =~ m/^\s*$/o;
if ($use_hard_links =~ m/YES/i) {
warn "ln " . $Old . "$kimage " . $realimageloc . "$image_name" if $DEBUG;
if (! link($Old . "$kimage", $realimageloc . "$image_name")) {
warn "Could not link " . $image_dest .
"$kimage to $image_name :$!";
}
}
else {
warn "ln -s " . $Old . "$kimage " . $realimageloc . "$image_name" if $DEBUG;
if (! symlink($Old . "$kimage", $realimageloc . "$image_name")) {
warn "Could not symlink " . $image_dest .
"$kimage to $image_name :$!";
}
}
}
##,####
# case Three
#`####
elsif ($use_hard_links =~ m/YES/i ) {
# Ok then. this ought to be a hard link, and hence fair game
# don't clobber $kimage.old quite yet
my $Old = $realimageloc;
my $cwd;
chomp($cwd=`pwd`);
if (test_relative ('Old Dir' => $Old, 'New Dir' => $cwd,
'Test File' => "$image_name")) {
$Old =~ s|^/*||o;
}
# Special case is they are in the same dir
my $rel_path = spath('Old' => "$Old", 'New' => "$cwd" );
$Old ="" if $rel_path =~ m/^\s*$/o;
warn "ln " . $Old . "$image_name " . "$kimage" if $DEBUG;
if (! link($Old . "$image_name", "$kimage")) {
warn "mv $kimage.$$ $kimage" if $DEBUG;
rename("$kimage.$$", "$kimage");
die("Failed to link " . $realimageloc . "$image_name to "
. $image_dest . "$kimage");
}
}
##,####
# case Five!?!
#`####
elsif ($do_symlink) {
# Ok then. this ought to be a symlink, and hence fair game
# don't clobber $kimage.old quite yet
my $Old = $realimageloc;
my $cwd;
chomp($cwd=`pwd`);
if (test_relative ('Old Dir' => $Old, 'New Dir' => $cwd,
'Test File' => "$image_name")) {
$Old =~ s|^/*||o;
}
# Special case is they are in the same dir
my $rel_path = spath('Old' => "$Old", 'New' => "$cwd" );
$Old ="" if $rel_path =~ m/^\s*$/o;
warn "symlink " . $Old . "$image_name " . "$kimage" if $DEBUG;
if (! symlink($Old . "$image_name", "$kimage")) {
warn "mv $kimage.$$ $kimage" if $DEBUG;
rename("$kimage.$$", "$kimage");
die("Failed to link " . $realimageloc . "$image_name to "
. $image_dest . "$kimage");
}
}
##,####
# case Four
#`####
else {
# We just use cp
warn "cp -a --backup=t $realimageloc$image_name $kimage" if $DEBUG;
my $ret = system("cp -a --backup=t " . $realimageloc
. "$image_name " . "$kimage");
if ($ret) {
if (-e "$kimage.$$") {
warn "mv $kimage.$$ $kimage" if $DEBUG;
rename("$kimage.$$", "$kimage");
}
die("Failed to copy " . $realimageloc . "$image_name to "
. $image_dest . "$kimage");
}
}
# Ok, now we may clobber the previous .old file
warn "mv $kimage.$$ $kimage.old if -e $kimage.$$" if $DEBUG;
rename("$kimage.$$", "$kimage.old") if -e "$kimage.$$";
}
# This routine is responsible for setting up the symbolic links
# So, the actual kernel image lives in
# $realimageloc/$image_name (/boot/vmlinuz-2.6.12).
# This routine creates symbolic links in $image_dest/$kimage (/vmlinuz)
sub image_magic {
my $kimage = $_[0]; # Name of the symbolic link
my $image_dest = $_[1]; # The directory the links goes into
my $image_name = "$kimage-$version";
my $src_dir = $realimageloc;
warn "image_magic: kimage=$kimage, image_dest=$image_dest\n" .
"\t image_name=$image_name, src_dir=$src_dir" if $DEBUG;
# Well, in any case, if the destination (the symlink we are trying
# to create) is a directory, we should do nothing, except throw a
# diagnostic.
if (-d "$kimage" ) {
die ("Hmm. $kimage is a directory, which I did not expect. I am\n" .
"trying to create a symbolic link with that name linked to \n" .
"$image_dest . Since a directory exists here, my assumptions \n" .
"are way off, and I am aborting.\n" );
exit (3);
}
if ($move_image) { # Maybe $image_dest is in on dos, or something?
# source dir, link name, dest dir
really_move_image( $realimageloc, $image_name, $image_dest);
really_reverse_link($realimageloc, $image_name, $image_dest)
if $reverse_symlink;
return;
}
if (-l "$kimage") { # There is a symbolic link
warn "DEBUG: There is a symlink for $kimage\n" if $DEBUG;
my $force_move = move_p($kimage, $image_dest, $image_name, $src_dir);
if ($force_move) {
really_move_link($kimage, $image_dest, $image_name, $src_dir);
}
}
elsif (! -e "$kimage") {
# Hmm. Pristine system? How can that be? Installing from scratch?
# Or maybe the user does not want a symbolic link here.
# Possibly they do not want a link here. (we should be in /
# here[$image_dest, really]
handle_missing_link($kimage, $image_dest, $image_name, $src_dir);
}
elsif (-e "$kimage" ) {
# OK, $kimage exists -- but is not a link
handle_non_symlinks($kimage, $image_dest, $image_name, $src_dir);
}
}
######################################################################
######################################################################
######################################################################
######################################################################
# We may not have any modules installed
if ( -d "$modules_base/$version" ) {
print STDERR "Running depmod.\n";
my $ret = system("depmod -a $version");
if ($ret) {
print STDERR "Failed to run depmod\n";
exit(1);
}
}
sub find_initrd_tool {
my $hostversion = shift;
my $version = shift;
print STDERR "Finding valid ramdisk creators.\n";
my @ramdisks =
grep {
my $args =
"$_ " .
"--supported-host-version=$hostversion " .
"--supported-target-version=$version " .
"1>/dev/null 2>&1"
;
system($args) == 0;
}
split (/[:,\s]+/, $ramdisk);
}
# The initrd symlink should probably be in the same dir that the
# symlinks are in
if ($initrd) {
my $success = 0;
# Update-initramfs is called slightly different than mkinitrd and
# mkinitramfs. XXX It should really be made compatible with this stuff
# some how.
my $upgrading = 1;
if (! defined $ARGV[1] || ! $ARGV[1] || $ARGV[1] =~ m/<unknown>/og) {
$upgrading = 0;
}
my $ret = system("$ramdisk " . ($upgrading ? "-u" : "-c") . " -k " . $version . " >&2");
$success = 1 unless $ret;
die "Failed to create initrd image.\n" unless $success;
if (! defined $ARGV[1] || ! $ARGV[1] || $ARGV[1] =~ m/<unknown>/og) {
image_magic("initrd.img", $image_dest);
}
else {
lstat("initrd.img");
if (! -e _) {
handle_missing_link("initrd.img", $image_dest, "initrd.img-$version",
$realimageloc);
}
else {
print STDERR
"Not updating initrd symbolic links since we are being updated/reinstalled \n";
print STDERR
"($ARGV[1] was configured last, according to dpkg)\n";
}
}
if ($initrd && -l "initrd" ) {
unlink "initrd";
}
if ($initrd && -l "$image_dir/initrd" && ! $link_in_boot) {
unlink "$image_dir/initrd";
}
}
else { # Not making an initrd emage
if (-l "initrd.img") {
# Ooh, last image was an initrd image? in any case, we should move it.
my $target = readlink "initrd.img";
my $real_target = '';
$real_target = abs_path($target) if defined ($target);
if (!defined($target) || ! -f "$real_target") {
# Eh. dangling link. can safely be removed.
unlink("initrd.img");
} else {
if (-l "initrd.img.old" || ! -e "initrd.img.old" ) {
rename("initrd.img", "initrd.img.old");
} else {
warn "initrd.img.old is not a symlink, not clobbering\n";
unlink("initrd.img");
}
}
}
}
# Warn of a reboot
if (-x $notifier) {
system($notifier);
}
# Let programs know not to hibernate if the kernel that would be used for
# resume-from-hibernate is likely to differ from the currently running kernel.
system("mountpoint -q /var/run");
if ($? eq 0) {
system("touch /var/run/do-not-hibernate");
}
# Only change the symlinks if we are not being upgraded
if (! defined $ARGV[1] || ! $ARGV[1] || $ARGV[1] =~ m/<unknown>/og) {
image_magic($kimage, $image_dest);
}
else {
lstat("$kimage");
if (! -e _) {
handle_missing_link($kimage, $image_dest, "$kimage-$version",
$realimageloc);
}
else {
print STDERR
"Not updating image symbolic links since we are being updated/reinstalled \n";
print STDERR
"($ARGV[1] was configured last, according to dpkg)\n";
}
}
# We used to have System.* files in /
if (-e "/System.map" || -e "/System.old") {
unlink '/System.map' if -e '/System.map';
unlink '/System.old' if -e '/System.old';
}
# creating some info about kernel and initrd
if ($DEBUG) {
my $ksize=sprintf("%.0f",(stat($realimageloc .
"$kimage-$version"))[7]/1024)."kB";
my $initrdsize='';
if ($initrd) {
$initrdsize=sprintf("%.0f",(stat($realimageloc .
"initrd.img-$version"))[7]/1024)."kB";
}
print STDERR <<"EOMSG";
A new kernel image has been installed at $realimageloc$kimage-$version
(Size: $ksize)
Symbolic links, unless otherwise specified, can be found in $image_dest
EOMSG
;
if ($initrd) {
print STDERR <<"EOMSGA";
Initial rootdisk image: ${realimageloc}initrd.img-$version (Size: $initrdsize)
EOMSGA
;
}
}
# set the env var stem
$ENV{'STEM'} = "linux";
sub exec_script {
my $type = shift;
my $script = shift;
print STDERR "Running $type hook script $script.\n";
system ("$script $version $realimageloc$kimage-$version") &&
print STDERR "User $type hook script [$script] ";
if ($?) {
if ($? == -1) {
print STDERR "failed to execute: $!\n";
}
elsif ($? & 127) {
printf STDERR "died with signal %d, %s coredump\n",
($? & 127), ($? & 128) ? 'with' : 'without';
}
else {
printf STDERR "exited with value %d\n", $? >> 8;
}
exit $? >> 8;
}
}
sub run_hook {
my $type = shift;
my $script = shift;
if ($script =~ m,^/,) {
# Full path provided for the hook script
if (-x "$script") {
&exec_script($type,$script);
}
else {
die "The provided $type hook script [$script] could not be run.\n";
}
}
else {
# Look for it in a safe path
for my $path ('/bin', '/sbin', '/usr/bin', '/usr/sbin') {
if (-x "$path/$script") {
&exec_script($type, "$path/$script");
return 0;
}
}
# No luck
print STDERR "Could not find $type hook script [$script].\n";
die "Looked in: '/bin', '/sbin', '/usr/bin', '/usr/sbin'\n";
}
}
my $options;
for (@ARGV) {
s,','\\'',g;
$options .= " '$_'";
}
$ENV{'DEB_MAINT_PARAMS'}="$options";
## Run user hook script here, if any
if ($postinst_hook) {
&run_hook("postinst", $postinst_hook);
}
if (-d "/etc/kernel/postinst.d") {
print STDERR "Examining /etc/kernel/postinst.d.\n";
system ("run-parts --verbose --exit-on-error --arg=$version " .
"--arg=$realimageloc$kimage-$version " .
"/etc/kernel/postinst.d") &&
die "Failed to process /etc/kernel/postinst.d";
}
if (-d "/etc/kernel/postinst.d/$version") {
print STDERR "Examining /etc/kernel/postinst.d/$version.\n";
system ("run-parts --verbose --exit-on-error --arg=$version " .
"--arg=$realimageloc$kimage-$version " .
"/etc/kernel/postinst.d/$version") &&
die "Failed to process /etc/kernel/postinst.d/$version";
}
LOADER: {
last unless $do_boot_enable; # Exit if explicitly asked to
last if $loader =~ /silo/i; # SILO does not have to be executed.
last if $loader =~ /yaboot/i; # yaboot does not have to be executed.
last if $loader =~ /milo/i; # MILO does not have to be executed.
last if $loader =~ /nettrom/i; # NETTROM does not have to be executed.
last if $loader =~ /arcboot/i; # ARCBOOT does not have to be executed.
last if $loader =~ /delo/i; # DELO does not have to be executed.
last if $loader =~ /quik/i; # maintainer asked quik invocation to be ignored
last unless $loaderloc;
last unless -x $loaderloc;
last unless $do_bootloader;
if (-T "/etc/$loader.conf") {
# Trust and use the existing lilo.conf.
print STDERR "You already have a $Loader configuration in /etc/$loader.conf\n";
my $ret = &run_lilo();
exit $ret if $ret;
}
}
sub run_lilo (){
my $ret;
# Try and figure out if the user really wants lilo to be run --
# since the default is to run the boot laoder, which is ! grub -- but
# the user may be using grub now, and not changed the default.
# So, if the user has explicitly asked for the loader to be run, or
# if there is no postinst hook, or if there is no grub installed --
# we are OK. Or else, we ask.
if ($explicit_do_loader || (! ($postinst_hook && -x '/usr/sbin/grub'))) {
print STDERR "Running boot loader as requested\n";
} else {
print STDERR "Ok, not running $loader\n";
}
if ($loader =~ /^lilo/io or $loader =~ /vmelilo/io) {
print STDERR "Testing $loader.conf ... \n";
unlink $temp_file_name; # security
$ret = system("$loaderloc -t >$temp_file_name 2>&1");
if ($ret) {
print STDERR "Boot loader test failed\n";
return $ret;
}
unlink "$temp_file_name";
print STDERR "Testing successful.\n";
print STDERR "Installing the ";
print STDERR "partition " if $loader =~ /^lilo/io;
print STDERR "boot sector... \n";
}
print STDERR "Running $loaderloc ... \n";
if ($loader =~ /^elilo/io) {
$ret = system("$loaderloc 2>&1 | tee $temp_file_name");
} else {
$ret = system("$loaderloc >$temp_file_name 2>&1");
}
if ($ret) {
print STDERR "Boot loader failed to run\n";
return $ret;
}
unlink $temp_file_name;
print STDERR "Installation successful.\n";
return 0;
}
exit 0;
__END__
SEA-GHOST - SHELL CODING BY SEA-GHOST