534 lines
17 KiB
Perl
Executable File
534 lines
17 KiB
Perl
Executable File
#! /usr/bin/perl
|
|
#
|
|
use strict;
|
|
use warnings;
|
|
use Cwd 'abs_path';
|
|
use POSIX ();
|
|
|
|
$|=1;
|
|
|
|
# Predefined values:
|
|
my $version = "@abiname@@localversion@";
|
|
my $arch = "@arch@";
|
|
my $link_in_boot = "";
|
|
my $no_symlink = "";
|
|
my $do_symlink = "Yes"; # target machine defined
|
|
my $kimage = "@image-stem@";
|
|
my $mkimage = ""; # command to generate the initrd image
|
|
my $use_hard_links = ''; # hardlinks do not work across fs boundaries
|
|
my $postinst_hook = ''; #Normally we do not
|
|
my $minimal_swap = ''; # Do not swap symlinks
|
|
my $package_name = "linux-image-$version";
|
|
|
|
#known variables
|
|
my $image_dest = "/";
|
|
my $realimageloc = "/boot/";
|
|
my $have_conffile = "";
|
|
|
|
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: ($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/\#.*$//g;
|
|
next if /^\s*$/;
|
|
|
|
$do_symlink = "" if /do_symlinks\s*=\s*(no|false|0)\s*$/i;
|
|
$no_symlink = "" if /no_symlinks\s*=\s*(no|false|0)\s*$/i;
|
|
$link_in_boot = "" if /link_in_boot\s*=\s*(no|false|0)\s*$/i;
|
|
$use_hard_links = '' if /use_hard_links\s*=\s*(no|false|0)\s*$/i;
|
|
$minimal_swap = '' if /minimal_swap\s*=\s*(no|false|0)\s*$/i;
|
|
|
|
$do_symlink = "Yes" if /do_symlinks\s*=\s*(yes|true|1)\s*$/i;
|
|
$no_symlink = "Yes" if /no_symlinks\s*=\s*(yes|true|1)\s*$/i;
|
|
$link_in_boot = "Yes" if /link_in_boot\s*=\s*(yes|true|1)\s*$/i;
|
|
$use_hard_links = "Yes" if /use_hard_links\s*=\s*(yes|true|1)\s*$/i;
|
|
$minimal_swap = 'Yes' if /minimal_swap\s*=\s*(yes|true|1)\s*$/i;
|
|
|
|
$image_dest = "$1" if /image_dest\s*=\s*(\S+)/i;
|
|
$postinst_hook = "$1" if /postinst_hook\s*=\s*(\S+)/i;
|
|
$mkimage = "$1" if /mkimage\s*=\s*(.+)$/i;
|
|
}
|
|
close CONF;
|
|
$have_conffile = "Yes";
|
|
}
|
|
}
|
|
|
|
|
|
if ($link_in_boot) {
|
|
$image_dest = $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_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";
|
|
|
|
|
|
die "Internal Error: Could not find image (" . $realimageloc
|
|
. "$kimage-$version)\n" unless -e $realimageloc
|
|
. "$kimage-$version";
|
|
|
|
|
|
######################################################################
|
|
######################################################################
|
|
########### 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'};
|
|
|
|
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 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 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) {
|
|
# 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;
|
|
# 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.$$") ||
|
|
die "failed to move " . $image_dest . "$kimage:$!";
|
|
my $Old = $src_dir;
|
|
my $cwd;
|
|
|
|
chomp($cwd=`pwd`);
|
|
if (test_relative ('Old Dir' => $Old, 'New Dir' => $cwd,
|
|
'Test File' => "$image_name")) {
|
|
$Old =~ s|^/*||o;
|
|
}
|
|
# Special case is they are in the same dir
|
|
my $rel_path = spath('Old' => "$Old", 'New' => "$cwd" );
|
|
$Old ="" if $rel_path =~ m/^\s*$/o;
|
|
|
|
if ($use_hard_links =~ m/YES/i) {
|
|
if (! link("${Old}${image_name}", "$kimage")) {
|
|
rename("$kimage.$$", "$kimage");
|
|
die("Failed to link ${Old}${image_name} to " .
|
|
"${image_dest}${kimage}.\n");
|
|
}
|
|
}
|
|
else {
|
|
if (! symlink("${Old}${image_name}", "$kimage")) {
|
|
rename("$kimage.$$", "$kimage");
|
|
die("Failed to symbolic-link ${Old}${image_name} to " .
|
|
"${image_dest}${kimage}.\n");
|
|
}
|
|
}
|
|
|
|
# Ok, now we may clobber the previous .old file
|
|
if (-l "$kimage.old" || ! -e "$kimage.old" ) {
|
|
rename("$kimage.$$", "$kimage.old");
|
|
}
|
|
else {
|
|
warn "$kimage.old is not a symlink, not clobbering\n";
|
|
warn "rm $kimage.$$";
|
|
}
|
|
}
|
|
|
|
# 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) {
|
|
my $ret = system("cp -a --backup=t " . $realimageloc .
|
|
"$image_name " . " $kimage");
|
|
if ($ret) {
|
|
die("Failed to copy " . $realimageloc . "$image_name to "
|
|
. $image_dest . "$kimage .\n");
|
|
}
|
|
}
|
|
|
|
if (! $no_symlink && $do_symlink =~ /Yes/i) {
|
|
my $Old = $realimageloc;
|
|
my $New = $image_dest;
|
|
my $Name = "$image_name";
|
|
my $Link_Dest = "$kimage";
|
|
|
|
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.\n");
|
|
|
|
}
|
|
}
|
|
|
|
# This routine handles the rest of the cases, where the user has requested
|
|
# non-traditional handling, like using cp 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:$!";
|
|
|
|
##,####
|
|
# case One
|
|
#`####
|
|
if ($no_symlink) {
|
|
# Maybe /$image_dest is on a dos system?
|
|
my $ret = system("cp -a --backup=t " . $realimageloc
|
|
. "$image_name " . "$kimage");
|
|
if ($ret) {
|
|
if (-e "$kimage.$$") {
|
|
rename("$kimage.$$", "$kimage");
|
|
}
|
|
die("Failed to copy " . $realimageloc . "$image_name to "
|
|
. $image_dest . "$kimage .\n");
|
|
}
|
|
}
|
|
##,####
|
|
# case Two
|
|
#`####
|
|
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;
|
|
|
|
if (! link($Old . "$image_name", "$kimage")) {
|
|
rename("$kimage.$$", "$kimage");
|
|
die("Failed to hard link " . $realimageloc . "$image_name to "
|
|
. $image_dest . "$kimage .\n");
|
|
}
|
|
}
|
|
##,####
|
|
# case Three
|
|
#`####
|
|
else {
|
|
# We just use cp
|
|
my $ret = system("cp -a --backup=t " . $realimageloc
|
|
. "$image_name " . "$kimage");
|
|
if ($ret) {
|
|
if (-e "$kimage.$$") {
|
|
rename("$kimage.$$", "$kimage");
|
|
}
|
|
die("Failed to copy " . $realimageloc . "$image_name to "
|
|
. $image_dest . "$kimage .\n");
|
|
}
|
|
}
|
|
# Ok, now we may clobber the previous .old file
|
|
rename("$kimage.$$", "$kimage.old") if -e "$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 $DEBUG;
|
|
|
|
if (-l "$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, $src_dir);
|
|
}
|
|
}
|
|
|
|
######################################################################
|
|
######################################################################
|
|
######################################################################
|
|
######################################################################
|
|
|
|
sub system_failure_message {
|
|
if ($? < 0) {
|
|
return "$!";
|
|
} elsif (POSIX::WIFSIGNALED($?)) {
|
|
return sprintf('signal %d', POSIX::WTERMSIG($?));
|
|
} else {
|
|
return sprintf('exit code %d', POSIX::WEXITSTATUS($?));
|
|
}
|
|
}
|
|
|
|
if (system("depmod -a -F $realimageloc/System.map-$version $version")) {
|
|
die ("depmod failed: " . system_failure_message());
|
|
}
|
|
|
|
|
|
# Only change the symlinks if we are not being upgraded
|
|
if (! defined $ARGV[1] || ! $ARGV[1] || $ARGV[1] =~ m/<unknown>/o) {
|
|
image_magic($kimage, $image_dest);
|
|
image_magic("initrd.img", $image_dest);
|
|
}
|
|
else {
|
|
lstat($kimage);
|
|
if (! -e _) {
|
|
handle_missing_link($kimage, $image_dest, "$kimage-$version",
|
|
$realimageloc);
|
|
}
|
|
lstat("initrd.img");
|
|
if (! -e _) {
|
|
handle_missing_link("initrd.img", $image_dest, "initrd.img-$version",
|
|
$realimageloc);
|
|
}
|
|
}
|
|
|
|
# set the env var stem
|
|
$ENV{'STEM'} = "linux";
|
|
|
|
sub run_hook {
|
|
my $type = shift;
|
|
my $script = shift;
|
|
|
|
print STDERR "Running $script.\n";
|
|
if (system ("$script $version $realimageloc$kimage-$version")) {
|
|
die ("$script failed: " . system_failure_message());
|
|
}
|
|
}
|
|
|
|
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", $postinst_hook);
|
|
}
|
|
|
|
if (-d "/etc/kernel/postinst.d") {
|
|
system ("run-parts --report --exit-on-error --arg=$version " .
|
|
"--arg=$realimageloc$kimage-$version " .
|
|
"/etc/kernel/postinst.d") &&
|
|
die "Failed to process /etc/kernel/postinst.d";
|
|
}
|
|
|
|
exit 0;
|
|
|
|
__END__
|