159 lines
4.0 KiB
Perl
Executable File
159 lines
4.0 KiB
Perl
Executable File
#! /usr/bin/perl
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#
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use strict;
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use warnings;
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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 = "@abiname@@localversion@";
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my $kimage = "@image-stem@";
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my $prerm_hook = ''; #Normally we do not
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my $package_name = "linux-image-$version";
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#known variables
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my $realimageloc = "/boot/";
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my $CONF_LOC = '/etc/kernel-img.conf';
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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 $WouldInvalidate = 0;
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# Ignore all invocations uxcept when called on to remove
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exit 0 unless ($ARGV[0] && $ARGV[0] =~ /remove/) ;
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if (-r "$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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$prerm_hook = "$1" if /prerm_hook\s*=\s*(\S+)/i;
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}
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close CONF;
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}
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}
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#check to see if we are trying to remove a running kernel
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# if so we abort right now.
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chop($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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print STDERR "Aborting removal of running kernel image.\n";
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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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chdir("/") or die "could not chdir to /:$!\n";
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# set the env var stem
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$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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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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my $options;
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for (@ARGV) {
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s,','\\'',g;
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$options .= " '$_'";
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}
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$ENV{'DEB_MAINT_PARAMS'}="$options";
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## Run user hook script here, if any
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if (-x "$prerm_hook") {
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&run_hook("prerm", $prerm_hook);
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}
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if (-d "/etc/kernel/prerm.d") {
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system ("run-parts --report --exit-on-error --arg=$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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system ("run-parts --report --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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