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use IPC::Open2;
my($template) = @ARGV;
my $state = 0;
open(INPUT,$template) || return '';
my($md5sum_fd,$output_fd);
my $pid = open2($md5sum_fd, $output_fd, 'md5sum');
return '' if (!$pid);
while (<INPUT>) {
if ($state == 1) {
if (/^# here's the fallback if no module succeeds/) {
print $output_fd $_;
$state++;
}
next;
}
if ($state == 3) {
if (/^# end of pam-auth-update config/) {
print $output_fd $_;
$state++;
}
next;
}
print $output_fd $_;
my ($pattern,$val);
if ($state == 0) {
$pattern = '^# here are the per-package modules \(the "Primary" block\)';
} elsif ($state == 2) {
$pattern = '^# and here are more per-package modules \(the "Additional" block\)';
} else {
next;
}
if (/$pattern/) {
$state++;
}
}
close(INPUT);
close($output_fd);
my $md5sum = <$md5sum_fd>;
close($md5sum_fd);
waitpid $pid, 0;
$md5sum = (split(/\s+/,$md5sum))[0];
print $md5sum;
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