#!/usr/bin/perl

use DirHandle;
use FileHandle;
use strict;
no strict 'subs';

# Find the root of the locks directory
my $locksdirname = shift;
my $lduname      = shift;
my $ldgname      = shift;

# Turn them all into numbers and stuff with sensible defaults
#$locksdirname = '/var/spool/MailScanner/incoming/Locks'
$locksdirname=`/usr/sbin/ms-peek lockfiledir /etc/MailScanner/MailScanner.conf`
  unless $locksdirname =~ /^\//;
my $lduid = getpwnam($lduname);
my $ldgid = getgrnam($ldgname);

# If it's not a directory, destroy it and start again.
lstat $locksdirname;
unlink $locksdirname unless -d _;
lstat $locksdirname;
unless (-d _) {
  mkdir $locksdirname or die "Can't mkdir $locksdirname, $!";
}

# Now work through all the virus scanner autoupdate names, building Lock files.
my($dh, $fh, $updatename, $lockname, @updatenames, @locknames);
$dh = new DirHandle "/var/lib/MailScanner/wrapper";
die "Can't read dir /var/lib/MailScanner/wrapper to build list of -autoupdate scripts, $!" unless $dh;
while (defined($updatename = $dh->read)) {
  next unless $updatename =~ s/-autoupdate$//;
  next unless $updatename =~ /^[a-z0-9_-]+$/i; # No nasty chars thanks!
  $lockname = "$locksdirname/$updatename" . "Busy.lock";
  lstat $lockname;
  unless (-f _) {
    # It's not a plain file!
    if (-d _) {
      # It's a directory, so cannot just unlink it
      system("rm -rf $lockname");
    } else {
      # It's not a plain file nor a directory, so just remove it
      unlink $lockname;
    }
  }
  $fh = new FileHandle($lockname, O_CREAT|O_WRONLY|O_APPEND);
  $fh->close;
  # Quicker to collect them and do 1 big chmod and chown call later.
  push @locknames, $lockname;
}
$dh->close;

# Now do the Bayes rebuild lock files
my $lockfname;
foreach $lockfname ('MS.bayes.rebuild.lock', 'MS.bayes.starting.lock') {
  $lockname = "$locksdirname/$lockfname";
  lstat $lockname;
  unless (-f _) {
    # It's not a plain file!
    if (-d _) {
      # It's a directory, so cannot just unlink it
      system("rm -rf $lockname");
    } else {
      # It's not a plain file nor a directory, so just remove it
      unlink $lockname;
    }
  }
  $fh = new FileHandle($lockname, O_CREAT|O_WRONLY|O_APPEND);
  $fh->close;
  # Quicker to collect them and do 1 big chmod and chown call later.
  push @locknames, $lockname;
}

# Set perms and ownership of /v/s/M/i/Locks to
# drwxr-x--- root run-as-group
chmod 0755, $locksdirname unless $locksdirname =~ /^\/tmp/;
chown -1, $ldgid, $locksdirname;
# Set perms and ownership of /v/s/M/i/Locks/*.lock to
# -rw------- run-as-user run-as-group
chmod 0600, @locknames;
chown $lduid, $ldgid, @locknames;

exit 0;