qpsmtpd/log/watch

#!/usr/bin/perl

use strict;
use warnings;

$|++;   # OUTPUT_AUTOFLUSH

use Cwd;
use Data::Dumper;
use File::Tail;

my $dir = get_qp_dir() or die "unable to find QP home dir";
my $file = "$dir/log/main/current";
my $fh = File::Tail->new(name=>$file, interval=>1, maxinterval=>1, debug =>1, tail =>300 );

while ( defined (my $line = $fh->read) ) {
    my (undef, $line) = split /\s/, $line, 2; # strip off tai timestamps
    print $line;
};

sub get_qp_dir {
    foreach my $user ( qw/ qpsmtpd smtpd / ) {
        my ($homedir) = (getpwnam( $user ))[7] or next;

        if ( -d "$homedir/plugins" ) {
            return "$homedir";
        };
        foreach my $s ( qw/ smtpd qpsmtpd qpsmtpd-dev / ) {
            if ( -d "$homedir/$s/plugins" ) {
                return "$homedir/$s";
            };
        };
    };
    if ( -d "./plugins" ) {
        return Cwd::getcwd();
    };
};