[syslog-ng] Transform file path

[Alexey Vlasov]

Hi,

I intend to manage the distribution of the Apache log-files for each
virtualhost using syslog-ng.

I write the following in Apache vhost configue:

<VirtualHost *>
    SetEnv V3WUSER w_test-l26-apache-_b8649b
    LogFormat "%{V3WUSER}e %h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" xcombined
    CustomLog /var/log/apache_aux2_worker2/access_pipe.log xcombined
</IfModule>

as a result I get this kind of format of the log file: 

w_test-l26-apache-_b8649b 10.0.2.24 - - [24/May/2016:12:41:33 +0300]
"GET / HTTP/1.1" 200 - "http://example.com/" "ELinks (0.11.7; Linux 3.14.46-1gb-csm x86_64; 158x45)"

where the first field is the unique identifier of the virtualhost.

Next step I write the following in syslog-ng: 

source src_apache_piped_logs {
    pipe("/var/log/apache_aux2_worker2/access_pipe.log"
    keep_timestamp(no));
};

destination dst_apache_piped_logs {
    file("/var/log/virtwww/${V3WUSER}/access.log"
    template("$MSGONLY\n") template-escape(no));
};

log {
    source(src_apache_piped_logs); destination(dst_apache_piped_logs);
};

Сonsequently I would like to have each log file of the virtualhost
placed in its own catalog and the path should contain the first field of
the message  (${V3WUSER} = w_test-l26-apache-_b8649b)

Is it actually possible?
Thanks in advance for the help.