Re: [log4perl-devel] multiple process, permissions and missing log output

[Kevin M. G. <cp...@go...>]

Martin Evans wrote:
> I think Log::Dispatch::FileRotate is unusable in a multi-process 
> environment if the processes run as different uids. 

That's certainly not impossible.  In a situation like that, I'd
seriously think about talking to a logging daemon like syslog,
syslog-ng, or even something like Spread.  Syslog is *really* flexible,
and you can use Log::Dispatch::Syslog.

But one more suggestion that might help, did you try doing "chmod g+s"
on the directory that holds the log files? Then all files created in
that directory will belong to the group-owner of the directory. This
seems to work for me:

#here's the script:

kgoess@desoto:~ $ cat /tmp/test.pl
use Log::Log4perl;

my $testfile =  '/tmp/testlog/foo.log';

Log::Log4perl->init(\<<EOT);
log4perl.category = INFO, FileAppndr1
log4perl.appender.FileAppndr1          = Log::Dispatch::FileRotate
log4perl.appender.FileAppndr1.filename = $testfile
log4perl.appender.FileAppndr1.mode     = append
log4perl.appender.FileAppndr1.layout   = Log::Log4perl::Layout::SimpleLayout
log4perl.appender.FileAppndr1.size = 1
log4perl.appender.FileAppndr1.max = 6
EOT

my $log = Log::Log4perl::get_logger("");

for (1..1000){
    $log->info("Shu-wa-chi!"x100);
}

#running it produces these files, note the ownership
#and permissions on the directory are g+w and group is me2
kgoess@desoto:~ $ perl /tmp/test.pl
kgoess@desoto:~/temp $ ls -lFtra /tmp/testlog/
total 19
drwxrwxrwt 17 root   root 3072 Feb 28 09:12 ../
-rw-rw-r--  1 kgoess me2  1108 Feb 28 09:12 foo.log.6
-rw-rw-r--  1 kgoess me2  1108 Feb 28 09:12 foo.log.5
-rw-rw-r--  1 kgoess me2  1108 Feb 28 09:12 foo.log.4
-rw-rw-r--  1 kgoess me2  1108 Feb 28 09:12 foo.log.3
-rw-rw-r--  1 kgoess me2  1108 Feb 28 09:12 foo.log.2
-rw-rw-r--  1 kgoess me2  1108 Feb 28 09:12 foo.log.1
-rw-rw-r--  1 kgoess me2  1108 Feb 28 09:12 foo.log
drwxrwsr-x  2 kgoess me2  1024 Feb 28 09:12 ./

#be a different user
kgoess@desoto:~/temp $ sudo su - me2
Password:
[me2@desoto ~]$

#and run it as me2
[me2@desoto ~]$ perl /tmp/test.pl
[me2@desoto ~]$ ls -lFtra /tmp/testlog/
total 19
drwxrwxrwt 17 root   root 3072 Feb 28 09:12 ../
-rw-rw-r--  1 me2    me2  1108 Feb 28 09:15 foo.log.6
-rw-rw-r--  1 me2    me2  1108 Feb 28 09:15 foo.log.5
-rw-rw-r--  1 me2    me2  1108 Feb 28 09:15 foo.log.4
-rw-rw-r--  1 me2    me2  1108 Feb 28 09:15 foo.log.3
-rw-rw-r--  1 me2    me2  1108 Feb 28 09:15 foo.log.2
-rw-rw-r--  1 me2    me2  1108 Feb 28 09:15 foo.log.1
-rw-rw-r--  1 me2    me2  1108 Feb 28 09:15 foo.log
drwxrwsr-x  2 kgoess me2  1024 Feb 28 09:15 ./


The default umask on my machine is 0002, so files are group-writeable by
default.

-- 
Happy Trails . . .

Kevin M. Goess