[Xymon] Issue with Regex and NORRDDISKS Setting

[Matt Vander Werf]

Hi J.C.,

Adding the '\Z' instead of '$' doesn't seem to work either.

[root@<host> ~]# xymoncmd env | grep NORRD
NORRDDISKS=^/dev|^/var|^/tmpZ


How would I do that shell wrapper launched from tasks.cfg?

I tried to stick it in /etc/sysconfig/xymonlaunch and it came back with an
error message "Ignoring invalid environment assignment 'env FOO=$':
/etc/sysconfig/xymonlaunch" and "xymoncmd[15102]: 2016-03-02
15:55:16.622168 xgetenv: Cannot find value for variable FOO".

Just putting in FOO='$' without the 'env' didn't work either.


Thanks for your help!!

--
Matt Vander Werf

On Wed, Mar 2, 2016 at 3:06 PM, J.C. Cleaver <cleaver at terabithia.org> wrote:

>
> Hmm. Taking a look at the code, there's not really a provision for
> escaping in this manner. And unfortunately, this is parsed in various
> places throughout xymonlaunch (and passed onto the shell).
>
> The only workaround that seems to work properly is substitution prior to
> xymoncmd's reading:
>
> in xymonserver.cfg:
> NORRDDISKS='^(/dev|/tmp|/var)$FOO'
>
> then run:
> env FOO='$' xymoncmd env | grep NORRD
>
>
> You could either place FOO='$' in a shell wrapper launched from tasks.cfg,
> or stick it way up in /etc/sysconfig/xymonlaunch (if you're using the
> RPM).
>
> I'm tempted to try a patch allowing '$$' to mean an unprocessed '$', but
> that might interfere with people who want a shell PID for some reason.
> Alternatively, adding '\' escaping globally in environment files might
> cause other sorts of problems for folks.
>
>
> Alternatively-alternatively, NORRDDISKS='^(/dev|/tmp|/var)\Z' might work
> for you, since this *is* just straight PCRE...
>
>
> -jc
>
>
> On Wed, March 2, 2016 11:23 am, Matt Vander Werf wrote:
> > Hi J.C.,
> >
> > It doesn't seem to be working with or without the escape backslash. It
> > doesn't show up in the env output either way.
> >
> > root@<host> ~]# grep NORRDDISK /etc/xymon/xymonserver.cfg
> > NORRDDISKS="^/dev|^/var|^/tmp$"
> > [root@<host> ~]# xymoncmd env | grep NORRD
> > 2016-03-02 14:18:47.151545 xgetenv: Cannot find value for variable
> > NORRDDISKS=^/dev|^/var|^/tmp
> >
> > [root@<host> ~]# grep NORRDDISK /etc/xymon/xymonserver.cfg
> > NORRDDISKS="^/dev|^/var|^/tmp\$"
> > [root@<host> ~]# xymoncmd env | grep NORRD
> > 2016-03-02 14:17:47.233910 xgetenv: Cannot find value for variable
> > NORRDDISKS=^/dev|^/var|^/tmp
> >
> >
> > When I do it with them grouped together, it gives me the same result:
> >
> > [root@<host> ~]# grep NORRDDISK /etc/xymon/xymonserver.cfg
> > NORRDDISKS="^(/dev|/var|/tmp)$"
> > [root@<host> ~]# xymoncmd env | grep NORRD
> > 2016-03-02 14:20:35.984507 xgetenv: Cannot find value for variable
> > NORRDDISKS=^(/dev|/var|/tmp)
> >
> > Any ideas?
> >
> > Thanks!!
> >
> > --
> > Matt Vander Werf
> >
> > On Wed, Mar 2, 2016 at 11:50 AM, J.C. Cleaver <cleaver at terabithia.org>
> > wrote:
> >
> >>
> >>
> >> On Wed, March 2, 2016 8:31 am, Matt Vander Werf wrote:
> >> > Hello,
> >> >
> >> > Looking at past list e-mails, it is my understanding that the
> >> NORRDDISKS
> >> > setting in xymonserver.cfg allows for PCRE regular expressions. Is
> >> this
> >> > correct? Or does it only allow certain PCRE regular expressions, but
> >> not
> >> > everything?
> >> >
> >> > I ask because I'm experiencing an issue with my NORRDDISKS setting.
> >> >
> >> > I'd like to ignore disks for graphing that have mount points "/tmp",
> >> but
> >> > not ignore disks with mount points that have "tmp" in them, like
> >> > "/tmpscratch".
> >> >
> >> > I noticed that for other disk mount point names that if you just use
> >> > "^/<name>" with no modifiers, then it only ignores disk mount points
> >> with
> >> > only exactly "^/<name>" and not "^/<name><additional text>" or
> >> > "^/<name>/<more name>" (at least from what I can tell).
> >> >
> >> > For example when using:
> >> >
> >> > NORRDDISKS="^/dev|^/tmp|^/var"
> >> >
> >> > It ignores disks with mount points "/dev" and "/var", but also "/tmp"
> >> AND
> >> > "/tmpscratch". But it doesn't look like it ignores "/var/tmp" (at
> >> least
> >> as
> >> > far as I can tell).
> >> >
> >> > I tried using "^/tmp$" and that didn't work either (still ignored both
> >> > names).
> >> >
> >> >
> >> > Any idea what's going on here? Or how this can be done correctly? Is
> >> the
> >> > "$" metacharacter not allowed in this setting?
> >> >
> >> >
> >> > If it's needed, I'm running the latest 4.3.26-1 Terabithia RPM on RHEL
> >> 7.
> >> >
> >> > Thanks for any help!!
> >> >
> >> > --
> >> > Matt Vander Werf
> >>
> >>
> >> Try checking the output of 'xymoncmd env | grep NORRD' ? If the '$' is
> >> not
> >> coming through, it might be getting read in as an attempt at a shell
> >> variable.
> >>
> >> If so, can you try escaping it as \$ instead?
> >>
> >> Alternatively: '^(/dev|/tmp|/var)$'
> >>
> >>
> >> HTH,
> >> -jc
> >>
> >>
> >
>
>
>
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