[rrd-users] rrdcgi: parameter problem

[Beat Zahnd]

Hello all,

I use rrdcgi in a unusual way. The cgi called from httpd is a shell
script generating some http headers and calling the rrdcgi script:

$ cat pressure_plot.cgi
#!/bin/sh

echo "Pragma: no-cache"
echo "Cache-control: no-cache"
echo "Content-type: image/png"
echo ""

./pressure_plot

pressure_plot is the rrdcgi script which sends the generated image to
stdout:

$ cat pressure_plot
#!/usr/bin/rrdcgi

<RRD::GRAPH -
        --imgformat PNG
        --vertical-label "pressure [mbar]"
        --start <RRD::CV start>
        --end <RRD::CV end>
        --width 705 --height 245
        --logarithmic
        --lower-limit 1.0e-8
        --alt-autoscale
        DEF:p1=../../data/balzers.rrd:pres_1:AVERAGE
        DEF:p2=../../data/balzers.rrd:pres_2:AVERAGE
        DEF:p3=../../data/stabil_ion.rrd:pres:AVERAGE
        LINE2:p1#0000FF:ColdCathode
        LINE2:p2#000000:Pirani
        LINE2:p3#FF0000:Stabil-Ion
>


This fails for QUERY_STRING's with negative arguments
("start=-2h&end=0h") with the following message:

[ERROR: start time: There should be number after '-']

If i change pressure_plot to --start -<RRD::CV start> it works for
QUERY_STRING's with positive arguments.


Thanks and regards,
Beat

-- 
Beat ZAHND
Physics Institute
University of Bern                   phone  +41 31 631 3466
Sidlerstrasse 5                      fax    +41 31 631 4405
CH-3012 Bern (Switzerland)  mailto:beat.zahnd at phim.unibe.ch

       http://www.phim.unibe.ch/rosina/rosina.html
                http://rosetta.esa.int/

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