Hi Tobi, On Fri, Apr 10, 2009 at 09:57:30PM +0200, Tobias Oetiker wrote: > Today Sebastian Harl wrote: > > On Tue, Apr 07, 2009 at 10:11:57PM +0200, Sebastian Harl wrote: > > > On Tue, Apr 07, 2009 at 07:35:30PM +0200, Tobias Oetiker wrote: > > > > Today Sebastian Harl wrote: > > > > > $ rrdtool update file.rrd -t ds -- -5:42 && date > > > > > ERROR: file.rrd: illegal attempt to update using time -5 when last > > > > > update > > > > > time is 1239115940 (minimum one second step) > > > > > 1239116951 > > > > > > > > > > Apparently, this feature got lost somewhere on the way. [...] > > The rrdupdate(1) manpage states the following: > > > > N|timestamp:value[:value...] > > > > The data used for updating the RRD was acquired at a certain time. > > This time can either be defined in seconds since 1970-01-01 or by > > using the letter ?N?, in which case the update time is set to be the > > current time. Negative time values are subtracted from the current > > time. [...] > > > > So, I'd expect the following to happen: > > > > When using N:<values>, RRDtool calls time() to get the current time (in > > seconds since the epoch) and uses that as timestamp when storing the > > values. That works fine. > > > > When using 1234567890:<values>, RRDtool uses the given timestamp (in > > seconds since the epoch). That works fine as well. > > > > When using -5:<values>, RRDtool calls time() to get the current time (in > > seconds since the epoch) and subtracts 5 (in this case) from it. The > > result will be used as timestamp when storing the values. That does not > > currently work, but, instead, fails with the error mentioned in the > > example above. > > > > So, now, the question is: Did I misunderstand the manpage? I'm not sure > > how to interpret the last sentence (from the quote above) then and I'd > > appreciate an explanation. Else, did that feature ever exist? If not, > > why is it documented in the manpage? How should it behave in the future? > > I.e., either the manpage or rrdupdate(1) should be fixed ... > > ah ... now I get it ... the -5 should work ... will check ...
Any news on that? Cheers, Sebastian -- Sebastian "tokkee" Harl +++ GnuPG-ID: 0x8501C7FC +++ http://tokkee.org/ Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety. -- Benjamin Franklin
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