Re: [gentoo-user] lm_sensors: dependency problem...

[Albert Hopkins <marduk@letterboxes.org>]

On Sun, 2009-08-23 at 09:42 +0200, Jarry wrote:
> Hi,
> 
> I'm trying to install lm_sensors using gentoo-wiki, but I came
> accros some dependency problem:
> ____________________________
> 
> # emerge --pretend lm_sensors
> These are the packages that would be merged, in order:
> Calculating dependencies... done!
> [ebuild  N    ] sys-fs/sysfsutils-2.1.0
> [ebuild  N    ] x11-misc/read-edid-1.4.2
> [ebuild  N    ] sys-apps/lm_sensors-2.10.7  USE="-sensord"
> ____________________________
> 
> What is that x11-misc/read-edid good for? I do not want to pull
> the whole x11 stuff with it, as this is a server with no graphics.
> 

http://bugs.gentoo.org/181029

> Next, I want to use sensord for monitoring, so I modified
> package.use and tried it once more:
> ____________________________
> 
> # echo "sys-apps/lm_sensors sensord" >> /etc/portage/package.use
> # emerge --pretend lm_sensors
> These are the packages that would be merged, in order:
> Calculating dependencies... done!
> 
> emerge: there are no ebuilds built with USE flags to satisfy 
> ">=x11-libs/cairo-1.4.6[svg]".
> !!! One of the following packages is required to complete your request:
> - x11-libs/cairo-1.8.6-r1 (Change USE: +svg)
> (dependency required by "net-analyzer/rrdtool-1.3.8" [ebuild])
> (dependency required by "sys-apps/lm_sensors-2.10.7" [ebuild])
> (dependency required by "lm_sensors" [argument])
> ____________________________
> 
> Now I do not understand it at all. Why rrdtool? All I want
> to use sensord for is to have some status messages recorded
> to syslog. Why should I install that x11-libs/cairo graphics
> library and rrdtool stuff???

Likely sensord does a lot more than recording to syslog.

rrdtools is used as a database but also used to build graphs from its
database, which probably explains cairo.  Cairo is a graphics library
that can render to multiple devices including X11.

If you want you can submit a patched ebuild for rrdtool that maybe uses
a cairo USE flag and clearly separates the graphics system from the
database system.  You'll probably need to work closely with upstream for
that.

If you want you can submit a patched ebuild for cairo that maybe uses an
X use flag that clearly separates the X11 rendering backend from the
others.  You'll probably need to work closely with upstream for that.

-a