[Nut-upsuser] UPS/NUT with openSUSE 13.1

[Rob Groner]

Well, I've spent a couple hours on this, unable to figure it out.  I removed the libusb-compat-devel package using zypper.  And I've downloaded, built, and installed libusb from sourceforge.  But trying to configure nut now I get "USB drivers requested, but libusb not found", no matter what I put for --with-usb-libs.  Continuing to flog away at it...


Rob Groner
Software Engineer Level II

RTD Embedded Technologies, Inc.
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-----Original Message-----
From: Charles Lepple [mailto:clepple at gmail.com] 
Sent: Thursday, September 17, 2015 9:13 AM
To: Rob Groner <rgroner at RTD.com>
Cc: Roger Price <roger at rogerprice.org>; nut-upsuser Mailing List <nut-upsuser at lists.alioth.debian.org>
Subject: Re: [Nut-upsuser] UPS/NUT with openSUSE 13.1

On Sep 15, 2015, at 9:31 PM, Charles Lepple <clepple at gmail.com> wrote:
> 
>> Trying to track down the source of the problem, I checked Yast to make sure I had at least 0.1.8 version for libusb.  I saw this (attached photo).  Is it then actually using –compat instead of the “real” libusb?  And is that a problem?
> 
> You're right, both the -compat and real libusb packages will use the same libusb-0.1.so* name.

I misspoke.

The "real libusb" (0.1) and libusb-compat will both get linked with "-lusb". The package management system is free to implement that with symlinks to the actual files.

The confusing part is that openSUSE seems to be adopting the 0.1.1x numbering scheme for libusb-compat so that the package looks newer (0.1.13) than the real libusb-0.1.12:

   https://build.opensuse.org/package/view_file/openSUSE:13.2/libusb-compat/libusb-compat.spec?expand=1

Note the changes mentioned in the return codes for usb_detach_kernel_driver_np():

   https://build.opensuse.org/package/view_file/openSUSE:13.2/libusb-compat/libusb-compat.changes?expand=1

Those are the sort of edge cases that haven't been fully tested with NUT. It seems like the path from NUT driver through libusb to the kernel is relatively unchanged with libusb-compat, but that mapping the errors back to root cause will depend on the exact version of libusb-compat in use (and potentially, the kernel version as well).

I would recommend retesting with an explicit "killall usbhid-ups" (and anything else necessary to stop NUT background services, otherwise it will pop back up) before switching debug flags on.

If that fails to turn up anything conclusive, you might try to install libusb-0.1.12 from source in a separate directory, and explicitly point ./configure to that tree:

<remove libusb-compat-devel>

install from http://sourceforge.net/projects/libusb/files/libusb-0.1%20%28LEGACY%29/0.1.12/

.../libusb-0.1.12 $ ./configure --prefix=$HOME/local/libusb-0.1 && make && sudo make install

.../nut $ ./configure --with-usb-include=$HOME/local/libusb-0.1/include --with-usb-libs=-L$HOME/local/libusb-0.1/lib ...

(might need slight adjustments)

After that, you can verify that the libusb line in "ldd /path/to/usbhid-ups" points to "$HOME/local/..."

-- 
Charles Lepple
clepple at gmail