[Pkg-phototools-devel] Bug#760096: Bug#760096: Acknowledgement (gphoto2: Fails to initialize CanonPowerShot G5 after upgrade from stable)

[Helge Kreutzmann]

Hello Herbert,
On Tue, Jul 26, 2016 at 01:55:10PM -0300, Herbert Fortes wrote:
> 
> > > Can you tell me which mode (normal/PTP) did you use ? 
> > 
> > How do I find out? I just plug the camera in.
> 
> I do not have a camera. But when I plug my
> cell phone I have two options (in the cell
> phone):
> 
>  - media device. Like a pendrive I guess.
>  - camera (PTP))
> 
> 
> Is there something similar in your camera ?

No.

> > > Can you set '--camera MODEL' and see what happens ? It 
> > > will necessary to use '--port' too. 
> > > 
> > > "--list-cameras" (List supported camera models.) and
> > 
> > This "only" gives:
> > helge at samd:~$ gphoto2 --list-cameras | grep G5
> >         »Canon PowerShot G5 (PTP mode)«
> 
> PTP mode is the only way.

Yes, I believe so as well.

> > > "--list-ports" (List supported port devices) can be
> > > a help.
> > 
> > helge at samd:~$ LC_ALL=C gphoto2 -L --camera "Canon PowerShot G5 (PTP mode)" --port "usb:"
> > 
> > *** Error ***
> > An error occurred in the io-library ('Bad parameters'): No error description available
> > *** Error (-2: 'Bad parameters') ***
> 
> Yes, PTP must be set on the device, if possible. Did
> you try '--auto-detect' ? The manpage says it list 
> auto-detected cameras.

As normal user: does not change anything
As root user: works as expected
…
Canon PowerShot G5 (PTP mode)  usb:011,002

> > For debugging messages, please use the --debug option.
> > Debugging messages may help finding a solution to your problem.
> > If you intend to send any error or debug messages to the gphoto
> > developer mailing list <gphoto-devel at lists.sourceforge.net>, please run
> > gphoto2 as follows:
> > 
> >     env LANG=C gphoto2 --debug --debug-logfile=my-logfile.txt -L --camera "Canon PowerShot G5 (PTP mode)" --port usb:
> > 
> > Please make sure there is sufficient quoting around the arguments.
> > 
> > However, I just by chance tried as root:
> > root at samd:~# LC_ALL=C gphoto2 -L
> > There is no file in folder '/'.
> > There is no file in folder '/store_00010001'.
> > There is no file in folder '/store_00010001/MISC'.
> > There is no file in folder '/store_80000001'.
> > 
> > Strange, so it must be a permission problem. Also -P works (as root).
> 
> Did you check /dev/* ? lsusb and ls -l /dev/bus/usb/003/012 (in my case)
> can show the permissions.

Which device in /dev are you looking for?

root at samd:~# lsusb
…
Bus 011 Device 002: ID 04a9:3085 Canon, Inc. PowerShot G5
…

root at samd:~# ls -lh /dev/bus/usb/011/002
crw-rw-r--+ 1 root plugdev 189, 1281 Jul  2 08:39 /dev/bus/usb/011/002

I'm a member:
root at samd:~# grep plugdev /etc/group
plugdev:x:46:helge

(and I can ls the above file as well)

I run strace -eopen as root and as normal user, and the difference
starts here:
open("/sys/bus", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = -1 EACCES (Permission denied)

I tried to chown /sys/bus (and subdirectories) to root:plugdev, but
this does not work :-((

> regards,
> -- Herbert Parentes Fortes Neto (hpfn)



-- 
      Dr. Helge Kreutzmann                     debian at helgefjell.de
           Dipl.-Phys.                   http://www.helgefjell.de/debian.php
        64bit GNU powered                     gpg signed mail preferred
           Help keep free software "libre": http://www.ffii.de/
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