Red Hat Bugzilla – Bug 189936
Access to USB camera only as root user
Last modified: 2007-11-30 17:11:31 EST
Description of problem: I connect a Canon EOS 300D by USB. When trying to access the camera as normal user, I get an error message saying that the USB device could not be opened. When I try this as root, it is working fine though. Version-Release number of selected component (if applicable): gphoto2-2.1.99-8 How reproducible: Always Steps to Reproduce: 1. Connect a digital camera (e.g. Canon EOS 300D) by USB 2. Try "gphoto2 -L" as normal user Actual results: I get the following error message: *** Fehler *** Ein Fehler trat in der IO-Bibliothek auf (»Konnte das USB-Gerät nicht beanspruchen«): Konnte Schnittstelle 0 nicht reservieren (Die Operation ist nicht erlaubt). Stellen Sie sicher, dass kein anderes Programm oder Kernelmodul (z.B. sdc2xx, stv680, spca50x) das Gerät verwendet und Sie Lese- und Schreibrechte für das Gerät haben. *** Fehler (-53: »Konnte das USB-Gerät nicht beanspruchen«) *** Quick translation: "Could not claim USB device: Could not reserve device 0 (operation is not permitted)." ... "Error (-53: Could not claim USB device)" Expected results: Access to the camera. When I invoke "gphoto2 -L" as root, everything is as expected. Additional info: I assume that udev does not set proper rights to the USB device. There is no kind of "gphoto2.rules" file in "/etc/udev/rules.d". I have tried the following lines as "/etc/udev/rules.d/70-gphoto.rules": # Canon EOS Kiss Digital (normal mode) SYSFS{idVendor}=="04a9", SYSFS{idProduct}=="3084", MODE="0666" # Canon EOS Kiss Digital (PTP mode) SYSFS{idVendor}=="04a9", SYSFS{idProduct}=="3099", MODE="0666" After that, gphoto2 was working as expected, even for a normal user.
Can you try gphoto2-2.1.99-10 from rawhide? I did some fixes inside gphoto2 config scripts. Hal takes care of permissions, so this is not a udev rule problem, but probably hal rule problem.
Tried gphoto2-2.1.99-10, but it's still unchanged.
There is a simple mismatch into hal-files from gphoto2-package: /usr/share/hal/fdi/information/20thirdparty/10-camera-libgphoto2.fdi is generated via /usr/lib/libgphoto2/print-usb-usermap --fdi. This command create for every supported camera a entry with <merge key="camera.access_method" type="string">proprietary</merge> but in the hal-policy-file /usr/share/hal/fdi/policy/20thirdparty/90-gphoto-camera-policy.fdi is no match for <match key="camera.access_method" string="proprietary"> defined. Here is a diff with my 90-gphoto-camera-policy.fdi: --- /usr/share/hal/fdi/policy/20thirdparty/90-gphoto-camera-policy.fdi.orig 2006-06-07 15:50:30.000000000 +0200 +++ /usr/share/hal/fdi/policy/20thirdparty/90-gphoto-camera-policy.fdi 2006-06-07 15:50:52.000000000 +0200 @@ -4,7 +4,7 @@ <device> <match key="info.capabilities" contains="camera"> - <match key="camera.access_method" string="libgphoto2"> + <match key="camera.access_method" string="proprietary"> <append key="info.callouts.add" type="strlist">/usr/libexec/gphoto-set-procperm</append> </match> <match key="camera.access_method" string="ptp">
Thanks, I've applied your patch on rawhide. Strange that this was all the time working for me ..
I think your camera runs in ptp-mode. And there is another match in the 90-gphoto-camera-policy.fdi.