On Mon, 3 Jan 2005 18:14, John Layt wrote: > > Making some progress on LinuxQuestions there's this page: > http://www.linuxquestions.org/hcl/showproduct.php?product=560 > which points to > http://digikam.free.fr/hotplug/howto.html > but it appears a little outdated in places. I'll see what I can learn from > the scripts provided and follow up later. > > john.
Eureka! Got it! Between those links, and actually installing GTkam to see what files it played with, I've figured out the secret to Mandrakes hot-plugging :-) I'll write it up in full later as a step-by-step process once I have it down pat (yes Anne, and add it to the TWiki :-), but for now here's a high-level description of how stuff is linked in together from one script to the next to the next to the next... You plug in the usb camera/scanner/whatever, the kernel doesn't recognise it as something it has a kernel module for, so passes it on to Hotplug to figure out what to do. Hotplug gets the device details from the device, which includes the device id number and the device class, which is 'camera' for a camera, 'scanner' for a scanner, etc. Next hotplug looks up the device id in the file /etc/hotplg/usb.usermap to see if it's something it knows what to do with. In the case of cameras, libgphoto2 has added to the usermap all the cameras that it supports, and tells hotplug to run the script /etc/hotplug/usb/usbcam. Scanners are added to the usermap by libsane and points to the script /etc/hotplug/usb/libusbscanner and so on. When these scripts are run, they do whatever initialisation is required, such as creating the usb device file (/dev/usb/whatever) and setting the required permissions on it, or downloading a required firmware to the device. Mandrake has added Mandrake specific parts to the camera initialisation file to perform the autorun stuff by calling the script /etc/dynamic/scripts/camera.script and passing it the device file to use. The scanner scripts libusbscanner and scanner.script are provided by libsane and as standard call the autorun stuff. These files do more distribution specific setup work before calling yet another script, depending on the device class and the currently running desktop, to launch the required program (no, not there yet!). These scripts are kept in folders aclled /dynamic/launchers/device_class, such as /dynamic/launchers/camera or /dynamic/launchers/scanner. In each of these folders are files kde.desktop and gnome.desktop which are .desktop files describing which program to autorun under that particular desktop. In the case of Mandrake, these are actually symbolic links to the /etc/alternatives directory, which is the standard location for defining default applications such as your default browser. For cameras, kde.desktop points to /etc/alternatives/camera.kde.dynamic, likewise for gnome. But it doesn't end there, camera.kde.dynamic is also a symbolic link back to /etc/launchers/camera/gtkam.desktop! Finally, we've reached the actual file that runs gtkam! So, in short for a digital camera: 1) Plug in camera 2) Look camera up in /etc/hotplg/usb.usermap 3) Run init script /etc/hotplug/usb/usbcam to create /dev/usb entry and call 4 4) Run /etc/dynamic/scripts/camera.script with the /dev/usb entry and call 5 5) If under KDE, run /dynamic/launchers/camera/kde.desktop which points to 6 6) Run /etc/alternatives/camera.kde.dynamic which points to 7 7) Run /etc/launchers/camera/gtkam.desktop So the quick hack will be to edit /etc/launchers/camera/gtkam.desktop to actually call kaffeine instead of gtkam :-) Unfortunately, I've loaned my digital camera to my brother for his honeymoon, so I can't confirm it works, but if you care to try, as root edit the file so the contents appear as follows: [Desktop Entry] Name=digikam Comment=Digital Camera Program TryExec=/usr/bin/digikam Exec=/usr/bin/digikam Terminal=false Icon=digikam.png Type=Application Let me know if this works for now. The proper course will be to uninstall gtkam, create /etc/launchers/camera/digikam.desktop, and create the other required symbolic links. I'll experiment and detail that later. John. ----------------------------------------------------------------------------- Forget that new hard drive, save some lives instead, donate to the Red Cross: USA: https://www.redcross.org/donate/donation-form.asp UK: https://www.donate.bt.com/bt_form_dec.htm Oz: https://www.redcross.org.au/Donations/onlineTsunamiDonations.asp NZ: https://www.banqonit.com/proxypage.aspx?boiid=205
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