On Mon, Dec 10, 2007 at 05:54:54PM -0800, Alex Malinovich wrote: > > On Tue, 2007-12-11 at 00:49 +0100, Davide Mancusi wrote: > > Alex Malinovich ha scritto: > > > On Mon, 2007-12-10 at 21:56 +0100, Davide Mancusi wrote: > > >> I would like programs inside a 32-bit chroot to be able to access my > > >> USB webcam, which works fine outside the jail. From the chroot, however, > > >> it does not work out-of-the-box, nor do I know if it is at all possible > > >> to do it. > > > > > > The first thing I'd check is to make sure you that you have /dev > > > and /proc mounted inside the jail. You should have lines similar to this > > > in your /etc/fstab: > > > > > > proc /var/chroot/sid-ia32/proc proc defaults 0 0 > > > /dev /var/chroot/sid-ia32/dev none bind 0 0 > > > > > > (note that the "proc" line does NOT have a / before it) > > > > Interesting. My /etc/fstab looks like this: > > > > /dev /var/chroot/sid-ia32/dev none bind,auto 0 0 > > /proc /var/chroot/sid-ia32/proc none bind,auto 0 0 > > > > However, modifying it as you indicated does not help with the webcam. > > Which version of /etc/fstab is "more correct", now? Binding /proc seemed > > to make sense to me... > > They both work. I prefer to do a regular mount (instead of a bind) > whenever possible, but that's just personal preference. I don't know if > there's any technical reason to do one or the other specifically. > > So I don't really know anything about using a webcam as I don't have one > myself, but just on a hunch I checked through the modules for my kernel, > and I found an interesting one: > > compat_ioctl32.ko > > It caught my eye because it is in kernel/drivers/media/video. I know > that for a brief while when I first moved my system to pure 64-bit, I > had to have an ioctl32 module loaded in order for sound to work within > the chroot. It was something about how the libraries (32-bit) were > talking to the kernel device (64-bit). That ended up getting fixed with > an ALSA update a while ago, but there could be something similar going > on with the webcam.
What happens if you use schroot? I don't have a webcam to try, but schroot handles mounting everything I need; no need for /etc/fstab entries for it. Doug. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
