Re: [gentoo-user] Re: Regular user can't mount/unmount mtpfs; root is OK

[Mark David Dumlao]

On Fri, Jul 25, 2014 at 11:49 AM, walt <w41ter@×××××.com> wrote:

> On 07/23/2014 09:59 PM, Walter Dnes wrote:
> >   I sent this a day or 2 ago, but it doesn't show up on the list for me.
> > Apologies to anyone seeing a duplicate.
> >
> >   I'm a total noobie at mtpfs/FUSE.  My "excellent adventure" started
> > yesterday when I got a clearout 7" tablet, and took a sample photo, and
> > tried mounting the tablet... no /dev/sdb to be found anywhere.  I went
> > to "Mr. Google" for help, and found out that MTP is the "new and
> > improved" way of doing things.  So I installed mtpfs.  It works great
> > for root, but a regular user can't mount the tablet.  The mtpfs command
> > immediately returns to the command prompt, with no error message or any
> > other info.  The tablet is not mounted...
> >
> > [d531][waltdnes][~] mtpfs ~/tablet
> > [d531][waltdnes][~]
> >
> >   Before anyone asks...
> >
> > 1) Yes, I have enabled FUSE in the kernel.  At first I hadn't, but I got
> > a big red warning when I tried compiling mtpfs.  I tweaked and rebuilt
> > the kernel, and rebooted, then built mtpfs.
> >
> > 2) Yes, I am a member of plugdev...
> >
> > [d531][root][~] grep plugdev /etc/group
> > plugdev:x:247:waltdnes,user2
> >
> > 3) This PC uses mdev rather than udev.  Could that be the problem?
> >
> >   I've figured out a kludge to get around it.  This involves issuing a
> > few commands as root.  I've added them into a file in /etc/sudoers.d/
> > but I'd really rather prefer a cleaner solution.
> >
> > [d531][root][~] mtpfs -o allow_other /home/waltdnes/tablet
> > Device 0 (VID=0bb4 and PID=2008) is UNKNOWN.
> > Please report this VID/PID and the device model to the libmtp
> development team
> > Android device detected, assigning default bug flags
> >
> >    When I was finished, I tried...
> >
> > [d531][waltdnes][~] fusermount -u tablet
> > fusermount: entry for /home/waltdnes/tablet not found in /etc/mtab
> >
> >   I had to unmount as root...
> >
> > [d531][root][~] fusermount -u /home/waltdnes/tablet
> >
> >   I experienced similar problems with simple-mtpfs, so that's not a
> > solution either.  Any ideas?
>
> I vaguely remember suffering through the same problem when I bought my
> Nexus7
> tablet from google about a year ago.  (My memories now are a bit fuzzy.)
>
> I believe I had to add this file manually:
>
> #cat /etc/udev/rules.d/51-android.rules
>
> SUBSYSTEM=="usb",ATTRS{idVendor}=="18d1",ATTRS{idProduct}=="4e41",MODE="0666",OWNER="wa1ter"
>
> I harvested those hex numbers from running "lsusb -v" IIRC.
>
>
The idea behind w41ter's plan is to make sure that the device file
corresponding to the mtp device is read-writable by the user running mtpfs.

You mentioned that you are a member of the plugdev group, but does the
plugdev group actually get ownership of the mtp device? This is something
you'll have to investigate in your mdev rules.




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