MTP, libgphoto2 & KFM

[Damon Lynch]

I didn't yet report it as a bug just yet because my understanding of
kframeworks is poor.

kioclient5 ls 'mtp:/Nexus 4/Internal storage/' works, and frees the device.
In other words you can access the device with gphoto2 after running this
command.

Note: Dolphin uses the URI mtp:/device, which looks to me like a bug (it's
missing the second forward slash).

Interestingly, these steps cause Dolphin to fail:
1. Open Dolphin and browse to see the contents of directory "Internal
storage" in the MTP device
2. run this command (for example): kioclient5 ls 'mtp:/Nexus 4/Internal
storage/DCIM'
It works as expected, displaying the contents.
3. Dolphin now fails to browse the MTP device subfolders. Sometimes it
incorrectly displays nothing in the subfolder, whereas at other times it
displays an error "Could not enter folder xyz".

On Sat, Dec 5, 2015 at 7:32 PM, Mark Gaiser <markg85 at gmail.com> wrote:

> On Sat, Dec 5, 2015 at 12:21 PM, Damon Lynch <damonlynch at gmail.com> wrote:
>
>> Hello,
>>
>> I'm developing a FOSS application [1] (Qt 5, python 3.4) that uses
>> libgphoto2 to access cameras and camera-like devices, including smart
>> phones / tablets that connect via MTP.
>>
>> I have noticed that when Dolphin has accessed the contents of an MTP
>> device, libgphoto2 is unable to access the device, even if Dolphin browsing
>> another location e.g. the user's home directory. The device becomes free
>> when Dolphin is closed.
>>
>> To test this, do these steps:
>>
>> 1. To confirm the MTP device is accessible by libgphoto2, plug in an
>> unlocked android 4.0 + phone (for example), and from a terminal execute
>> gphoto2 --list-folders
>>     That should work.
>> 2. Open Dolphin and browse some folders on the phone.
>> 3. Repeat step 1 while Dolphin is open. It fails.
>>
>> I am unaware of a way for the user to do the equivalent of a virtual
>> "unmount" to ask Dolphin/Kdeinit5 via the GUI to relinquish exclusive
>> control of the device. Is there a way, either through the GUI or the
>> command line? GVFS supplies such a feature. I tried solid-hardware unmount
>> udi (supplying the correct UDI), but solid-hardware reported the MTP device
>> 'does not have the interface StorageAccess".
>>
>> Is there a way request kdeinit5 to relinquish exclusive control of the
>> device from python code? It would be great if my application could
>> automatically do a virtual "unmount" of the device so it can access it,
>> without user intervention.
>>
>> Is there a case to be made for KDE applications to provide a virtual
>> "unmount" of MTP and perhaps also PTP devices in its GUI?
>>
>> Thanks.
>>
>> Damon
>>
>> [1] https://code.launchpad.net/~dlynch3/rapid/zeromq_pyqt
>>
>> --
>>
>> http://www.damonlynch.net
>>
>>
> This smells like it should be reported in https://bugs.kde.org/
>
> Anyhow, can you try if the same happens when just using KIO on the command
> line. It would be a command like:
> kioclient5 ls mtp://...
>
> You can get the mtp:// line from dolphin when you where browsing the mtp
> device (press F6 or click in the location bar)
>
> I'm just curious if using the kio command line tool will give you the same
> result.
>



-- 
http://www.damonlynch.net
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