[Bug 1175947] Re: gvfs-copy --preserve doesn't work with MTP devices

[Andrew Wilkinson]

I recently upgraded from Ubuntu 15.04 to Ubuntu 15.10 beta 2.

After doing a package upgrade on 30 September 2015 I noticed that the
gvfs package updated.

I have now tested transferring files via USB from my Samsung Galaxy Note
4 phone to my Ubuntu 15.10 desktop and I am pleased to report that the
timestamp  is correctly preserved.

I should add that it has been a very frustrating long wait (over two
years), for this critical bug to be fixed.  Such a long delay is
potentially damaging to Ubuntu as bugs of this nature should receive top
priority.  Mobile phones and tablets are now a way of life and it is
simply unacceptable to lose the date information on a file that is
transferred from a phone to a PC - it is a form of "data corruption".

I am grateful to the software developers who fixed the bug in time for
the release of Ubuntu 15.10.

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Title:
  gvfs-copy --preserve doesn't work with MTP devices

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[Bug 1175947] Re: gvfs-copy --preserve doesn't work with MTP devices

[Andrew Wilkinson]

I'm sorry to read that the fix does not yet work in all cases.

Following on from my previous post:

I am using Ubuntu 15.10 beta2 followed by recent apt-get dist upgrade on +-30 
September 2015.
The gvfs package updated to:   gvfs_1.24.2-0ubuntu1_amd64.deb

I have tested the following three android devices:

Samsung Galaxy Note 4 SM-N910F (running Android 5.1) 
Samsung Galaxy S4 i9500 (running Android 5.0.1) 
Samsung Galaxy Note 10.1 2014 SM-P601 (running Android 4.4.2)

I performed the following tests via usb:

(1) Copying files from phone to Ubuntu laptop (RESULT: timestamp preserved)
(2) Copying files from Ubuntu laptop to phone (RESULT: *** timestamp NOT 
preserved ***) 

(3) Copying files from phone to Windows 7 (RESULT: timestamp preserved)
(4) Copying files from Windows 7 to phone (RESULT: timestamp preserved) 

All three android devices behave in the same way.

It is weird that timestamps are properly preserved in both directions for 
Windows 7,
yet timestamps are only preserved in one direction for Ubuntu (with gvfs 
1.24.2).

The previous post suggested that there are problems relating to lack of
support from Google android developers  (and that is why it is difficult
for Linux developers to fix).

Why then does it work properly for Windows if it is an Android problem?

Clearly the problem is only partially solved for Ubuntu.

It is still a serious problem if transferring files from Ubuntu to the phone 
destroys timestamps.
Please, can someone fix this problem or contact someone who can!  (for the sake 
of Linux!!!)

(But I am still delighted that I can now move my photos & videos  from
my phone to my laptop without timestamp corruption.  The problem was
more serious for videos as it appears that no date information is stored
inside the mp4 file; for jpg images, the date is stored inside the
file).

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https://bugs.launchpad.net/bugs/1175947

Title:
  gvfs-copy --preserve doesn't work with MTP devices

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