[Pkg-phototools-devel] Bug#690035: gphoto2: Wrong date and time stamp on downloaded images

[Alexander Prokoshev]

Package: gphoto2
Version: 2.5.11-1
Followup-For: Bug #690035

Dear Maintainer,
I've found that gphoto2 incorrectly sets file timestamps when getting files from my Canon EOS
1300D camera. This lead me to short experiment: I made a shot and looked at it with gphoto2.

My setup:
1) Canon EOS 1300D with TZ set to "Paris" with DST enabled.
2) Debian Stretch with TZ set to CEST (DST enabled).
3) The shot had been taken at 23:43:14 local time.

The following shows a problem with a communication between gphoto2 and the cam or a problem
with the cam's firmware handling of shots' metadata:

root at server:/# date
Sat Jun  2 23:45:38 CEST 2018
root at server:/# gphoto2 --get-config /main/settings/datetime
Label: Camera Date and Time                                                    
Type: DATE
Current: 1527975994
Printable: Sat Jun  2 23:46:34 2018
Help: Use 'now' as the current time when setting.

root at server:/# gphoto2 --list-files
There is no file in folder '/'.                                                
There is no file in folder '/store_00020001'.
There is no file in folder '/store_00020001/DCIM'.
There is 1 file in folder '/store_00020001/DCIM/100CANON'.
#1     IMG_0419.JPG               rd  2769 KB image/jpeg
There is no file in folder '/store_00020001/MISC'.
root at server:/# gphoto2 --show-info 1
Information on file 'IMG_0419.JPG' (folder '/store_00020001/DCIM/100CANON'):   
File:
  Mime type:   'image/jpeg'
  Size:        2834984 byte(s)
  Downloaded:  no
  Permissions: read/delete
  Time:        Sun Jun  3 01:43:14 2018
Thumbnail:
  Mime type:   'application/x-unknown'
Audio data:
  None available.
root at server:/#


We see the file's timestamp is exactly 2 hours ahead the moment is had been taken which matches an offset between
CEST with DST and UTC.

I am not quite sure if this is gphoto's timestamp handling problem or the firmware's timestamping problem.

-- System Information:
Debian Release: 9.3
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-5-amd64 (SMP w/4 CPU cores)
Locale: LANG=ru_RU.utf8, LC_CTYPE=ru_RU.utf8 (charmap=UTF-8), LANGUAGE=ru_RU.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gphoto2 depends on:
ii  libaa1             1.4p5-44+b1
ii  libc6              2.24-11+deb9u1
ii  libcdk5            5.0.20161210-1
ii  libexif12          0.6.21-2+b2
ii  libgphoto2-6       2.5.12-1
ii  libgphoto2-port12  2.5.12-1
ii  libjpeg62-turbo    1:1.5.1-2
ii  libncurses5        6.0+20161126-1+deb9u1
ii  libpopt0           1.16-10+b2
ii  libreadline7       7.0-3

gphoto2 recommends no packages.

Versions of packages gphoto2 suggests:
pn  gthumb  <none>

-- no debconf information