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Meaning of exit code 150

Added by Romain D. over 7 years ago

Hello,

I want to extract thumbnail from an image, so I ran:

$ exiv2 -v -e t DSC00639.JPG 
File 1/1: DSC00639.JPG
Writing thumbnail (image/jpeg, 10646 Bytes) to file ./DSC00639-thumb.jpg

Thumbnail is correctly extracted and I can open it, but the exit code of exiv2 is 150.
I didn't find any doc about exit codes for exiv2. What does 150 mean, and why exit code isn't 0?

Thanks.


Replies (4)

RE: Meaning of exit code 150 - Added by Robin Mills over 7 years ago

I can explain this. The return value is the length of the thumbnail % 256 (% is the integer modulus operator)

$ del ~/temp/img*thumb.jpg ; exiv2 -v -e t ~/temp/img_4697.jpg ; echo $? ; ls -alt ~/temp/img*thumb.jpg
File 1/1: /Users/rmills/temp/img_4697.jpg
47
-rw-r--r--+ 1 rmills  staff  6191 24 Aug 20:45 /Users/rmills/temp/img_4697-thumb.jpg
$ perl -e 'print( eval("6191 % 256") . "\n")'
47
$ 

I didn't write Exiv2, so I cannot explain why the code has been constructed to return this value. However this is the explanation. In your case, you get a return value of 150 because the length of your preview is different from my image.

Robin

RE: Meaning of exit code 150 - Added by Romain D. over 7 years ago

Ok, thanks Robin for your explanation.

But I think passing this information via exit code is not a good idea, since some tools (make in my case) break if exit code isn't 0. I have to do a dirty thing like

exiv2 -v -e t $? || exit 0
to workaround this.

RE: Meaning of exit code 150 - Added by Robin Mills over 7 years ago

Romain

My aim in life is to make and keep everybody happy. So, here's what I suggest. Please raise a bug on this matter and mention this topic (1602). Andreas, whom I believe wrote this code, can do one of the following:

1) Reject the bug with a justification for the current behaviour
2) Fix it
3) Assign to me to be fixed
4) Nothing

The fix could be as simple as a tiny change in preview.cpp lin3 1082: function PreviewImage::writeFile()
Change
return Exiv2::writeFile(buf, name);
to
return Exiv2::writeFile(but,name)?0:EOF;

If Andreas does nothing, I will fix this for our 0.25 release which is expected around December 2013. It's OK for you to ping me in a month if you see no progress.

Robin

RE: Meaning of exit code 150 - Added by Robin Mills over 7 years ago

Romain

Thanks for submitting the bug report. http://dev.exiv2.org/issues/918

Robin

    (1-4/4)