Exiv2

Thomas

This warning in written to errout when a class of metadata (such as Xmp) is empty. We also set the return code to 253 (-3). There was a complaint that we were setting a non-zero code without a warning. So in v0.25, when we set the non-zero return value,_* we also*_ report the warning. This is the behaviour you describe.

702 rmills@rmillsmbp:~/gnu/exiv2/v0.25 $ curl --silent -O http://clanmills.com/Stonehenge.jpg
703 rmills@rmillsmbp:~/gnu/exiv2/v0.25 $ exiv2 -px  Stonehenge.jpg | wc # how many lines of Xmp metadata?
       3      14     238
704 rmills@rmillsmbp:~/gnu/exiv2/v0.25 $ exiv2 -dx Stonehenge.jpg # delete the Xmp metadata
705 rmills@rmillsmbp:~/gnu/exiv2/v0.25 $ exiv2 -px  Stonehenge.jpg | wc
Stonehenge.jpg: (No XMP data found in the file)
       0       0       0
706 rmills@rmillsmbp:~/gnu/exiv2/v0.25 $ exiv2 -px Stonehenge.jpg # print the Xmp metadata
Stonehenge.jpg: (No XMP data found in the file)
707 rmills@rmillsmbp:~/gnu/exiv2/v0.25 $ echo $?
253
708 rmills@rmillsmbp:~/gnu/exiv2/v0.25 $ exiv2 -pa Stonehenge.jpg > /dev/null # ignore the output
Stonehenge.jpg: (No XMP data found in the file)  # message on errout
709 rmills@rmillsmbp:~/gnu/exiv2/v0.25 $ echo $? # what's the return value?
253
710 rmills@rmillsmbp:~/gnu/exiv2/v0.25 $ exiv2 -pie Stonehenge.jpg > /dev/nul # print IPTC and Exif tags 
711 rmills@rmillsmbp:~/gnu/exiv2/v0.25 $ echo $? # what's the return value
0
712 rmills@rmillsmbp:~/gnu/exiv2/v0.25 $ 

There are at least a couple of ways to avoid the warning:

1. ignore errout $ exiv2 -pa image... 2>/dev/null
2. don't ask exiv2 for Xmp $ exiv2 -pie image...

Hi,

Thanks to you. You learnt me a lot of things.
I decided to simply use

exiv2 … 2> /dev/null

like you suggest me and it works fine.