Re: dpkg-buildpackage modifying *png file

[Niels Thykier <niels@thykier.net>]

Weatherby,Gerard:
> I'm using dpkg-buildpackage -b -uc -us to prepare a *deb package for a private repository.
> 
> It seems to be modifying a byte PNG image file, as indicated by "cmp"
> 
> ./relax/docs/html/icons/index.png ./debian/relax/usr/software/relax/docs/html/icons/index.png differ: byte 82, line 3
> 
> My debian/install file looks like:
> relax /usr/software
> 
> ?I'd appreciate a hint as to what's going on.
> 
> 
> [...]

Hi,

I suspect it is not dpkg-buildpackage but the tools run from
debian/rules.  If you use the minimal debian/rules based on dh, then it
will run "dh_strip_nondeterminism" which among other will attempt to
normalize metadata in png files.

Assuming my guesses are correct so far, you can disable
dh_strip_nondeterminism by inserting an empty override for it.  Assuming
no existing override, this should be as simple as:

  echo "# Disable dh_strip_nondeterminism" >> debian/rules
  echo "override_dh_strip_nondeterminism:" >> debian/rules

Thanks,
~Niels