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Bug#961909: ghostscript: PDFA_def.ps references srgb.icc with relative path



Hi Josch,

Quoting Johannes 'josch' Schauer (2020-05-31 11:48:01)
> using /usr/share/ghostscript/9.27/lib/PDFA_def.ps I can convert a PDF
> into PDF/A-1b like so:
> 
>     $ env --chdir=/usr/share/color/icc/ghostscript/ gs -dBATCH -dNOPAUSE \
>     > -dSAFEGR -dPDFA=1 -sProcessColorModel=DeviceRGB -dPDFACompatibilityPolicy=1
>     > -sDEVICE=pdfwrite -sOutputFile=/tmp/out.pdf \
>     > /usr/share/ghostscript/9.27/lib/PDFA_def.ps \
>     > in.pdf
> 
> Using "env --chdir" as well as using an absolute path for OutputFile is
> necessary because PDFA_def.ps references srgb.icc with a relative path
> in /usr/share/color/icc/ghostscript/ -- this means that unless the
> command is executed in /usr/share/color/icc/ghostscript/, PDFA_def.ps is
> useless and must be edited to contain the right absolute path to
> srgb.icc.
> 
> I propose to either:
> 
>  - move PDFA_def.ps to /usr/share/doc/*/examples because it's a file
>    that cannot be used immediately but has to be edited first
> 
>  - patch PDFA_def.ps to include the full path to
>    /usr/share/color/icc/ghostscript/srgb.icc so that it can be used from
>    any directory

Good catch!

Indeed libgs9 ships with a few files arguably usable only as examples:

/usr/share/ghostscript/9.27/lib/PDFA_def.ps
/usr/share/ghostscript/9.27/lib/PDFX_def.ps

The files document both inline and in VectorDevices.htm that they should 
be edited before use.

I am hesitant to moving or patching those files, though, because (as you 
demonstrate above) it _is_ possible with some path juggling to use those 
files as-is, and both upstream and consuming code might rely on the 
files.  Even if never used for anything as examples, I see no harm in 
leaving the files where they are just to be on the safe side.

More sensible to me would be to symlink the files to 
.../doc/libgs9/examples to advertise them as usable as such.

How do you think about my alternative approach?


Kind regards,

 - Jonas

-- 
 * Jonas Smedegaard - idealist & Internet-arkitekt
 * Tlf.: +45 40843136  Website: http://dr.jones.dk/

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