Re: Reproducible PDF output

[Pablo Rodriguez <oinos@gmx.es>]

On 11/11/2017 08:39 AM, N. Raghavendra wrote:
> I would like to have reproducible PDF output from ConTeXt documents.  I
> tried the suggestions at https://tex.stackexchange.com/a/313605/146025
> but they did not work.  The PDF output has information like
> "ConTeXt.Time", "CreateDate", etc., which depend on the time the source
> was processed at.  How do I suppress such temporal information, that is
> not supplied by the author, from the PDF output?

Hi Raghu,

"contextjit  --nodates" is your friend here.

No \pdf* commands are required.

I hope it helps,

Pablo


> Here are my two attempts:
> 
> ----------------------------------------------------------------------
> $ cat example.tex
> 
> \pdfinfoomitdate=1
> \pdftrailerid{}
> 
> \starttext
> 
> Hello, world!
> 
> \stoptext
> 
> $ ( context example.tex && cp example.pdf a && sleep 1 && \
>     context example.tex && cp example.pdf b ) > /dev/null && \
>     md5sum a b
> 
> 6a4ac7122bb502062e7ea87be52df166  a
> cac1ab3160003526e49da135d77e4eda  b
> ----------------------------------------------------------------------
> 
> ----------------------------------------------------------------------
> $ cat example.tex
> 
> \pdfvariable suppressoptionalinfo \numexpr
>         0
>     +   1   % PTEX.FullBanner
>     +   2   % PTEX.FileName
>     +   4   % PTEX.PageNumber
>     +   8   % PTEX.InfoDict
>     +  16   % Creator
>     +  32   % CreationDate
>     +  64   % ModDate
>     + 128   % Producer
>     + 256   % Trapped
>     + 512   % ID
> \relax
> 
> \starttext
> 
> Hello, world!
> 
> \stoptext
> 
> $ ( context example.tex && cp example.pdf a && sleep 1 && \
>     context example.tex && cp example.pdf b ) > /dev/null && \
>     md5sum a b
> 
> 2116aeec2b5bed2bfd02d16332700758  a
> 3204a1a127f139da8d960037a8ba0690  b
> ----------------------------------------------------------------------
> 
> Here is the reason I want reproducible builds.  I keep the source of my
> ConTeXt documents under version control.  I also keep their PDF output
> under version control because I often find, several years after a
> document was written, that I don't have the supporting files needed to
> process it; in such a case, until I get the missing supporting files, I
> can at least view the PDF output.  Now, even when the source has not
> changed, if I run context on it, the PDF output changes, and the version
> control system reports the PDF file as modified.  In such a situation, I
> have to register the change in the version control system, or revert the
> PDF file to its version.  I would like to avoid this extra work.
> 
> Thanks and regards,
> Raghu.
> 
> --
> N. Raghavendra <raghu@hri.res.in>, http://www.retrotexts.net/
> Harish-Chandra Research Institute, http://www.hri.res.in/
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