Reproducible PDF output not working

Reproducible PDF output not working

[N. Raghavendra]

Sometime ago, I asked here about reproducible PDF output, and was told
about the --nodates option of context.  It worked then, but doesn't seem
to be working now, with a recent version of context.

----------------------------------------------------------------------
$ cat foo.tex

\starttext

Hello, world!

\stoptext

$ ( rm -f a b foo.log foo.pdf foo.tuc && \
    context --nodates foo.tex && cp foo.pdf a && \
    sleep 1 && \
    context --nodates foo.tex && cp foo.pdf b ) > /dev/null && \
    md5sum a b

bdd1911005623a519f5ecb3dbcb8bc7b  a
06157e2840c0758ca46d5e7f0be239ef  b

$ context --version
[elided]
mtx-context     | current version: 2018.04.19 15:53
----------------------------------------------------------------------

File `a' has the words "<pdfx:ID>foo.2018-04-24T01:49:47-19:00</pdfx:ID>",
and file `b' has "<pdfx:ID>foo.2018-04-24T01:49:49-19:00</pdfx:ID>" at
the corresponding position.

Please tell me how to ensure that the PDF output depends only on the
source, and not on the time the output is generated.

Thanks,
Raghu.

--
N. Raghavendra <raghu@hri.res.in>, http://www.retrotexts.net/
Harish-Chandra Research Institute, http://www.hri.res.in/
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Reproducible PDF output not working

[Arthur Reutenauer]

	Hi Raghu,

  I can reproduce the problem you observe.  Hans, it seems the
identifier uses the time of compilation, when it should probably use the
time of last modification of the source file.

	Best,

		Arthur
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Reproducible PDF output not working

[N. Raghavendra]

At 2018-04-23T23:49:19+02:00, Arthur Reutenauer wrote:

> it seems the identifier uses the time of compilation, when it should
> probably use the time of last modification of the source file.

Yes, with the 2018.04.19 version, the identifier in the output of
`context --nodates' includes the compilation time, as in

  <pdfx:ID>foo.2018-04-24T01:49:47-19:00</pdfx:ID>.

On the other hand, with the 2017.11.14 version, the identifier in the
output of `context --nodates' is just

  <pdfx:ID>foo</pdfx:ID>

Raghu.

PS: Incidentally, what is the "-19:00" in date in the first identifier?
In my time zone, IST, I would have expected 2018-04-24T01:49:47+05:30.

--
N. Raghavendra <raghu@hri.res.in>, http://www.retrotexts.net/
Harish-Chandra Research Institute, http://www.hri.res.in/
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Reproducible PDF output not working

[Hans Hagen]

On 4/24/2018 6:28 AM, N. Raghavendra wrote:
> At 2018-04-23T23:49:19+02:00, Arthur Reutenauer wrote:
> 
>> it seems the identifier uses the time of compilation, when it should
>> probably use the time of last modification of the source file.
> 
> Yes, with the 2018.04.19 version, the identifier in the output of
> `context --nodates' includes the compilation time, as in
> 
>    <pdfx:ID>foo.2018-04-24T01:49:47-19:00</pdfx:ID>.
> 
> On the other hand, with the 2017.11.14 version, the identifier in the
> output of `context --nodates' is just
> 
>    <pdfx:ID>foo</pdfx:ID>
> 
> Raghu.
fixed in beta but no beta soon ... in lpdf-ini.lua you can try to fix this

     function lpdf.id(date)
         local banner = environment.jobname or tex.jobname or "unknown"
         if not date then
             return banner
         else
             return format("%s | %s",banner,timestamp)
         end
     end


and then run context --make

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Reproducible PDF output not working

[Arthur Reutenauer]

> On the other hand, with the 2017.11.14 version, the identifier in the
> output of `context --nodates' is just
> 
>   <pdfx:ID>foo</pdfx:ID>

  The longer identifier is definitely better, but it should be possible
to make it predictable over successive runs.

> PS: Incidentally, what is the "-19:00" in date in the first identifier?
> In my time zone, IST, I would have expected 2018-04-24T01:49:47+05:30.

  I remember noticing something strange in the date format when files
were compiled after midnight local time while the UTC time was before
midnight.  It didn’t seem enough to send a bug report at the time, but I
can look into it again.

  And thanks to Hans for his speedy response, as usual :-)

	Best,

		Arthur
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Reproducible PDF output not working

[N. Raghavendra]

At 2018-04-24T09:44:09+02:00, Hans Hagen wrote:

> fixed in beta but no beta soon ... in lpdf-ini.lua you can try to fix
> this

Thank you for the solution.

Raghu.

-- 
N. Raghavendra <raghu@hri.res.in>, http://www.retrotexts.net/
Harish-Chandra Research Institute, http://www.hri.res.in/
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Reproducible PDF output not working

[N. Raghavendra]

At 2018-04-24T10:03:16+02:00, Arthur Reutenauer wrote:

>> PS: Incidentally, what is the "-19:00" in date in the first identifier?
>> In my time zone, IST, I would have expected 2018-04-24T01:49:47+05:30.
>
> I remember noticing something strange in the date format when files
> were compiled after midnight local time while the UTC time was before
> midnight.  It didn’t seem enough to send a bug report at the time, but
> I can look into it again.

Thank you for the help.

Raghu.

-- 
N. Raghavendra <raghu@hri.res.in>, http://www.retrotexts.net/
Harish-Chandra Research Institute, http://www.hri.res.in/
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________