[jira] [Commented] (FOP-3040) provide deterministic PDF output

["Bernhard M. Wiedemann (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FOP-3040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17554348#comment-17554348 ] 

Bernhard M. Wiedemann commented on FOP-3040:
--------------------------------------------

E.g. when building the openSUSE pam package, it regenerates its docs with

/usr/bin/fop Linux-PAM_ADG.fo Linux-PAM_ADG.pdf

release-notes-openSUSE is another affected package.

 

At least currently I do not see the BaseFont variation anymore, but still variations in CreationDate MetadataDate CreateDate and ID

> provide deterministic PDF output
> --------------------------------
>
>                 Key: FOP-3040
>                 URL: https://issues.apache.org/jira/browse/FOP-3040
>             Project: FOP
>          Issue Type: Bug
>            Reporter: Bernhard M. Wiedemann
>            Priority: Major
>
> When you use the same input to create PDF output twice, results will vary from IDs, Time and something else.
> [https://github.com/apache/xmlgraphics-fop/pull/65] fixes the time portion, but more fixes are needed for fully deterministic bit-identical output.
> Especially the diff
> {{-/BaseFont /EAAAAC+DejaVuSansMono}}
> {{+/BaseFont /EAAAAC+DejaVuSansMono-Bold}}
> looks like a bug worth debugging outside of the context of reproducible builds.
> See [https://reproducible-builds.org/] for why this matters.



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