GNU bug report logs - #34891
25.2; ORG-PUBLISH-FIND-DATE should not use Creation/Publish date (#+DATE:) in file as a modification timestamp.

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: David Trudgett <david.trudgett <at> eclecticse.com.au>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.2; ORG-PUBLISH-FIND-DATE should not use Creation/Publish date
 (#+DATE:) in file as a modification timestamp.
Date: Sun, 17 Mar 2019 16:58:16 +1100

Reproduce:

In an Org mode file, add a #+DATE tag as follows:

#+DATE: First published: 1 February 2014

Then initiate a project publish, which publishes (by default) only
changed files. A date such as the above will not be parsed, so
ox-publish.el will always publish it, even though it has not changed.
Using instead a parsable date format (such as 2014-02-01), this date will be
recognised, and will result in the file never being published, because
it is treating the date as a modification date instead of a creation date.

Desired Behaviour:

ox-publish.el, in function ORG-PUBLISH-FIND-DATE should not be using
this date to detect modifications, as it will never change, and no
modifications will be detected for publishing.

Suggested Fix:

My suggested fix is to always use filesystem timestamp and never use the
#+DATE: line within the Org file.

I.e., change the following lines:

         (cond ((let ((ts (and (consp date) (assq 'timestamp date))))
              (and ts
               (let ((value (org-element-interpret-data ts)))
                 (and (org-string-nw-p value)
                  (org-time-string-to-time value))))))
           ((file-exists-p file)
            (file-attribute-modification-time (file-attributes file)))
           (t (error "No such file: \"%s\"" file)))))))))

to:

         (cond ((file-exists-p file)
            (file-attribute-modification-time (file-attributes file)))
           (t (error "No such file: \"%s\"" file)))))))))

System Info:

In GNU Emacs 25.2.2 (x86_64-pc-linux-gnu, GTK+ Version 3.22.21)
 of 2017-09-23, modified by Debian built on lgw01-amd64-050
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description:    Ubuntu 18.04.2 LTS

Configured using:
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Configured features:
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ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
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Important settings:
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ada-fix-error ada-lalr-elisp wisi-elisp-parse wisi-compile wisi
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cal-loaddefs finder-inf tex-site slime-autoloads info package epg-config
seq byte-opt gv bytecomp byte-compile cl-extra help-mode easymenu cconv
cl-loaddefs pcase cl-lib mule-util tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel x-win term/common-win x-dnd
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elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
frame cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan
thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian
slovak czech european ethiopic indian cyrillic chinese charscript
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote dbusbind inotify
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 1480273 148352)
 (symbols 48 72742 0)
 (miscs 40 4010 2130)
 (strings 32 260753 32476)
 (string-bytes 1 8504838)
 (vectors 16 116390)
 (vector-slots 8 2382398 118984)
 (floats 8 1310 1047)
 (intervals 56 78460 5861)
 (buffers 976 158))

-- 

David K. Trudgett
IT Systems and Software Engineer
Ph: 0467 312 782 (mobile) [intl: +61 467 312 782]
Email: David.Trudgett <at> eclecticse.com.au
Web: http://www.eclecticse.com.au/ (blog)
LinkedIn: https://au.linkedin.com/in/david-trudgett-6191ba103
ABN: 87 984 125 899

Message #12 received at 34891 <at> debbugs.gnu.org (full text, mbox):

From: Nicolas Goaziou <mail <at> nicolasgoaziou.fr>
To: David Trudgett <david.trudgett <at> eclecticse.com.au>
Cc: 34891 <at> debbugs.gnu.org
Subject: Re: bug#34891: 25.2;
 ORG-PUBLISH-FIND-DATE should not use Creation/Publish date (#+DATE:)
 in file as a modification timestamp.
Date: Sun, 05 May 2019 11:29:46 +0200

Hello,

David Trudgett <david.trudgett <at> eclecticse.com.au> writes:

> Reproduce:
>
> In an Org mode file, add a #+DATE tag as follows:
>
> #+DATE: First published: 1 February 2014
>
> Then initiate a project publish, which publishes (by default) only
> changed files. A date such as the above will not be parsed, so
> ox-publish.el will always publish it, even though it has not changed.
> Using instead a parsable date format (such as 2014-02-01), this date will be
> recognised, and will result in the file never being published, because
> it is treating the date as a modification date instead of a creation date.
>
> Desired Behaviour:
>
> ox-publish.el, in function ORG-PUBLISH-FIND-DATE should not be using
> this date to detect modifications, as it will never change, and no
> modifications will be detected for publishing.

I don't understand how you come to this conclusion. 

The function responsible for deciding if a file should be published is
`org-publish-cache-file-needs-publishing'. It doesn't call
`org-publish-find-date', but `org-publish-cache-ctime-of-src'. The
latter only uses `file-attribute-modification-time'.

IOW, I think the file is published because you modified since last
publishing.

WDYT?

Regards,

-- 
Nicolas Goaziou

Message #17 received at 34891-done <at> debbugs.gnu.org (full text, mbox):

From: Bastien <bzg <at> gnu.org>
To: Nicolas Goaziou <mail <at> nicolasgoaziou.fr>
Cc: David Trudgett <david.trudgett <at> eclecticse.com.au>,
 34891-done <at> debbugs.gnu.org
Subject: Re: bug#34891: 25.2; ORG-PUBLISH-FIND-DATE should not use
 Creation/Publish date (#+DATE:) in file as a modification timestamp.
Date: Sun, 24 May 2020 10:22:03 +0200

Hi David,

after Nicolas' answer, I don't see the bug in here, so I am closing
this bug report.

If you think there is still something wrong, please test with latest
Org and report it again on emacs-orgmode <at> gnu.org.

Thanks,

-- 
 Bastien

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