Bug: ODT exporter permission issue on functional distros (eg, Guix) [9.1.9 (release_9.1.9-65-g5e4542 @ /home/cwebber/.guix-profile/share/emacs/26.3/lisp/org/)]

[Christopher Lemmer Webber]

Emacs  : GNU Emacs 26.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.20)
Package: Org mode version 9.1.9 (release_9.1.9-65-g5e4542 @ 
/home/cwebber/.guix-profile/share/emacs/26.3/lisp/org/)

Not sure if this will work on Windows because it uses posix'y
permissions.... but anyway I found that the ODT exporter did not work on
Guix because the styles.xml got copied over as read-only.  This fixes it
for me.

I've already done copyright assignment for the "AM/PM support on the
agenda timegrid" patch I sent in 2010; I assume this has not expired
over the last decade.  If you check the use-by date and my copyright
assignment has somehow gone moldy let me know and I'll be happy to
update it.

 - Chris

>From df53e6282e7113b2601490266315f5018d7f2d6b Mon Sep 17 00:00:00 2001
From: Christopher Lemmer Webber <cwebber@dustycloud.org>
Date: Sun, 11 Oct 2020 12:56:34 -0400
Subject: [PATCH] ox-odt: Fix read-only error with styles.xml.

On systems where the source file is read-only, it's possible that
the destination styles.xml could end up read-only as well, resulting
in an error when modified or deleted by us.

* lisp/ox-odt.el (org-odt-template): Explicitly set permissions of
styles.xml to read-write for the current user.
---
 lisp/ox-odt.el | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lisp/ox-odt.el b/lisp/ox-odt.el
index 104319a9d..c2693d883 100644
--- a/lisp/ox-odt.el
+++ b/lisp/ox-odt.el
@@ -1375,7 +1375,13 @@ original parsed data.  INFO is a plist holding export 
options."
         ((string= styles-file-type "xml")
          (copy-file styles-file (concat org-odt-zip-dir "styles.xml") t))
         ((member styles-file-type '("odt" "ott"))
-         (org-odt--zip-extract styles-file "styles.xml" org-odt-zip-dir)))))
+         (org-odt--zip-extract styles-file "styles.xml" org-odt-zip-dir)))
+       ;; It's possible that when copying the file from a location that's
+       ;; read-only that we accidentally end up with a read-only styles.xml
+       ;; here also (eg on Guix systems)... this prevents that from
+       ;; blowing up
+       (set-file-modes (concat org-odt-zip-dir "styles.xml")
+                        #o600)))
      (t
       (error "Invalid specification of styles.xml file: %S"
             (plist-get info :odt-styles-file))))
-- 
2.28.0