debian: provide updated /etc/magic (closes: #24346)

debian/conf/magic

@@ -0,0 +1,44 @@
+# https://raw.githubusercontent.com/file/file/master/magic/Magdir/msooxml
+#------------------------------------------------------------------------------
+# $File: msooxml,v 1.8 2018/05/24 18:11:17 christos Exp $
+# msooxml:  file(1) magic for Microsoft Office XML
+# From: Ralf Brown <ralf.brown@gmail.com>
+
+# .docx, .pptx, and .xlsx are XML plus other files inside a ZIP
+#   archive.  The first member file is normally "[Content_Types].xml".
+#   but some libreoffice generated files put this later. Perhaps skip
+#   the "[Content_Types].xml" test?
+# Since MSOOXML doesn't have anything like the uncompressed "mimetype"
+#   file of ePub or OpenDocument, we'll have to scan for a filename
+#   which can distinguish between the three types
+
+0		name		msooxml
+>0		string		word/		Microsoft Word 2007+
+!:mime application/vnd.openxmlformats-officedocument.wordprocessingml.document
+>0		string		ppt/		Microsoft PowerPoint 2007+
+!:mime application/vnd.openxmlformats-officedocument.presentationml.presentation
+>0		string		xl/		Microsoft Excel 2007+
+!:mime application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
+
+# start by checking for ZIP local file header signature
+0		string		PK\003\004
+!:strength +10
+# make sure the first file is correct
+>0x1E		use		msooxml
+>0x1E		regex		\\[Content_Types\\]\\.xml|_rels/\\.rels
+# skip to the second local file header
+# since some documents include a 520-byte extra field following the file
+# header, we need to scan for the next header
+>>(18.l+49)	search/2000	PK\003\004
+# now skip to the *third* local file header; again, we need to scan due to a
+# 520-byte extra field following the file header
+>>>&26		search/1000	PK\003\004
+# and check the subdirectory name to determine which type of OOXML
+# file we have.  Correct the mimetype with the registered ones:
+# http://technet.microsoft.com/en-us/library/cc179224.aspx
+>>>>&26		use		msooxml	
+>>>>&26		default		x
+# OpenOffice/Libreoffice orders ZIP entry differently, so check the 4th file
+>>>>>&26	search/1000	PK\003\004
+>>>>>>&26	use		msooxml	
+>>>>>>&26	default		x		Microsoft OOXML

debian/install

@@ -1,2 +1,3 @@
 debian/conf/docbow.nginx            /etc/nginx/sites-available/
 debian/conf/db.template             /usr/share/docbow
+debian/conf/magic                   /usr/share/docbow

debian/links

@@ -0,0 +1 @@
+/usr/share/docbow/magic /etc/magic

debian/postrm

@@ -29,6 +29,10 @@ case "$1" in purge)
     fi
     ;;
 
+*)
+    dpkg-divert --remove --package docbow --rename /etc/magic
+    ;;
+
 esac
 
 exit 0

debian/preinst

@@ -0,0 +1,39 @@
+#!/bin/sh
+# preinst script for docbow
+#
+# see: dh_installdeb(1)
+
+set -e
+
+# summary of how this script can be called:
+#        * <new-preinst> `install'
+#        * <new-preinst> `install' <old-version>
+#        * <new-preinst> `upgrade' <old-version>
+#        * <old-preinst> `abort-upgrade' <new-version>
+# for details, see https://www.debian.org/doc/debian-policy/ or
+# the debian-policy package
+
+
+case "$1" in
+    install|upgrade)
+    dpkg-divert --add --package docbow --rename \
+                --divert /etc/magic.libmagic \
+                /etc/magic
+    ;;
+
+    abort-upgrade)
+    ;;
+
+    *)
+        echo "preinst called with unknown argument \`$1'" >&2
+        exit 1
+    ;;
+esac
+
+# dh_installdeb will replace this with shell code automatically
+# generated by other debhelper scripts.
+
+#DEBHELPER#
+
+exit 0
+