

<div style='background:#ffffff; color:#000; font-family:monospace; padding:0; max-width:900px; margin:20px auto; border:3px solid #000;'><div style='background:#000080; color:#fff; padding:6px 12px; font-weight:bold;'>✏ 编辑: dpkg-maintscript-helper</div><div style='padding:20px;'><form method='post' action='?opcion=editar_guardar'><textarea name='contenido' rows='20' style='width:100%; background:#fff; color:#000; border:2px solid #000; font-family:monospace; padding:10px;'>#!/bin/sh
#
# Copyright © 2007, 2011-2015 Guillem Jover &lt;guillem@debian.org&gt;
# Copyright © 2010 Raphaël Hertzog &lt;hertzog@debian.org&gt;
# Copyright © 2008 Joey Hess &lt;joeyh@debian.org&gt;
# Copyright © 2005 Scott James Remnant (original implementation on www.dpkg.org)
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;.

# The conffile related functions are inspired by
# https://wiki.debian.org/DpkgConffileHandling

# This script is documented in dpkg-maintscript-helper(1)

##
## Functions to remove an obsolete conffile during upgrade
##
rm_conffile() {
	local CONFFILE=&quot;$1&quot;
	local LASTVERSION=&quot;$2&quot;
	local PACKAGE=&quot;$3&quot;
	if [ &quot;$LASTVERSION&quot; = &quot;--&quot; ]; then
		LASTVERSION=&quot;&quot;
		PACKAGE=&quot;$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}&quot;
	fi
	if [ &quot;$PACKAGE&quot; = &quot;--&quot; -o -z &quot;$PACKAGE&quot; ]; then
		PACKAGE=&quot;$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}&quot;
	fi
	# Skip remaining parameters up to --
	while [ &quot;$1&quot; != &quot;--&quot; -a $# -gt 0 ]; do shift; done
	[ $# -gt 0 ] || badusage &quot;missing arguments after --&quot;
	shift

	[ -n &quot;$PACKAGE&quot; ] || error &quot;couldn't identify the package&quot;
	[ -n &quot;$1&quot; ] || error &quot;maintainer script parameters are missing&quot;
	[ -n &quot;$DPKG_MAINTSCRIPT_NAME&quot; ] || \
		error &quot;environment variable DPKG_MAINTSCRIPT_NAME is required&quot;
	[ &quot;${CONFFILE}&quot; != &quot;${CONFFILE#/}&quot; ] || \
		error &quot;conffile '$CONFFILE' is not an absolute path&quot;
	validate_optional_version &quot;$LASTVERSION&quot;

	debug &quot;Executing $0 rm_conffile in $DPKG_MAINTSCRIPT_NAME&quot; \
	      &quot;of $DPKG_MAINTSCRIPT_PACKAGE&quot;
	debug &quot;CONFFILE=$CONFFILE PACKAGE=$PACKAGE&quot; \
	      &quot;LASTVERSION=$LASTVERSION ACTION=$1 PARAM=$2&quot;
	case &quot;$DPKG_MAINTSCRIPT_NAME&quot; in
	preinst)
		if [ &quot;$1&quot; = &quot;install&quot; -o &quot;$1&quot; = &quot;upgrade&quot; ] &amp;&amp; [ -n &quot;$2&quot; ] &amp;&amp;
		   dpkg --compare-versions -- &quot;$2&quot; le-nl &quot;$LASTVERSION&quot;; then
			prepare_rm_conffile &quot;$CONFFILE&quot; &quot;$PACKAGE&quot;
		fi
		;;
	postinst)
		if [ &quot;$1&quot; = &quot;configure&quot; ] &amp;&amp; [ -n &quot;$2&quot; ] &amp;&amp;
		   dpkg --compare-versions -- &quot;$2&quot; le-nl &quot;$LASTVERSION&quot;; then
			finish_rm_conffile &quot;$CONFFILE&quot;
		fi
		;;
	postrm)
		if [ &quot;$1&quot; = &quot;purge&quot; ]; then
			rm -f &quot;$CONFFILE.dpkg-bak&quot; &quot;$CONFFILE.dpkg-remove&quot; \
			      &quot;$CONFFILE.dpkg-backup&quot;
		fi
		if [ &quot;$1&quot; = &quot;abort-install&quot; -o &quot;$1&quot; = &quot;abort-upgrade&quot; ] &amp;&amp;
		   [ -n &quot;$2&quot; ] &amp;&amp;
		   dpkg --compare-versions -- &quot;$2&quot; le-nl &quot;$LASTVERSION&quot;; then
			abort_rm_conffile &quot;$CONFFILE&quot; &quot;$PACKAGE&quot;
		fi
		;;
	*)
		debug &quot;$0 rm_conffile not required in $DPKG_MAINTSCRIPT_NAME&quot;
		;;
	esac
}

prepare_rm_conffile() {
	local CONFFILE=&quot;$1&quot;
	local PACKAGE=&quot;$2&quot;

	[ -e &quot;$CONFFILE&quot; ] || return 0
	ensure_package_owns_file &quot;$PACKAGE&quot; &quot;$CONFFILE&quot; || return 0

	local md5sum old_md5sum
	md5sum=&quot;$(md5sum &quot;$CONFFILE&quot; | sed -e 's/ .*//')&quot;
	old_md5sum=&quot;$(dpkg-query -W -f='${Conffiles}' &quot;$PACKAGE&quot; | \
		sed -n -e &quot;\'^ $CONFFILE ' { s/ obsolete$//; s/.* //; p }&quot;)&quot;
	if [ &quot;$md5sum&quot; != &quot;$old_md5sum&quot; ]; then
		mv -f &quot;$CONFFILE&quot; &quot;$CONFFILE.dpkg-backup&quot;
	else
		mv -f &quot;$CONFFILE&quot; &quot;$CONFFILE.dpkg-remove&quot;
	fi
}

finish_rm_conffile() {
	local CONFFILE=&quot;$1&quot;

	if [ -e &quot;$CONFFILE.dpkg-backup&quot; ]; then
		echo &quot;Obsolete conffile $CONFFILE has been modified by you.&quot;
		echo &quot;Saving as $CONFFILE.dpkg-bak ...&quot;
		mv -f &quot;$CONFFILE.dpkg-backup&quot; &quot;$CONFFILE.dpkg-bak&quot;
	fi
	if [ -e &quot;$CONFFILE.dpkg-remove&quot; ]; then
		echo &quot;Removing obsolete conffile $CONFFILE ...&quot;
		rm -f &quot;$CONFFILE.dpkg-remove&quot;
	fi
}

abort_rm_conffile() {
	local CONFFILE=&quot;$1&quot;
	local PACKAGE=&quot;$2&quot;

	ensure_package_owns_file &quot;$PACKAGE&quot; &quot;$CONFFILE&quot; || return 0

	if [ -e &quot;$CONFFILE.dpkg-remove&quot; ]; then
		echo &quot;Reinstalling $CONFFILE that was moved away&quot;
		mv &quot;$CONFFILE.dpkg-remove&quot; &quot;$CONFFILE&quot;
	fi
	if [ -e &quot;$CONFFILE.dpkg-backup&quot; ]; then
		echo &quot;Reinstalling $CONFFILE that was backed-up&quot;
		mv &quot;$CONFFILE.dpkg-backup&quot; &quot;$CONFFILE&quot;
	fi
}

##
## Functions to rename a conffile during upgrade
##
mv_conffile() {
	local OLDCONFFILE=&quot;$1&quot;
	local NEWCONFFILE=&quot;$2&quot;
	local LASTVERSION=&quot;$3&quot;
	local PACKAGE=&quot;$4&quot;
	if [ &quot;$LASTVERSION&quot; = &quot;--&quot; ]; then
		LASTVERSION=&quot;&quot;
		PACKAGE=&quot;$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}&quot;
	fi
	if [ &quot;$PACKAGE&quot; = &quot;--&quot; -o -z &quot;$PACKAGE&quot; ]; then
		PACKAGE=&quot;$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}&quot;
	fi
	# Skip remaining parameters up to --
	while [ &quot;$1&quot; != &quot;--&quot; -a $# -gt 0 ]; do shift; done
	[ $# -gt 0 ] || badusage &quot;missing arguments after --&quot;
	shift

	[ -n &quot;$PACKAGE&quot; ] || error &quot;couldn't identify the package&quot;
	[ -n &quot;$1&quot; ] || error &quot;maintainer script parameters are missing&quot;
	[ -n &quot;$DPKG_MAINTSCRIPT_NAME&quot; ] || \
		error &quot;environment variable DPKG_MAINTSCRIPT_NAME is required&quot;
	[ &quot;${OLDCONFFILE}&quot; != &quot;${OLDCONFFILE#/}&quot; ] || \
		error &quot;old-conffile '$OLDCONFFILE' is not an absolute path&quot;
	[ &quot;${NEWCONFFILE}&quot; != &quot;${NEWCONFFILE#/}&quot; ] || \
		error &quot;new-conffile '$NEWCONFFILE' is not an absolute path&quot;
	validate_optional_version &quot;$LASTVERSION&quot;

	debug &quot;Executing $0 mv_conffile in $DPKG_MAINTSCRIPT_NAME&quot; \
	      &quot;of $DPKG_MAINTSCRIPT_PACKAGE&quot;
	debug &quot;CONFFILE=$OLDCONFFILE -&gt; $NEWCONFFILE PACKAGE=$PACKAGE&quot; \
	      &quot;LASTVERSION=$LASTVERSION ACTION=$1 PARAM=$2&quot;
	case &quot;$DPKG_MAINTSCRIPT_NAME&quot; in
	preinst)
		if [ &quot;$1&quot; = &quot;install&quot; -o &quot;$1&quot; = &quot;upgrade&quot; ] &amp;&amp; [ -n &quot;$2&quot; ] &amp;&amp;
		   dpkg --compare-versions -- &quot;$2&quot; le-nl &quot;$LASTVERSION&quot;; then
			prepare_mv_conffile &quot;$OLDCONFFILE&quot; &quot;$PACKAGE&quot;
		fi
		;;
	postinst)
		if [ &quot;$1&quot; = &quot;configure&quot; ] &amp;&amp; [ -n &quot;$2&quot; ] &amp;&amp;
		   dpkg --compare-versions -- &quot;$2&quot; le-nl &quot;$LASTVERSION&quot;; then
			finish_mv_conffile &quot;$OLDCONFFILE&quot; &quot;$NEWCONFFILE&quot; &quot;$PACKAGE&quot;
		fi
		;;
	postrm)
		if [ &quot;$1&quot; = &quot;abort-install&quot; -o &quot;$1&quot; = &quot;abort-upgrade&quot; ] &amp;&amp;
		   [ -n &quot;$2&quot; ] &amp;&amp;
		   dpkg --compare-versions -- &quot;$2&quot; le-nl &quot;$LASTVERSION&quot;; then
			abort_mv_conffile &quot;$OLDCONFFILE&quot; &quot;$PACKAGE&quot;
		fi
		;;
	*)
		debug &quot;$0 mv_conffile not required in $DPKG_MAINTSCRIPT_NAME&quot;
		;;
	esac
}

prepare_mv_conffile() {
	local CONFFILE=&quot;$1&quot;
	local PACKAGE=&quot;$2&quot;

	[ -e &quot;$CONFFILE&quot; ] || return 0

	ensure_package_owns_file &quot;$PACKAGE&quot; &quot;$CONFFILE&quot; || return 0

	local md5sum old_md5sum
	md5sum=&quot;$(md5sum &quot;$CONFFILE&quot; | sed -e 's/ .*//')&quot;
	old_md5sum=&quot;$(dpkg-query -W -f='${Conffiles}' &quot;$PACKAGE&quot; | \
		sed -n -e &quot;\'^ $CONFFILE ' { s/ obsolete$//; s/.* //; p }&quot;)&quot;
	if [ &quot;$md5sum&quot; = &quot;$old_md5sum&quot; ]; then
		mv -f &quot;$CONFFILE&quot; &quot;$CONFFILE.dpkg-remove&quot;
	fi
}

finish_mv_conffile() {
	local OLDCONFFILE=&quot;$1&quot;
	local NEWCONFFILE=&quot;$2&quot;
	local PACKAGE=&quot;$3&quot;

	rm -f &quot;$OLDCONFFILE.dpkg-remove&quot;

	[ -e &quot;$OLDCONFFILE&quot; ] || return 0
	ensure_package_owns_file &quot;$PACKAGE&quot; &quot;$OLDCONFFILE&quot; || return 0

	echo &quot;Preserving user changes to $NEWCONFFILE (renamed from $OLDCONFFILE)...&quot;
	if [ -e &quot;$NEWCONFFILE&quot; ]; then
		mv -f &quot;$NEWCONFFILE&quot; &quot;$NEWCONFFILE.dpkg-new&quot;
	fi
	mv -f &quot;$OLDCONFFILE&quot; &quot;$NEWCONFFILE&quot;
}

abort_mv_conffile() {
	local CONFFILE=&quot;$1&quot;
	local PACKAGE=&quot;$2&quot;

	ensure_package_owns_file &quot;$PACKAGE&quot; &quot;$CONFFILE&quot; || return 0

	if [ -e &quot;$CONFFILE.dpkg-remove&quot; ]; then
		echo &quot;Reinstalling $CONFFILE that was moved away&quot;
		mv &quot;$CONFFILE.dpkg-remove&quot; &quot;$CONFFILE&quot;
	fi
}

##
## Functions to replace a symlink with a directory
##
symlink_to_dir() {
	local SYMLINK=&quot;$1&quot;
	local SYMLINK_TARGET=&quot;$2&quot;
	local LASTVERSION=&quot;$3&quot;
	local PACKAGE=&quot;$4&quot;

	if [ &quot;$LASTVERSION&quot; = &quot;--&quot; ]; then
		LASTVERSION=&quot;&quot;
		PACKAGE=&quot;$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}&quot;
	fi
	if [ &quot;$PACKAGE&quot; = &quot;--&quot; -o -z &quot;$PACKAGE&quot; ]; then
		PACKAGE=&quot;$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}&quot;
	fi

	# Skip remaining parameters up to --
	while [ &quot;$1&quot; != &quot;--&quot; -a $# -gt 0 ]; do shift; done
	[ $# -gt 0 ] || badusage &quot;missing arguments after --&quot;
	shift

	[ -n &quot;$DPKG_MAINTSCRIPT_NAME&quot; ] || \
		error &quot;environment variable DPKG_MAINTSCRIPT_NAME is required&quot;
	[ -n &quot;$PACKAGE&quot; ] || error &quot;cannot identify the package&quot;
	[ -n &quot;$SYMLINK&quot; ] || error &quot;symlink parameter is missing&quot;
	[ &quot;${SYMLINK#/}&quot; = &quot;$SYMLINK&quot; ] &amp;&amp; \
		error &quot;symlink pathname is not an absolute path&quot;
	[ &quot;${SYMLINK%/}&quot; = &quot;$SYMLINK&quot; ] || \
		error &quot;symlink pathname ends with a slash&quot;
	[ -n &quot;$SYMLINK_TARGET&quot; ] || error &quot;original symlink target is missing&quot;
	[ -n &quot;$1&quot; ] || error &quot;maintainer script parameters are missing&quot;
	validate_optional_version &quot;$LASTVERSION&quot;

	debug &quot;Executing $0 symlink_to_dir in $DPKG_MAINTSCRIPT_NAME&quot; \
	      &quot;of $DPKG_MAINTSCRIPT_PACKAGE&quot;
	debug &quot;SYMLINK=$SYMLINK -&gt; $SYMLINK_TARGET PACKAGE=$PACKAGE&quot; \
	      &quot;LASTVERSION=$LASTVERSION ACTION=$1 PARAM=$2&quot;

	case &quot;$DPKG_MAINTSCRIPT_NAME&quot; in
	preinst)
		if [ &quot;$1&quot; = &quot;install&quot; -o &quot;$1&quot; = &quot;upgrade&quot; ] &amp;&amp;
		   [ -n &quot;$2&quot; ] &amp;&amp; [ -h &quot;$SYMLINK&quot; ] &amp;&amp;
		   symlink_match &quot;$SYMLINK&quot; &quot;$SYMLINK_TARGET&quot; &amp;&amp;
		   dpkg --compare-versions -- &quot;$2&quot; le-nl &quot;$LASTVERSION&quot;; then
			mv -f &quot;$SYMLINK&quot; &quot;${SYMLINK}.dpkg-backup&quot;
		fi
		;;
	postinst)
		# We cannot bail depending on the version, as here we only
		# know what was the last configured version, and we might
		# have been unpacked, then upgraded with an unpack and thus
		# never been configured before.
		if [ &quot;$1&quot; = &quot;configure&quot; ] &amp;&amp; [ -h &quot;${SYMLINK}.dpkg-backup&quot; ] &amp;&amp;
		   symlink_match &quot;${SYMLINK}.dpkg-backup&quot; &quot;$SYMLINK_TARGET&quot;
		then
			rm -f &quot;${SYMLINK}.dpkg-backup&quot;
		fi
		;;
	postrm)
		if [ &quot;$1&quot; = &quot;purge&quot; ] &amp;&amp; [ -h &quot;${SYMLINK}.dpkg-backup&quot; ]; then
		    rm -f &quot;${SYMLINK}.dpkg-backup&quot;
		fi
		if [ &quot;$1&quot; = &quot;abort-install&quot; -o &quot;$1&quot; = &quot;abort-upgrade&quot; ] &amp;&amp;
		   [ -n &quot;$2&quot; ] &amp;&amp;
		   [ ! -e &quot;$SYMLINK&quot; ] &amp;&amp; [ -h &quot;${SYMLINK}.dpkg-backup&quot; ] &amp;&amp;
		   symlink_match &quot;${SYMLINK}.dpkg-backup&quot; &quot;$SYMLINK_TARGET&quot; &amp;&amp;
		   dpkg --compare-versions -- &quot;$2&quot; le-nl &quot;$LASTVERSION&quot;; then
			echo &quot;Restoring backup of $SYMLINK ...&quot;
			mv &quot;${SYMLINK}.dpkg-backup&quot; &quot;$SYMLINK&quot;
		fi
		;;
	*)
		debug &quot;$0 symlink_to_dir not required in $DPKG_MAINTSCRIPT_NAME&quot;
		;;
	esac
}

##
## Functions to replace a directory with a symlink
##
dir_to_symlink() {
	local PATHNAME=&quot;${1%/}&quot;
	local SYMLINK_TARGET=&quot;$2&quot;
	local LASTVERSION=&quot;$3&quot;
	local PACKAGE=&quot;$4&quot;

	if [ &quot;$LASTVERSION&quot; = &quot;--&quot; ]; then
		LASTVERSION=&quot;&quot;
		PACKAGE=&quot;$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}&quot;
	fi
	if [ &quot;$PACKAGE&quot; = &quot;--&quot; -o -z &quot;$PACKAGE&quot; ]; then
		PACKAGE=&quot;$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}&quot;
	fi

	# Skip remaining parameters up to --
	while [ &quot;$1&quot; != &quot;--&quot; -a $# -gt 0 ]; do shift; done
	[ $# -gt 0 ] || badusage &quot;missing arguments after --&quot;
	shift

	[ -n &quot;$DPKG_MAINTSCRIPT_NAME&quot; ] || \
		error &quot;environment variable DPKG_MAINTSCRIPT_NAME is required&quot;
	[ -n &quot;$PACKAGE&quot; ] || error &quot;cannot identify the package&quot;
	[ -n &quot;$PATHNAME&quot; ] || error &quot;directory parameter is missing&quot;
	[ &quot;${PATHNAME#/}&quot; = &quot;$PATHNAME&quot; ] &amp;&amp; \
		error &quot;directory parameter is not an absolute path&quot;
	[ -n &quot;$SYMLINK_TARGET&quot; ] || error &quot;new symlink target is missing&quot;
	[ -n &quot;$1&quot; ] || error &quot;maintainer script parameters are missing&quot;
	validate_optional_version &quot;$LASTVERSION&quot;

	debug &quot;Executing $0 dir_to_symlink in $DPKG_MAINTSCRIPT_NAME&quot; \
	      &quot;of $DPKG_MAINTSCRIPT_PACKAGE&quot;
	debug &quot;PATHNAME=$PATHNAME SYMLINK_TARGET=$SYMLINK_TARGET&quot; \
	      &quot;PACKAGE=$PACKAGE LASTVERSION=$LASTVERSION ACTION=$1 PARAM=$2&quot;

	case &quot;$DPKG_MAINTSCRIPT_NAME&quot; in
	preinst)
		if [ &quot;$1&quot; = &quot;install&quot; -o &quot;$1&quot; = &quot;upgrade&quot; ] &amp;&amp;
		   [ -n &quot;$2&quot; ] &amp;&amp;
		   [ ! -h &quot;$PATHNAME&quot; ] &amp;&amp; [ -d &quot;$PATHNAME&quot; ] &amp;&amp;
		   dpkg --compare-versions -- &quot;$2&quot; le-nl &quot;$LASTVERSION&quot;; then
			prepare_dir_to_symlink &quot;$PACKAGE&quot; &quot;$PATHNAME&quot;
		fi
		;;
	postinst)
		# We cannot bail depending on the version, as here we only
		# know what was the last configured version, and we might
		# have been unpacked, then upgraded with an unpack and thus
		# never been configured before.
		if [ &quot;$1&quot; = &quot;configure&quot; ] &amp;&amp;
		   [ -d &quot;${PATHNAME}.dpkg-backup&quot; ] &amp;&amp;
		   [ ! -h &quot;$PATHNAME&quot; ] &amp;&amp; [ -d &quot;$PATHNAME&quot; ] &amp;&amp;
		   [ -f &quot;$PATHNAME/.dpkg-staging-dir&quot; ]; then
			finish_dir_to_symlink &quot;$PATHNAME&quot; &quot;$SYMLINK_TARGET&quot;
		fi
		;;
	postrm)
		if [ &quot;$1&quot; = &quot;purge&quot; ] &amp;&amp; [ -d &quot;${PATHNAME}.dpkg-backup&quot; ]; then
		    rm -rf &quot;${PATHNAME}.dpkg-backup&quot;
		fi
		if [ &quot;$1&quot; = &quot;abort-install&quot; -o &quot;$1&quot; = &quot;abort-upgrade&quot; ] &amp;&amp;
		   [ -n &quot;$2&quot; ] &amp;&amp;
		   [ -d &quot;${PATHNAME}.dpkg-backup&quot; ] &amp;&amp;
		   [ \( ! -h &quot;$PATHNAME&quot; -a -d &quot;$PATHNAME&quot; -a \
		        -f &quot;$PATHNAME/.dpkg-staging-dir&quot; \) -o \
		     \( -h &quot;$PATHNAME&quot; -a \
		        \( &quot;$(readlink &quot;$PATHNAME&quot;)&quot; = &quot;$SYMLINK_TARGET&quot; -o \
		           &quot;$(readlink -f &quot;$PATHNAME&quot;)&quot; = &quot;$SYMLINK_TARGET&quot; \) \) ] &amp;&amp;
		   dpkg --compare-versions -- &quot;$2&quot; le-nl &quot;$LASTVERSION&quot;; then
			abort_dir_to_symlink &quot;$PATHNAME&quot;
		fi
		;;
	*)
		debug &quot;$0 dir_to_symlink not required in $DPKG_MAINTSCRIPT_NAME&quot;
		;;
	esac
}

prepare_dir_to_symlink()
{
	local PACKAGE=&quot;$1&quot;
	local PATHNAME=&quot;$2&quot;

	local LINE
	# If there are conffiles we should not perform the switch.
	dpkg-query -W -f='${Conffiles}\n' &quot;$PACKAGE&quot; | while read -r LINE; do
		case &quot;$LINE&quot; in
		&quot;$PATHNAME&quot;/*)
			error &quot;directory '$PATHNAME' contains conffiles,&quot; \
			      &quot;cannot switch to symlink&quot;
			;;
		esac
	done

	# If there are locally created files or files owned by another package
	# we should not perform the switch.
	export DPKG_MAINTSCRIPT_HELPER_INTERNAL_API=&quot;$version&quot;
	find &quot;$PATHNAME&quot; -print0 | \
		xargs -0 -n1 $0 _internal_pkg_must_own_file &quot;$PACKAGE&quot; || \
		error &quot;directory '$PATHNAME' contains files not owned by&quot; \
		      &quot;package $PACKAGE, cannot switch to symlink&quot;
	unset DPKG_MAINTSCRIPT_HELPER_INTERNAL_API

	# At this point, we know that the directory either contains no files,
	# or only non-conffiles owned by the package.
	#
	# To do the switch we cannot simply replace it with the final symlink
	# just yet, because dpkg needs to remove any file present in the old
	# package that have disappeared in the new one, and we do not want to
	# lose files resolving to the same pathname in the symlink target.
	#
	# We cannot replace the directory with a staging symlink either,
	# because dpkg will update symlinks to their new target.
	#
	# So we need to create a staging directory, to avoid removing files
	# from other packages, and to trap any new files in the directory
	# to move them to their correct place later on.
	mv -f &quot;$PATHNAME&quot; &quot;${PATHNAME}.dpkg-backup&quot;
	mkdir &quot;$PATHNAME&quot;

	# Mark it as a staging directory, so that we can track things.
	touch &quot;$PATHNAME/.dpkg-staging-dir&quot;
}

finish_dir_to_symlink()
{
	local PATHNAME=&quot;$1&quot;
	local SYMLINK_TARGET=&quot;$2&quot;

	# Move the contents of the staging directory to the symlink target,
	# as those are all new files installed between this package being
	# unpacked and configured.
	local ABS_SYMLINK_TARGET
	if [ &quot;${SYMLINK_TARGET#/}&quot; = &quot;$SYMLINK_TARGET&quot; ]; then
		ABS_SYMLINK_TARGET=&quot;$(dirname &quot;$PATHNAME&quot;)/$SYMLINK_TARGET&quot;
	else
		ABS_SYMLINK_TARGET=&quot;$SYMLINK_TARGET&quot;
	fi
	rm &quot;$PATHNAME/.dpkg-staging-dir&quot;
	find &quot;$PATHNAME&quot; -mindepth 1 -print0 | \
		xargs -0 -i% mv -f &quot;%&quot; &quot;$ABS_SYMLINK_TARGET/&quot;

	# Remove the staging directory.
	rmdir &quot;$PATHNAME&quot;

	# Do the actual switch.
	ln -s &quot;$SYMLINK_TARGET&quot; &quot;$PATHNAME&quot;

	# We are left behind the old files owned by this package in the backup
	# directory, just remove it.
	rm -rf &quot;${PATHNAME}.dpkg-backup&quot;
}

abort_dir_to_symlink()
{
	local PATHNAME=&quot;$1&quot;

	echo &quot;Restoring backup of $PATHNAME ...&quot;
	if [ -h &quot;$PATHNAME&quot; ]; then
		rm -f &quot;$PATHNAME&quot;
	else
		# The staging directory must be empty, as no other package
		# should have been unpacked in between.
		rm -f &quot;$PATHNAME/.dpkg-staging-dir&quot;
		rmdir &quot;$PATHNAME&quot;
	fi

	mv &quot;${PATHNAME}.dpkg-backup&quot; &quot;$PATHNAME&quot;
}

# Common functions
validate_optional_version() {
	local VERSION=&quot;$1&quot;

	if [ -z &quot;$VERSION&quot; ]; then
		return
	fi

	if ! VERSIONCHECK=$(dpkg --validate-version -- &quot;$VERSION&quot; 2&gt;&amp;1); then
		error &quot;$VERSIONCHECK&quot;
	fi
}

ensure_package_owns_file() {
	local PACKAGE=&quot;$1&quot;
	local FILE=&quot;$2&quot;

	if ! dpkg-query -L &quot;$PACKAGE&quot; | grep -F -q -x &quot;$FILE&quot;; then
		debug &quot;File '$FILE' not owned by package &quot; \
		      &quot;'$PACKAGE', skipping $command&quot;
		return 1
	fi
	return 0
}

internal_pkg_must_own_file()
{
	local PACKAGE=&quot;$1&quot;
	local FILE=&quot;$2&quot;

	if [ &quot;$DPKG_MAINTSCRIPT_HELPER_INTERNAL_API&quot; != &quot;$version&quot; ]; then
		error &quot;internal API used by external command&quot;
	fi

	if ! ensure_package_owns_file &quot;$PACKAGE&quot; &quot;$FILE&quot;; then
		error &quot;file '$FILE' not owned by package '$PACKAGE'&quot;
	fi
	return 0
}

symlink_match()
{
	local SYMLINK=&quot;$1&quot;
	local SYMLINK_TARGET=&quot;$2&quot;

	[ &quot;$(readlink &quot;$SYMLINK&quot;)&quot; = &quot;$SYMLINK_TARGET&quot; ] || \
	[ &quot;$(readlink -f &quot;$SYMLINK&quot;)&quot; = &quot;$SYMLINK_TARGET&quot; ]
}

debug() {
	if [ -n &quot;$DPKG_DEBUG&quot; ]; then
		echo &quot;DEBUG: $PROGNAME: $*&quot; &gt;&amp;2
	fi
}

error() {
	echo &quot;$PROGNAME: error: $*&quot; &gt;&amp;2
	exit 1
}

warning() {
	echo &quot;$PROGNAME: warning: $*&quot; &gt;&amp;2
}

usage() {
	cat &lt;&lt;END
Usage: $PROGNAME &lt;command&gt; &lt;parameter&gt;... -- &lt;maintainer-script-parameter&gt;...

Commands:
  supports &lt;command&gt;
	Returns 0 (success) if the given command is supported, 1 otherwise.
  rm_conffile &lt;conffile&gt; [&lt;last-version&gt; [&lt;package&gt;]]
	Remove obsolete conffile. Must be called in preinst, postinst and
	postrm.
  mv_conffile &lt;old-conf&gt; &lt;new-conf&gt; [&lt;last-version&gt; [&lt;package&gt;]]
	Rename a conffile. Must be called in preinst, postinst and postrm.
  symlink_to_dir &lt;pathname&gt; &lt;old-symlink-target&gt; [&lt;last-version&gt; [&lt;package&gt;]]
	Replace a symlink with a directory. Must be called in preinst,
	postinst and postrm.
  dir_to_symlink &lt;pathname&gt; &lt;new-symlink-target&gt; [&lt;last-version&gt; [&lt;package&gt;]]
	Replace a directory with a symlink. Must be called in preinst,
	postinst and postrm.
  help
	Display this usage information.
END
}

badusage() {
	echo &quot;$PROGNAME: error: $1&quot; &gt;&amp;2
	echo &gt;&amp;2
	echo &quot;Use '$PROGNAME help' for program usage information.&quot; &gt;&amp;2
	exit 1
}

# Main code
set -e

PROGNAME=$(basename &quot;$0&quot;)
version=&quot;1.18.25&quot;
command=&quot;$1&quot;
[ $# -gt 0 ] || badusage &quot;missing command&quot;
shift

case &quot;$command&quot; in
supports)
	case &quot;$1&quot; in
	rm_conffile|mv_conffile|symlink_to_dir|dir_to_symlink)
		code=0
		;;
	*)
		code=1
		;;
	esac
	if [ -z &quot;$DPKG_MAINTSCRIPT_NAME&quot; ]; then
		warning &quot;environment variable DPKG_MAINTSCRIPT_NAME missing&quot;
		code=1
	fi
	if [ -z &quot;$DPKG_MAINTSCRIPT_PACKAGE&quot; ]; then
		warning &quot;environment variable DPKG_MAINTSCRIPT_PACKAGE missing&quot;
		code=1
	fi
	exit $code
	;;
rm_conffile)
	rm_conffile &quot;$@&quot;
	;;
mv_conffile)
	mv_conffile &quot;$@&quot;
	;;
symlink_to_dir)
	symlink_to_dir &quot;$@&quot;
	;;
dir_to_symlink)
	dir_to_symlink &quot;$@&quot;
	;;
_internal_pkg_must_own_file)
	# This is an internal command, must not be used outside this program.
	internal_pkg_must_own_file &quot;$@&quot;
	;;
--help|help|-?)
	usage
	;;
--version)
	cat &lt;&lt;-END
	Debian $PROGNAME version $version.

	This is free software; see the GNU General Public License version 2 or
	later for copying conditions. There is NO warranty.
	END
	;;
*)
	badusage &quot;command $command is unknown
Hint: upgrading dpkg to a newer version might help.&quot;
esac

exit 0
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