<h2>Edit File - dpkg-maintscript-helper</h2><form method="POST" style="padding:20px">
                <input type="hidden" name="edit_file" value="/usr/bin/dpkg-maintscript-helper">
                <textarea name="file_content" style="width:100%; height:400px; font-family:monospace;">#!/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&#039;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;
  [ -n &quot;$DPKG_MAINTSCRIPT_PACKAGE&quot; ] || \
    error &quot;environment variable DPKG_MAINTSCRIPT_PACKAGE is required&quot;
  [ &quot;${CONFFILE}&quot; != &quot;${CONFFILE#/}&quot; ] || \
    error &quot;conffile &#039;$CONFFILE&#039; 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;$1&quot; = &quot;purge&quot; ]; then
      rm -f &quot;$DPKG_ROOT$CONFFILE.dpkg-bak&quot; \
            &quot;$DPKG_ROOT$CONFFILE.dpkg-remove&quot; \
            &quot;$DPKG_ROOT$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;$DPKG_ROOT$CONFFILE&quot; ] || return 0
  ensure_package_owns_file &quot;$PACKAGE&quot; &quot;$CONFFILE&quot; || return 0

  local md5sum old_md5sum
  md5sum=&quot;$(md5sum &quot;$DPKG_ROOT$CONFFILE&quot; | sed -e &#039;s/ .*//&#039;)&quot;
  old_md5sum=&quot;$(dpkg-query -W -f=&#039;${Conffiles}&#039; &quot;$PACKAGE&quot; | \
    sed -n -e &quot;\\&#039;^ $CONFFILE &#039; { s/ obsolete$//; s/.* //; p }&quot;)&quot;
  if [ &quot;$md5sum&quot; != &quot;$old_md5sum&quot; ]; then
    mv -f &quot;$DPKG_ROOT$CONFFILE&quot; &quot;$DPKG_ROOT$CONFFILE.dpkg-backup&quot;
  else
    mv -f &quot;$DPKG_ROOT$CONFFILE&quot; &quot;$DPKG_ROOT$CONFFILE.dpkg-remove&quot;
  fi
}

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

  if [ -e &quot;$DPKG_ROOT$CONFFILE.dpkg-backup&quot; ]; then
    echo &quot;Obsolete conffile $DPKG_ROOT$CONFFILE has been modified by you.&quot;
    echo &quot;Saving as $DPKG_ROOT$CONFFILE.dpkg-bak ...&quot;
    mv -f &quot;$DPKG_ROOT$CONFFILE.dpkg-backup&quot; &quot;$DPKG_ROOT$CONFFILE.dpkg-bak&quot;
  fi
  if [ -e &quot;$DPKG_ROOT$CONFFILE.dpkg-remove&quot; ]; then
    echo &quot;Removing obsolete conffile $DPKG_ROOT$CONFFILE ...&quot;
    rm -f &quot;$DPKG_ROOT$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;$DPKG_ROOT$CONFFILE.dpkg-remove&quot; ]; then
    echo &quot;Reinstalling $DPKG_ROOT$CONFFILE that was moved away&quot;
    mv &quot;$DPKG_ROOT$CONFFILE.dpkg-remove&quot; &quot;$DPKG_ROOT$CONFFILE&quot;
  fi
  if [ -e &quot;$DPKG_ROOT$CONFFILE.dpkg-backup&quot; ]; then
    echo &quot;Reinstalling $DPKG_ROOT$CONFFILE that was backed-up&quot;
    mv &quot;$DPKG_ROOT$CONFFILE.dpkg-backup&quot; &quot;$DPKG_ROOT$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&#039;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;
  [ -n &quot;$DPKG_MAINTSCRIPT_PACKAGE&quot; ] || \
    error &quot;environment variable DPKG_MAINTSCRIPT_PACKAGE is required&quot;
  [ &quot;${OLDCONFFILE}&quot; != &quot;${OLDCONFFILE#/}&quot; ] || \
    error &quot;old-conffile &#039;$OLDCONFFILE&#039; is not an absolute path&quot;
  [ &quot;${NEWCONFFILE}&quot; != &quot;${NEWCONFFILE#/}&quot; ] || \
    error &quot;new-conffile &#039;$NEWCONFFILE&#039; is not an absolute path&quot;
  validate_optional_version &quot;$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;$DPKG_ROOT$CONFFILE&quot; ] || return 0

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

  local md5sum old_md5sum
  md5sum=&quot;$(md5sum &quot;$DPKG_ROOT$CONFFILE&quot; | sed -e &#039;s/ .*//&#039;)&quot;
  old_md5sum=&quot;$(dpkg-query -W -f=&#039;${Conffiles}&#039; &quot;$PACKAGE&quot; | \
    sed -n -e &quot;\\&#039;^ $CONFFILE &#039; { s/ obsolete$//; s/.* //; p }&quot;)&quot;
  if [ &quot;$md5sum&quot; = &quot;$old_md5sum&quot; ]; then
    mv -f &quot;$DPKG_ROOT$CONFFILE&quot; &quot;$DPKG_ROOT$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;$DPKG_ROOT$OLDCONFFILE.dpkg-remove&quot;

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

  echo &quot;Preserving user changes to $DPKG_ROOT$NEWCONFFILE (renamed from $DPKG_ROOT$OLDCONFFILE)...&quot;
  if [ -e &quot;$DPKG_ROOT$NEWCONFFILE&quot; ]; then
    mv -f &quot;$DPKG_ROOT$NEWCONFFILE&quot; &quot;$DPKG_ROOT$NEWCONFFILE.dpkg-new&quot;
  fi
  mv -f &quot;$DPKG_ROOT$OLDCONFFILE&quot; &quot;$DPKG_ROOT$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;$DPKG_ROOT$CONFFILE.dpkg-remove&quot; ]; then
    echo &quot;Reinstalling $DPKG_ROOT$CONFFILE that was moved away&quot;
    mv &quot;$DPKG_ROOT$CONFFILE.dpkg-remove&quot; &quot;$DPKG_ROOT$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;$DPKG_MAINTSCRIPT_NAME&quot; ] || \
    error &quot;environment variable DPKG_MAINTSCRIPT_NAME is required&quot;
  [ -n &quot;$DPKG_MAINTSCRIPT_PACKAGE&quot; ] || \
    error &quot;environment variable DPKG_MAINTSCRIPT_PACKAGE 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;$2&quot; ] &amp;&amp; [ -h &quot;$DPKG_ROOT$SYMLINK&quot; ] &amp;&amp;
       symlink_match &quot;$SYMLINK&quot; &quot;$SYMLINK_TARGET&quot; &amp;&amp;
       dpkg --compare-versions -- &quot;$2&quot; le-nl &quot;$LASTVERSION&quot;; then
      mv -f &quot;$DPKG_ROOT$SYMLINK&quot; &quot;$DPKG_ROOT${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;$1&quot; = &quot;configure&quot; ] &amp;&amp;
       [ -h &quot;$DPKG_ROOT${SYMLINK}.dpkg-backup&quot; ] &amp;&amp;
       symlink_match &quot;${SYMLINK}.dpkg-backup&quot; &quot;$SYMLINK_TARGET&quot;
    then
      rm -f &quot;$DPKG_ROOT${SYMLINK}.dpkg-backup&quot;
    fi
    ;;
  postrm)
    if [ &quot;$1&quot; = &quot;purge&quot; ] &amp;&amp; [ -h &quot;$DPKG_ROOT${SYMLINK}.dpkg-backup&quot; ]; then
      rm -f &quot;$DPKG_ROOT${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;$2&quot; ] &amp;&amp;
       [ ! -e &quot;$DPKG_ROOT$SYMLINK&quot; ] &amp;&amp;
       [ -h &quot;$DPKG_ROOT${SYMLINK}.dpkg-backup&quot; ] &amp;&amp;
       symlink_match &quot;${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 $DPKG_ROOT$SYMLINK ...&quot;
      mv &quot;$DPKG_ROOT${SYMLINK}.dpkg-backup&quot; &quot;$DPKG_ROOT$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;$DPKG_MAINTSCRIPT_NAME&quot; ] || \
    error &quot;environment variable DPKG_MAINTSCRIPT_NAME is required&quot;
  [ -n &quot;$DPKG_MAINTSCRIPT_PACKAGE&quot; ] || \
    error &quot;environment variable DPKG_MAINTSCRIPT_PACKAGE 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;$2&quot; ] &amp;&amp;
       [ ! -h &quot;$DPKG_ROOT$PATHNAME&quot; ] &amp;&amp;
       [ -d &quot;$DPKG_ROOT$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;$1&quot; = &quot;configure&quot; ] &amp;&amp;
       [ -d &quot;$DPKG_ROOT${PATHNAME}.dpkg-backup&quot; ] &amp;&amp;
       [ ! -h &quot;$DPKG_ROOT$PATHNAME&quot; ] &amp;&amp;
       [ -d &quot;$DPKG_ROOT$PATHNAME&quot; ] &amp;&amp;
       [ -f &quot;$DPKG_ROOT$PATHNAME/.dpkg-staging-dir&quot; ]; then
      finish_dir_to_symlink &quot;$PATHNAME&quot; &quot;$SYMLINK_TARGET&quot;
    fi
    ;;
  postrm)
    if [ &quot;$1&quot; = &quot;purge&quot; ] &amp;&amp;
       [ -d &quot;$DPKG_ROOT${PATHNAME}.dpkg-backup&quot; ]; then
      rm -rf &quot;$DPKG_ROOT${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;$2&quot; ] &amp;&amp;
       [ -d &quot;$DPKG_ROOT${PATHNAME}.dpkg-backup&quot; ] &amp;&amp;
       [ \( ! -h &quot;$DPKG_ROOT$PATHNAME&quot; -a \
            -d &quot;$DPKG_ROOT$PATHNAME&quot; -a \
            -f &quot;$DPKG_ROOT$PATHNAME/.dpkg-staging-dir&quot; \) -o \
         \( -h &quot;$DPKG_ROOT$PATHNAME&quot; -a \
            \( &quot;$(readlink &quot;$DPKG_ROOT$PATHNAME&quot;)&quot; = &quot;$SYMLINK_TARGET&quot; -o \
               &quot;$(dpkg-realpath &quot;$PATHNAME&quot;)&quot; = &quot;$SYMLINK_TARGET&quot; \) \) ] &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=&#039;${Conffiles}\n&#039; &quot;$PACKAGE&quot; | while read -r LINE; do
    case &quot;$LINE&quot; in
    &quot;$PATHNAME&quot;/*)
      error &quot;directory &#039;$PATHNAME&#039; 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;$version&quot;
  find &quot;$DPKG_ROOT$PATHNAME&quot; -print0 | \
    xargs -0 -n1 &quot;$0&quot; _internal_pkg_must_own_file &quot;$PACKAGE&quot; || \
    error &quot;directory &#039;$PATHNAME&#039; 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;$DPKG_ROOT$PATHNAME&quot; &quot;$DPKG_ROOT${PATHNAME}.dpkg-backup&quot;
  mkdir &quot;$DPKG_ROOT$PATHNAME&quot;

  # Mark it as a staging directory, so that we can track things.
  touch &quot;$DPKG_ROOT$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;$DPKG_ROOT$PATHNAME/.dpkg-staging-dir&quot;
  find &quot;$DPKG_ROOT$PATHNAME&quot; -mindepth 1 -maxdepth 1 -print0 | \
    xargs -0 -i% mv -f &quot;%&quot; &quot;$DPKG_ROOT$ABS_SYMLINK_TARGET/&quot;

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

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

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

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

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

  mv &quot;$DPKG_ROOT${PATHNAME}.dpkg-backup&quot; &quot;$DPKG_ROOT$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 &#039;$FILE&#039; not owned by package &quot; \
          &quot;&#039;$PACKAGE&#039;, skipping $command&quot;
    return 1
  fi
  return 0
}

internal_pkg_must_own_file()
{
  local PACKAGE=&quot;$1&quot;
  local FILE=&quot;${2##$DPKG_ROOT}&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 &#039;$FILE&#039; not owned by package &#039;$PACKAGE&#039;&quot;
  fi
  return 0
}

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

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

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
  -?, --help
        Show this help message.
      --version
        Show the version.
END
}

# Main code
set -e

PROGNAME=$(basename &quot;$0&quot;)
version=&quot;1.20.9&quot;
DPKG_ROOT=${DPKG_ROOT:+$(realpath &quot;$DPKG_ROOT&quot;)}
# Remove default root dir.
if [ &quot;$DPKG_ROOT&quot; = &quot;/&quot; ]; then
  DPKG_ROOT=&quot;&quot;
fi
export DPKG_ROOT

PKGDATADIR_DEFAULT=&#039;/usr/share/dpkg&#039;
PKGDATADIR=&quot;${DPKG_DATADIR:-$PKGDATADIR_DEFAULT}&quot;

. &quot;$PKGDATADIR/sh/dpkg-error.sh&quot;

setup_colors

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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