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#!/bin/sh
#
# Overall, this script works quite nicely, but please help to
# make this script more robust!

# Testers: need help to ensure this script remains POSIX compliant.
# Some distros do not use bash as a default shell.

#===============================================================
# This is a modest attempt to migrate a KDE3 profile to Trinity.
# If $HOME/.trinity exists then skip this one-time migration.

# Can this script be run from within starttde?
# Challenge: to run this script from within starttde requires
# graphical dialog boxes. When is the underlying TDE system
# sufficiently operational in the starttde script to use KDialog?
# If KDialog is unavailable then that leaves xmessage, which is
# ugly although possibly adequate.

# If KDialog is unavailable until after $HOME/.trinity exists, such
# as after running KPersonalizer, then this script will not help.
# Also, KPersonalizer automatically creates a skeleton profile directory
# when launched, as does some command line tools such as kconf_update.
#
# Additionally, this script was written mainly from a command line
# login perspective. This script and concept needs testing and
# improvements to support graphical login systems.

#===============================================================
# Known Quirks:
# When testing the same user account between two different systems, such
# as a real and virtual machine or two different physical machines,
# after a migration KMix is always muted because the sound devices differ.

# Not sure, but forced window sizes saved in kwinrulesc seem to break after
# a migration.
#===============================================================

Wait_For_Response () {
unset response
# -r Backslash does not act as an escape character.
# -p Display "PROMPT" without a trailing newline, before attempting to read any input.
while true; do
  read -r -p "$1 (y/n): " yn
  case $yn in
    [Yy]* ) response=y; break;;
    [Nn]* ) response=n; break;;
    * ) echo "Please answer yes (y/Y) or no (n/N).";;
  esac
done
}

Proceed_From_Response () {
if [ "$response" = "n" -o "$response" = "N" ]; then
  echo "Exiting."
  echo
  exit 0
else
  echo "Continuing."
  echo
fi
}

# Need help here to make the disk space test more robust!
disk_space_test () {
echo
echo "Testing available disk space."
# Find the remaining space on the partition.
AVAILABLE="`df $HOME/$KDE3_PROFILE | grep '\/' | awk '{print $4}'`"
# Find the size of the profile directory.
PROFILE_SIZE="`du -s $HOME/$KDE3_PROFILE | awk '{print $1}'`"
# Determine remaining partition space after migrating.
REMAINING_SPACE=$(($AVAILABLE - $PROFILE_SIZE))
# Convert to human friendly numbers (MBs).
PROFILE_SIZE="`echo \"${PROFILE_SIZE} / 1024\" | bc`"
REMAINING_SPACE="`echo \"$REMAINING_SPACE / 1024\" | bc`"
# Let the user know the results.
echo "Remaining disk space: ${REMAINING_SPACE} MB"
echo "Space required for new profile: ${PROFILE_SIZE} MB"
# If obvious insufficient space then inform and quit.
if [ $PROFILE_SIZE -gt $REMAINING_SPACE ]; then
  echo "Insufficient disk space. Exiting."
  echo
  exit 0
else
  echo "Sufficient disk space exists. Continuing."
  echo
fi
# Ask whether to proceed.
# Wait_For_Response "Migrate?"
# Proceed_From_Response
# User wants to migrate.
echo "Migrating an existing KDE3 profile directory:" 1>&2
echo "Copying \$HOME/$KDE3_PROFILE to \$HOME/.trinity." 1>&2
cp -a $HOME/$KDE3_PROFILE $HOME/.trinity
}

# Avoid any possible conflict with KDE4. Therefore within this script
# use full path names to all binaries used.

# The binaries for TDE are located in the same place as this script.
# To determine that location use the following method rather than presuming
# the existence of $TDEDIR. That environment variable might not be
# defined or defined to point to KDE4 binaries.
BIN_DIR="`dirname \`readlink -f $0\``"
if [ -x $BIN_DIR/tde-config ]; then
  TDE_VERSION="`$BIN_DIR/tde-config --version | grep TDE | awk '{print $2}'`"
  echo "Trinity Desktop Environment version is $TDE_VERSION" 1>&2
  export TDEDIR=${BIN_DIR%/bin}
  echo "Trinity Desktop Environment base directory is $TDEDIR" 1>&2
else
  # This might be a Trinity version before kde-config was renamed to tde-config.
  # Don't use kde-config because of a bug that always creates a $TDEHOME directory.
  if [ -x $BIN_DIR/konqueror ]; then
    TDE_VERSION="`$BIN_DIR/konqueror --version | grep KDE | awk '{print $2}'`"
    echo "Trinity Desktop Environment version is $TDE_VERSION" 1>&2
    export TDEDIR=${BIN_DIR%/bin}
    echo "Trinity Desktop Environment base directory is $TDEDIR" 1>&2
  else
    echo "Unable to determine the TDE bin directory, where this script should be installed."
    echo "This script should be installed in the same directory."
    echo "Exiting."
    exit 1
  fi
fi
unset BIN_DIR

echo
echo "This script migrates an existing KDE3 profile directory."
echo "The KDE3 profile directory will be copied/duplicated"
echo "and then cleaned/scrubbed to remove remnants of KDE3."
echo "KMail config files will be scrubbed but not the mail files."
echo "The result is a new Trinity profile directory. :-)"
echo

# We need to make this first test more robust. Some TDE tools create
# a skeleton profile directory ($TDEHOME/share/config) with no files.
# Thus, the mere existence of $HOME/.trinity will cause this script
# to terminate despite an existing profile directory possibly being
# nothing more than a skeleton. Possibly like the KDE4 profile directory
# test below, we can test for several knowable TDE files that also don't
# exist in KDE4. If those files don't exist then presume a skeleton
# profile directory.
# Do not migrate when $TDEHOME is a sym link to another profile directory.
# Trinity should have full reign within its own profile directory
# (limited to administrative locking), but an error check is a
# conservative approach.
TDEHOME_LINK="`readlink \"$HOME/.trinity\"`"
if [ "$TDEHOME_LINK" != "" ]; then
  echo "Warning! The profile directory $HOME/.trinity is a" 1>&2
  echo "sym link to $TDEHOME_LINK!" 1>&2
  echo "Please break this sym link to perform the profile migration." 1>&2
  echo
  Wait_For_Response "Break the sym link now and continue with migrating?"
  Proceed_From_Response
  unlink "$HOME/.trinity" 2>/dev/null
  if [ "`readlink \"$HOME/.trinity\"`" != "" ]; then
    echo "Unable to break the sym link. Check your file and directory privileges. Quitting."
    unset KDE3_PROFILE
    unset TDEHOME_LINK
    exit 0
  fi
fi

if [ -d "$HOME/.trinity" ]; then
  echo "$HOME/.trinity already exists." 1>&2
  echo "No migration required, but running to update an older Trinity profile." 1>&2
  echo
  KDE3_PROFILE=".trinity"
else
  echo "$HOME/.trinity does not exist." 1>&2
  # If $HOME/.kde3 or $HOME/.kdemod3 exists, probably safe to presume a profile from KDE3 or a previous Trinity.
  if [ -d "$HOME/.kde3" ]; then
    echo "Found $HOME/.kde3."
    KDE3_PROFILE=".kde3"
    disk_space_test
  elif [ -d "$HOME/.kdemod3" ]; then
    echo "Found $HOME/.kdemod3."
    KDE3_PROFILE=".kdemod3"
    disk_space_test
  elif [ -d "$HOME/.kde" ]; then
    # This is tricky --- ensure this profile directory is NOT KDE4.
    echo "Found $HOME/.kde."
    if [ ! -d $HOME/.kde/share/kde4 ] && \
      [ ! -f $HOME/.kde/share/config/nepomukserverrc ] && \
      [ ! -f $HOME/.kde/share/config/phonondevicesrc ] && \
      [ ! -f $HOME/.kde/share/config/plasma-desktop-appletsrc ] && \
      [ ! -f $HOME/.kde/share/config/specialmailcollectionsrc ]; then
      # That was five different tests. Probably not a KDE4 profile. There is a chance
      # the user's KDE3 profile got contaminated testing KDE4. If that is the case then
      # too bad --- the safe route here is not to migrate. Otherwise if this 5-point
      # test passes then migrate the profile.
      KDE3_PROFILE=".kde"
      echo "$HOME/$KDE3_PROFILE does not look like a KDE4 profile directory."
      disk_space_test
    else
        echo "$HOME/.kde probably is a KDE4 profile directory."
    fi
  else
    echo "Found no KDE3 profile directory to migrate." 1>&2
  fi
fi

if [ -n "$KDE3_PROFILE" ] && [ -d "$KDE3_PROFILE" ]; then
  # Remove any KDE3 "contamination."

  echo "Cleaning temp file locations." 1>&2
  CACHE_DIR="`readlink $HOME/.trinity/cache-\`uname -n\``"
  SOCKET_DIR="`readlink $HOME/.trinity/socket-\`uname -n\``"
  TMP_DIR="`readlink $HOME/.trinity/tmp-\`uname -n\``"
  rm -f ${CACHE_DIR}/ksycoca* 2>/dev/null
  mkdir `dirname $CACHE_DIR`/tdecache-$USER 2>/dev/null
  cp -a $CACHE_DIR/* `dirname $CACHE_DIR`/tdecache-$USER/ 2>/dev/null
  unlink $HOME/.trinity/cache-`uname -n`
  ln -s `dirname $CACHE_DIR`/tdecache-$USER $HOME/.trinity/cache-`uname -n`
  unlink $HOME/.trinity/socket-`uname -n` 2>/dev/null
  unlink $HOME/.trinity/tmp-`uname -n` 2>/dev/null

  # Fix config files.
  # Exclude KMail mail files --- we don't want to touch those files.
  # I'm using maildir --- do these commands work for mbox too?
  echo "Cleaning config files (but not KMail mail files. :-))" 1>&2
  echo "Cleaning, first pass..." 1>&2
  find $HOME/.trinity -path $HOME/.trinity/share/apps/kmail/mail -prune -o -type f -exec sed -i "s|/${KDE3_PROFILE}|/\.trinity|g" {} \;
  EXIT_CODE="$?"
  if [ "$EXIT_CODE" = "0" ]; then
    echo "Done." 1>&2
  else
    echo "There was an error with the first pass." 1>&2
  fi
  # What if $TDEDIR is not defined? Bummer.
  if [ -z "$TDEDIR" ]; then
    echo "The \$TDEDIR environment variable does not exist. Cannot complete the second pass." 1>&2
  else
    echo "Cleaning, second pass..." 1>&2
    find $HOME/.trinity -path $HOME/.trinity/share/apps/kmail/mail -prune -o -type f -exec sed -i "s|/opt/kde/|${TDEDIR}/|g" {} \;
    EXIT_CODE_1="$?"
    find $HOME/.trinity -path $HOME/.trinity/share/apps/kmail/mail -prune -o -type f -exec sed -i "s|/opt/kde3/|${TDEDIR}/|g" {} \;
    EXIT_CODE_2="$?"
    if [ "$EXIT_CODE_1" = "0" ] && [ "$EXIT_CODE_2" = "0" ]; then
      echo "Done." 1>&2
    else
      echo "There was an error with the second pass." 1>&2
  fi
    echo "Cleaning, third pass..." 1>&2
    # Prevent an anomaly with the kicker Firefox icon. Firefox likely is installed to /usr.
    # The following update will change that to /opt/trinity. We need to restore that location.
    KICKER_FIREFOX="$HOME/$KDE3_PROFILE/share/apps/kicker/mozilla-firefox.desktop"
    if [ -e "$KICKER_FIREFOX" ]; then
      FIREFOX_PNG_LOCATION="`grep \"Icon=\" \"$KICKER_FIREFOX\"`"
    fi
    find $HOME/.trinity -path $HOME/.trinity/share/apps/kmail/mail -prune -o -type f -exec sed -i "s|/usr/share/|${TDEDIR}/share/|g" {} \;
    if [ "$?" = "0" ]; then
      if [ "$FIREFOX_PNG_LOCATION" != "" ]; then
        FIREFOX_PNG_LOCATION_NEW="`grep \"Icon=\" \"$HOME/.trinity/share/apps/kicker/mozilla-firefox.desktop\"`"
        sed -i "s|$FIREFOX_PNG_LOCATION_NEW|$FIREFOX_PNG_LOCATION|" $HOME/.trinity/share/apps/kicker/mozilla-firefox.desktop
      fi
      echo "Done." 1>&2
    else
      echo "There was an error with the third pass." 1>&2
    fi
  fi
  # Need to update files in $HOME/.trinity/Autostart.
  # Some files might be *.desktop files and can be cleaned in place.
  # Some files might be sym links to a previous KDE3 location.
  # Recreate those links to the correct Trinity location.
  # This needs improvement for apps not in /usr/bin.
  echo "Attempting to update *.desktop files in Autostart." 1>&2
  find $HOME/.trinity/Autostart -! -type l -type f -exec sed -i "s|/usr/bin/|${TDEDIR}/bin/|g" {} \;
  echo "Attempting to update sym links in Autostart." 1>&2
  ( cd $HOME/.trinity/Autostart
    for i in `find . -type l`; do
      LINK="`readlink $i`"
      echo "Found a sym link to $LINK." 1>&2
      LINK_PATH="`dirname $LINK`"
      LINK_NAME="`basename $LINK`"
      if [ -n "`echo $LINK_PATH | grep \"/usr\"`" ]; then
        echo "Sym link points to /usr." 1>&2
        NEW_LINK_PATH="`echo $LINK_PATH | sed \"s|/usr|${TDEDIR}|\"`"
      elif [ -n "`echo $LINK_PATH | grep \"/opt/kde\"`" ]; then
        echo "Sym link points to /opt/kde." 1>&2
        NEW_LINK_PATH="`echo $LINK_PATH | sed \"s|/opt/kde|${TDEDIR}|\"`"
      elif [ -n "`echo $LINK_PATH | grep \"/opt/kde3\"`" ]; then
        echo "Sym link points to /opt/kde3." 1>&2
        NEW_LINK_PATH="`echo $LINK_PATH | sed \"s|/opt/kde3|${TDEDIR}|\"`"
      elif [ -n "`echo $LINK_PATH | grep \"${TDEDIR}\"`" ]; then
        echo "Sym link points to ${TDEDIR}." 1>&2
      else
        echo "Cannot establish a path for a new link." 1>&2
      fi
      if [ "$NEW_LINK_PATH" != "" ] && [ "$LINK_NAME" != "" ]; then
        unlink $i
        echo "Attempting to create a sym link to $NEW_LINK_PATH/$LINK_NAME." 1>&2
        ln -sf $NEW_LINK_PATH/$LINK_NAME $LINK_NAME
        if [ "$?" = "0" ]; then
          echo "Link created." 1>&2
        else
          echo "There was an error with creating the link." 1>&2
        fi
      else
        echo "Not updating the link."
      fi
    done
    if [ -f kmix.desktop ]; then
      $TDEDIR/bin/kwriteconfig --file kmixrc --key Autostart --type bool "true"
    fi
    rm -f kmix.desktop
  )

  if [ -d $HOME/.trinity/share/services/kded ]; then
    if [ "`find $HOME/.trinity/share/services/kded -name *.desktop`" != "" ]; then
      echo "Validating KDED services."
      for i in `/bin/ls -1 $HOME/.trinity/share/services/kded/*.desktop`; do
        SERVICE_NAME=`basename $i`
        if [ ! -f $TDEDIR/share/services/kded/$SERVICE_NAME ]; then
          $TDEDIR/bin/kwriteconfig --file $i --group "Desktop Entry" --key "X-KDE-Kded-autoload" --type bool "false"
        fi
      done
    fi
  fi
  echo "Renaming various configuration files and directories."
  # Don't force renaming in case this cript is used to update an existing Trinity profile.
  if [ -f $TDEDIR/bin/chalk ]; then
    echo "  krita->chalk"
    mv $HOME/.trinity/share/config/kritarc $HOME/.trinity/share/config/chalkrc 2>/dev/null
    mv $HOME/.trinity/share/apps/krita $HOME/.trinity/share/apps/chalk 2>/dev/null
  fi
  if [ -d /opt/trinity/include/tdeprint ]; then
    echo "  kdeprint->tdeprint"
    mv $HOME/.trinity/share/config/kdeprintrc $HOME/.trinity/share/config/tdeprintrc 2>/dev/null
    mv $HOME/.trinity/share/apps/kdeprint $HOME/.trinity/share/apps/tdeprint 2>/dev/null
  fi
  if [ -f $TDEDIR/bin/tdesu ]; then
    echo "  kdesurc->tdesurc"
    mv $HOME/.trinity/share/config/kdesurc $HOME/.trinity/share/config/tdesurc 2>/dev/null
  fi
  if [ -f $TDEDIR/bin/tdevelop ]; then
    echo "  kdevelop->tdevelop"
    mv $HOME/.trinity/share/config/kdeveloprc $HOME/.trinity/share/config/tdeveloprc 2>/dev/null
  fi
  if [ -f $TDEDIR/bin/twin ]; then
    echo "  kwin->twin"
    mv $HOME/.trinity/share/config/kwinrc $HOME/.trinity/share/config/twinrc 2>/dev/null
    mv $HOME/.trinity/share/config/kwinrc.eventsrc $HOME/.trinity/share/config/twinrc.eventsrc 2>/dev/null
    mv $HOME/.trinity/share/config/kwinrc $HOME/.trinity/share/config/twinrc 2>/dev/null
    mv $HOME/.trinity/share/apps/kwinrulesrc $HOME/.trinity/share/apps/twinrulesrc 2>/dev/null
  fi
  if [ -f $TDEDIR/bin/twin4 ]; then
    echo "  kwin4->twin4"
    mv $HOME/.trinity/share/config/kwin4rc $HOME/.trinity/share/config/twin4rc 2>/dev/null
  fi
  # Note: Don't run kconf_update, which is run automatically when starting TDE.
  # Note: Don't run any profile R14 updates: starttde does that through the r14-xdg-update script.
  echo
  echo "Done!" 1>&2
  echo
  echo "If any button icons to non Trinity apps in the kicker/panel"
  echo "or system tray are incorrect, select the correct icon from the"
  echo "button's configure menu option. The button's path to the app should"
  echo "remain correct. (Note: please report any such anomalies.)"
fi
echo

unset KDE3_PROFILE
unset TDEHOME_LINK
unset KICKER_FIREFOX
unset FIREFOX_PNG_LOCATION
unset FIREFOX_PNG_LOCATION_NEW