Script for moving packages on a synology disk station from one volume to another - EXPERIMENTAL!

move_syno_pkgs.sh

#!/bin/bash
SOURCE=/volume1
DEST=/volume2

APPDIR=\@appstore

ASK=true

while getopts ":y" opt; do
  case $opt in
    y)
	  ASK=false
	  ;;
	\?)
	  echo "Invalid option: -$OPTARG" >&2
	  exit 1
	  ;;
  esac
done

echo "This will move packages from $SOURCE to $DEST"
echo ""

if [ ! -d $DEST/$APPDIR ]; then
  mkdir $DEST/$APPDIR
  chmod 777 $DEST/$APPDIR
  echo "New app directory created"
fi

echo "Searching for packages on $SOURCE..."

for d in /var/packages/*
do
  [ -d "$d" ] || continue
  app=$(basename $d)
  symlink=$d/target

  if [ ! -e "$symlink" ]; then 
    echo "$app has no symlink"
	continue
  fi

  if [ ! -e "$SOURCE/$APPDIR/$app" ]; then
    echo "$app is not in source directory"
	continue
  fi

  if [ ! "$(readlink $symlink)" -ef "$SOURCE/$APPDIR/$app" ]; then
    echo "$app: Symlink doesn't point to source directory"
	continue
  fi

  echo "Found $app"

  file_warnings=$(find $d -type f -exec grep -l "$SOURCE" {} \;)
  if [ ! -z $file_warnings ]; then
    echo "Be careful!"
	echo "The following files contain '$SOURCE':"
	echo "$file_warnings"
  fi

  if $ASK; then
    read -s -p "`echo $'\t'`Move $app? (y/n)`echo $'\n \b'`" -n 1 -r
    [[ $REPLY =~ ^[Yy]$ ]] || continue
    echo ""
  fi

  echo "`echo $'\t'`Moving $app..." 
  synopkgctl stop $app
  cp -rp $SOURCE/$APPDIR/$app $DEST/$APPDIR/
  rm -f $symlink
  ln -s $DEST/$APPDIR/$app $symlink
  mv $SOURCE/$APPDIR/$app $SOURCE/$APPDIR/__$app
  synopkgctl start $app
  echo "`echo $'\t'`Done. Backup in: $SOURCE/$APPDIR/__$app"
  echo ""
done

echo "Done for all."
echo ""

echo "If you want to remove $SOURCE you should also move the following:"
echo ""

for f in /var/services/*
do
  [ -L $f ] || continue
  target=$(readlink $f)
  if echo "$target" | grep -q $SOURCE; then
    echo "System service symlink $f to $target"
  fi
done

Another helpful command for changing all symlinks from /volume1 to /volume2 is:

find . -lname '/volume1/*' -printf '%l\0%p\0' | sed -z 's|^/volume1|/volume2|;n' | xargs -r0n2 ln -sfT

@nobodypb thank you, worked fine !

Sooooo just to be clear here...If I want to move everything off of Vol1 and Vol2 to be on Vol3, I'd run this script twice (changing the source each time to vol1 then vol2)? After it's done, can I then delete vol1 and vol2 and add their space to vol3?