#!/bin/bash
#
# Nextcloud software upgrader.
# See https://docs.nextcloud.com/server/16/admin_manual/maintenance/upgrade.html
#

# Config parameters
BASENAME="`basename $0`"
OLD_VERSION="$1"
VERSION="$2"

# Syntax check
if [ -z "$2" ]; then
  echo "usage: $BASENAME <old-version> <new-version>"
  exit 1
fi

# Check installed versions
if [ ! -d "nextcloud-$OLD_VERSION" ]; then
  echo "error: nextcloud-$OLD_VERSION is not installed, aborting."
  exit 1
elif [ -d "nextcloud-$VERSION" ]; then
  echo "error: nextcloud-$VERSION already installed, aborting."
  exit 1
fi

# Download package
wget -c https://download.nextcloud.com/server/releases/nextcloud-$VERSION.tar.bz2 || exit 1
wget -c https://download.nextcloud.com/server/releases/nextcloud-$VERSION.tar.bz2.sha256 || exit 1
sha256sum -c nextcloud-$VERSION.tar.bz2.sha256 || exit -1

# Decompress
(
  mkdir tmp
  cd tmp
  tar xvf ../nextcloud-$VERSION.tar.bz2
  mv nextcloud ../nextcloud-$VERSION
  cd ..
  rmdir tmp
)

# Remove package
rm nextcloud-$VERSION.tar.bz2
rm nextcloud-$VERSION.tar.bz2.sha256

# Sync configuration and data
chown -R root: nextcloud-$VERSION
rsync -av nextcloud-$OLD_VERSION/config/ nextcloud-$VERSION/config/
rsync -av nextcloud-$OLD_VERSION/data/ nextcloud-$VERSION/data/

# Symlink to contrib content
#(
#  cd nextcloud-$VERSION
#  ln -s ../contrib
#  rm -rf themes
#  ln -s contrib/themes
#)

# Pivot
rm nextcloud && ln -s nextcloud-$VERSION nextcloud

# Audit
echo "Audit:" && \
du -hs nextcloud-$OLD_VERSION && \
du -hs nextcloud-$VERSION

# Finish
echo "Please fix config.php manually."