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diff --git a/nextcloud-dl b/nextcloud-dl
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+#!/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-$VERSION.tar.bz2
+
+# Sync configuration
+chown -R root. nextcloud-$VERSION
+rsync -av nextcloud-$OLD_VERSION/config/ nextcloud-$VERSION/config/
+
+# 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."