publish some update scripts

hedgedoc-update.sh

@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+APP_NAME=HedgeDoc
+ORG=hedgedoc # Organisation or GitHub user
+REPO=hedgedoc
+LOCAL_VERSION=$(jq --raw-output .version ~/hedgedoc/package.json)
+LATEST_VERSION=$(curl --silent https://api.github.com/repos/$ORG/$REPO/releases/latest |
+  jq --raw-output .tag_name)
+
+function do_upgrade() {
+  supervisorctl stop $APP_NAME
+  echo "waiting 1 minute until all processes are stopped"
+  sleep 1m
+  mv --verbose ~/hedgedoc ~/hedgedoc_"$LOCAL_VERSION"
+  VERSION=$LATEST_VERSION
+  cd || exit
+  wget https://github.com/hedgedoc/hedgedoc/releases/download/"$VERSION"/hedgedoc-"$VERSION".tar.gz
+  tar --extract --gzip --file=hedgedoc-"$VERSION".tar.gz
+  rm --verbose hedgedoc-"$VERSION".tar.gz
+  cp --verbose hedgedoc_"$LOCAL_VERSION"/config.json hedgedoc/config.json
+  cd ~/hedgedoc || exit
+  bin/setup
+  echo "You may need to wait a minute until HedgeDoc is up and running."
+  supervisorctl start $APP_NAME
+  echo "If everything works fine you can delete ~/hedgedoc_$USED_VERSION"
+  echo "Please consider that there might be uploaded files in ~/hedgedoc_$LOCAL_VERSION/public/uploads which were not migrated to the new version if you are using the default setting."
+  rm --recursive ~/hedgedoc_"$LOCAL_VERSION"
+}
+
+function yes-no_question
+{
+  local question=$1
+  while true
+  do
+    read -r -p "$question (Y/n) " ANSWER
+    if [ "$ANSWER" = "" ]
+    then ANSWER='Y'
+    fi
+    case $ANSWER in
+      [Yy]* | [Jj]* )
+        return 0 ;;
+      [Nn]* )
+        return 1 ;;
+      * ) echo "Please answer yes or no." ;;
+    esac
+  done
+}
+
+## this is a helper function to compare two versions as a "lower than" operator
+function version_lt
+{
+  test "$(echo "$@" |
+    tr " " "n" |
+    sort --version-sort --reverse |
+    head --lines=1)" != "$1"
+}
+
+function main
+{
+  if [ "$LOCAL_VERSION" = "$LATEST_VERSION" ]
+  then echo "Your HedgeDoc is already up to date."
+  elif version_lt "$LOCAL_VERSION" "$LATEST_VERSION"
+  then
+    echo "There is a new Version available of $APP_NAME"
+    echo "The latest Version is $LATEST_VERSION"
+    echo "Your local Version is $LOCAL_VERSION"
+    echo "Upgrades to next major releases are not tested."
+    echo "Please read the release notes."
+    echo "Also check if the upgrade instructions have changed."
+    echo "Your instance might break."
+    if yes-no_question "Do you wish to proceed with the upgrade?"
+    then do_upgrade
+    fi
+  fi
+}
+
+main "$@"
+exit $?