cln: add the backup plugin + options

Usage options:
cln-plugin.backup.sh [on] [testnet|mainnet|signet]
cln-plugin.backup.sh [restore] [testnet|mainnet|signet] [force]
cln-plugin.backup.sh [backup-compact] [testnet|mainnet|signet]
https://github.com/lightningd/plugins/tree/master/backup

Discussed in: raspiblitz#2295

home.admin/config.scripts/cln-plugin.backup.sh

@@ -0,0 +1,98 @@
+#!/bin/bash
+
+function help(){
+  echo
+  echo "Install the backup plugin for C-lightning"
+  echo "Usage:"
+  echo "cln-plugin.backup.sh [on] [testnet|mainnet|signet]"
+  echo "cln-plugin.backup.sh [restore] [testnet|mainnet|signet] [force]"
+  echo "cln-plugin.backup.sh [backup-compact] [testnet|mainnet|signet]"
+  echo "https://github.com/lightningd/plugins/tree/master/backup"
+  echo
+  exit 1
+}
+
+# command info
+if [ $# -eq 0 ] || [ "$1" = "-h" ] || [ "$1" = "-help" ];then
+  help
+fi
+
+source <(/home/admin/config.scripts/network.aliases.sh getvars cln $2)
+
+plugin="backup"
+plugindir="/home/bitcoin/cln-plugins-available"
+
+function install() {
+  if [ ! -f "/home/bitcoin/cln-plugins-available/plugins/${plugin}/${plugin}.py" ]; then
+    cd /home/bitcoin/cln-plugins-available || exit 1
+    sudo -u bitcoin git clone https://github.com/lightningd/plugins.git
+  fi
+
+  if [ $($lightningcli_alias plugin list | grep "${plugin}") -eq 0 ];then
+    echo "# Starting the ${plugin} plugin"
+    sudo -u bitcoin pip install --user -r ${plugindir}/${plugin}/requirements.txt
+    sudo chmod +x ${plugindir}/${plugin}/${plugin}.py
+    # symlink to the default plugin dir
+    if [ ! -L /home/bitcoin/cln-plugins-enabled/backup ];then
+      sudo ln -s /home/bitcoin/cln-plugins-available/plugins/backup /home/bitcoin/cln-plugins-enabled/
+    fi
+  fi
+}
+
+if [ $1 = on ];then
+
+  install
+
+  # initialize
+  if [ ! -f /home/bitcoin/.lightning/${CLNETWORK}/backup.lock ];then
+  # https://github.com/lightningd/plugins/tree/master/backup#setup
+  /home/bitcoin/cln-plugins-enabled/backup/backup-cli init\
+    --lightning-dir /home/bitcoin/.lightning/${CLNETWORK} \
+    file:///home/bitcoin/${netprefix}lightningd.sqlite3.backup
+  fi
+
+
+elif [ $1 = restore ];then
+
+  install
+
+  #look for a backup to restore
+  if [ -f /home/bitcoin/${netprefix}lightningd.sqlite3.backup ];then
+
+    sudo systemctl stop ${netprefix}lightningd
+
+    # https://github.com/lightningd/plugins/tree/master/backup#restoring-a-backup
+    # ./backup-cli restore file:///mnt/external/location ~/.lightning/bitcoin/lightningd.sqlite3
+
+    # make sure to not overwrite old database
+    if [ -f /home/bitcoin/.lightning/${CLNETWORK}/lightningd.sqlite3 ];then
+      now=$(date +"%Y_%m_%d_%H%M%S")
+      sudo cp /home/bitcoin/.lightning/${CLNETWORK}/lightningd.sqlite3.backup.${now} || exit 1
+      if [ "$(echo "$@" | grep -c "force")" -gt 0 ];then
+        sudo rm /home/bitcoin/.lightning/${CLNETWORK}/lightningd.sqlite3
+      fi
+    fi
+
+    # restore
+    /home/bitcoin/cln-plugins-enabled/backup/backup-cli restore \
+      file:///home/bitcoin/${netprefix}lightningd.sqlite3.backup \
+      /home/bitcoin/.lightning/${CLNETWORK}/lightningd.sqlite3
+
+    sudo systemctl start ${netprefix}lightningd
+  fi
+
+elif  [ $1 = backup-compact ];then
+
+  if [ -f /home/bitcoin/.lightning/${CLNETWORK}/lightningd.sqlite3 ];then
+    # https://github.com/lightningd/plugins/tree/master/backup#performing-backup-compaction
+    echo "#  Running $lightning-cli backup-compact ..."
+    $lightning-cli backup-compact
+
+  else
+    echo "# No /home/bitcoin/.lightning/${CLNETWORK}/lightningd.sqlite3 present"
+    echo "# Run 'config.scripts/cln-plugin.backup.sh on ${CLNETWORK}' first"    
+  fi
+
+else
+  help
+fi