Restore from ELECTRUM_MASTER_PRIVATE_KEY or ELECTRUM_MASTER_PUBLIC_KEY

README.md

@@ -69,6 +69,10 @@ curl --data-binary '{"id":"1","method":"listaddresses"}' http://electrum:electru
 
 Always link electrum daemon to containers or bind to localhost directly and not expose 7000 port for security reasons.
 
+### 12 Factor
+
+You may also restore the wallet from a Master Private Key or Master Public Key by setting `ELECTRUM_MASTER_PRIVATE_KEY` or `ELECTRUM_MASTER_PUBLIC_KEY` env vars. This is useful in a setup like Kubernetes. If a wallet already exists, the master private key or the master public key will not be restored.
+
 ## API
 
 * [Electrum protocol specs](http://docs.electrum.org/en/latest/protocol.html)

docker-compose.yml

@@ -7,3 +7,5 @@ services:
     environment:
       ELECTRUM_USER: electrum
       ELECTRUM_PASSWORD: changeme
+      ELECTRUM_MASTER_PRIVATE_KEY: xprv9s21ZrQH143K2qhNXjGPHr6Rdz3h2N5dnt4sFspFnDqP8rPCXi5YPHq6hqQ2jSJb6XM4qwbfwMqxP5qsFRFRBKMPnE3WiAhFsBkVcMv2rYX
+      ELECTRUM_MASTER_PUBLIC_KEY: xpub661MyMwAqRbcFKmqdkoPez3AC1tBRpoVA6zU4GDsLZNN1eiM5FPnw69aZ6NbpahyLMsKeyjf2eqS64xSqYfsj9YWFWUpKtzbXmkLiAsRyCF

docker-entrypoint.sh

@@ -15,6 +15,33 @@ electrum setconfig rpcport 7000
 # Run application
 electrum daemon start
 
+echo "checking status"
+electrum daemon status
+echo "Done"
+
+# Restore from keys if available
+if [ -n "$ELECTRUM_MASTER_PRIVATE_KEY" ];
+then
+  echo "Restoring and loading wallet from Master Private Key"
+  {
+    # && - do not stop script if command fails
+    echo | electrum restore $ELECTRUM_MASTER_PRIVATE_KEY
+  } || { # catch
+    echo "Wallet already exists; skipping..."
+  }
+  electrum daemon load_wallet
+elif [ -n "$ELECTRUM_MASTER_PUBLIC_KEY" ];
+then
+  echo "Restoring and loading wallet from Master Public Key"
+  {
+    # && - do not stop script if command fails
+    electrum restore $ELECTRUM_MASTER_PUBLIC_KEY
+  } || {
+    echo "Wallet already exists; skipping..."
+  }
+  electrum daemon load_wallet
+fi
+
 # Wait forever
 while true; do
   tail -f /dev/null & wait ${!}