From bbeeec13cb8816dabd9a71fed954c5ed03d1bfd8 Mon Sep 17 00:00:00 2001
From: Ramon Tayag <ramon@tayag.net>
Date: Sat, 20 Jan 2018 20:43:07 +0800
Subject: [PATCH] Restore from ELECTRUM_MASTER_PRIVATE_KEY or
 ELECTRUM_MASTER_PUBLIC_KEY

---
 README.md            |  3 +++
 docker-compose.yml   |  2 ++
 docker-entrypoint.sh | 13 +++++++++++++
 3 files changed, 18 insertions(+)

diff --git a/README.md b/README.md
index bf4e0f2..635d5a0 100644
--- a/README.md
+++ b/README.md
@@ -76,6 +76,9 @@ 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.
+
 ## API
 
 * [Electrum protocol specs](http://docs.electrum.org/en/latest/protocol.html)
diff --git a/docker-compose.yml b/docker-compose.yml
index 2718354..7cc7f25 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -7,3 +7,5 @@ services:
     environment:
       ELECTRUM_USER: electrum
       ELECTRUM_PASSWORD: electrumz
+      ELECTRUM_MASTER_PRIVATE_KEY: xprv9s21ZrQH143K2qhNXjGPHr6Rdz3h2N5dnt4sFspFnDqP8rPCXi5YPHq6hqQ2jSJb6XM4qwbfwMqxP5qsFRFRBKMPnE3WiAhFsBkVcMv2rYX
+      ELECTRUM_MASTER_PUBLIC_KEY: xpub661MyMwAqRbcFKmqdkoPez3AC1tBRpoVA6zU4GDsLZNN1eiM5FPnw69aZ6NbpahyLMsKeyjf2eqS64xSqYfsj9YWFWUpKtzbXmkLiAsRyCF
diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index f87acb8..432ed3f 100755
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -12,6 +12,19 @@ electrum setconfig rpcport 7000
 # run application
 electrum daemon start
 
+# restore from keys if available
+if [ -n "$ELECTRUM_MASTER_PRIVATE_KEY" ];
+then
+  echo "Restoring and loading wallet from Master Private Key"
+  echo | electrum restore $ELECTRUM_MASTER_PRIVATE_KEY
+  electrum daemon load_wallet
+elif [ -n "$ELECTRUM_MASTER_PUBLIC_KEY" ];
+then
+  echo "Restoring and loading wallet from Master Public Key"
+  electrum restore $ELECTRUM_MASTER_PUBLIC_KEY
+  electrum daemon load_wallet
+fi
+
 # wait forever
 while true; do
   tail -f /dev/null & wait ${!}