2 files changed, 42 insertions, 0 deletions
diff --git a/app/scripts/migrations/005.js b/app/scripts/migrations/005.js
new file mode 100644
index 000000000..65f62a861
--- /dev/null
+++ b/app/scripts/migrations/005.js
@@ -0,0 +1,41 @@
+const version = 5
+
+/*
+
+This migration moves state from the flat state trie into KeyringController substate
+
+*/
+
+const extend = require('xtend')
+
+module.exports = {
+  version,  
+
+  migrate: function (versionedData) {
+    versionedData.meta.version = version
+    try {
+      const state = versionedData.data
+      const newState = selectSubstateForKeyringController(state)
+      versionedData.data = newState
+    } catch (err) {
+      console.warn('MetaMask Migration #5' + err.stack)
+    }
+    return Promise.resolve(versionedData)
+  },
+}
+
+function selectSubstateForKeyringController (state) {
+  const config = state.config
+  const newState = extend(state, {
+    KeyringController: {
+      vault: state.vault,
+      selectedAccount: config.selectedAccount,
+      walletNicknames: state.walletNicknames,
+    },
+  })
+  delete newState.vault
+  delete newState.walletNicknames
+  delete newState.config.selectedAccount
+
+  return newState
+}
diff --git a/app/scripts/migrations/index.js b/app/scripts/migrations/index.js
index d2ac221b9..a7ce745e7 100644
--- a/app/scripts/migrations/index.js
+++ b/app/scripts/migrations/index.js
@@ -15,4 +15,5 @@ module.exports = [
   require('./002'),
   require('./003'),
   require('./004'),
+  require('./005'),
 ]