From 67d1e2acd8caeb0956b97982123f01f64cfdc52a Mon Sep 17 00:00:00 2001
From: Dave C-J <dave@conway-jones.co.uk>
Date: Tue, 6 May 2014 15:22:37 +0100
Subject: [PATCH] Create a copy of the previous flow file (flow.previous)
 before each deploy closes #184 In case of emergency you can now find the
 previous flow file before you hit deploy in a file called flow.previous . As
 indicated it is the flow that was running prior to you hitting deploy...

---
 .gitignore                     | 1 +
 red/storage/localfilesystem.js | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/.gitignore b/.gitignore
index 853218a39..b23124927 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 node_modules
 credentials.json
 flows*.json
+flow.backup
 *_cred*
 nodes/node-red-nodes/
 .npm
diff --git a/red/storage/localfilesystem.js b/red/storage/localfilesystem.js
index e7832a936..5dc191768 100644
--- a/red/storage/localfilesystem.js
+++ b/red/storage/localfilesystem.js
@@ -27,6 +27,7 @@ var promiseDir = nodeFn.lift(mkdirp);
 var settings;
 var flowsFile;
 var flowsFullPath;
+var flowsPrev;
 var credentialsFile;
 var oldCredentialsFile;
 var userDir;
@@ -152,6 +153,7 @@ var localfilesystem = {
         var fsext = fspath.extname(flowsFile);
         credentialsFile = fspath.join(userDir,fspath.basename(flowsFile,fsext)+"_cred"+fsext);
         oldCredentialsFile = fspath.join(userDir,"credentials.json");
+        flowsPrev = fspath.join(userDir,"flow.backup");
 
         libDir = fspath.join(userDir,"lib");
         libFlowsDir = fspath.join(libDir,"flows");
@@ -176,6 +178,7 @@ var localfilesystem = {
     },
 
     saveFlows: function(flows) {
+        fs.rename(flowsFullPath,flowsPrev);
         return nodeFn.call(fs.writeFile, flowsFullPath, JSON.stringify(flows));
     },