From 7bdabb5cbc3853090b3b133587e820e48495b75d Mon Sep 17 00:00:00 2001
From: ansuz <ansuz@transitiontech.ca>
Date: Tue, 6 Jul 2021 15:42:37 +0530
Subject: [PATCH] archive blocks before overwriting them

---
 lib/storage/block.js | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/lib/storage/block.js b/lib/storage/block.js
index d3e7a1869..1078f6d2e 100644
--- a/lib/storage/block.js
+++ b/lib/storage/block.js
@@ -72,9 +72,16 @@ Block.write = function (Env, publicKey, buffer, _cb) {
             w.abort();
             cb(err);
         }));
+    }).nThen(function (w) {
+        Block.archive(Env, publicKey, w(function (/* err */) {
+    /*
+        we proceed even if there are errors.
+        it might be ENOENT (there is no file to archive)
+        or EACCES (bad filesystem permissions for the existing archived block?)
+        or lots of other things, none of which justify preventing the write
+    */
+        }));
     }).nThen(function () {
-        // XXX BLOCK check whether this overwrites a block
-        // XXX archive the old one if so
         Fs.writeFile(path, buffer, { encoding: 'binary' }, cb);
     });
 };