From 51e3a5f0e2af70df05d3a433112db054820c312a Mon Sep 17 00:00:00 2001
From: Richard Larkin <zenkey.zencode@gmail.com>
Date: Fri, 25 Nov 2016 14:25:22 +0200
Subject: [PATCH] Prevent saving of state on corrupt download

references #179
---
 toolchain.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/toolchain.py b/toolchain.py
index 57554c7..487ec42 100755
--- a/toolchain.py
+++ b/toolchain.py
@@ -578,7 +578,8 @@ class Recipe(object):
         value = self.ctx.state.get(key)
         if not value:
             value = self.get_archive_rootdir(self.archive_fn)
-            self.ctx.state[key] = value
+            if value is not None:
+                self.ctx.state[key] = value
         return value
 
     def execute(self):
@@ -614,7 +615,9 @@ class Recipe(object):
             fn = self.archive_fn
             if not exists(fn):
                 self.download_file(self.url.format(version=self.version), fn)
-            self.ctx.state[key] = self.get_archive_rootdir(self.archive_fn)
+            status = self.get_archive_rootdir(self.archive_fn)
+            if status is not None:
+                self.ctx.state[key] = status
 
     @cache_execution
     def extract(self):