purge cache in cloud-init so it doesn't end up persisting across instances

The cache file location is not instance specific.  As such, if it is
not cleaned from the image, a re-bundle would get the old data.  To avoid
that, clear the cache in cloud-init.

2 files changed, 13 insertions, 0 deletions

diff --git a/cloud-init.py b/cloud-init.py
index 1db2ea60..c92f07cd 100755
--- a/cloud-init.py
+++ b/cloud-init.py
@@ -26,6 +26,9 @@ def warn(str):
     sys.stderr.write(str)
 
 def main():
+    # cache is not instance specific, so it has to be purged
+    cloudinit.purge_cache()
+
     cloud = cloudinit.CloudInit()
 
     try:
diff --git a/cloudinit/__init__.py b/cloudinit/__init__.py
index 8d6ec59e..1d8a1898 100644
--- a/cloudinit/__init__.py
+++ b/cloudinit/__init__.py
@@ -318,3 +318,13 @@ class CloudInit:
 
     def device_name_to_device(self,name):
         return(self.datasource.device_name_to_device(name))
+
+
+def purge_cache():
+    try:
+        os.unlink(data_source_cache)
+    except OSError as e:
+        if e.errno != errno.ENOENT: return(False)
+    except:
+        return(False)
+    return(True)