[Qa-jenkins-scm] [jenkins.debian.net] 01/01: reproducible: write json to tempfile first, so that updates are atomic

[Holger Levsen]

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holger pushed a commit to branch master
in repository jenkins.debian.net.

commit 9e142f8c980a64d13df65789232807d417234c58
Author: Holger Levsen <holger at layer-acht.org>
Date:   Fri Mar 13 18:29:39 2015 +0100

    reproducible: write json to tempfile first, so that updates are atomic
---
 bin/reproducible_json.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/bin/reproducible_json.py b/bin/reproducible_json.py
index 3d63a03..d00d509 100755
--- a/bin/reproducible_json.py
+++ b/bin/reproducible_json.py
@@ -12,6 +12,9 @@
 from reproducible_common import *
 
 import json
+import os
+import tempfile
+
 
 output = []
 
@@ -29,8 +32,12 @@ for row in result:
     log.debug(pkg)
     output.append(pkg)
 
-with open(REPRODUCIBLE_JSON, 'w') as fd:
+tmpfile = tempfile.NamedTemporaryFile(dir=os.path.dirname(REPRODUCIBLE_JSON))
+
+with open(tmpfile.name, 'w') as fd:
     json.dump(output, fd, indent=4, sort_keys=True)
 
+os.rename(tmpfile.name, REPRODUCIBLE_JSON)
+
 log.info(REPRODUCIBLE_URL + '/reproducible.json has been updated.')
 

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