mesos git commit: Added `support/jenkins/cat.py` to control standard output in Jenkins.

[mp...@apache.org]

Repository: mesos
Updated Branches:
  refs/heads/master 52593a47e -> 329fe968e


Added `support/jenkins/cat.py` to control standard output in Jenkins.


Project: http://git-wip-us.apache.org/repos/asf/mesos/repo
Commit: http://git-wip-us.apache.org/repos/asf/mesos/commit/329fe968
Tree: http://git-wip-us.apache.org/repos/asf/mesos/tree/329fe968
Diff: http://git-wip-us.apache.org/repos/asf/mesos/diff/329fe968

Branch: refs/heads/master
Commit: 329fe968e6dab216bfc42ef84acd37a78f40d9bf
Parents: 52593a4
Author: Michael Park <mp...@apache.org>
Authored: Wed Jan 31 20:47:51 2018 -0800
Committer: Michael Park <mp...@apache.org>
Committed: Thu Feb 1 00:30:37 2018 -0800

----------------------------------------------------------------------
 support/jenkins/cat.py | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
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http://git-wip-us.apache.org/repos/asf/mesos/blob/329fe968/support/jenkins/cat.py
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diff --git a/support/jenkins/cat.py b/support/jenkins/cat.py
new file mode 100755
index 0000000..5ef7414
--- /dev/null
+++ b/support/jenkins/cat.py
@@ -0,0 +1,39 @@
+#!/usr/bin/env python
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+In the Apache Jenkins setup, the standard output and error file descriptors
+are marked as non-blocking. As most programs do not correctly handle
+`EAGAIN`, we pipe Jenkins scripts through this instead.
+
+Example: ./support/jenkins/buildbot.sh | ./support/jenkins/cat.py
+"""
+
+import fcntl
+import os
+import sys
+
+flags = fcntl.fcntl(sys.stdout, fcntl.F_GETFL)
+fcntl.fcntl(sys.stdout, fcntl.F_SETFL, flags&~os.O_NONBLOCK)
+
+while True:
+    data = os.read(sys.stdin.fileno(), 1024)
+    if not data:
+        break
+
+    os.write(sys.stdout.fileno(), data)