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Introduce a connection locking infrastructure

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The lock file is (a temporary file) opened in the parent process, whose
open fd is inherited by the workers after fork, and passed down through
the PlayContext. Connection grows lock/unlock methods which can be used
by individual connection plugins.
This commit is contained in:
Abhijit Menon-Sen
2015-08-01 09:26:07 +05:30
parent 88d3751c28
commit 5887e96b27
3 changed files with 21 additions and 0 deletions
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10
lib/ansible/plugins/connections/__init__.py
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@@ -155,3 +155,13 @@ class ConnectionBase(with_metaclass(ABCMeta, object)):
if incorrect_password in output:
raise AnsibleError('Incorrect %s password' % self._play_context.become_method)
def lock_connection(self):
f = self._play_context.connection_lockfd
self._display.vvvv('CONNECTION: pid %d waiting for lock on %d' % (os.getpid(), f))
fcntl.lockf(f, fcntl.LOCK_EX)
self._display.vvvv('CONNECTION: pid %d acquired lock on %d' % (os.getpid(), f))
def unlock_connection(self):
f = self._play_context.connection_lockfd
fcntl.lockf(f, fcntl.LOCK_UN)
self._display.vvvv('CONNECTION: pid %d released lock on %d' % (os.getpid(), f))