Home / server / Questions / 563071
In Process
Richard Knop
Asked: 2013-12-23 15:55:59 +0800 CST

Puppet Init VirtualEnv Just Once

  • 772

So here's a snippet from my manifest (based on this module: https://github.com/stankevich/puppet-python):

python::virtualenv { $virtualenv_dir:
ensure => present,
version => 'system',
systempkgs => false,
distribute => false,
owner => $user,
group => $group,
}

That works fine when I run puppet apply for the first time. Second time it fails though:

Already using interpreter /usr/bin/python
Traceback (most recent call last):
File "/usr/bin/virtualenv", line 3, in 
virtualenv.main()
File "/usr/lib/python2.7/dist-packages/virtualenv.py", line 938, in main
never_download=options.never_download)
File "/usr/lib/python2.7/dist-packages/virtualenv.py", line 1039, in create_environment
site_packages=site_packages, clear=clear))
File "/usr/lib/python2.7/dist-packages/virtualenv.py", line 1274, in install_python
shutil.copyfile(executable, py_executable)
File "/usr/lib/python2.7/shutil.py", line 83, in copyfile
with open(dst, 'wb') as fdst:
IOError: [Errno 26] Text file busy: '/usr/local/myapp/venv/bin/python'

This is probably because I have a bunch of background processes running that using the Python binary from virtualenv (Celery workers, uwsgi workers etc).

Is there a way to only init the virtualenv first time? There is no need to run virtualenv command once the directory is created, right?

puppet

1 Answers

  1. The following class will create a virtual env. "creates" limits the command to only be run if the virtualenv doesn't exist

    class virtualenv ( $virtualenv_dir ) {
  package{'python-virtualenv':
    ensure => installed,
  }

  exec{'create_virtualenv':
    creates => $virtualenv_dir,
    command => "virtualenv $virtualen_dir",
    require => Package['python-virtualenv'],
  } 
}

    Call the class with the following:

    class {'virtualenv':
  virtualenv_dir => '/path/to/virtualenv',
}
    • 0