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ZC Buildout recipe for zdaemon scripts

Project description

The zdaemon recipe provides support for generating zdaemon-based run scripts.

Releases

1.0.0 (unreleased)

  • Python 3 support.

0.3.1 (2013-04-01)

  • Add MANIFEST.in, necessary with the move to git.

0.3 (2013-04-01)

  • Added shell-script setting. When true, shell scripts that refer to a zdaemon script in the software installation are generated instead of Python scripts in the rc directory.

0.2 (2008-09-10)

  • Added support for the deployment recipe name option.

0.1 (2008-05-01)

Initial release.

Detailed Documentation

zdaemon recipe

zc.zdaemonrecipe provides a recipe that can be used to create zdaemon run-control scripts. It can be used directly in buildouts and by other recipes.

It accepts 2 options:

program
The anme of the program and, optionally, command-line arguments. (Note that, due to limitations in zdaemon, the command-line options cannot have embedded spaces.)
zdaemon.conf
Optionally, you can provide extra configuration in ZConfig format. What’s provided will be augmented by the zdaemon recipe, as needed.
deployment

The name of a zc.recipe.deployment deployment. If specified, then:

  • The configuration, log, and run-time files will be put in deployment-defined directories.
  • A logrotate configuration will be generated for the zdaemon transacript log.

Let’s look at an example:

>>> write('buildout.cfg',
... '''
... [buildout]
... parts = run
...
... [run]
... recipe = zc.zdaemonrecipe
... program = sleep 1
... ''')

If we run the buildout, we’ll get a run part that contains the zdaemon configuration file and a run script in the bin directory:

>>> from six import print_
>>> print_(system(buildout), end='')
Installing run.
Generated script '/sample-buildout/bin/zdaemon'.
Generated script '/sample-buildout/bin/run'.
>>> cat('parts', 'run', 'zdaemon.conf')
<runner>
  daemon on
  directory /sample-buildout/parts/run
  program sleep 1
  socket-name /sample-buildout/parts/run/zdaemon.sock
  transcript /sample-buildout/parts/run/transcript.log
</runner>
<BLANKLINE>
<eventlog>
  <logfile>
    path /sample-buildout/parts/run/transcript.log
  </logfile>
</eventlog>
>>> cat('bin', 'run') # doctest: +NORMALIZE_WHITESPACE +ELLIPSIS
#!/usr/local/bin/python2.4
<BLANKLINE>
import sys
sys.path[0:0] = [
  ...
  '/sample-buildout/eggs/zdaemon-2.0-py2.4.egg',
  '/sample-buildout/eggs/ZConfig-2.4-py2.4.egg',
  ]
<BLANKLINE>
import zdaemon.zdctl
<BLANKLINE>
if __name__ == '__main__':
    sys.exit(zdaemon.zdctl.main([
        '-C', '/sample-buildout/parts/run/zdaemon.conf',
        ]+sys.argv[1:]
        ))

zdaemon will also be installed:

>>> ls('eggs')
d  ZConfig-2.4-py2.4.egg
d  setuptools-0.6-py2.4.egg
d  zc.buildout-1.0.0b27-py2.4.egg
d  zc.recipe.egg-1.0.0-py2.4.egg
d  zdaemon-2.0-py2.4.egg
d  zope.testing-3.4-py2.4.egg

You can use an eggs option to specify a zdaemon version.

If we specify a deployment, then the files will be placed in deployment-defined locations:

>>> mkdir('etc')
>>> mkdir('init.d')
>>> mkdir('logrotate')
>>> write('buildout.cfg',
... '''
... [buildout]
... parts = run
...
... [run]
... recipe = zc.zdaemonrecipe
... program = sleep 1
... deployment = deploy
...
... [deploy]
... name = test-deploy
... etc-directory = etc
... rc-directory = init.d
... log-directory = logs
... run-directory = run
... logrotate-directory = logrotate
... user = bob
... ''')
>>> print_(system(buildout), end='')
Uninstalling run.
Installing run.
Generated script '/sample-buildout/init.d/test-deploy-run'.
>>> import os
>>> os.path.exists('parts/run')
False
>>> os.path.exists('bin/run')
False
>>> cat('etc', 'run-zdaemon.conf')
<runner>
  daemon on
  directory run
  program sleep 1
  socket-name run/run-zdaemon.sock
  transcript logs/run.log
  user bob
</runner>
<BLANKLINE>
<eventlog>
  <logfile>
    path logs/run.log
  </logfile>
</eventlog>
>>> cat('init.d', 'test-deploy-run') # doctest: +NORMALIZE_WHITESPACE +ELLIPSIS
#!/usr/local/bin/python2.4
<BLANKLINE>
import sys
sys.path[0:0] = [
  ...
  '/sample-buildout/eggs/zdaemon-2.0a6-py2.4.egg',
  '/sample-buildout/eggs/ZConfig-2.4a6-py2.4.egg',
  ]
<BLANKLINE>
import zdaemon.zdctl
<BLANKLINE>
if __name__ == '__main__':
    sys.exit(zdaemon.zdctl.main([
        '-C', 'etc/run-zdaemon.conf',
        ]+sys.argv[1:]
        ))
>>> cat('logrotate', 'test-deploy-run')
logs/run.log {
  rotate 5
  weekly
  postrotate
    init.d/test-deploy-run -C etc/run-zdaemon.conf reopen_transcript
  endscript
}

If you want to override any part of the generated zdaemon configuration, simply provide a zdaemon.conf option in your instance section:

>>> write('buildout.cfg',
... '''
... [buildout]
... parts = run
...
... [run]
... recipe = zc.zdaemonrecipe
... program = sleep 1
... deployment = deploy
... zdaemon.conf =
...     <runner>
...       daemon off
...       socket-name /sample-buildout/parts/instance/sock
...       transcript /dev/null
...     </runner>
...     <eventlog>
...     </eventlog>
...
... [deploy]
... etc-directory = etc
... rc-directory = init.d
... log-directory = logs
... run-directory = run
... logrotate-directory = logrotate
... user = bob
... ''')
>>> print_(system(buildout), end='')
Uninstalling run.
Installing run.
Generated script '/sample-buildout/init.d/deploy-run'.
>>> cat('etc', 'run-zdaemon.conf')
<runner>
  daemon off
  directory run
  program sleep 1
  socket-name /sample-buildout/parts/instance/sock
  transcript /dev/null
  user bob
</runner>
<BLANKLINE>
<eventlog>
</eventlog>

Creating shell start scripts

By default, the startup scripts are generated Python scripts that use the zdaemon module. Sometimes, this is inconvenient. In particular, when deploying software, generated Python scripts may break after a software update because they contain paths to software eggs. We can request shell scripts that invoke a generic zdaemon script. The shell script only depends on the path to the zdaemon script, which generally doesn’t change when updating softawre.

To request a shell script, add a shell-script option with a true value:

>>> write('buildout.cfg',
... '''
... [buildout]
... parts = run
...
... [run]
... recipe = zc.zdaemonrecipe
... program = sleep 1
... shell-script = true
... deployment = deploy
...
... [deploy]
... name = test-deploy
... etc-directory = etc
... rc-directory = init.d
... log-directory = logs
... run-directory = run
... logrotate-directory = logrotate
... user = alice
... ''')
>>> print_(system(buildout), end='')  # doctest: +NORMALIZE_WHITESPACE
Uninstalling run.
Installing run.
zc.zdaemonrecipe: Generated shell script
    '/sample-buildout/init.d/test-deploy-run'.
>>> cat('init.d', 'test-deploy-run')  # doctest: +NORMALIZE_WHITESPACE
#!/bin/sh
su alice -c \
    "/sample-buildout/bin/zdaemon
         -C '/sample-buildout/etc/run-zdaemon.conf' $*"
>>> ls('etc')
-  run-zdaemon.conf

Using the zdaemon recipe from other recipes

To use the daemon recipe from other recipes, simply instantiate an instance in your recipe __init__, passing your __init__ arguments, and then calling the instance’s install in your install method.

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