Deployment-specific scripts

Many deployments provide scripts that tie the configurations into the software. This is often done to make it easier to work with specific deployments of the software.

The conventional Unix file hierarchy doesn’t really provide a good shared place for such scripts; the zc.recipe.deployment:script recipe generates these scripts in the deployment’s bin-directory, but we’d rather have the resulting scripts associated with the deployment itself.

The options for the recipe are the same as those for the zc.recipe.egg:script recipe, with the addition of a required deployment setting. The etc-directory from the deployment is used instead of the buildout’s bin-directory. This allows deployment-specific information to be embedded in the script via the initialization setting.

Let’s take a look at a simple case. We’ll need a package with a console_script entry point:

>>> write('setup.py', '''\
... from setuptools import setup
... setup(
...     name="testpkg",
...     package_dir={"": "src"},
...     py_modules=["testmodule"],
...     zip_safe=False,
...     entry_points={
...         "console_scripts": [
...             "myscript=testmodule:main",
...             ],
...         },
...     )
... ''')

>>> mkdir('src')
>>> write('src', 'testmodule.py', '''\
... some_setting = "42"
... def main():
...     print some_setting
... ''')

>>> write('buildout.cfg',
... '''
... [buildout]
... develop = .
... parts = somescript
...
... [mydep]
... recipe = zc.recipe.deployment
... prefix = %s
... user = %s
... etc-user = %s
...
... [somescript]
... recipe = zc.recipe.script
... deployment = mydep
... eggs = testpkg
... scripts = myscript
... initialization =
...     import testmodule
...     testmodule.some_setting = "24"
... ''' % (sample_buildout, user, user))

>>> print system(join('bin', 'buildout')), # doctest: +NORMALIZE_WHITESPACE
Develop: 'PREFIX/.'
Installing mydep.
zc.recipe.deployment:
    Creating 'PREFIX/etc/mydep',
    mode 755, user 'USER', group 'GROUP'
zc.recipe.deployment:
    Creating 'PREFIX/var/cache/mydep',
    mode 755, user 'USER', group 'GROUP'
zc.recipe.deployment:
    Creating 'PREFIX/var/lib/mydep',
    mode 755, user 'USER', group 'GROUP'
zc.recipe.deployment:
    Creating 'PREFIX/var/log/mydep',
    mode 755, user 'USER', group 'GROUP'
zc.recipe.deployment:
    Creating 'PREFIX/var/run/mydep',
    mode 750, user 'USER', group 'GROUP'
zc.recipe.deployment:
    Creating 'PREFIX/etc/cron.d',
    mode 755, user 'USER', group 'GROUP'
zc.recipe.deployment:
    Creating 'PREFIX/etc/init.d',
    mode 755, user 'USER', group 'GROUP'
zc.recipe.deployment:
    Creating 'PREFIX/etc/logrotate.d',
    mode 755, user 'USER', group 'GROUP'
Installing somescript.
Generated script 'PREFIX/etc/mydep/myscript'.

>>> print ls("etc/mydep")
drwxr-xr-x USER GROUP etc/mydep

>>> cat("etc/mydep/myscript") # doctest: +NORMALIZE_WHITESPACE
#!/usr/bin/python
<BLANKLINE>
import sys
sys.path[0:0] = [
    'PREFIX/src',
    ]
<BLANKLINE>
import testmodule
testmodule.some_setting = "24"
<BLANKLINE>
import testmodule
<BLANKLINE>
if __name__ == '__main__':
    sys.exit(testmodule.main())