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slapos.recipe.template
Commit 62f55c69 authored by Julien Muchembled's avatar Julien Muchembled
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README.txt
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slapos.recipe.template
======================
Template recipe which supports remote resource.
.. contents::
Inspired by collective.recipe.template, with minimum set of features, but with
(hopefully) safer buildout-based templating.
Collection of recipes to generate a file from a template that can be
either inline or fetched with the buildout download API.
"jinja2" entry point allows rendering jinja2 templates.
Inspired by `collective.recipe.template`.
slapos/recipe/template/README.jinja2.txt
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slapos/recipe/template/README.txt
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Usage
=====
--------------
default recipe
--------------
Getting started
---------------
The default recipe generates a file (option ``output``) from a template using
buildout expansion. The template is specified with either ``url`` (optionally
combined with ``md5sum``) or ``inline``.
You can start by a simple buildout::
Here is a simple buildout::
>>> write('buildout.cfg',
... '''
>>> base = """
... [buildout]
... parts = template
...
... [section]
... option = value
...
... [template]
... recipe = slapos.recipe.template
... url = template.in
... output = template.out
...
... [section]
... option = value
... ''')
... """
>>> write('buildout.cfg', base)
And a simple template::
A simple template::
>>> write('template.in', '${section:option}')
We run buildout::
And the output file has been parsed by buildout itself::
>>> run_buildout()
Installing template.
And the output file has been parsed by buildout itself::
>>> cat('template.out')
value
Full options
------------
There is two non required options:
``md5sum``
Check the integrity of the input file.
The recipe relies on buildout expansion to pull sections it depends on, which
implies that the rendering (including the download if requested) is done during
the initialization phase.
``mode``
Specify the filesystem permissions in octal notation.
Options
-------
Check file integrity
~~~~~~~~~~~~~~~~~~~~
``md5sum`` - check file integrity
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Let's write a file template::
>>> write('template.in', '${buildout:parts}')
Compute its MD5 sum::
>>> from hashlib import md5
>>> with open('template.in', 'rb') as f:
... md5sum = md5(f.read()).hexdigest()
Write the ``buildout.cfg`` using slapos.recipe.template::
>>> write('buildout.cfg',
... '''
... [buildout]
... parts = template
...
... [template]
... recipe = slapos.recipe.template
... url = template.in
... output = template.out
... md5sum = ''' + md5sum + '''
... ''')
And run buildout, and see the result::
If the template is specified with the ``url`` option, an MD5 checksum can be
given to check the contents of the template::
>>> base += """
... md5sum = 1993226f57db37c4a19cb785f826a1aa
... """
>>> write(sample_buildout, 'buildout.cfg', base)
>>> run_buildout()
Uninstalling template.
Installing template.
>>> cat('template.out')
template
value
If the md5sum doesn't match, the buildout fail::
In such case, updating the part does nothing::
>>> write('buildout.cfg',
... '''
... [buildout]
... parts = template
...
... [template]
... recipe = slapos.recipe.template
... url = template.in
... output = template.out
... md5sum = 0123456789abcdef0123456789abcdef
... ''')
>>> write('template.out', 'altered')
>>> run_buildout()
Updating template.
>>> cat('template.out')
altered
In case of checksum mismatch::
>>> run_buildout('template:md5sum=00000000000000000000000000000000')
While:
Installing.
Getting section template.
Initializing section template.
Error: MD5 checksum mismatch for local resource at 'template.in'.
``inline``
~~~~~~~~~~
Specify filesystem permissions
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
You may prefer to inline small templates::
You can specify the mode of the written file::
>>> write('template.in', '${buildout:installed}')
>>> write('buildout.cfg',
... '''
>>> write('buildout.cfg', """
... [buildout]
... parts = template
...
... [template]
... recipe = slapos.recipe.template
... url = template.in
... output = template.out
... mode = 0627
... ''')
>>> run_buildout()
Uninstalling template.
Installing template.
And the generated file with have the right permissions::
>>> import os, stat
>>> print("0%o" % stat.S_IMODE(os.stat('template.out').st_mode))
0627
Fetching template source from an URL
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
You can fetch resources from an URL::
>>> server_data = tmpdir('server_data')
>>> server_url = start_server(server_data)
>>> write(server_data, 'template.in', '${buildout:parts}')
>>> write('buildout.cfg', '''
... [buildout]
... parts = template
... [section]
... option = inlined
...
... [template]
... recipe = slapos.recipe.template
... url = %stemplate.in
... md5sum = %s
... inline = ${section:option}
... output = template.out
...
... ''' % (server_url, md5sum))
... """)
>>> run_buildout()
Downloading http://localhost/template.in
Cannot download http://localhost/template.in from network cache.
Uninstalling template.
Installing template.
>>> cat('template.out')
template
inlined
Section dependency
------------------
Note that in such case, the rendering is done by buildout itself:
it just creates a file with the value of ``inline``.
You can use other part of buildout in the template. This way this parts
will be installed as dependency::
``mode`` - specify filesystem permissions
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>> write('template.in', '${dependency:foobar}')
>>> write('buildout.cfg', '''
... [buildout]
... parts = template
...
... [template]
... recipe = slapos.recipe.template
... url = template.in
... output = template.out
...
... [dependency]
... foobar = dependency content
... recipe = zc.buildout:debug
... ''')
By default, executable permissions are set if the content of the output file
looks like an executable script, i.e. it has a shebang that points to an
executable file. This is done by respecting umask::
>>> run_buildout()
>>> import os, stat
>>> os.access('template.out', os.X_OK)
False
>>> run_buildout('section:option=#!/bin/sh')
Uninstalling template.
Installing dependency.
foobar='dependency content'
recipe='zc.buildout:debug'
Installing template.
>>> os.access('template.out', os.X_OK)
True
This way you can get options which are computed in the ``__init__`` of
the dependent recipe.
Let's create a sample recipe modifying its option dict::
>>> write('setup.py',
... '''
... from setuptools import setup
...
... setup(name='samplerecipe',
... entry_points = {
... 'zc.buildout': [
... 'default = main:Recipe',
... ],
... }
... )
... ''')
>>> write('main.py',
... '''
... class Recipe(object):
...
... def __init__(self, buildout, name, options):
... options['data'] = 'foobar'
...
... def install(self):
... return []
... ''')
Let's just use ``buildout.cfg`` using this egg::
File permissions can be forced using the ``mode`` option in octal representation
(no need for 0-prefix)::
>>> write('template.in', '${sample:data}')
>>> write('buildout.cfg',
... '''
... [buildout]
... develop = .
... parts = template
...
... [template]
... recipe = slapos.recipe.template
... url = template.in
... output = template.out
...
... [sample]
... recipe = samplerecipe
... ''')
>>> run_buildout()
Develop: '/sample-buildout/.'
>>> run_buildout('template:mode=627')
Uninstalling template.
Uninstalling dependency.
Installing sample.
Installing template.
>>> cat('template.out')
foobar
>>> print(oct(stat.S_IMODE(os.stat('template.out').st_mode)))
0627
slapos/recipe/template/tests.py
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......@@ -42,7 +42,8 @@ def setUp(test):
testing.buildoutSetUp(test)
testing.install_develop('slapos.recipe.template', test)
(lambda system, buildout, **kw: test.globs.update(
run_buildout = lambda: print(system(buildout), end='')
run_buildout = lambda *args: print(system(' '.join((buildout,) + args)),
end='')
))(**test.globs)
......
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