Slides used in pyconau 2011 talk on zc.buildout talk.

1. Buildout How to maintain big app stacks without losing your mind Dylan Jay Sypy.org

3. “It should be possible to check-in a buildout specification and reproduce the same software”

4. What problem does it solve?

5. Isolating Python Libraries Like virtualenv

7. Compiling/Building stuff Bit like Make or Ant

8. Installing/Configuring/Deploying Bit like Chef or Puppet

9. Checkout Development Code Bit like svn externals

10. Simplifying Config Templates Bit like Paster Script

12. So what is buildout? Gaffer tape is like the force. It has a light side, a dark side, and it holds the universe together.

14. Perl, Munin

15. Pyramid, Gevent, pyramid_socketio, Redis

16. Django, customapp1, customapp2, customapp3

17. Etc etc

18. Anatomy of a Buildout buildout.cfg: [buildout] parts = MyPart [MyPart] recipe = recipepackage arg1 = value1

19. Initialising $ easy_install zc.buildout … Finished processing dependencies for zc.buildout $ buildout init Creating directory '/Users/dylanjay/Projects/sandpit/buildout/bin'. Creating directory '/Users/dylanjay/Projects/sandpit/buildout/parts'. Creating directory '/Users/dylanjay/Projects/sandpit/buildout/develop-eggs'. Generated script '/Users/dylanjay/Projects/sandpit/buildout/bin/buildout'. $ bin/buildout

20. “What goes on in buildout, stays in buildout”

21. Hello World [buildout] parts = helloworld chmod [helloworld] recipe = collective.recipe.template output = ${buildout:bin-directory}/hello input = inline: echo 'hello world' [chmod] recipe = plone.recipe.command command = chmod +x ${helloworld:output}

22. Dependencies and Substitutions [ buildout] parts = chmod [ helloworld] recipe = collective.recipe.template output = ${buildout:bin-directory}/hello input = inline: echo 'hello world' [ chmod] recipe = plone.recipe.command command = chmod +x ${helloworld:output}

23. Installing Packages (easy_install) [buildout] parts = helloworld [helloworld] recipe = zc.recipe.egg eggs = Fabulous Pillow Interpreter = python $ bin/python -m fabulous.text hello world

24. Installing Scripts [ buildout] parts = helloworld [ helloworld] recipe = zc.recipe.egg eggs = fabulous Pillow # if package has its own entry-point, you don't need the stuff below initialization = from fabulous import text; print text.Text("Hello World", shadow=True) go = lambda: True scripts = hello entry-points = hello=__main__:go

25. Inside bin/script (not rocket science) #!/Users/dylanjay/Projects/virtual/buildout/bin/python import sys sys.path[0:0] = [ '/../download-cache/eggs/elementtree-1.2.7_20070827_preview-py2.4.egg', '/../download-cache/eggs/archetypes.kss-1.4.3-py2.4.egg', … ] import plone.recipe.zope2instance.ctl if __name__ == '__main__': plone.recipe.zope2instance.ctl.main( ["-C", '/Users/dylanjay/Projects/gcio/parts/instance/etc/zope.conf'] + sys.argv[1:])

26. Inside Recipes class HelloRecipe(object): def __init__(self, buildout, name, options): self.input = options.get('input','world') self.output = options['output'] = 'hello %s' % self.input self.location = options['location'] = self.buildout['buildout']['bin-directory']+'hello' def install(self): # Return files that were created by the recipe. The buildout # will remove all returned files upon reinstall. f = open(self.location).write(self.output) ; f.close() return [self.location] def update(self): pass

27. mr.developer [buildout] parts = helloworld extensions = mr.developer auto-checkout= helloworld [sources] helloworld = git git://github.com/topher200/genetic-hello-world-python.git [ helloworld] recipe=zc.recipe.egg eggs = genetic-hello-world-python # WARNING: this example doesn't work

28. zc.recipe.cmmi [buildout] parts = instance varnish [instance] recipe = plone.recipe.zope2instance eggs = Plone HelloWorldPlone Http-address = 127.0.0.1:8080 [varnish-build] recipe = zc.recipe.cmmi url = http://downloads.sourceforge.net/varnish/varnish-2.1.3.tar.gz [varnish] recipe = plone.recipe.varnish daemon = ${varnish-build:location}/sbin/varnishd bind = 127.0.0.1:8080 backends = ${instance:http-address}

29. Versions [ buildout] parts = instance varnish [ instance] recipe = plone.recipe.zope2instance eggs = Plone >= 4.1

30. Versions Pinning [ buildout] parts = instance [ instance] recipe = plone.recipe.zope2instance eggs = Plone [ versions] Plone= 4.1

31. Versions KGS [ buildout] extends = http://dist.plone.org/release/4.1/versions.cfg parts = instance varnish [ instance] recipe = plone.recipe.zope2instance eggs = Plone

32. Version Conflicts Installing. Getting section zeoserver. Initializing part zeoserver. Error: There is a version conflict. We already have: zope.component 3.8.0 but five.localsitemanager 1.1 requires 'zope.component<3.6dev'. Conflicts are caused by buildout having no way to know depenency specs until its too late.

33. Version Conflict Prevention $ bin/buildout -N (prevent auto upgrading packages) $ bin/buidout -v (discover where conflict arose) Or Pinning versions

34. dumppickedversions [buildout] extensions = buildout.dumppickedversions $ bin/buildout Getting distribution for 'buildout.dumppickedversions'. ... *************** PICKED VERSIONS **************** [versions] myegg = 1.1 setuptools = 2.1 zc.buildout = 1.5.3 zc.recipe.egg = 1.5.2 <BLANKLINE> *************** /PICKED VERSIONS ***************

35. Saving versions [ buildout] extensions = buildout.dumppickedversions dump-picked-versions-file = picked.cfg

36. Macros [ buildout] parts = instance varnish [ instance] recipe = plone.recipe.zope2instance eggs = Plone HelloWorldPlone http-address = 127.0.0.1:8080 [instance2] <=instance1 http-address = 127.0.0.1:8081 [ instance2] <= instance1 http-address = 127.0.0.1:8081 [ varnish-build] recipe = zc.recipe.cmmi url = http://downloads.sourceforge.net/varnish/varnish-2.1.3.tar.gz [ varnish] recipe = plone.recipe.varnish daemon = ${varnish-build:location}/sbin/varnishd bind = 127.0.0.1:80 backends = ${ instance:http-address} ${ instance1:http-address} ${ instance2:http-address}

37. mr.scripty [ ports_base] Instance1 = 80 Instance2 = 81 Instance3 = 83 [ ports] recipe=mr.scripty OFFSET = 1000 init= ... for key,value in self.buildout['ports_base'].items(): ... self.options[key] = str(int(value)+int(self.OFFSET))

38. mr.scripty [ buildout] parts = instance varnish [ instance] recipe = plone.recipe.zope2instance eggs = Plone HelloWorldPlone http-address = ${ports:instance1} [ instance2] <= instance1 http-address = ${ports:instance2} [ instance2] <= instance1 http-address = ${ports:instance3}

39. Extending #staging.cfg [buildout] extends = buildout.cfg [ports] OFFSET=8000

40. Annotation mode $ bin/buildout annotate Annotated sections ================== [bfg] dependent-scripts= true /Users/dylanjay/Projects/sandpit/mobme/buildout.cfg eggs= repoze.bfg mobme /Users/dylanjay/Projects/sandpit/mobme/buildout.cfg index= http://dist.repoze.org/bfg/current/simple /Users/dylanjay/Projects/sandpit/mobme/buildout.cfg recipe= zc.recipe.egg /Users/dylanjay/Projects/sandpit/mobme/buildout.cfg [buildout] accept-buildout-test-releases= false DEFAULT_VALUE

41. Other Recipes

43. Uses Fabric under the hood

45. http://pypi.python.org/pypi?%3Aaction=search&term=recipe

46. Dylan Jay

47. Twitter: djay75

48. http://www.pretaweb.com