Added pip3_plugin

bootstrapvz/plugins/pip3_install/README.rst

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+Pip3 install
+------------
+
+Install packages from the Python Package Index via pip for python3
+
+Installs ``build-essential`` and ``python3-dev`` debian packages, so
+Python extension modules can be built.
+
+Settings
+~~~~~~~~
+
+-  ``packages``: Python packages to install, a list of strings. The list
+   can contain anything that ``pip install`` would accept as an
+   argument, for example ``awscli==1.3.13``.

bootstrapvz/plugins/pip3_install/__init__.py

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+from . import tasks
+
+
+def validate_manifest(data, validator, error):
+    from bootstrapvz.common.tools import rel_path
+    validator(data, rel_path(__file__, 'manifest-schema.yml'))
+
+
+def resolve_tasks(taskset, manifest):
+    taskset.add(tasks.AddPip3Package)
+    taskset.add(tasks.Pip3InstallCommand)

bootstrapvz/plugins/pip3_install/manifest-schema.yml

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+---
+$schema: http://json-schema.org/draft-04/schema#
+title: Pip3 install plugin manifest
+type: object
+properties:
+  plugins:
+    type: object
+    properties:
+      pip_install:
+        type: object
+        properties:
+          packages:
+            type: array
+            items:
+              type: string
+            minItems: 1
+            uniqueItems: true
+        additionalProperties: false

bootstrapvz/plugins/pip3_install/tasks.py

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+from bootstrapvz.base import Task
+from bootstrapvz.common import phases
+
+
+class AddPip3Package(Task):
+    description = 'Adding `pip\' and Co. to the image packages'
+    phase = phases.preparation
+
+    @classmethod
+    def run(cls, info):
+        for package_name in ('build-essential', 'python3-dev', 'python3-pip'):
+            info.packages.add(package_name)
+
+
+class Pip3InstallCommand(Task):
+    description = 'Install python packages from pypi with pip'
+    phase = phases.system_modification
+
+    @classmethod
+    def run(cls, info):
+        from bootstrapvz.common.tools import log_check_call
+        packages = info.manifest.plugins['pip3_install']['packages']
+        pip_install_command = ['chroot', info.root, 'pip3', 'install']
+        pip_install_command.extend(packages)
+        log_check_call(pip_install_command)