Add brew script to the contrib folder

contrib/brew/.gitignore

@@ -0,0 +1 @@
+*.pyc

contrib/brew/README.md

@@ -0,0 +1,78 @@
+# docker-brew
+
+docker-brew is a command-line tool used to build the docker standard library.
+
+## Install instructions
+
+1. Install python if it isn't already available on your OS of choice
+1. Install the easy_install tool (`sudo apt-get install python-setuptools`
+for Debian)
+1. Install the python package manager, `pip` (`easy_install pip`)
+1. Run the following command: `pip install -r requirements.txt`
+1. You should now be able to use the `docker-brew` script as such.
+
+## Basics
+
+	./docker-brew -h
+
+Display usage and help.
+
+	./docker-brew
+
+Default build from the default repo/branch. Images will be created under the
+`library/` namespace. Does not perform a remote push.
+
+	./docker-brew -n mycorp.com -b stable --push git://github.com/mycorp/docker
+
+Will fetch the library definition files in the `stable` branch of the
+`git://github.com/mycorp/docker` repository and create images under the
+`mycorp.com` namespace (e.g. `mycorp.com/ubuntu`). Created images will then
+be pushed to the official docker repository (pending: support for private
+repositories)
+
+## Library definition files
+
+The library definition files are plain text files found in the `library/`
+subfolder of the docker repository.
+
+### File names
+
+The name of a definition file will determine the name of the image(s) it
+creates. For example, the `library/ubuntu` file will create images in the
+`<namespace>/ubuntu` repository. If multiple instructions are present in
+a single file, all images are expected to be created under a different tag.
+
+### Instruction format
+
+Each line represents a build instruction.
+There are different formats that `docker-brew` is able to parse.
+
+	<git-url>
+	git://github.com/dotcloud/hipache
+	https://github.com/dotcloud/docker.git
+
+The simplest format. `docker-brew` will fetch data from the provided git
+repository from the `HEAD`of its `master` branch. Generated image will be
+tagged as `latest`. Use of this format is discouraged because there is no
+way to ensure stability.
+
+	<docker-tag> <git-url>
+	bleeding-edge git://github.com/dotcloud/docker
+	unstable https://github.com/dotcloud/docker-redis.git
+
+A more advanced format. `docker-brew` will fetch data from the provided git
+repository from the `HEAD`of its `master` branch. Generated image will be
+tagged as `<docker-tag>`. Recommended if we always want to provide a snapshot
+of the latest development. Again, no way to ensure stability.
+
+	<docker-tag>	<git-url>	T:<git-tag>
+	2.4.0 	git://github.com/dotcloud/docker-redis	T:2.4.0
+	<docker-tag>	<git-url>	B:<git-branch>
+	zfs		git://github.com/dotcloud/docker	B:zfs-support
+	<docker-tag>	<git-url>	C:<git-commit-id>
+	2.2.0 	https://github.com/dotcloud/docker-redis.git C:a4bf8923ee4ec566d3ddc212
+
+The most complete format. `docker-brew` will fetch data from the provided git
+repository from the provided reference (if it's a branch, brew will fetch its
+`HEAD`). Generated image will be tagged as `<docker-tag>`. Recommended whenever
+possible.

contrib/brew/brew/__init__.py

@@ -0,0 +1 @@
+from brew import build_library

contrib/brew/brew/brew.py

@@ -0,0 +1,87 @@
+import os
+import logging
+
+import docker
+
+import git
+
+DEFAULT_REPOSITORY = 'git://github.com/dotcloud/docker'
+DEFAULT_BRANCH = 'library'
+
+logger = logging.getLogger(__name__)
+logging.basicConfig(format='%(asctime)s %(levelname)s %(message)s',
+                    level='DEBUG')
+client = docker.Client()
+processed = {}
+
+
+def build_library(repository=None, branch=None, namespace=None, push=False):
+    if repository is None:
+        repository = DEFAULT_REPOSITORY
+    if branch is None:
+        branch = DEFAULT_BRANCH
+
+    logger.info('Cloning docker repo from {0}, branch: {1}'.format(
+        repository, branch))
+    #FIXME: set destination folder and only pull latest changes instead of
+    # cloning the whole repo everytime
+    dst_folder = git.clone_branch(repository, branch)
+    for buildfile in os.listdir(os.path.join(dst_folder, 'library')):
+        if buildfile == 'MAINTAINERS':
+            continue
+        f = open(os.path.join(dst_folder, 'library', buildfile))
+        for line in f:
+            logger.debug('{0} ---> {1}'.format(buildfile, line))
+            args = line.split()
+            try:
+                if len(args) > 3:
+                    raise RuntimeError('Incorrect line format, '
+                        'please refer to the docs')
+
+                url = None
+                ref = 'refs/heads/master'
+                tag = None
+                if len(args) == 1:  # Just a URL, simple mode
+                    url = args[0]
+                elif len(args) == 2 or len(args) == 3:  # docker-tag   url
+                    url = args[1]
+                    tag = args[0]
+
+                if len(args) == 3:  # docker-tag  url     B:branch or T:tag
+                    ref = None
+                    if args[2].startswith('B:'):
+                        ref = 'refs/heads/' + args[2][2:]
+                    elif args[2].startswith('T:'):
+                        ref = 'refs/tags/' + args[2][2:]
+                    elif args[2].startswith('C:'):
+                        ref = args[2][2:]
+                    else:
+                        raise RuntimeError('Incorrect line format, '
+                            'please refer to the docs')
+                img = build_repo(url, ref, buildfile, tag, namespace, push)
+                processed['{0}@{1}'.format(url, ref)] = img
+            except Exception as e:
+                logger.exception(e)
+        f.close()
+
+
+def build_repo(repository, ref, docker_repo, docker_tag, namespace, push):
+    docker_repo = '{0}/{1}'.format(namespace or 'library', docker_repo)
+    img_id = None
+    if '{0}@{1}'.format(repository, ref) not in processed.keys():
+        logger.info('Cloning {0} (ref: {1})'.format(repository, ref))
+        dst_folder = git.clone(repository, ref)
+        if not 'Dockerfile' in os.listdir(dst_folder):
+            raise RuntimeError('Dockerfile not found in cloned repository')
+        logger.info('Building using dockerfile...')
+        img_id, logs = client.build(path=dst_folder)
+
+    if not img_id:
+        img_id = processed['{0}@{1}'.format(repository, ref)]
+    logger.info('Committing to {0}:{1}'.format(docker_repo,
+        docker_tag or 'latest'))
+    client.tag(img_id, docker_repo, docker_tag)
+    if push:
+        logger.info('Pushing result to the main registry')
+        client.push(docker_repo)
+    return img_id

contrib/brew/brew/git.py

@@ -0,0 +1,48 @@
+import tempfile
+import logging
+
+from dulwich import index
+from dulwich.client import get_transport_and_path
+from dulwich.repo import Repo
+
+logger = logging.getLogger(__name__)
+
+
+def clone_branch(repo_url, branch="master", folder=None):
+    return clone(repo_url, 'refs/heads/' + branch, folder)
+
+
+def clone_tag(repo_url, tag, folder=None):
+    return clone(repo_url, 'refs/tags/' + tag, folder)
+
+
+def clone(repo_url, ref=None, folder=None):
+    is_commit = False
+    if ref is None:
+        ref = 'refs/heads/master'
+    elif not ref.startswith('refs/'):
+        is_commit = True
+    logger.debug("clone repo_url={0}, ref={1}".format(repo_url, ref))
+    if folder is None:
+        folder = tempfile.mkdtemp()
+    logger.debug("folder = {0}".format(folder))
+    rep = Repo.init(folder)
+    client, relative_path = get_transport_and_path(repo_url)
+    logger.debug("client={0}".format(client))
+
+    remote_refs = client.fetch(relative_path, rep)
+    for k, v in remote_refs.iteritems():
+        try:
+            rep.refs.add_if_new(k, v)
+        except:
+            pass
+
+    if is_commit:
+        rep['HEAD'] = rep.commit(ref)
+    else:
+        rep['HEAD'] = remote_refs[ref]
+    indexfile = rep.index_path()
+    tree = rep["HEAD"].tree
+    index.build_index_from_tree(rep.path, indexfile, rep.object_store, tree)
+    logger.debug("done")
+    return folder

contrib/brew/docker-brew

@@ -0,0 +1,25 @@
+#!/usr/bin/env python
+
+import argparse
+
+import brew
+
+
+DEFAULT_REPOSITORY = 'git://github.com/dotcloud/docker'
+DEFAULT_BRANCH = 'library'
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser('Build the docker standard library')
+    parser.add_argument('--push', action='store_true', default=False,
+        help='push generated repositories to the official registry')
+    parser.add_argument('-n', metavar='NAMESPACE', default='library',
+        help='namespace used for generated repositories.'
+        ' Default is library')
+    parser.add_argument('-b', metavar='BRANCH', default=DEFAULT_BRANCH,
+        help='branch in the repository where the library definition'
+        ' files will be fetched. Default is ' + DEFAULT_BRANCH)
+    parser.add_argument('repository', default=DEFAULT_REPOSITORY, nargs='?',
+        help='git repository containing the library definition files.'
+        ' Default is ' + DEFAULT_REPOSITORY)
+    args = parser.parse_args()
+    brew.build_library(args.repository, args.b, args.n, args.push)

contrib/brew/requirements.txt

@@ -0,0 +1,2 @@
+dulwich==0.9.0
+docker==0.1.0

contrib/brew/setup.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+import os
+from setuptools import setup
+
+ROOT_DIR = os.path.dirname(__file__)
+SOURCE_DIR = os.path.join(ROOT_DIR)
+
+test_requirements = []
+setup(
+    name="docker-brew",
+    version='0.0.1',
+    description="-",
+    packages=['dockerbrew'],
+    install_requires=['dulwich', 'docker'] + test_requirements,
+    zip_safe=False,
+    classifiers=['Development Status :: 3 - Alpha',
+                 'Environment :: Other Environment',
+                 'Intended Audience :: Developers',
+                 'Operating System :: OS Independent',
+                 'Programming Language :: Python',
+                 'Topic :: Utilities'],
+    )