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# Copyright (C) 2013 Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import cliapp
import gzip
import os
import shutil
import tarfile
import tempfile
import uuid
import morphlib
import morphlib.plugins.branch_and_merge_plugin
class DeployPlugin(cliapp.Plugin):
def enable(self):
self.app.add_subcommand(
'deploy', self.deploy,
arg_synopsis='TYPE SYSTEM LOCATION [KEY=VALUE]')
self.other = \
morphlib.plugins.branch_and_merge_plugin.BranchAndMergePlugin()
def disable(self):
pass
def deploy(self, args):
'''Build a system from the current system branch'''
if len(args) < 3:
raise cliapp.AppException('morph build expects exactly one '
'parameter: the system to build')
deployment_type = args[0]
system_name = args[1]
location = args[2]
env_vars = args[3:]
# Deduce workspace and system branch and branch root repository.
workspace = self.other.deduce_workspace()
branch, branch_dir = self.other.deduce_system_branch()
branch_root = self.other.get_branch_config(branch_dir, 'branch.root')
branch_uuid = self.other.get_branch_config(branch_dir, 'branch.uuid')
# Generate a UUID for the build.
build_uuid = uuid.uuid4().hex
build_command = morphlib.buildcommand.BuildCommand(self.app)
build_command = self.app.hookmgr.call('new-build-command',
build_command)
push = self.app.settings['push-build-branches']
self.app.status(msg='Starting build %(uuid)s', uuid=build_uuid)
self.app.status(msg='Collecting morphologies involved in '
'building %(system)s from %(branch)s',
system=system_name, branch=branch)
# Get repositories of morphologies involved in building this system
# from the current system branch.
build_repos = self.other.get_system_build_repos(
branch, branch_dir, branch_root, system_name)
# Generate temporary build ref names for all these repositories.
self.other.generate_build_ref_names(build_repos, branch_uuid)
# Create the build refs for all these repositories and commit
# all uncommitted changes to them, updating all references
# to system branch refs to point to the build refs instead.
self.other.update_build_refs(build_repos, branch, build_uuid, push)
if push:
self.other.push_build_refs(build_repos)
build_branch_root = branch_root
else:
dirname = build_repos[branch_root]['dirname']
build_branch_root = urlparse.urljoin('file://', dirname)
# Run the build.
build_ref = build_repos[branch_root]['build-ref']
order = build_command.compute_build_order(
build_branch_root,
build_ref,
system_name + '.morph')
artifact = order.groups[-1][-1]
if push:
self.other.delete_remote_build_refs(build_repos)
# Unpack the artifact (tarball) to a temporary directory.
self.app.status(msg='Unpacking system for configuration')
system_tree = tempfile.mkdtemp()
if build_command.lac.has(artifact):
f = build_command.lac.get(artifact)
else:
f = build_command.rac.get(artifact)
ff = gzip.GzipFile(fileobj=f)
tf = tarfile.TarFile(fileobj=ff)
tf.extractall(path=system_tree)
self.app.status(
msg='System unpacked at %(system_tree)s',
system_tree=system_tree)
# Set up environment for running extensions.
env = dict(os.environ)
for spec in env_vars:
name, value = spec.split('=', 1)
if name in env:
raise morphlib.Error(
'%s is already set in the enviroment' % name)
env[name] = value
# Run configuration extensions.
self.app.status(msg='Configure system')
m = artifact.source.morphology
if 'configuration-extensions' in m:
names = m['configuration-extensions']
for name in names:
self._run_extension(
build_branch_root,
build_ref,
name,
'.configure',
[system_tree],
env)
# Run write extension.
self.app.status(msg='Writing to device')
self._run_extension(
build_branch_root,
build_ref,
name,
'.write',
[system_tree, location],
env)
# Cleanup.
self.app.status(msg='Cleaning up')
shutil.rmtree(system_tree)
self.app.status(msg='Finished deployment')
def _run_extension(self, repo_dir, ref, name, kind, args, env):
'''Run an extension.
The ``kind`` should be either ``.configure`` or ``.write``,
depending on the kind of extension that is sought.
The extension is found either in the git repository of the
system morphology (repo, ref), or with the Morph code.
'''
ext = self._cat_file(repo_dir, ref, name + kind)
if ext is None:
code_dir = os.path.dirname(morphlib.__file__)
ext_filename = os.path.join(code_dir, 'exts', name + kind)
if not os.path.exists(ext_filename):
raise morphlib.Error(
'Could not find extenstion %s%s' % (name, kind))
delete_ext = False
else:
fd, ext_filename = tempfile.mkstemp()
os.write(fd, ext)
os.close(fd)
os.chmod(ext_filename, 0700)
delete_ext = True
self.app.runcmd(
[ext_filename] + args, env=env, stdout=None, stderr=None)
if delete_ext:
os.remove(ext_filename)
def _cat_file(self, repo_dir, ref, pathname):
'''Retrieve contents of a file from a git repository.'''
argv = ['git', 'cat-file', 'blob', '%s:%s' % (ref, filename)]
try:
return self.app.runcmd(argv, cwd=repo_dir)
except cliapp.AppException:
return None
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