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# Copyright (C) 2017 Codethink Limited
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
#
# Authors:
# Jonathan Maw <jonathan.maw@codethink.co.uk>
"""
bzr - stage files from a bazaar repository
==========================================
**Host dependencies:**
* bzr
**Usage:**
.. code:: yaml
# Specify the bzr source kind
kind: bzr
# Specify the bzr url. Bazaar URLs come in many forms, see
# `bzr help urlspec` for more information. Using an alias defined
# in your project configuration is encouraged.
url: https://launchpad.net/bzr
# Specify the tracking branch. This is mandatory, as bzr cannot identify
# an individual revision outside its branch. bzr URLs that omit the branch
# name implicitly specify the trunk branch, but bst requires this to be
# explicit.
track: trunk
# Specify the ref. This is a revision number. This is usually a decimal,
# but revisions on a branch are of the form
# <revision-branched-from>.<branch-number>.<revision-since-branching>
# e.g. 6622.1.6.
# The ref must be specified to build, and 'bst source track' will update the
# revision number to the one on the tip of the branch specified in 'track'.
ref: 6622
See :ref:`built-in functionality doumentation <core_source_builtins>` for
details on common configuration options for sources.
"""
import os
import shutil
import fcntl
from contextlib import contextmanager
from buildstream import Source, SourceError
from buildstream import utils
class BzrSource(Source):
# pylint: disable=attribute-defined-outside-init
def configure(self, node):
node.validate_keys(["url", "track", "ref", *Source.COMMON_CONFIG_KEYS])
self.original_url = node.get_str("url")
self.tracking = node.get_str("track")
self.ref = node.get_str("ref", None)
self.url = self.translate_url(self.original_url)
def preflight(self):
# Check if bzr is installed, get the binary at the same time.
self.host_bzr = utils.get_host_tool("bzr")
def get_unique_key(self):
return [self.original_url, self.tracking, self.ref]
def is_cached(self):
with self._locked():
return self._check_ref()
def load_ref(self, node):
self.ref = node.get_str("ref", None)
def get_ref(self):
return self.ref
def set_ref(self, ref, node):
node["ref"] = self.ref = ref
def track(self): # pylint: disable=arguments-differ
with self.timed_activity("Tracking {}".format(self.url), silent_nested=True), self._locked():
self._ensure_mirror(skip_ref_check=True)
ret, out = self.check_output(
[self.host_bzr, "version-info", "--custom", "--template={revno}", self._get_branch_dir()],
fail="Failed to read the revision number at '{}'".format(self._get_branch_dir()),
)
if ret != 0:
raise SourceError("{}: Failed to get ref for tracking {}".format(self, self.tracking))
return out
def fetch(self): # pylint: disable=arguments-differ
with self.timed_activity("Fetching {}".format(self.url), silent_nested=True), self._locked():
self._ensure_mirror()
def stage(self, directory):
self.call(
[
self.host_bzr,
"checkout",
"--lightweight",
"--revision=revno:{}".format(self.ref),
self._get_branch_dir(),
directory,
],
fail="Failed to checkout revision {} from branch {} to {}".format(
self.ref, self._get_branch_dir(), directory
),
)
# Remove .bzr dir
shutil.rmtree(os.path.join(directory, ".bzr"))
def init_workspace(self, directory):
url = os.path.join(self.url, self.tracking)
with self.timed_activity('Setting up workspace "{}"'.format(directory), silent_nested=True):
# Checkout from the cache
self.call(
[
self.host_bzr,
"branch",
"--use-existing-dir",
"--revision=revno:{}".format(self.ref),
self._get_branch_dir(),
directory,
],
fail="Failed to branch revision {} from branch {} to {}".format(
self.ref, self._get_branch_dir(), directory
),
)
# Switch the parent branch to the source's origin
self.call(
[self.host_bzr, "switch", "--directory={}".format(directory), url],
fail="Failed to switch workspace's parent branch to {}".format(url),
)
# _locked()
#
# This context manager ensures exclusive access to the
# bzr repository.
#
@contextmanager
def _locked(self):
lockdir = os.path.join(self.get_mirror_directory(), "locks")
lockfile = os.path.join(lockdir, utils.url_directory_name(self.original_url) + ".lock")
os.makedirs(lockdir, exist_ok=True)
with open(lockfile, "w") as lock:
fcntl.flock(lock, fcntl.LOCK_EX)
try:
yield
finally:
fcntl.flock(lock, fcntl.LOCK_UN)
def _check_ref(self):
# If the mirror doesnt exist yet, then we dont have the ref
if not os.path.exists(self._get_branch_dir()):
return False
return self.call([self.host_bzr, "revno", "--revision=revno:{}".format(self.ref), self._get_branch_dir()]) == 0
def _get_branch_dir(self):
return os.path.join(self._get_mirror_dir(), self.tracking)
def _get_mirror_dir(self):
return os.path.join(self.get_mirror_directory(), utils.url_directory_name(self.original_url))
def _ensure_mirror(self, skip_ref_check=False):
mirror_dir = self._get_mirror_dir()
bzr_metadata_dir = os.path.join(mirror_dir, ".bzr")
if not os.path.exists(bzr_metadata_dir):
self.call(
[self.host_bzr, "init-repo", "--no-trees", mirror_dir], fail="Failed to initialize bzr repository"
)
branch_dir = os.path.join(mirror_dir, self.tracking)
branch_url = self.url + "/" + self.tracking
if not os.path.exists(branch_dir):
# `bzr branch` the branch if it doesn't exist
# to get the upstream code
self.call(
[self.host_bzr, "branch", branch_url, branch_dir],
fail="Failed to branch from {} to {}".format(branch_url, branch_dir),
)
else:
# `bzr pull` the branch if it does exist
# to get any changes to the upstream code
self.call(
[self.host_bzr, "pull", "--directory={}".format(branch_dir), branch_url],
fail="Failed to pull new changes for {}".format(branch_dir),
)
if not skip_ref_check and not self._check_ref():
raise SourceError("Failed to ensure ref '{}' was mirrored".format(self.ref), reason="ref-not-mirrored")
def setup():
return BzrSource
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