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#
# Copyright (C) 2018-2019 Bloomberg Finance LP
#
# 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/>.
import os
import shlex
from .sandbox import Sandbox, SandboxCommandError, _SandboxBatch
from .. import utils
from .._exceptions import ImplError, SandboxError
from .._protos.build.bazel.remote.execution.v2 import remote_execution_pb2
from ..storage._casbaseddirectory import CasBasedDirectory
# SandboxREAPI()
#
# Abstract class providing a skeleton for sandbox implementations based on
# the Remote Execution API.
#
class SandboxREAPI(Sandbox):
def _use_cas_based_directory(self):
# Always use CasBasedDirectory for REAPI
return True
def _run(self, command, flags, *, cwd, env):
stdout, stderr = self._get_output()
context = self._get_context()
cascache = context.get_cascache()
# set up virtual dircetory
vdir = self.get_virtual_directory()
if not self._has_command(command[0], env):
raise SandboxCommandError(
"Staged artifacts do not provide command " "'{}'".format(command[0]), reason="missing-command"
)
# Ensure working directory exists
if len(cwd) > 1:
assert cwd.startswith("/")
vdir.descend(*cwd[1:].split(os.path.sep), create=True)
# Ensure directories required for sandboxed execution exist
for directory in ["dev", "proc", "tmp"]:
vdir.descend(directory, create=True)
# Create directories for all marked directories. This emulates
# some of the behaviour of other sandboxes, which create these
# to use as mount points.
for mark in self._get_marked_directories():
directory = mark["directory"]
# Create each marked directory
vdir.descend(*directory.split(os.path.sep), create=True)
# Generate Action proto
input_root_digest = vdir._get_digest()
command_proto = self._create_command(command, cwd, env)
command_digest = cascache.add_object(buffer=command_proto.SerializeToString())
action = remote_execution_pb2.Action(command_digest=command_digest, input_root_digest=input_root_digest)
action_result = self._execute_action(action) # pylint: disable=assignment-from-no-return
# Get output of build
self._process_job_output(
action_result.output_directories, action_result.output_files, failure=action_result.exit_code != 0
)
if stdout:
if action_result.stdout_raw:
stdout.write(str(action_result.stdout_raw, "utf-8", errors="ignore"))
if stderr:
if action_result.stderr_raw:
stderr.write(str(action_result.stderr_raw, "utf-8", errors="ignore"))
# Non-zero exit code means a normal error during the build:
# the remote execution system has worked correctly but the command failed.
return action_result.exit_code
def _create_command(self, command, working_directory, environment):
# Creates a command proto
environment_variables = [
remote_execution_pb2.Command.EnvironmentVariable(name=k, value=v) for (k, v) in environment.items()
]
# Request the whole directory tree as output
output_directory = os.path.relpath(os.path.sep, start=working_directory)
return remote_execution_pb2.Command(
arguments=command,
working_directory=working_directory[1:],
environment_variables=environment_variables,
output_files=[],
output_directories=[output_directory],
platform=None,
)
def _process_job_output(self, output_directories, output_files, *, failure):
# Reads the remote execution server response to an execution request.
#
# output_directories is an array of OutputDirectory objects.
# output_files is an array of OutputFile objects.
#
# We only specify one output_directory, so it's an error
# for there to be any output files or more than one directory at the moment.
#
if output_files:
raise SandboxError("Output files were returned when we didn't request any.")
if not output_directories:
error_text = "No output directory was returned from the build server."
raise SandboxError(error_text)
if len(output_directories) > 1:
error_text = "More than one output directory was returned from the build server: {}."
raise SandboxError(error_text.format(output_directories))
tree_digest = output_directories[0].tree_digest
if tree_digest is None or not tree_digest.hash:
raise SandboxError("Output directory structure had no digest attached.")
context = self._get_context()
cascache = context.get_cascache()
# Get digest of root directory from tree digest
tree = remote_execution_pb2.Tree()
with open(cascache.objpath(tree_digest), "rb") as f:
tree.ParseFromString(f.read())
root_directory = tree.root.SerializeToString()
dir_digest = utils._message_digest(root_directory)
# At the moment, we will get the whole directory back in the first directory argument and we need
# to replace the sandbox's virtual directory with that. Creating a new virtual directory object
# from another hash will be interesting, though...
new_dir = CasBasedDirectory(cascache, digest=dir_digest)
self._set_virtual_directory(new_dir)
def _create_batch(self, main_group, flags, *, collect=None):
return _SandboxREAPIBatch(self, main_group, flags, collect=collect)
def _execute_action(self, action):
raise ImplError("Sandbox of type '{}' does not implement _execute_action()".format(type(self).__name__))
# _SandboxREAPIBatch()
#
# Command batching by shell script generation.
#
class _SandboxREAPIBatch(_SandboxBatch):
def __init__(self, sandbox, main_group, flags, *, collect=None):
super().__init__(sandbox, main_group, flags, collect=collect)
self.script = None
self.first_command = None
self.cwd = None
self.env = None
def execute(self):
self.script = ""
self.main_group.execute(self)
first = self.first_command
if first and self.sandbox.run(["sh", "-c", "-e", self.script], self.flags, cwd=first.cwd, env=first.env) != 0:
raise SandboxCommandError("Command execution failed", collect=self.collect)
def execute_group(self, group):
group.execute_children(self)
def execute_command(self, command):
if self.first_command is None:
# First command in batch
# Initial working directory and environment of script already matches
# the command configuration.
self.first_command = command
else:
# Change working directory for this command
if command.cwd != self.cwd:
self.script += "mkdir -p {}\n".format(command.cwd)
self.script += "cd {}\n".format(command.cwd)
# Update environment for this command
for key in self.env.keys():
if key not in command.env:
self.script += "unset {}\n".format(key)
for key, value in command.env.items():
if key not in self.env or self.env[key] != value:
self.script += "export {}={}\n".format(key, shlex.quote(value))
# Keep track of current working directory and environment
self.cwd = command.cwd
self.env = command.env
# Actual command execution
cmdline = " ".join(shlex.quote(cmd) for cmd in command.command)
self.script += "(set -ex; {})".format(cmdline)
# Error handling
label = command.label or cmdline
quoted_label = shlex.quote("'{}'".format(label))
self.script += " || (echo Command {} failed with exitcode $? >&2 ; exit 1)\n".format(quoted_label)
def execute_call(self, call):
raise SandboxError("SandboxRemote does not support callbacks in command batches")
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