176 lines
6 KiB
Python
176 lines
6 KiB
Python
# -*- coding: utf-8 -*-
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#
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# 2016-2017 Darko Poljak (darko.poljak at gmail.com)
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#
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# This file is part of cdist.
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#
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# cdist is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# cdist is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with cdist. If not, see <http://www.gnu.org/licenses/>.
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#
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#
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import subprocess
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import os
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from tempfile import TemporaryFile
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import cdist
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# IMPORTANT:
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# with the code below in python 3.5 when command is executed and error
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# occurs then stderr is not captured.
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# As it seems from documentation, it is only captured when using
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# subprocess.run method with stderr=subprocess.PIPE and is captured
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# into CompletedProcess resulting object or into CalledProcessError
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# in case of error (only if specified capturing).
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#
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# If using PIPE then the run is slow. run method uses communicate method
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# and internally it uses buffering.
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#
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# For now we will use capturing only stdout. stderr is written directly to
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# stderr from child process.
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#
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# STDERR_UNSUPPORTED = '<Not supported in this python version>'
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#
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#
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# def call_get_output(command, env=None):
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# """Run the given command with the given environment.
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# Return the tuple of stdout and stderr output as a byte strings.
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# """
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#
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# assert isinstance(command, (list, tuple)), (
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# "list or tuple argument expected, got: {}".format(command))
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#
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# if sys.version_info >= (3, 5):
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# return call_get_out_err(command, env)
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# else:
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# return (call_get_stdout(command, env), STDERR_UNSUPPORTED)
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#
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#
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# def handle_called_process_error(err, command):
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# if sys.version_info >= (3, 5):
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# errout = err.stderr
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# else:
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# errout = STDERR_UNSUPPORTED
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# raise cdist.Error("Command failed: " + " ".join(command) +
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# " with returncode: {} and stdout: {}, stderr: {}".format(
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# err.returncode, err.output, errout))
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#
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#
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# def call_get_stdout(command, env=None):
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# """Run the given command with the given environment.
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# Return the stdout output as a byte string, stderr is ignored.
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# """
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# assert isinstance(command, (list, tuple)), (
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# "list or tuple argument expected, got: {}".format(command))
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#
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# with TemporaryFile() as fout:
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# subprocess.check_call(command, env=env, stdout=fout)
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# fout.seek(0)
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# output = fout.read()
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#
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# return output
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#
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#
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# def call_get_out_err(command, env=None):
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# """Run the given command with the given environment.
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# Return the tuple of stdout and stderr output as a byte strings.
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# """
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# assert isinstance(command, (list, tuple)), (
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# "list or tuple argument expected, got: {}".format(command))
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#
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# with TemporaryFile() as fout, TemporaryFile() as ferr:
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# subprocess.check_call(command, env=env,
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# stdout=fout, stderr=ferr)
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# fout.seek(0)
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# ferr.seek(0)
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# output = (fout.read(), ferr.read())
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#
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# return output
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#
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# The code below with bufsize=0 does not work either, communicate
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# internally uses buffering. It works in case of error, but if everything
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# is ok and there is no output in stderr then execution is very very slow.
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#
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# def _call_get_out_err(command, env=None):
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# """Run the given command with the given environment.
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# Return the tuple of stdout and stderr output as a byte strings.
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# """
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# assert isinstance(command, (list, tuple)), (
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# "list or tuple argument expected, got: {}".format(command))
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#
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# result = subprocess.run(command, env=env, bufsize=0,
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# stdout=subprocess.PIPE, stderr=subprocess.PIPE, check=True)
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#
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# return (result.stdout, result.stderr)
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# Currently not used.
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def call_get_output(command, env=None, stderr=None):
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"""Run the given command with the given environment.
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Return the tuple of stdout and stderr output as a byte strings.
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"""
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assert isinstance(command, (list, tuple)), (
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"list or tuple argument expected, got: {}".format(command))
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return (_call_get_stdout(command, env, stderr), None)
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def handle_called_process_error(err, command):
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# Currently, stderr is not captured.
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# errout = None
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# raise cdist.Error("Command failed: " + " ".join(command) +
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# (" with returncode: {}\n"
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# "stdout: {}\n"
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# "stderr: {}").format(
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# err.returncode, err.output, errout))
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if err.output:
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output = err.output
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else:
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output = ''
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raise cdist.Error(("Command failed: '{}'\n"
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"return code: {}\n"
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"---- BEGIN stdout ----\n"
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"{}" + ("\n" if output else "") +
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"---- END stdout ----").format(
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" ".join(command), err.returncode, output))
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# Currently not used.
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def _call_get_stdout(command, env=None, stderr=None):
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"""Run the given command with the given environment.
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Return the stdout output as a byte string, stderr is ignored.
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"""
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assert isinstance(command, (list, tuple)), (
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"list or tuple argument expected, got: {}".format(command))
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with TemporaryFile() as fout:
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subprocess.check_call(command, env=env, stdout=fout, stderr=stderr)
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fout.seek(0)
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output = fout.read()
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return output
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def get_std_fd(base_path, name):
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path = os.path.join(base_path, name)
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stdfd = open(path, 'ba+')
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return stdfd
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def log_std_fd(log, command, stdfd, prefix):
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if stdfd is not None and stdfd != subprocess.DEVNULL:
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stdfd.seek(0, 0)
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log.trace("Command: {}; {}: {}".format(
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command, prefix, stdfd.read().decode()))
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