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103 lines
3.1 KiB
Python
103 lines
3.1 KiB
Python
from __future__ import unicode_literals
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import os
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import os.path
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import subprocess
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class CalledProcessError(RuntimeError):
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def __init__(self, returncode, cmd, expected_returncode, output=None):
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super(CalledProcessError, self).__init__(
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returncode, cmd, expected_returncode, output,
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)
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self.returncode = returncode
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self.cmd = cmd
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self.expected_returncode = expected_returncode
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self.output = output
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def __str__(self):
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return (
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'Command: {0!r}\n'
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'Return code: {1}\n'
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'Expected return code: {2}\n'
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'Output: {3!r}\n'.format(
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self.cmd,
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self.returncode,
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self.expected_returncode,
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self.output,
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)
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)
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def _replace_cmd(cmd, **kwargs):
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return [part.format(**kwargs) for part in cmd]
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class PrefixedCommandRunner(object):
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"""A PrefixedCommandRunner allows you to run subprocess commands with
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comand substitution.
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For instance:
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PrefixedCommandRunner('/tmp/foo').run(['{prefix}foo.sh', 'bar', 'baz'])
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will run ['/tmp/foo/foo.sh', 'bar', 'baz']
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"""
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def __init__(
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self,
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prefix_dir,
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popen=subprocess.Popen,
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makedirs=os.makedirs
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):
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self.prefix_dir = prefix_dir.rstrip(os.sep) + os.sep
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self.__popen = popen
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self.__makedirs = makedirs
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def _create_path_if_not_exists(self):
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if not os.path.exists(self.prefix_dir):
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self.__makedirs(self.prefix_dir)
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def run(self, cmd, retcode=0, stdin=None, encoding='UTF-8', **kwargs):
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popen_kwargs = {
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'stdin': subprocess.PIPE,
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'stdout': subprocess.PIPE,
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'stderr': subprocess.PIPE,
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}
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if stdin is not None:
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stdin = stdin.encode('UTF-8')
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popen_kwargs.update(kwargs)
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self._create_path_if_not_exists()
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replaced_cmd = _replace_cmd(cmd, prefix=self.prefix_dir)
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proc = self.__popen(replaced_cmd, **popen_kwargs)
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stdout, stderr = proc.communicate(stdin)
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if encoding is not None:
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stdout = stdout.decode(encoding)
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if encoding is not None:
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stderr = stderr.decode(encoding)
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returncode = proc.returncode
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if retcode is not None and retcode != returncode:
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raise CalledProcessError(
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returncode, replaced_cmd, retcode, output=(stdout, stderr),
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)
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return proc.returncode, stdout, stderr
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def path(self, *parts):
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path = os.path.join(self.prefix_dir, *parts)
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return os.path.normpath(path)
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def exists(self, *parts):
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return os.path.exists(self.path(*parts))
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@classmethod
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def from_command_runner(cls, command_runner, path_end):
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"""Constructs a new command runner from an existing one by appending
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`path_end` to the command runner's prefix directory.
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"""
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return cls(
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command_runner.path(path_end),
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popen=command_runner.__popen,
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makedirs=command_runner.__makedirs,
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)
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