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"""Utilities to call shell programs.""" |
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import os |
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import subprocess |
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import logging |
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import shutil |
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import stat |
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9
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from . import common |
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from .exceptions import ShellError |
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1 |
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12
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CMD_PREFIX = "$ " |
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OUT_PREFIX = "> " |
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1 |
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log = logging.getLogger(__name__) |
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16
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1 |
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18
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def call(name, *args, _show=True, _ignore=False, _shell=False): |
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"""Call a program with arguments. |
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:param name: name of program to call |
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:param args: list of command-line arguments |
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:param _show: display the call on stdout |
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:param _ignore: ignore non-zero return codes |
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:param _shell: force executing the program into a real shell |
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a Windows shell command (i.e: dir, echo) needs a real shell |
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but not a regular program (i.e: calc, git) |
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""" |
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program = show(name, *args, stdout=_show) |
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1 |
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command = subprocess.run( |
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[name, *args], universal_newlines=True, |
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stdout=subprocess.PIPE, stderr=subprocess.STDOUT, |
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shell=_shell |
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) |
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1 |
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37
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1 |
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for line in command.stdout.splitlines(): |
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log.debug(OUT_PREFIX + line.strip()) |
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39
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1 |
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40
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1 |
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if command.returncode == 0: |
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return command.stdout.strip() |
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1 |
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1 |
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elif _ignore: |
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log.debug("Ignored error from call to '%s'", name) |
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1 |
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else: |
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message = ( |
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"An external program call failed." + "\n\n" |
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"In working directory: " + os.getcwd() + "\n\n" |
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"The following command produced a non-zero return code:" + "\n\n" + |
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program + "\n" + |
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command.stdout |
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) |
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raise ShellError(message) |
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55
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56
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1 |
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57
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1 |
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def mkdir(path): |
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show('mkdir', '-p', path) |
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if not os.path.exists(path): |
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os.makedirs(path) |
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61
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62
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1 |
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63
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1 |
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def cd(path, _show=True): |
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show('cd', path, stdout=_show) |
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os.chdir(path) |
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66
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67
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1 |
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68
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1 |
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def ln(source, target): |
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if os.name == 'nt': |
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log.warning("Symlinks are not supported on Windows") |
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else: |
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dirpath = os.path.dirname(target) |
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if not os.path.isdir(dirpath): |
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mkdir(dirpath) |
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call('ln', '-s', source, target) |
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76
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77
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1 |
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78
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1 |
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def rm(path): |
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show('rm', '-rf', path) |
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if os.path.exists(path): |
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if os.path.isdir(path): |
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shutil.rmtree( |
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path, |
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84
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ignore_errors = False, |
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85
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onerror = rm_error_readonly |
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86
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1 |
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) |
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87
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1 |
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else: |
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os.remove(path) |
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1 |
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90
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91
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def show(name, *args, stdout=True): |
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program = CMD_PREFIX + ' '.join([name, *args]) |
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if stdout: |
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common.show(program, color='shell') |
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else: |
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log.debug(program) |
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return program |
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99
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100
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101
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def rm_error_readonly(func, path, exc_info): |
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102
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""" |
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103
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Error handler for ``shutil.rmtree``. |
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104
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105
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If the error is due to an access error (read only file) |
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it attempts to add write permission and then retries. |
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108
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If the error is for another reason it re-raises the error. |
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110
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Usage : ``shutil.rmtree(path, onerror=rm_error_readonly)`` |
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""" |
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112
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if not os.access(path, os.W_OK): |
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os.chmod(path, stat.S_IWUSR) |
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func(path) |
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else: |
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raise ShellError("Can not remove " + path + " due to permission") |
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jacebrowning /
gitman
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