annotate env/lib/python3.7/site-packages/cwltool/docker_id.py @ 4:79f47841a781 draft

"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:47:39 -0400
parents 26e78fe6e8c4
children
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1 """Helper functions for docker."""
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2 from __future__ import absolute_import, print_function
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3
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4 from typing import List, Optional, Tuple, cast # pylint: disable=unused-import
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5
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6 from typing_extensions import Text # pylint: disable=unused-import
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7 # move to a regular typing import when Python 3.3-3.6 is no longer supported
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8
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9 from .utils import subprocess
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10
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11
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12 def docker_vm_id(): # type: () -> Tuple[Optional[int], Optional[int]]
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13 """
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14 Return the User ID and Group ID of the default docker user inside the VM.
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15
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16 When a host is using boot2docker or docker-machine to run docker with
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17 boot2docker.iso (As on Mac OS X), the UID that mounts the shared filesystem
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18 inside the VirtualBox VM is likely different than the user's UID on the host.
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19 :return: A tuple containing numeric User ID and Group ID of the docker account inside
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20 the boot2docker VM
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21 """
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22 if boot2docker_running():
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23 return boot2docker_id()
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24 if docker_machine_running():
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25 return docker_machine_id()
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26 return (None, None)
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27
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28
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29 def check_output_and_strip(cmd): # type: (List[Text]) -> Optional[Text]
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30 """
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31 Pass a command list to subprocess.check_output.
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32
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33 Returning None if an expected exception is raised
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34 :param cmd: The command to execute
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35 :return: Stripped string output of the command, or None if error
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36 """
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37 try:
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38 result = subprocess.check_output(cmd, stderr=subprocess.STDOUT, universal_newlines=True)
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39 return cast(str, result).strip()
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40 except (OSError, subprocess.CalledProcessError, TypeError, AttributeError):
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41 # OSError is raised if command doesn't exist
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42 # CalledProcessError is raised if command returns nonzero
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43 # AttributeError is raised if result cannot be strip()ped
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44 return None
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45
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46
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47 def docker_machine_name(): # type: () -> Optional[Text]
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48 """
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49 Get the machine name of the active docker-machine machine.
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50
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51 :return: Name of the active machine or None if error
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52 """
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53 return check_output_and_strip(['docker-machine', 'active'])
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54
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55
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56 def cmd_output_matches(check_cmd, expected_status):
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57 # type: (List[Text], Text) -> bool
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58 """
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59 Run a command and compares output to expected.
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60
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61 :param check_cmd: Command list to execute
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62 :param expected_status: Expected output, e.g. "Running" or "poweroff"
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63 :return: Boolean value, indicating whether or not command result matched
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64 """
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65 return check_output_and_strip(check_cmd) == expected_status
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66
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67
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68 def boot2docker_running(): # type: () -> bool
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69 """
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70 Check if boot2docker CLI reports that boot2docker vm is running.
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71
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72 :return: True if vm is running, False otherwise
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73 """
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74 return cmd_output_matches(['boot2docker', 'status'], 'running')
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75
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76
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77 def docker_machine_running(): # type: () -> bool
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78 """
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79 Ask docker-machine for the active machine and checks if its VM is running.
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80
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81 :return: True if vm is running, False otherwise
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82 """
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83 machine_name = docker_machine_name()
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84 if not machine_name:
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85 return False
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86 return cmd_output_matches(['docker-machine', 'status', machine_name], 'Running')
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87
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88
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89 def cmd_output_to_int(cmd): # type: (List[Text]) -> Optional[int]
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90 """
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91 Run the provided command and returns the integer value of the result.
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92
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93 :param cmd: The command to run
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94 :return: Integer value of result, or None if an error occurred
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95 """
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96 result = check_output_and_strip(cmd) # may return None
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97 if result is not None:
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98 try:
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99 return int(result)
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100 except ValueError:
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101 # ValueError is raised if int conversion fails
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102 return None
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103 return None
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104
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105
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106 def boot2docker_id(): # type: () -> Tuple[Optional[int], Optional[int]]
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107 """
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108 Get the UID and GID of the docker user inside a running boot2docker vm.
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109
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110 :return: Tuple (UID, GID), or (None, None) if error (e.g. boot2docker not present or stopped)
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111 """
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112 uid = cmd_output_to_int(['boot2docker', 'ssh', 'id', '-u'])
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113 gid = cmd_output_to_int(['boot2docker', 'ssh', 'id', '-g'])
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114 return (uid, gid)
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115
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116 def docker_machine_id(): # type: () -> Tuple[Optional[int], Optional[int]]
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117 """
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118 Ask docker-machine for active machine and gets the UID of the docker user.
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119
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120 inside the vm
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121 :return: tuple (UID, GID), or (None, None) if error (e.g. docker-machine not present or stopped)
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122 """
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123 machine_name = docker_machine_name()
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124 if not machine_name:
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125 return (None, None)
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126 uid = cmd_output_to_int(['docker-machine', 'ssh', machine_name, "id -u"])
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127 gid = cmd_output_to_int(['docker-machine', 'ssh', machine_name, "id -g"])
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128 return (uid, gid)
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129
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130
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131 if __name__ == '__main__':
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132 print(docker_vm_id())