--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/env/lib/python3.9/site-packages/cwltool/docker_id.py	Mon Mar 22 18:12:50 2021 +0000
@@ -0,0 +1,129 @@
+"""Helper functions for docker."""
+
+import subprocess  # nosec
+from typing import List, Optional, Tuple
+
+
+def docker_vm_id() -> Tuple[Optional[int], Optional[int]]:
+    """
+    Return the User ID and Group ID of the default docker user inside the VM.
+
+    When a host is using boot2docker or docker-machine to run docker with
+    boot2docker.iso (As on Mac OS X), the UID that mounts the shared filesystem
+    inside the VirtualBox VM is likely different than the user's UID on the host.
+    :return: A tuple containing numeric User ID and Group ID of the docker account inside
+    the boot2docker VM
+    """
+    if boot2docker_running():
+        return boot2docker_id()
+    if docker_machine_running():
+        return docker_machine_id()
+    return (None, None)
+
+
+def check_output_and_strip(cmd: List[str]) -> Optional[str]:
+    """
+    Pass a command list to subprocess.check_output.
+
+    Returning None if an expected exception is raised
+    :param cmd: The command to execute
+    :return: Stripped string output of the command, or None if error
+    """
+    try:
+        result = subprocess.check_output(  # nosec
+            cmd, stderr=subprocess.STDOUT, universal_newlines=True
+        )
+        return result.strip()
+    except (OSError, subprocess.CalledProcessError, TypeError, AttributeError):
+        # OSError is raised if command doesn't exist
+        # CalledProcessError is raised if command returns nonzero
+        # AttributeError is raised if result cannot be strip()ped
+        return None
+
+
+def docker_machine_name() -> Optional[str]:
+    """
+    Get the machine name of the active docker-machine machine.
+
+    :return: Name of the active machine or None if error
+    """
+    return check_output_and_strip(["docker-machine", "active"])
+
+
+def cmd_output_matches(check_cmd: List[str], expected_status: str) -> bool:
+    """
+    Run a command and compares output to expected.
+
+    :param check_cmd: Command list to execute
+    :param expected_status: Expected output, e.g. "Running" or "poweroff"
+    :return: Boolean value, indicating whether or not command result matched
+    """
+    return check_output_and_strip(check_cmd) == expected_status
+
+
+def boot2docker_running() -> bool:
+    """
+    Check if boot2docker CLI reports that boot2docker vm is running.
+
+    :return: True if vm is running, False otherwise
+    """
+    return cmd_output_matches(["boot2docker", "status"], "running")
+
+
+def docker_machine_running() -> bool:
+    """
+    Ask docker-machine for the active machine and checks if its VM is running.
+
+    :return: True if vm is running, False otherwise
+    """
+    machine_name = docker_machine_name()
+    if not machine_name:
+        return False
+    return cmd_output_matches(["docker-machine", "status", machine_name], "Running")
+
+
+def cmd_output_to_int(cmd: List[str]) -> Optional[int]:
+    """
+    Run the provided command and returns the integer value of the result.
+
+    :param cmd: The command to run
+    :return: Integer value of result, or None if an error occurred
+    """
+    result = check_output_and_strip(cmd)  # may return None
+    if result is not None:
+        try:
+            return int(result)
+        except ValueError:
+            # ValueError is raised if int conversion fails
+            return None
+    return None
+
+
+def boot2docker_id() -> Tuple[Optional[int], Optional[int]]:
+    """
+    Get the UID and GID of the docker user inside a running boot2docker vm.
+
+    :return: Tuple (UID, GID), or (None, None) if error (e.g. boot2docker not present or stopped)
+    """
+    uid = cmd_output_to_int(["boot2docker", "ssh", "id", "-"])
+    gid = cmd_output_to_int(["boot2docker", "ssh", "id", "-g"])
+    return (uid, gid)
+
+
+def docker_machine_id() -> Tuple[Optional[int], Optional[int]]:
+    """
+    Ask docker-machine for active machine and gets the UID of the docker user.
+
+    inside the vm
+    :return: tuple (UID, GID), or (None, None) if error (e.g. docker-machine not present or stopped)
+    """
+    machine_name = docker_machine_name()
+    if not machine_name:
+        return (None, None)
+    uid = cmd_output_to_int(["docker-machine", "ssh", machine_name, "id -"])
+    gid = cmd_output_to_int(["docker-machine", "ssh", machine_name, "id -g"])
+    return (uid, gid)
+
+
+if __name__ == "__main__":
+    print(docker_vm_id())