`portalocker` error: FileNotFoundError: [Errno 2] No such file or directory

This is autogenerated. Please review and update as needed.

Describe the bug

Command Name az account get-access-token

Errors:

The command failed with an unexpected error. Here is the traceback:
[Errno 2] No such file or directory
Traceback (most recent call last):
  File "/opt/az/lib/python3.6/site-packages/knack/cli.py", line 231, in invoke
    cmd_result = self.invocation.execute(args)
  File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 657, in execute
    raise ex
  File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 720, in _run_jobs_serially
    results.append(self._run_job(expanded_arg, cmd_copy))
  File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 691, in _run_job
    result = cmd_copy(params)
  File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 328, in __call__
    return self.handler(*args, **kwargs)
  File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/command_operation.py", line 121, in handler
    return op(**command_args)
  File "/opt/az/lib/python3.6/site-packages/azure/cli/command_modules/profile/custom.py", line 75, in get_access_token
    tenant=tenant)
  File "/opt/az/lib/python3.6/site-packages/azure/cli/core/_profile.py", line 381, in get_raw_token
    credential = self._create_credential(account, tenant)
  File "/opt/az/lib/python3.6/site-packages/azure/cli/core/_profile.py", line 588, in _create_credential
    return identity.get_user_credential(username_or_sp_id)
  File "/opt/az/lib/python3.6/site-packages/azure/cli/core/auth/identity.py", line 182, in get_user_credential
    return UserCredential(self.client_id, username, **self._msal_app_kwargs)
  File "/opt/az/lib/python3.6/site-packages/azure/cli/core/auth/msal_authentication.py", line 41, in __init__
    accounts = self.get_accounts(username)
  File "/opt/az/lib/python3.6/site-packages/msal/application.py", line 872, in get_accounts
    accounts = self._find_msal_accounts(environment=self.authority.instance)
  File "/opt/az/lib/python3.6/site-packages/msal/application.py", line 912, in _find_msal_accounts
    query={"environment": environment})
  File "/opt/az/lib/python3.6/site-packages/msal_extensions/token_cache.py", line 53, in find
    with CrossPlatLock(self._lock_location):
  File "/opt/az/lib/python3.6/site-packages/msal_extensions/cache_lock.py", line 29, in __enter__
    file_handle = self._lock.__enter__()
  File "/opt/az/lib/python3.6/site-packages/portalocker/utils.py", line 199, in __enter__
    return self.acquire()
  File "/opt/az/lib/python3.6/site-packages/portalocker/utils.py", line 161, in acquire
    fh = self._prepare_fh(fh)
  File "/opt/az/lib/python3.6/site-packages/portalocker/utils.py", line 194, in _prepare_fh
    fh.truncate(0)
FileNotFoundError: [Errno 2] No such file or directory

To Reproduce:

Steps to reproduce the behavior. Note that argument values have been redacted, as they may contain sensitive information.

• Put any pre-requisite steps here…
• az account get-access-token --resource {} --subscription {} -o={}

Expected Behavior

Environment Summary

Linux-5.10.16.3-microsoft-standard-WSL2-x86_64-with-debian-bullseye-sid, Ubuntu 20.04.3 LTS
Python 3.6.10
Installer: DEB

azure-cli 2.30.0

Extensions:
azure-devops 0.20.0

[jiasli]

Moving to a new issue #20707.

[wolph]

In terms of portalocker, it seems there would be no downside if we put that truncate(0) into the retry logic?

There’s no real downside, the only “downside” I see is that it could hide these errors. This scenario should not occur so I do believe it should warrant a warning that your lock might not be valid anymore.

Once the lockfile has disappeared, your lock has disappeared as well and anyone else could lock in the mean time.