piping output to other programs ('less' here) causes a "broken pipe" error

[cadeavil-msft]

This is autogenerated. Please review and update as needed.

Describe the bug

Command Name az vm boot-diagnostics get-boot-log

Errors:

The command failed with an unexpected error. Here is the traceback:
[Errno 32] Broken pipe
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/vm/custom.py", line 1645, in get_boot_log
    storage_client.get_blob_to_stream(container, blob, BootLogStreamWriter(sys.stdout), max_connections=1)
  File "/opt/az/lib/python3.6/site-packages/azure/multiapi/storage/v2018_11_09/blob/baseblobservice.py", line 2166, in get_blob_to_stream
    stream.write(blob.content)
  File "/opt/az/lib/python3.6/site-packages/azure/cli/command_modules/vm/custom.py", line 1579, in write
    self.out.write(content)
BrokenPipeError: [Errno 32] Broken pipe

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 vm boot-diagnostics get-boot-log -n {} | less
• the first screenfull of the serial console will be displayed.
• Now quit less WITHOUT going to end-of-log.
• broken pipe

Expected Behavior

closing the pipe by ending the program should not result in a backtrace.

Environment Summary

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

azure-cli 2.27.1

Extensions:
vm-repair 0.3.6
ssh 0.1.5

Additional Context

[yonzhan]

Compute