v2.77 fails with ERROR: cannot use a string pattern on a bytes-like object #32103
Description
Describe the bug
When running the following script in our Azure Devops pipeline, az-cli version 2.77 fails with the following stacktrace. Reverting back to 2.76 works.
This is similar to #32091 & #32039, but with a different stacktrace, pointing to either the same root cause but in a different location, or at least a similar issue.
Related command
az storage blob delete-batch
Errors
ERROR: The command failed with an unexpected error. Here is the traceback:
ERROR: cannot use a string pattern on a bytes-like object
Traceback (most recent call last):
File "/opt/az/lib/python3.13/site-packages/knack/cli.py", line 233, in invoke
cmd_result = self.invocation.execute(args)
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 666, in execute
raise ex
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 734, in _run_jobs_serially
results.append(self._run_job(expanded_arg, cmd_copy))
~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 726, in _run_job
return cmd_copy.exception_handler(ex)
~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^
File "/opt/az/lib/python3.13/site-packages/azure/cli/command_modules/storage/__init__.py", line 358, in new_handler
first(ex)
~~~~~^^^^
File "/opt/az/lib/python3.13/site-packages/azure/cli/command_modules/storage/__init__.py", line 357, in new_handler
raise ex
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 703, in _run_job
result = cmd_copy(params)
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 336, in __call__
return self.handler(*args, **kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/command_operation.py", line 120, in handler
return op(**command_args)
File "/opt/az/lib/python3.13/site-packages/azure/cli/command_modules/storage/operations/blob.py", line 800, in storage_blob_delete_batch
source_blobs = list(collect_blob_objects(client, source_container_name, pattern))
File "/opt/az/lib/python3.13/site-packages/azure/cli/command_modules/storage/util.py", line 52, in collect_blob_objects
if not pattern or _match_path(blob_name, pattern):
~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.13/site-packages/azure/cli/command_modules/storage/util.py", line 199, in _match_path
return fnmatch(path, pattern)
File "/opt/az/lib/python3.13/fnmatch.py", line 36, in fnmatch
return fnmatchcase(name, pat)
File "/opt/az/lib/python3.13/fnmatch.py", line 71, in fnmatchcase
return match(name) is not None
~~~~~^^^^^^
TypeError: cannot use a string pattern on a bytes-like object
Issue script & Debug output
See errors above
Expected behavior
The command to work as it did in az-cli 2.76
Environment Summary
Azure Devops (pipelines from pipeline definitions in repo)
az-cli version 2.77
[command]/usr/bin/az --version
2025-09-11T10:17:33.7493596Z azure-cli 2.77.0
2025-09-11T10:17:33.7548400Z
2025-09-11T10:17:33.7549459Z core 2.77.0
2025-09-11T10:17:33.7549901Z telemetry 1.1.0
2025-09-11T10:17:33.7550542Z
2025-09-11T10:17:33.7551496Z Extensions:
2025-09-11T10:17:33.7552175Z azure-devops 1.0.2
2025-09-11T10:17:33.7552768Z
2025-09-11T10:17:33.7553752Z Dependencies:
2025-09-11T10:17:33.7554530Z msal 1.34.0b1
2025-09-11T10:17:33.7555219Z azure-mgmt-resource 23.3.0
2025-09-11T10:17:33.7555723Z
2025-09-11T10:17:33.7556738Z Python location '/opt/az/bin/python3'
2025-09-11T10:17:33.7557557Z Config directory '/home/vsts/.azure'
2025-09-11T10:17:33.7558641Z Extensions directory '/opt/az/azcliextensions'
2025-09-11T10:17:33.7559074Z
2025-09-11T10:17:33.7560160Z Python (Linux) 3.13.7 (main, Aug 26 2025, 08:47:19) [GCC 13.3.0]
2025-09-11T10:17:33.7568851Z
2025-09-11T10:17:33.7569808Z Legal docs and information: aka.ms/AzureCliLegal
2025-09-11T10:17:33.7570225Z
2025-09-11T10:17:33.7570946Z
2025-09-11T10:17:33.7572185Z Your CLI is up-to-date.
Additional context
Workaround for now:
revert to az-cli v1.76 with the following script executed before running the az commands:
- script: |
# Install the desired version using pip
pip install azure-cli==2.76.0
# Verify the installed version
az --version
displayName: 'Install Specific Azure CLI Version'