`az containerapp up --source` crashes on macOS: `OS` is `None` causing `OS.linux.value` to fail

[lygav]

Describe the bug

az containerapp up --source . crashes during ACR build with AttributeError: 'NoneType' object has no attribute 'linux' at _utils.py:1349.

The root cause is in queue_acr_build() which resolves SDK models via:

OS, Architecture = cmd.get_models('OS', 'Architecture',
    resource_type=ResourceType.MGMT_CONTAINERREGISTRY, operation_group='runs')

cmd.get_models() calls get_versioned_sdk() which looks up the API profile for MGMT_CONTAINERREGISTRY and imports from its models module. This returns None (silently) because the OS and Architecture enums no longer exist under the runs operation group in azure-mgmt-containerregistry.

These models have moved to the separate azure-mgmt-containerregistrytasks package (see _enums.py), but queue_acr_build still resolves them from the old location.

The code then calls OS.linux.value on None and crashes.

Command

az containerapp up \
  -n my-app \
  -g my-resource-group \
  --environment my-environment \
  --location westus \
  --source .

Error

The command failed with an unexpected error. Here is the traceback:
'NoneType' object has no attribute 'linux'
Traceback (most recent call last):
  ...
  File "azure/cli/command_modules/containerapp/_utils.py", line 1349, in queue_acr_build
    platform_os = OS.linux.value
                  ^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'linux'

Environment

• Azure CLI version: 2.86.0 (upgraded from 2.84, which worked)
• OS: macOS (Apple Silicon, Homebrew install)
• Python: 3.13

Dockerfile used

FROM ubuntu:24.04
RUN apt-get update && apt-get install -y \
    strace gdb python3 libcap2-bin procps \
    && rm -rf /var/lib/apt/lists/*
CMD ["sleep", "infinity"]

[yonzhan]

Thank you for opening this issue, we will look into it.