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[MySQL] fix resolve api version in vnet or subnet existence check#33446

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[MySQL] fix resolve api version in vnet or subnet existence check#33446
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@ramnov ramnov commented May 26, 2026

Related command

az mysql flexible-server replica create
az mysql flexible-server create
az mysql flexible-server update

any path that resolves a --subnet / --vnet / --private-dns-zone)

Description
In regions where the Microsoft.Network/virtualNetworks RP has not yet rolled out its newest API version (e.g. UAE North, where the RP tops out at 2025-07-01 while the global newest is 2025-09-01), az mysql flexible-server commands that take an existing subnet fail with:

ERROR: Invalid Vnet. The vnet id of the subnet id your provided was not found.

Root cause: _resolve_api_version in mysql/_util.py picked the first non-preview entry from provider.resource_types[].api_versions, i.e. the RP's globally-newest version. ARM rolls API versions out per region, so the picked version is not yet enabled in UAE North. ARM returns 400 NoRegisteredProviderFound; the existence check treats that as "not found" and aborts with the misleading Invalid Vnet message.

Fix: prefer the RP-declared default_api_version (pinned by the RP to a broadly-supported stable version available in every region), and fall back to the previous api_versions[0] logic only when no default is declared. This matches the pattern already used by PostgreSQL flexible-server (postgresql/utils/_flexible_server_util.py::_resolve_api_version).

Effect: VNet/subnet/private-DNS-zone existence probes now succeed in regions like UAE North; no behavior change for regions/RPs that already work (they fall through to the existing logic).

Testing Guide

az mysql flexible-server replica create \
  --replica-name <replica-name> \
  --source-server <source-server> \
  --resource-group <rg> \
  --subscription <sub-id> \
  --location "UAE North" \
  --subnet /subscriptions/<sub-id>/resourceGroups/<rg>/providers/Microsoft.Network/virtualNetworks/<vnet>/subnets/<subnet> \
  --private-dns-zone /subscriptions/<sub-id>/resourceGroups/<rg>/providers/Microsoft.Network/privateDnsZones/<zone>.private.mysql.database.azure.com

History Notes


This checklist is used to make sure that common guidelines for a pull request are followed.

@ramnov ramnov requested review from Pan-Qi and VeryEarly as code owners May 26, 2026 20:23
Copilot AI review requested due to automatic review settings May 26, 2026 20:23
@ramnov ramnov requested review from calvinhzy and jsntcy as code owners May 26, 2026 20:23
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azure-client-tools-bot-prd Bot commented May 26, 2026

️✔️AzureCLI-BreakingChangeTest
️✔️Non Breaking Changes

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Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Updates MySQL command module API-version resolution to prefer the provider’s default_api_version when available for an unambiguous resource type.

Changes:

  • Return default_api_version when exactly one matching resource type is found and it provides a non-empty default.
  • Preserve existing fallback behavior that prefers non-preview versions from api_versions.

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Comment on lines +367 to 371
if len(rt) == 1 and rt[0].default_api_version not in (None, ''):
return rt[0].default_api_version
if len(rt) == 1 and rt[0].api_versions:
npv = [v for v in rt[0].api_versions if 'preview' not in v.lower()]
return npv[0] if npv else rt[0].api_versions[0]
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yonzhan commented May 26, 2026

Thank you for your contribution! We will review the pull request and get back to you soon.

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The git hooks are available for azure-cli and azure-cli-extensions repos. They could help you run required checks before creating the PR.

Please sync the latest code with latest dev branch (for azure-cli) or main branch (for azure-cli-extensions).
After that please run the following commands to enable git hooks:

pip install azdev --upgrade
azdev setup -c <your azure-cli repo path> -r <your azure-cli-extensions repo path>

@yonzhan yonzhan assigned calvinhzy and unassigned calvinhzy May 26, 2026
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