[App Service] Fix az functionapp config appsettings set: normalize runtime version suffix

Replaces the hand-maintained old_to_new_version map in _FunctionAppStackRuntimeHelper.resolve with three generic numeric normalization rules that bridge bare-integer and X.0 forms in both directions, plus the legacy Java 1.8 -> 8.0 case. Each candidate is only accepted if it exists in the API-returned runtime list, so genuinely invalid versions still raise the existing 'Invalid version' error.

Fixes the misleading 'Invalid version: 21 for runtime java' warning emitted when running az functionapp config appsettings set on Linux Java 21/25 apps. Same false positive could be reproduced on .NET-isolated apps when the persisted version was stored as 8.0 instead of 8.

Author: ahmedmuhsin

src/azure-cli/HISTORY.rst

@@ -41,6 +41,7 @@ Release History
 * `az webapp create`: Add error message that clearly lists all valid options and specifies how to discover available runtimes (#33252)
 * `az appservice plan create`: Make `P0V3` as default SKU when `--sku` is omitted for linux webapp (#33237)
 * `az appservice plan create`: Add `PREMIUM0V3` tier for elastic scale (#33237)
+* Fix #33379: `az functionapp config appsettings set`: Stop emitting a misleading "Invalid version" warning for Java/.NET runtime versions stored without a matching decimal suffix (e.g. `Java|21` vs API `21.0`, or `8.0` vs API `8`); normalize between the two forms instead of using a hardcoded version map
 
 **Cloud**
 

src/azure-cli/azure/cli/command_modules/appservice/custom.py

@@ -8061,20 +8061,29 @@ def resolve(self, runtime, version=None, functions_version=None, is_linux=False,
             return matched_runtime_version
         matched_runtime_version = next((r for r in runtimes if r.version == version), None)
         if not matched_runtime_version:
-            # help convert previously acceptable versions into correct ones if match not found
-            old_to_new_version = {
-                "11": "11.0",
-                "8": "8.0",
-                "8.0": "8",
-                "7": "7.0",
-                "6.0": "6",
-                "1.8": "8.0",
-                "17": "17.0"
-            }
-            new_version = old_to_new_version.get(version)
-            matched_runtime_version = next((r for r in runtimes if r.version == new_version), None)
-            if matched_runtime_version is not None:
-                version = new_version
+            # The runtime stacks API and the value persisted on a site can disagree on the
+            # decimal-suffix convention (e.g. API returns "21.0" while linux_fx_version stores
+            # "Java|21"; .NET-isolated returns "8" while a Bicep template stored "8.0"). To
+            # avoid emitting a misleading "Invalid version" warning, derive a small set of
+            # candidate alternatives and accept any that actually exists in the API-returned
+            # runtimes list. This stays self-healing as new major versions ship.
+            candidate_versions = []
+            if version == "1.8":
+                # Legacy Java naming retained for backwards compatibility.
+                candidate_versions.append("8.0")
+            elif version.isdigit():
+                # Bare integer ("21") -> decimal form ("21.0").
+                candidate_versions.append("{}.0".format(version))
+            elif re.fullmatch(r"\d+\.0", version):
+                # Decimal form ("8.0") -> bare integer ("8").
+                candidate_versions.append(version[:-2])
+
+            for candidate in candidate_versions:
+                alt_match = next((r for r in runtimes if r.version == candidate), None)
+                if alt_match is not None:
+                    matched_runtime_version = alt_match
+                    version = candidate
+                    break
 
         self.validate_end_of_life_date(
             runtime,

src/azure-cli/azure/cli/command_modules/appservice/tests/latest/test_functionapp_commands_thru_mock.py

@@ -17,9 +17,10 @@
     remove_remote_build_app_settings,
     config_source_control,
     validate_app_settings_in_scm,
-    update_container_settings_functionapp)
+    update_container_settings_functionapp,
+    _FunctionAppStackRuntimeHelper)
 from azure.cli.core.profiles import ResourceType
-from azure.cli.core.azclierror import (AzureInternalError, UnclassifiedUserFault)
+from azure.cli.core.azclierror import (AzureInternalError, UnclassifiedUserFault, ValidationError)
 from azure.cli.core.azclierror import ResourceNotFoundError
 
 TEST_DIR = os.path.abspath(os.path.join(os.path.abspath(__file__), '..'))
@@ -849,3 +850,154 @@ def test_flex_parse_raw_stacks_prefers_functions_worker_runtime_when_present(sel
 
         # assert
         self.assertEqual(matched.name, 'dotnet-isolated')
+
+
+def _make_runtime(name, version, linux=True, supported_func_versions=None):
+    """Build a minimal _FunctionAppStackRuntimeHelper.Runtime for resolve() tests."""
+    return _FunctionAppStackRuntimeHelper.Runtime(
+        name=name,
+        version=version,
+        linux=linux,
+        supported_func_versions=supported_func_versions or ["~4"],
+    )
+
+
+class TestFunctionAppStackRuntimeHelperResolve(unittest.TestCase):
+    """Tests for _FunctionAppStackRuntimeHelper.resolve() version normalization.
+
+    The Functions Stacks API and the value persisted on a site can disagree on the
+    decimal-suffix convention (e.g. API returns "21.0" while linux_fx_version stores
+    "Java|21"; .NET-isolated returns "8" while Bicep/portal stored "8.0"). resolve()
+    normalizes between these forms instead of using a hand-maintained mapping that
+    needs a code change for every new major version.
+    """
+
+    def _build_helper(self, stacks):
+        with mock.patch('azure.cli.command_modules.appservice.custom.web_client_factory'):
+            helper = _FunctionAppStackRuntimeHelper(_get_test_cmd(), linux=True, windows=False)
+        # Pre-populate stacks so _load_stacks() short-circuits and no API call is made.
+        helper._stacks = stacks
+        return helper
+
+    # -- bare integer ("21") matches API decimal form ("21.0") ---------------
+
+    def test_resolve_java_bare_int_matches_decimal_form(self):
+        """Repro: az functionapp config appsettings set on a Linux Java 21 app
+        emitted a misleading 'Invalid version: 21' warning because linux_fx_version
+        stores 'Java|21' but the API returns version '21.0'."""
+        stacks = [
+            _make_runtime("java", "25.0"),
+            _make_runtime("java", "21.0"),
+            _make_runtime("java", "17.0"),
+            _make_runtime("java", "11.0"),
+            _make_runtime("java", "8.0"),
+        ]
+        helper = self._build_helper(stacks)
+
+        result = helper.resolve("java", "21", functions_version="~4", is_linux=True)
+
+        self.assertIsNotNone(result)
+        self.assertEqual(result.version, "21.0")
+
+    def test_resolve_java_25_bare_int_matches_decimal_form(self):
+        """Future-proofing: the fix must handle Java majors that did not exist
+        when this code was written, without a code change."""
+        stacks = [
+            _make_runtime("java", "25.0"),
+            _make_runtime("java", "21.0"),
+        ]
+        helper = self._build_helper(stacks)
+
+        result = helper.resolve("java", "25", functions_version="~4", is_linux=True)
+
+        self.assertIsNotNone(result)
+        self.assertEqual(result.version, "25.0")
+
+    # -- decimal form ("8.0") matches API bare integer ("8") -----------------
+
+    def test_resolve_dotnet_isolated_decimal_matches_bare_int(self):
+        """.NET-isolated runtime versions appear in the Stacks API as bare
+        integers ('8'), but Bicep/portal-provisioned apps sometimes store '8.0'.
+        Normalization must work in both directions."""
+        stacks = [
+            _make_runtime("dotnet-isolated", "8"),
+            _make_runtime("dotnet-isolated", "9"),
+        ]
+        helper = self._build_helper(stacks)
+
+        result = helper.resolve("dotnet-isolated", "8.0", functions_version="~4", is_linux=True)
+
+        self.assertIsNotNone(result)
+        self.assertEqual(result.version, "8")
+
+    # -- legacy Java naming --------------------------------------------------
+
+    def test_resolve_java_1_8_matches_8_0(self):
+        """Legacy Java naming '1.8' should still resolve to the API's '8.0'."""
+        stacks = [
+            _make_runtime("java", "8.0"),
+            _make_runtime("java", "11.0"),
+        ]
+        helper = self._build_helper(stacks)
+
+        result = helper.resolve("java", "1.8", functions_version="~4", is_linux=True)
+
+        self.assertIsNotNone(result)
+        self.assertEqual(result.version, "8.0")
+
+    # -- direct match (already-canonical input) ------------------------------
+
+    def test_resolve_exact_version_match_unchanged(self):
+        """If the input already matches the API value verbatim, normalization
+        must not run and the Runtime should be returned as-is."""
+        stacks = [
+            _make_runtime("java", "21.0"),
+        ]
+        helper = self._build_helper(stacks)
+
+        result = helper.resolve("java", "21.0", functions_version="~4", is_linux=True)
+
+        self.assertIsNotNone(result)
+        self.assertEqual(result.version, "21.0")
+
+    # -- genuinely invalid versions still error ------------------------------
+
+    def test_resolve_unknown_major_version_still_raises(self):
+        """An unknown bare-integer major must NOT be silently accepted just
+        because rule 1 generates a candidate. The candidate is only used if it
+        actually exists in the API-returned runtime list."""
+        stacks = [
+            _make_runtime("java", "21.0"),
+            _make_runtime("java", "17.0"),
+        ]
+        helper = self._build_helper(stacks)
+
+        with self.assertRaises(ValidationError) as ctx:
+            helper.resolve("java", "99", functions_version="~4", is_linux=True)
+        self.assertIn("Invalid version: 99", str(ctx.exception))
+
+    def test_resolve_unknown_minor_version_still_raises(self):
+        """Versions that don't fit any normalization rule (e.g. '21.5') must
+        fall through to the existing 'Invalid version' error."""
+        stacks = [
+            _make_runtime("java", "21.0"),
+        ]
+        helper = self._build_helper(stacks)
+
+        with self.assertRaises(ValidationError) as ctx:
+            helper.resolve("java", "21.5", functions_version="~4", is_linux=True)
+        self.assertIn("Invalid version: 21.5", str(ctx.exception))
+
+    def test_resolve_disable_version_error_returns_none(self):
+        """disable_version_error=True must continue to suppress the ValidationError
+        for unknown versions (existing behavior preserved)."""
+        stacks = [
+            _make_runtime("java", "21.0"),
+        ]
+        helper = self._build_helper(stacks)
+
+        result = helper.resolve(
+            "java", "99", functions_version="~4",
+            is_linux=True, disable_version_error=True)
+
+        self.assertIsNone(result)