Add private flag for disabling eager check for decommissioned functions (#8156)

* Add private flag for disabling eager check for decomissioned functions runtimes

* Formatter

Author: inlined

src/deploy/functions/prepare.ts

@@ -4,6 +4,7 @@ import * as args from "./args";
 import * as proto from "../../gcp/proto";
 import * as backend from "./backend";
 import * as build from "./build";
+import * as experiments from "../../experiments";
 import * as ensureApiEnabled from "../../ensureApiEnabled";
 import * as functionsConfig from "../../functionsConfig";
 import * as functionsEnv from "../../functions/env";
@@ -504,7 +505,9 @@ export async function loadCodebases(
     }
     const runtimeDelegate = await runtimes.getRuntimeDelegate(delegateContext);
     logger.debug(`Validating ${runtimeDelegate.language} source`);
-    supported.guardVersionSupport(runtimeDelegate.runtime);
+    if (!experiments.isEnabled("bypassfunctionsdeprecationcheck")) {
+      supported.guardVersionSupport(runtimeDelegate.runtime);
+    }
     await runtimeDelegate.validate();
     logger.debug(`Building ${runtimeDelegate.language} source`);
     await runtimeDelegate.build();

src/experiments.ts

@@ -77,6 +77,15 @@ export const ALL_EXPERIMENTS = experiments({
     shortDescription: "Use Cloud Run API to list v2 functions",
     public: false,
   },
+  bypassfunctionsdeprecationcheck: {
+    shortDescription: "Bypass Functions check for old runtimes",
+    fullDescription:
+      "Bypasses the local check for whether a functions runtime is " +
+      "decommissioned. This does not, by itself, allow you to deploy a function with a " +
+      "decommissioned runtime, as there are server-side checks as well.",
+    public: false,
+    default: false,
+  },
 
   // Emulator experiments
   emulatoruisnapshot: {