Move condition to the installer

src/installer.ts

@@ -5,7 +5,7 @@ import * as semver from 'semver';
 import * as httpm from '@actions/http-client';
 import * as sys from './system';
 import fs from 'fs';
-import os, {arch} from 'os';
+import os from 'os';
 import {StableReleaseAlias} from './utils';
 
 type InstallationType = 'dist' | 'manifest';
@@ -56,6 +56,18 @@ export async function getGo(
     }
   }
 
+  if (
+    versionSpec === StableReleaseAlias.Stable ||
+    versionSpec === StableReleaseAlias.OldStable
+  ) {
+    versionSpec = await resolveStableVersionInput(
+      versionSpec,
+      auth,
+      arch,
+      manifest
+    );
+  }
+
   // check cache
   let toolPath: string;
   toolPath = tc.find('go', versionSpec, arch);

src/main.ts

@@ -8,7 +8,7 @@ import {isCacheFeatureAvailable} from './cache-utils';
 import cp from 'child_process';
 import fs from 'fs';
 import os from 'os';
-import {StableReleaseAlias} from './utils';
+import {IS_WINDOWS} from './utils';
 
 export async function run() {
   try {
@@ -35,18 +35,6 @@ export async function run() {
 
       const checkLatest = core.getBooleanInput('check-latest');
 
-      if (
-        versionSpec === StableReleaseAlias.Stable ||
-        versionSpec === StableReleaseAlias.OldStable
-      ) {
-        versionSpec = await installer.resolveStableVersionInput(
-          versionSpec,
-          auth,
-          arch,
-          manifest
-        );
-      }
-
       const installDir = await installer.getGo(
         versionSpec,
         checkLatest,
@@ -55,6 +43,12 @@ export async function run() {
         manifest
       );
 
+      if (IS_WINDOWS) {
+        versionSpec = installDir.split('\\').reverse()[1];
+      } else {
+        versionSpec = installDir.split('/').reverse()[1];
+      }
+
       core.addPath(path.join(installDir, 'bin'));
       core.info('Added go to the path');
 

src/utils.ts

@@ -2,3 +2,5 @@ export enum StableReleaseAlias {
   Stable = 'stable',
   OldStable = 'oldstable'
 }
+
+export const IS_WINDOWS = process.platform === 'win32';