Fallback to global.json if no version specified

lib/setup-dotnet.js

@@ -17,6 +17,7 @@ var __importStar = (this && this.__importStar) || function (mod) {
 Object.defineProperty(exports, "__esModule", { value: true });
 const core = __importStar(require("@actions/core"));
 const installer = __importStar(require("./installer"));
+const fs = __importStar(require("fs"));
 const path = __importStar(require("path"));
 function run() {
     return __awaiter(this, void 0, void 0, function* () {
@@ -25,7 +26,17 @@ function run() {
             // Version is optional.  If supplied, install / use from the tool cache
             // If not supplied then task is still used to setup proxy, auth, etc...
             //
-            const version = core.getInput('version');
+            let version = core.getInput('version');
+            if (!version) {
+                // Try to fall back to global.json
+                const globalJsonPath = path.join(process.cwd(), 'global.json');
+                if (fs.existsSync(globalJsonPath)) {
+                    const globalJson = JSON.parse(fs.readFileSync(globalJsonPath, { encoding: 'utf8' }));
+                    if (globalJson.sdk && globalJson.sdk.version) {
+                        version = globalJson.sdk.version;
+                    }
+                }
+            }
             if (version) {
                 const dotnetInstaller = new installer.DotnetCoreInstaller(version);
                 yield dotnetInstaller.installDotnet();

src/setup-dotnet.ts

@@ -1,5 +1,6 @@
 import * as core from '@actions/core';
 import * as installer from './installer';
+import * as fs from 'fs';
 import * as path from 'path';
 
 async function run() {
@@ -8,7 +9,20 @@ async function run() {
     // Version is optional.  If supplied, install / use from the tool cache
     // If not supplied then task is still used to setup proxy, auth, etc...
     //
-    const version = core.getInput('version');
+    let version = core.getInput('version');
+    if (!version) {
+      // Try to fall back to global.json
+      const globalJsonPath = path.join(process.cwd(), 'global.json');
+      if (fs.existsSync(globalJsonPath)) {
+        const globalJson = JSON.parse(
+          fs.readFileSync(globalJsonPath, {encoding: 'utf8'})
+        );
+        if (globalJson.sdk && globalJson.sdk.version) {
+          version = globalJson.sdk.version;
+        }
+      }
+    }
+
     if (version) {
       const dotnetInstaller = new installer.DotnetCoreInstaller(version);
       await dotnetInstaller.installDotnet();