Implement dotnet-version output

action.yml

@@ -17,6 +17,9 @@ inputs:
     description: 'Optional OWNER for using packages from GitHub Package Registry organizations/users other than the current repository''s owner. Only used if a GPR URL is also provided in source-url'
   config-file:
     description: 'Optional NuGet.config location, if your NuGet.config isn''t located in the root of the repo.'
+outputs:
+  dotnet-version:
+    description: 'Contains the installed by action .NET SDK version for reuse.'
 runs:
   using: 'node16'
   main: 'dist/index.js'

dist/index.js

@@ -356,8 +356,25 @@ class DotnetCoreInstaller {
             if (exitCode) {
                 throw new Error(`Failed to install dotnet ${exitCode}. ${stdout}`);
             }
+            return this.outputDotnetVersion(stdout);
         });
     }
+    outputDotnetVersion(logs) {
+        let resolvedVersion = '';
+        const installedByScriptPattern = /Installed version is (?<version>\d+\.\d+\.\d.*)$/m;
+        const preinstalledOnRunnerPattern = /.NET Core SDK with version '(?<version>\d+\.\d+\.\d.*)'/m;
+        let regExpressions = [
+            installedByScriptPattern,
+            preinstalledOnRunnerPattern
+        ];
+        for (let regExp of regExpressions) {
+            if (regExp.test(logs)) {
+                resolvedVersion = logs.match(regExp).groups.version;
+                break;
+            }
+        }
+        return resolvedVersion;
+    }
 }
 exports.DotnetCoreInstaller = DotnetCoreInstaller;
 DotnetCoreInstaller.installationDirectoryWindows = path_1.default.join(process.env['PROGRAMFILES'] + '', 'dotnet');
@@ -408,6 +425,7 @@ const core = __importStar(__nccwpck_require__(2186));
 const installer_1 = __nccwpck_require__(1480);
 const fs = __importStar(__nccwpck_require__(7147));
 const path_1 = __importDefault(__nccwpck_require__(1017));
+const semver_1 = __importDefault(__nccwpck_require__(5911));
 const auth = __importStar(__nccwpck_require__(8527));
 const qualityOptions = [
     'daily',
@@ -429,6 +447,7 @@ function run() {
             // Proxy, auth, (etc) are still set up, even if no version is identified
             //
             const versions = core.getMultilineInput('dotnet-version');
+            let installedDotnetVersions = [];
             const globalJsonFileInput = core.getInput('global-json-file');
             if (globalJsonFileInput) {
                 const globalJsonPath = path_1.default.join(process.cwd(), globalJsonFileInput);
@@ -454,7 +473,8 @@ function run() {
                 const uniqueVersions = new Set(versions);
                 for (const version of uniqueVersions) {
                     dotnetInstaller = new installer_1.DotnetCoreInstaller(version, quality);
-                    yield dotnetInstaller.installDotnet();
+                    let installedVersion = yield dotnetInstaller.installDotnet();
+                    installedDotnetVersions.push(installedVersion);
                 }
                 installer_1.DotnetCoreInstaller.addToPath();
             }
@@ -463,6 +483,9 @@ function run() {
             if (sourceUrl) {
                 auth.configAuthentication(sourceUrl, configFile);
             }
+            core.setOutput('dotnet-version', semver_1.default.maxSatisfying(installedDotnetVersions, '*', {
+                includePrerelease: true
+            }));
             const matchersPath = path_1.default.join(__dirname, '..', '.github');
             core.info(`##[add-matcher]${path_1.default.join(matchersPath, 'csc.json')}`);
         }

src/installer.ts

@@ -238,5 +238,27 @@ export class DotnetCoreInstaller {
     if (exitCode) {
       throw new Error(`Failed to install dotnet ${exitCode}. ${stdout}`);
     }
+
+    return this.outputDotnetVersion(stdout);
+  }
+
+  private outputDotnetVersion(logs: string): string {
+    let resolvedVersion: string = '';
+    const installedByScriptPattern = /Installed version is (?<version>\d+\.\d+\.\d.*)$/m;
+    const preinstalledOnRunnerPattern = /.NET Core SDK with version '(?<version>\d+\.\d+\.\d.*)'/m;
+
+    let regExpressions: RegExp[] = [
+      installedByScriptPattern,
+      preinstalledOnRunnerPattern
+    ];
+
+    for (let regExp of regExpressions) {
+      if (regExp.test(logs)) {
+        resolvedVersion = logs.match(regExp)!.groups!.version;
+        break;
+      }
+    }
+
+    return resolvedVersion;
   }
 }

src/setup-dotnet.ts

@@ -2,6 +2,7 @@ import * as core from '@actions/core';
 import {DotnetCoreInstaller} from './installer';
 import * as fs from 'fs';
 import path from 'path';
+import semver from 'semver';
 import * as auth from './authutil';
 
 const qualityOptions = [
@@ -26,6 +27,7 @@ export async function run() {
     // Proxy, auth, (etc) are still set up, even if no version is identified
     //
     const versions = core.getMultilineInput('dotnet-version');
+    let installedDotnetVersions: string[] = [];
 
     const globalJsonFileInput = core.getInput('global-json-file');
     if (globalJsonFileInput) {
@@ -60,7 +62,8 @@ export async function run() {
       const uniqueVersions = new Set<string>(versions);
       for (const version of uniqueVersions) {
         dotnetInstaller = new DotnetCoreInstaller(version, quality);
-        await dotnetInstaller.installDotnet();
+        let installedVersion = await dotnetInstaller.installDotnet();
+        installedDotnetVersions.push(installedVersion);
       }
       DotnetCoreInstaller.addToPath();
     }
@@ -71,6 +74,13 @@ export async function run() {
       auth.configAuthentication(sourceUrl, configFile);
     }
 
+    core.setOutput(
+      'dotnet-version',
+      semver.maxSatisfying(installedDotnetVersions, '*', {
+        includePrerelease: true
+      })
+    );
+
     const matchersPath = path.join(__dirname, '..', '.github');
     core.info(`##[add-matcher]${path.join(matchersPath, 'csc.json')}`);
   } catch (error) {