Add add-to-path input to control whether the toolchain is added to the PATH

.github/workflows/test.yml

@@ -42,6 +42,27 @@ jobs:
     - uses: actions/checkout@v3
     - uses: ./
     - run: swift --version
+  test-skip-add-to-path:
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@v3
+    - uses: ./
+      id: setup
+      with:
+        add-to-path: false
+    - name: Ensure that the toolchain is not added to the PATH
+      shell: node {0}
+      run: |
+        const path = require('path');
+        const toolchainPath = path.join(process.env.TOOLCHAIN_PATH, 'usr', 'bin');
+        const pathEnv = process.env.PATH;
+        console.log(`Checking if ${toolchainPath} is in the PATH (${pathEnv})`);
+        const pathCandidates = pathEnv.split(path.delimiter);
+        if (pathCandidates.includes(toolchainPath)) {
+          throw new Error(`Toolchain path ${toolchainPath} is in the PATH`);
+        }
+      env:
+        TOOLCHAIN_PATH: ${{ steps.setup.outputs.toolchain-path }}
   test-nightly:
     runs-on: ubuntu-20.04
     steps:

action.yml

@@ -6,6 +6,9 @@ branding:
 inputs:
   swift-version:
     description: 'Swift version to configure. Reads from .swift-version if unset. Use default value if both are absent.'
+  add-to-path:
+    description: 'Add the toolchain to the PATH'
+    default: 'true'
 runs:
   using: 'node16'
   main: 'dist/index.js'

index.js

@@ -13,7 +13,9 @@ async function run(version) {
   core.debug(`Resolved toolchain download URL: ${url}`);
   const toolchainPath = await installToolchain(url, version, platform);
   core.info(`Toolchain installed at ${toolchainPath}`);
-  core.addPath(`${toolchainPath}/usr/bin`);
+  if (core.getBooleanInput("add-to-path")) {
+    core.addPath(`${toolchainPath}/usr/bin`);
+  }
   core.setOutput("toolchain-path", toolchainPath);
 }
 

nightly/action.yml

@@ -7,6 +7,9 @@ inputs:
   token:
     description: Personal access token (PAT) used to fetch releases.
     default: ${{ github.token }}
+  add-to-path:
+    description: 'Add the toolchain to the PATH'
+    default: 'true'
 runs:
   using: 'node16'
   main: '../dist/nightly/index.js'