feature: add `update-environment` input (#411)

This option allows to specify if the action shall update environment variables (default) or not.
This allows to use the setup-python action in a composite action without side effect (except downloading/installing python if version is missing).

.github/workflows/test-pypy.yml

@@ -65,3 +65,29 @@ jobs:
           EXECUTABLE=${EXECUTABLE%%-*}  # remove any -* suffixe
           ${EXECUTABLE} --version
         shell: bash
+
+  setup-pypy-noenv:
+    name: Setup PyPy ${{ matrix.pypy }} ${{ matrix.os }} (noenv)
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, windows-latest, ubuntu-18.04, ubuntu-latest]
+        pypy: ['pypy2.7', 'pypy3.7', 'pypy3.8', 'pypy3.9-nightly']
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: setup-python ${{ matrix.pypy }}
+        id: setup-python
+        uses: ./
+        with:
+          python-version: ${{ matrix.pypy }}
+          update-environment: false
+
+      - name: PyPy and Python version
+        run: ${{ steps.setup-python.outputs.python-path }} --version
+
+      - name: Run simple code
+        run: ${{ steps.setup-python.outputs.python-path }} -c 'import math; print(math.factorial(5))'

.github/workflows/test-python.yml

@@ -147,3 +147,28 @@ jobs:
 
     - name: Run simple code
       run: python -c 'import math; print(math.factorial(5))'
+
+  setup-versions-noenv:
+    name: Setup ${{ matrix.python }} ${{ matrix.os }} (noenv)
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, windows-latest, ubuntu-18.04, ubuntu-20.04]
+        python: ["3.7", "3.8", "3.9", "3.10"]
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+
+    - name: setup-python ${{ matrix.python }}
+      id: setup-python
+      uses: ./
+      with:
+        python-version: ${{ matrix.python }}
+        update-environment: false
+
+    - name: Python version
+      run: ${{ steps.setup-python.outputs.python-path }} --version
+
+    - name: Run simple code
+      run: ${{ steps.setup-python.outputs.python-path }} -c 'import math; print(math.factorial(5))'

.licenses/npm/@actions/core.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/core"
-version: 1.2.6
+version: 1.7.0
 type: npm
 summary: Actions core lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/core

.licenses/npm/@actions/http-client-1.0.8.dep.yml

@@ -1,32 +0,0 @@
----
-name: "@actions/http-client"
-version: 1.0.8
-type: npm
-summary: Actions Http Client
-homepage: https://github.com/actions/http-client#readme
-license: mit
-licenses:
-- sources: LICENSE
-  text: |
-    Actions Http Client for Node.js
-
-    Copyright (c) GitHub, Inc.
-
-    All rights reserved.
-
-    MIT License
-
-    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
-    associated documentation files (the "Software"), to deal in the Software without restriction,
-    including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
-    and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
-    subject to the following conditions:
-
-    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-
-    THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
-    LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-    NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
-    WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-notices: []

README.md

@@ -320,6 +320,26 @@ steps:
 - run: pipenv install
 ```
 
+# Environment variables
+
+ The `update-environment` flag defaults to `true`.
+ With this setting, the action will add/update environment variables (e.g. `PATH`, `PKG_CONFIG_PATH`, `pythonLocation`) for `python` to just work out of the box.
+
+ If `update-environment` is set to `false`, the action will not add/update environment variables.
+ This can prove useful if you want the only side-effect to be to ensure python is installed and rely on the `python-path` output to run python.
+ Such a requirement on side-effect could be because you don't want your composite action messing with your user's workflows.
+
+ ```yaml
+ steps:
+   - uses: actions/checkout@v3
+   - uses: actions/setup-python@v4
+     id: cp310
+     with:
+       python-version: '3.10'
+       update-environment: false
+   - run: ${{ steps.cp310.outputs.python-path }} my_script.py
+ ```
+
 # Using `setup-python` with a self hosted runner
 
 Python distributions are only available for the same [environments](https://github.com/actions/virtual-environments#available-environments) that GitHub Actions hosted environments are available for. If you are using an unsupported version of Ubuntu such as `19.04` or another Linux distribution such as Fedora, `setup-python` will not work. If you have a supported self-hosted runner and you would like to use `setup-python`, there are a few extra things you need to make sure are set up so that new versions of Python can be downloaded and configured on your runner.

__tests__/find-pypy.test.ts

@@ -5,6 +5,7 @@ import {HttpClient} from '@actions/http-client';
 import * as ifm from '@actions/http-client/interfaces';
 import * as tc from '@actions/tool-cache';
 import * as exec from '@actions/exec';
+import * as core from '@actions/core';
 
 import * as path from 'path';
 import * as semver from 'semver';
@@ -148,6 +149,8 @@ describe('findPyPyVersion', () => {
   let spyWriteExactPyPyVersionFile: jest.SpyInstance;
   let spyCacheDir: jest.SpyInstance;
   let spyChmodSync: jest.SpyInstance;
+  let spyCoreAddPath: jest.SpyInstance;
+  let spyCoreExportVariable: jest.SpyInstance;
 
   beforeEach(() => {
     tcFind = jest.spyOn(tc, 'find');
@@ -201,6 +204,10 @@ describe('findPyPyVersion', () => {
 
     spyExistsSync = jest.spyOn(fs, 'existsSync');
     spyExistsSync.mockReturnValue(true);
+
+    spyCoreAddPath = jest.spyOn(core, 'addPath');
+
+    spyCoreExportVariable = jest.spyOn(core, 'exportVariable');
   });
 
   afterEach(() => {
@@ -211,22 +218,31 @@ describe('findPyPyVersion', () => {
 
   it('found PyPy in toolcache', async () => {
     await expect(
-      finder.findPyPyVersion('pypy-3.6-v7.3.x', architecture)
+      finder.findPyPyVersion('pypy-3.6-v7.3.x', architecture, true)
     ).resolves.toEqual({
       resolvedPythonVersion: '3.6.12',
       resolvedPyPyVersion: '7.3.3'
     });
+    expect(spyCoreAddPath).toHaveBeenCalled();
+    expect(spyCoreExportVariable).toHaveBeenCalledWith(
+      'pythonLocation',
+      expect.anything()
+    );
+    expect(spyCoreExportVariable).toHaveBeenCalledWith(
+      'PKG_CONFIG_PATH',
+      expect.anything()
+    );
   });
 
   it('throw on invalid input format', async () => {
     await expect(
-      finder.findPyPyVersion('pypy3.7-v7.3.x', architecture)
+      finder.findPyPyVersion('pypy3.7-v7.3.x', architecture, true)
     ).rejects.toThrow();
   });
 
   it('throw on invalid input format pypy3.7-7.3.x', async () => {
     await expect(
-      finder.findPyPyVersion('pypy3.7-v7.3.x', architecture)
+      finder.findPyPyVersion('pypy3.7-v7.3.x', architecture, true)
     ).rejects.toThrow();
   });
 
@@ -238,16 +254,42 @@ describe('findPyPyVersion', () => {
     spyChmodSync = jest.spyOn(fs, 'chmodSync');
     spyChmodSync.mockImplementation(() => undefined);
     await expect(
-      finder.findPyPyVersion('pypy-3.7-v7.3.x', architecture)
+      finder.findPyPyVersion('pypy-3.7-v7.3.x', architecture, true)
     ).resolves.toEqual({
       resolvedPythonVersion: '3.7.9',
       resolvedPyPyVersion: '7.3.3'
     });
+    expect(spyCoreAddPath).toHaveBeenCalled();
+    expect(spyCoreExportVariable).toHaveBeenCalledWith(
+      'pythonLocation',
+      expect.anything()
+    );
+    expect(spyCoreExportVariable).toHaveBeenCalledWith(
+      'PKG_CONFIG_PATH',
+      expect.anything()
+    );
+  });
+
+  it('found and install successfully without environment update', async () => {
+    spyCacheDir = jest.spyOn(tc, 'cacheDir');
+    spyCacheDir.mockImplementation(() =>
+      path.join(toolDir, 'PyPy', '3.7.7', architecture)
+    );
+    spyChmodSync = jest.spyOn(fs, 'chmodSync');
+    spyChmodSync.mockImplementation(() => undefined);
+    await expect(
+      finder.findPyPyVersion('pypy-3.7-v7.3.x', architecture, false)
+    ).resolves.toEqual({
+      resolvedPythonVersion: '3.7.9',
+      resolvedPyPyVersion: '7.3.3'
+    });
+    expect(spyCoreAddPath).not.toHaveBeenCalled();
+    expect(spyCoreExportVariable).not.toHaveBeenCalled();
   });
 
   it('throw if release is not found', async () => {
     await expect(
-      finder.findPyPyVersion('pypy-3.7-v7.5.x', architecture)
+      finder.findPyPyVersion('pypy-3.7-v7.5.x', architecture, true)
     ).rejects.toThrowError(
       `PyPy version 3.7 (v7.5.x) with arch ${architecture} not found`
     );

__tests__/finder.test.ts

@@ -19,15 +19,26 @@ process.env['RUNNER_TOOL_CACHE'] = toolDir;
 process.env['RUNNER_TEMP'] = tempDir;
 
 import * as tc from '@actions/tool-cache';
+import * as core from '@actions/core';
 import * as finder from '../src/find-python';
 import * as installer from '../src/install-python';
 
 const manifestData = require('./data/versions-manifest.json');
 
 describe('Finder tests', () => {
+  let spyCoreAddPath: jest.SpyInstance;
+  let spyCoreExportVariable: jest.SpyInstance;
+
+  beforeEach(() => {
+    spyCoreAddPath = jest.spyOn(core, 'addPath');
+
+    spyCoreExportVariable = jest.spyOn(core, 'exportVariable');
+  });
+
   afterEach(() => {
     jest.resetAllMocks();
     jest.clearAllMocks();
+    jest.restoreAllMocks();
   });
 
   it('Finds Python if it is installed', async () => {
@@ -35,7 +46,27 @@ describe('Finder tests', () => {
     await io.mkdirP(pythonDir);
     fs.writeFileSync(`${pythonDir}.complete`, 'hello');
     // This will throw if it doesn't find it in the cache and in the manifest (because no such version exists)
-    await finder.useCpythonVersion('3.x', 'x64');
+    await finder.useCpythonVersion('3.x', 'x64', true);
+    expect(spyCoreAddPath).toHaveBeenCalled();
+    expect(spyCoreExportVariable).toHaveBeenCalledWith(
+      'pythonLocation',
+      expect.anything()
+    );
+    expect(spyCoreExportVariable).toHaveBeenCalledWith(
+      'PKG_CONFIG_PATH',
+      expect.anything()
+    );
+  });
+
+  it('Finds Python if it is installed without environment update', async () => {
+    const pythonDir: string = path.join(toolDir, 'Python', '3.0.0', 'x64');
+    await io.mkdirP(pythonDir);
+    fs.writeFileSync(`${pythonDir}.complete`, 'hello');
+    // This will throw if it doesn't find it in the cache and in the manifest (because no such version exists)
+    await finder.useCpythonVersion('3.x', 'x64', false);
+    expect(spyCoreAddPath).not.toHaveBeenCalled();
+    expect(spyCoreExportVariable).not.toHaveBeenCalled();
+    expect(spyCoreExportVariable).not.toHaveBeenCalled();
   });
 
   it('Finds stable Python version if it is not installed, but exists in the manifest', async () => {
@@ -52,7 +83,16 @@ describe('Finder tests', () => {
       fs.writeFileSync(`${pythonDir}.complete`, 'hello');
     });
     // This will throw if it doesn't find it in the cache and in the manifest (because no such version exists)
-    await finder.useCpythonVersion('1.2.3', 'x64');
+    await finder.useCpythonVersion('1.2.3', 'x64', true);
+    expect(spyCoreAddPath).toHaveBeenCalled();
+    expect(spyCoreExportVariable).toHaveBeenCalledWith(
+      'pythonLocation',
+      expect.anything()
+    );
+    expect(spyCoreExportVariable).toHaveBeenCalledWith(
+      'PKG_CONFIG_PATH',
+      expect.anything()
+    );
   });
 
   it('Finds pre-release Python version in the manifest', async () => {
@@ -74,17 +114,28 @@ describe('Finder tests', () => {
       fs.writeFileSync(`${pythonDir}.complete`, 'hello');
     });
     // This will throw if it doesn't find it in the manifest (because no such version exists)
-    await finder.useCpythonVersion('1.2.3-beta.2', 'x64');
+    await finder.useCpythonVersion('1.2.3-beta.2', 'x64', true);
+    expect(spyCoreAddPath).toHaveBeenCalled();
+    expect(spyCoreExportVariable).toHaveBeenCalledWith(
+      'pythonLocation',
+      expect.anything()
+    );
+    expect(spyCoreExportVariable).toHaveBeenCalledWith(
+      'PKG_CONFIG_PATH',
+      expect.anything()
+    );
   });
 
   it('Errors if Python is not installed', async () => {
     // This will throw if it doesn't find it in the cache and in the manifest (because no such version exists)
     let thrown = false;
     try {
-      await finder.useCpythonVersion('3.300000', 'x64');
+      await finder.useCpythonVersion('3.300000', 'x64', true);
     } catch {
       thrown = true;
     }
     expect(thrown).toBeTruthy();
+    expect(spyCoreAddPath).not.toHaveBeenCalled();
+    expect(spyCoreExportVariable).not.toHaveBeenCalled();
   });
 });

action.yml

@@ -17,6 +17,9 @@ inputs:
     default: ${{ github.token }}
   cache-dependency-path:
     description: 'Used to specify the path to dependency files. Supports wildcards or a list of file names for caching multiple dependencies.'
+  update-environment:
+    description: 'Set this option if you want the action to update environment variables.'
+    default: true
 outputs:
   python-version:
     description: "The installed python version. Useful when given a version range as input."

package-lock.json

@@ -10,7 +10,7 @@
       "license": "MIT",
       "dependencies": {
         "@actions/cache": "^2.0.2",
-        "@actions/core": "^1.2.3",
+        "@actions/core": "^1.7.0",
         "@actions/exec": "^1.1.0",
         "@actions/glob": "^0.2.0",
         "@actions/io": "^1.0.2",
@@ -55,14 +55,6 @@
         "minimatch": "^3.0.4"
       }
     },
-    "node_modules/@actions/cache/node_modules/@actions/http-client": {
-      "version": "1.0.11",
-      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-1.0.11.tgz",
-      "integrity": "sha512-VRYHGQV1rqnROJqdMvGUbY/Kn8vriQe/F9HR2AlYHzmKuM/p3kjNuXhmdBfcVgsvRWTz5C5XW5xvndZrVBuAYg==",
-      "dependencies": {
-        "tunnel": "0.0.6"
-      }
-    },
     "node_modules/@actions/cache/node_modules/semver": {
       "version": "6.3.0",
       "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
@@ -72,9 +64,12 @@
       }
     },
     "node_modules/@actions/core": {
-      "version": "1.2.6",
-      "resolved": "https://registry.npmjs.org/@actions/core/-/core-1.2.6.tgz",
-      "integrity": "sha512-ZQYitnqiyBc3D+k7LsgSBmMDVkOVidaagDG7j3fOym77jNunWRuYx7VSHa9GNfFZh+zh61xsCjRj4JxMZlDqTA=="
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/@actions/core/-/core-1.7.0.tgz",
+      "integrity": "sha512-7fPSS7yKOhTpgLMbw7lBLc1QJWvJBBAgyTX2PEhagWcKK8t0H8AKCoPMfnrHqIm5cRYH4QFPqD1/ruhuUE7YcQ==",
+      "dependencies": {
+        "@actions/http-client": "^1.0.11"
+      }
     },
     "node_modules/@actions/exec": {
       "version": "1.1.0",
@@ -94,9 +89,9 @@
       }
     },
     "node_modules/@actions/http-client": {
-      "version": "1.0.8",
-      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-1.0.8.tgz",
-      "integrity": "sha512-G4JjJ6f9Hb3Zvejj+ewLLKLf99ZC+9v+yCxoYf9vSyH+WkzPLB2LuUtRMGNkooMqdugGBFStIKXOuvH1W+EctA==",
+      "version": "1.0.11",
+      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-1.0.11.tgz",
+      "integrity": "sha512-VRYHGQV1rqnROJqdMvGUbY/Kn8vriQe/F9HR2AlYHzmKuM/p3kjNuXhmdBfcVgsvRWTz5C5XW5xvndZrVBuAYg==",
       "dependencies": {
         "tunnel": "0.0.6"
       }
@@ -11361,14 +11356,6 @@
             "minimatch": "^3.0.4"
           }
         },
-        "@actions/http-client": {
-          "version": "1.0.11",
-          "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-1.0.11.tgz",
-          "integrity": "sha512-VRYHGQV1rqnROJqdMvGUbY/Kn8vriQe/F9HR2AlYHzmKuM/p3kjNuXhmdBfcVgsvRWTz5C5XW5xvndZrVBuAYg==",
-          "requires": {
-            "tunnel": "0.0.6"
-          }
-        },
         "semver": {
           "version": "6.3.0",
           "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
@@ -11377,9 +11364,12 @@
       }
     },
     "@actions/core": {
-      "version": "1.2.6",
-      "resolved": "https://registry.npmjs.org/@actions/core/-/core-1.2.6.tgz",
-      "integrity": "sha512-ZQYitnqiyBc3D+k7LsgSBmMDVkOVidaagDG7j3fOym77jNunWRuYx7VSHa9GNfFZh+zh61xsCjRj4JxMZlDqTA=="
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/@actions/core/-/core-1.7.0.tgz",
+      "integrity": "sha512-7fPSS7yKOhTpgLMbw7lBLc1QJWvJBBAgyTX2PEhagWcKK8t0H8AKCoPMfnrHqIm5cRYH4QFPqD1/ruhuUE7YcQ==",
+      "requires": {
+        "@actions/http-client": "^1.0.11"
+      }
     },
     "@actions/exec": {
       "version": "1.1.0",
@@ -11399,9 +11389,9 @@
       }
     },
     "@actions/http-client": {
-      "version": "1.0.8",
-      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-1.0.8.tgz",
-      "integrity": "sha512-G4JjJ6f9Hb3Zvejj+ewLLKLf99ZC+9v+yCxoYf9vSyH+WkzPLB2LuUtRMGNkooMqdugGBFStIKXOuvH1W+EctA==",
+      "version": "1.0.11",
+      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-1.0.11.tgz",
+      "integrity": "sha512-VRYHGQV1rqnROJqdMvGUbY/Kn8vriQe/F9HR2AlYHzmKuM/p3kjNuXhmdBfcVgsvRWTz5C5XW5xvndZrVBuAYg==",
       "requires": {
         "tunnel": "0.0.6"
       }

package.json

@@ -24,7 +24,7 @@
   "license": "MIT",
   "dependencies": {
     "@actions/cache": "^2.0.2",
-    "@actions/core": "^1.2.3",
+    "@actions/core": "^1.7.0",
     "@actions/exec": "^1.1.0",
     "@actions/glob": "^0.2.0",
     "@actions/io": "^1.0.2",

src/find-pypy.ts

@@ -20,7 +20,8 @@ interface IPyPyVersionSpec {
 
 export async function findPyPyVersion(
   versionSpec: string,
-  architecture: string
+  architecture: string,
+  updateEnvironment: boolean
 ): Promise<{resolvedPyPyVersion: string; resolvedPythonVersion: string}> {
   let resolvedPyPyVersion = '';
   let resolvedPythonVersion = '';
@@ -54,10 +55,12 @@ export async function findPyPyVersion(
     `python${binaryExtension}`
   );
   const pythonLocation = pypyInstall.getPyPyBinaryPath(installDir);
-  core.exportVariable('pythonLocation', installDir);
-  core.exportVariable('PKG_CONFIG_PATH', pythonLocation + '/lib/pkgconfig');
-  core.addPath(pythonLocation);
-  core.addPath(_binDir);
+  if (updateEnvironment) {
+    core.exportVariable('pythonLocation', installDir);
+    core.exportVariable('PKG_CONFIG_PATH', pythonLocation + '/lib/pkgconfig');
+    core.addPath(pythonLocation);
+    core.addPath(_binDir);
+  }
   core.setOutput('python-version', 'pypy' + resolvedPyPyVersion.trim());
   core.setOutput('python-path', pythonPath);
 

src/find-python.ts

@@ -32,7 +32,8 @@ function binDir(installDir: string): string {
 
 export async function useCpythonVersion(
   version: string,
-  architecture: string
+  architecture: string,
+  updateEnvironment: boolean
 ): Promise<InstalledVersion> {
   const desugaredVersionSpec = desugarDevVersion(version);
   const semanticVersionSpec = pythonVersionToSemantic(desugaredVersionSpec);
@@ -69,46 +70,47 @@ export async function useCpythonVersion(
     );
   }
 
-  core.exportVariable('pythonLocation', installDir);
-  core.exportVariable('PKG_CONFIG_PATH', installDir + '/lib/pkgconfig');
-
-  if (IS_LINUX) {
-    const libPath = process.env.LD_LIBRARY_PATH
-      ? `:${process.env.LD_LIBRARY_PATH}`
-      : '';
-    const pyLibPath = path.join(installDir, 'lib');
-
-    if (!libPath.split(':').includes(pyLibPath)) {
-      core.exportVariable('LD_LIBRARY_PATH', pyLibPath + libPath);
-    }
-  }
-
   const _binDir = binDir(installDir);
   const binaryExtension = IS_WINDOWS ? '.exe' : '';
   const pythonPath = path.join(
     IS_WINDOWS ? installDir : _binDir,
     `python${binaryExtension}`
   );
-  core.addPath(installDir);
-  core.addPath(_binDir);
+  if (updateEnvironment) {
+    core.exportVariable('pythonLocation', installDir);
+    core.exportVariable('PKG_CONFIG_PATH', installDir + '/lib/pkgconfig');
 
-  if (IS_WINDOWS) {
-    // Add --user directory
-    // `installDir` from tool cache should look like $RUNNER_TOOL_CACHE/Python/<semantic version>/x64/
-    // So if `findLocalTool` succeeded above, we must have a conformant `installDir`
-    const version = path.basename(path.dirname(installDir));
-    const major = semver.major(version);
-    const minor = semver.minor(version);
+    if (IS_LINUX) {
+      const libPath = process.env.LD_LIBRARY_PATH
+        ? `:${process.env.LD_LIBRARY_PATH}`
+        : '';
+      const pyLibPath = path.join(installDir, 'lib');
 
-    const userScriptsDir = path.join(
-      process.env['APPDATA'] || '',
-      'Python',
-      `Python${major}${minor}`,
-      'Scripts'
-    );
-    core.addPath(userScriptsDir);
+      if (!libPath.split(':').includes(pyLibPath)) {
+        core.exportVariable('LD_LIBRARY_PATH', pyLibPath + libPath);
+      }
+    }
+    core.addPath(installDir);
+    core.addPath(_binDir);
+
+    if (IS_WINDOWS) {
+      // Add --user directory
+      // `installDir` from tool cache should look like $RUNNER_TOOL_CACHE/Python/<semantic version>/x64/
+      // So if `findLocalTool` succeeded above, we must have a conformant `installDir`
+      const version = path.basename(path.dirname(installDir));
+      const major = semver.major(version);
+      const minor = semver.minor(version);
+
+      const userScriptsDir = path.join(
+        process.env['APPDATA'] || '',
+        'Python',
+        `Python${major}${minor}`,
+        'Scripts'
+      );
+      core.addPath(userScriptsDir);
+    }
+    // On Linux and macOS, pip will create the --user directory and add it to PATH as needed.
   }
-  // On Linux and macOS, pip will create the --user directory and add it to PATH as needed.
 
   const installed = versionFromPath(installDir);
   core.setOutput('python-version', installed);

src/setup-python.ts

@@ -64,14 +64,23 @@ async function run() {
     if (version) {
       let pythonVersion: string;
       const arch: string = core.getInput('architecture') || os.arch();
+      const updateEnvironment = core.getBooleanInput('update-environment');
       if (isPyPyVersion(version)) {
-        const installed = await finderPyPy.findPyPyVersion(version, arch);
+        const installed = await finderPyPy.findPyPyVersion(
+          version,
+          arch,
+          updateEnvironment
+        );
         pythonVersion = `${installed.resolvedPyPyVersion}-${installed.resolvedPythonVersion}`;
         core.info(
           `Successfully set up PyPy ${installed.resolvedPyPyVersion} with Python (${installed.resolvedPythonVersion})`
         );
       } else {
-        const installed = await finder.useCpythonVersion(version, arch);
+        const installed = await finder.useCpythonVersion(
+          version,
+          arch,
+          updateEnvironment
+        );
         pythonVersion = installed.version;
         core.info(`Successfully set up ${installed.impl} (${pythonVersion})`);
       }