Adding support for more PyPy versions and installing them on-flight (#168)

* add support to install pypy

* resolved comments, update readme, add e2e tests.

* resolve throw error

* Add pypy unit tests to cover code

* add tests

* Update test-pypy.yml

* Update test-python.yml

* Update test-python.yml

* Update README.md

* fixing tests

* change order

Co-authored-by: Maxim Lobanov <v-malob@microsoft.com>

* add pypy tests and fix issue with pypy-3-nightly

Co-authored-by: Maxim Lobanov <v-malob@microsoft.com>

src/utils.ts

@@ -0,0 +1,92 @@
+import fs from 'fs';
+import * as path from 'path';
+import * as semver from 'semver';
+
+export const IS_WINDOWS = process.platform === 'win32';
+export const IS_LINUX = process.platform === 'linux';
+const PYPY_VERSION_FILE = 'PYPY_VERSION';
+
+export interface IPyPyManifestAsset {
+  filename: string;
+  arch: string;
+  platform: string;
+  download_url: string;
+}
+
+export interface IPyPyManifestRelease {
+  pypy_version: string;
+  python_version: string;
+  stable: boolean;
+  latest_pypy: boolean;
+  files: IPyPyManifestAsset[];
+}
+
+/** create Symlinks for downloaded PyPy
+ *  It should be executed only for downloaded versions in runtime, because
+ *  toolcache versions have this setup.
+ */
+export function createSymlinkInFolder(
+  folderPath: string,
+  sourceName: string,
+  targetName: string,
+  setExecutable = false
+) {
+  const sourcePath = path.join(folderPath, sourceName);
+  const targetPath = path.join(folderPath, targetName);
+  if (fs.existsSync(targetPath)) {
+    return;
+  }
+
+  fs.symlinkSync(sourcePath, targetPath);
+  if (!IS_WINDOWS && setExecutable) {
+    fs.chmodSync(targetPath, '755');
+  }
+}
+
+export function validateVersion(version: string) {
+  return isNightlyKeyword(version) || Boolean(semver.validRange(version));
+}
+
+export function isNightlyKeyword(pypyVersion: string) {
+  return pypyVersion === 'nightly';
+}
+
+export function getPyPyVersionFromPath(installDir: string) {
+  return path.basename(path.dirname(installDir));
+}
+
+/**
+ * In tool-cache, we put PyPy to '<toolcache_root>/PyPy/<python_version>/x64'
+ * There is no easy way to determine what PyPy version is located in specific folder
+ * 'pypy --version' is not reliable enough since it is not set properly for preview versions
+ * "7.3.3rc1" is marked as '7.3.3' in 'pypy --version'
+ * so we put PYPY_VERSION file to PyPy directory when install it to VM and read it when we need to know version
+ * PYPY_VERSION contains exact version from 'versions.json'
+ */
+export function readExactPyPyVersionFile(installDir: string) {
+  let pypyVersion = '';
+  let fileVersion = path.join(installDir, PYPY_VERSION_FILE);
+  if (fs.existsSync(fileVersion)) {
+    pypyVersion = fs.readFileSync(fileVersion).toString();
+  }
+
+  return pypyVersion;
+}
+
+export function writeExactPyPyVersionFile(
+  installDir: string,
+  resolvedPyPyVersion: string
+) {
+  const pypyFilePath = path.join(installDir, PYPY_VERSION_FILE);
+  fs.writeFileSync(pypyFilePath, resolvedPyPyVersion);
+}
+
+/**
+ * Python version should be specified explicitly like "x.y" (2.7, 3.6, 3.7)
+ * "3.x" or "3" are not supported
+ * because it could cause ambiguity when both PyPy version and Python version are not precise
+ */
+export function validatePythonVersionFormatForPyPy(version: string) {
+  const re = /^\d+\.\d+$/;
+  return re.test(version);
+}