remove unused hacks

src/installer.ts

@@ -5,8 +5,6 @@ import * as fs from 'fs';
 import * as path from 'path';
 import * as restm from 'typed-rest-client/RestClient';
 import * as semver from 'semver';
-import uuidV4 from 'uuid/v4';
-import {exec} from '@actions/exec/lib/exec';
 
 const IS_WINDOWS = process.platform === 'win32';
 const IS_DARWIN = process.platform === 'darwin';
@@ -130,58 +128,12 @@ async function extractFile(file: string, destDir: string): Promise<void> {
   }
 
   if ('tar.xz' === extName()) {
-    await extractTarXz(file, destDir);
+    await tc.extractTar(file, destDir, 'x');
   } else {
-    if (IS_DARWIN) {
-      await extractZipDarwin(file, destDir);
-    } else {
-      await tc.extractZip(file, destDir);
-    }
+    await tc.extractZip(file, destDir);
   }
 }
 
-/**
- * Extract a tar.xz
- *
- * @param file     path to the tar.xz
- * @param dest     destination directory. Optional.
- * @returns        path to the destination directory
- */
-export async function extractTarXz(
-  file: string,
-  dest?: string
-): Promise<string> {
-  if (!file) {
-    throw new Error("parameter 'file' is required");
-  }
-
-  dest = dest || (await _createExtractFolder(dest));
-  const tarPath: string = await io.which('tar', true);
-  await exec(`"${tarPath}"`, ['xC', dest, '-f', file]);
-
-  return dest;
-}
-
-async function _createExtractFolder(dest?: string): Promise<string> {
-  if (!dest) {
-    dest = path.join(tempDirectory, uuidV4());
-  }
-
-  await io.mkdirP(dest);
-  return dest;
-}
-
-async function extractZipDarwin(file: string, dest: string): Promise<void> {
-  const unzipPath = path.join(
-    __dirname,
-    '..',
-    'scripts',
-    'externals',
-    'unzip-darwin'
-  );
-  await exec(`"${unzipPath}"`, [file], {cwd: dest});
-}
-
 async function determineVersion(
   version: string,
   channel: string