tool-cache: Support for extracting xar compatible archives (#207)

* Test xar extraction

* Support for extracting xar compatible archives

* Only allow extractXar on mac

* Create xar during test instead of using prebuilt

* Update lockfiles

* Add verbose flag if debug

* Add extractXar example to readme

* Revert "Update lockfiles"

This reverts commit a6cbddccf6bf8f7278948e719dc9e28329608cdf.

* Use node pkg in example

* Remove and ignore prebuilt xar

* Tests for non-existing dir and without flags

* Better arguments handling

* Make sure that target directory exists

Co-authored-by: Thomas Boop <52323235+thboop@users.noreply.github.com>

README.md

@@ -29,6 +29,10 @@ if (process.platform === 'win32') {
   const node12Path = await tc.downloadTool('https://nodejs.org/dist/v12.7.0/node-v12.7.0-win-x64.7z');
   const node12ExtractedFolder = await tc.extract7z(node12Path, 'path/to/extract/to');
 }
+else if (process.platform === 'darwin') {
+  const node12Path = await tc.downloadTool('https://nodejs.org/dist/v12.7.0/node-v12.7.0.pkg');
+  const node12ExtractedFolder = await tc.extractXar(node12Path, 'path/to/extract/to');
+}
 else {
   const node12Path = await tc.downloadTool('https://nodejs.org/dist/v12.7.0/node-v12.7.0-linux-x64.tar.gz');
   const node12ExtractedFolder = await tc.extractTar(node12Path, 'path/to/extract/to');