make it into a JavaScript action

This is a huge step back IMO, but I needed to be able to restore the
original PATH back as a "post" step.  Currently, composite actions don't
support post-actions, but JavaScript ones do.  I needed this due to a
bug: actions/cache wouldn't find Git's tar on windows-2016 (the one in
System32 would get used on windows-2019) if the PATH was cleaned up.

1 files changed, 39 insertions, 0 deletions

diff --git a/clean.js b/clean.js
new file mode 100644
index 0000000..22dfdff
--- /dev/null
+++ b/clean.js
@@ -0,0 +1,39 @@
+const os = require('os');
+const path = require('path');
+const process = require('process');
+
+const core = require('@actions/core');
+
+try {
+    if (os.platform != 'win32') {
+        core.warning('Not going to clean up PATH variable on ${os.platform}');
+        process.exit();
+    }
+
+    let custom_paths = core.getInput('dirs');
+    custom_paths = custom_paths.split(path.delimiter).filter(function(p) {
+        return p.length != 0;
+    });
+
+    // This seems to be the default on new installations.
+    // Also, MSYS2 does this.
+    const default_paths = [
+        'C:\\Windows\\system32',
+        'C:\\Windows',
+        'C:\\Windows\\System32\\Wbem',
+        'C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\',
+    ];
+
+    const add_default = core.getInput('default') == '1';
+
+    let new_path = custom_paths;
+    if (add_default) {
+        new_path = new_path.concat(default_paths);
+    }
+    new_path = new_path.join(path.delimiter);
+
+    core.exportVariable('ORIG_PATH', process.env.PATH);
+    core.exportVariable('PATH', new_path);
+} catch (error) {
+    core.setFailed(error.message);
+}