src/gpg.ts: Fix regression with C:\dir style keyring paths

gpg on windows doesn't seem to accept C:\dir paths, it only copes with
/c/dir.

Signed-off-by: Andrei Horodniceanu <[email protected]>

Author: the-horo

dist/index.js

@@ -6,11 +6,22 @@ export async function verify(file_path: string, sig_url: string) {
     let keyring = await tc.downloadTool("https://dlang.org/d-keyring.gpg");
     let sig_path = await tc.downloadTool(sig_url);
     // hack to workaround gpg on windows interaction with paths
-    keyring = core.toPosixPath(keyring);
-    sig_path = core.toPosixPath(sig_path);
+    keyring = win_path_to_msys(keyring);
+
     await exec.exec(
-	'gpg',
+        'gpg',
         [ '--lock-never', '--verify', '--keyring', keyring, '--no-default-keyring',
           sig_path, file_path ]
     )
 }
+
+// hack to workaround gpg on windows interaction with paths
+function win_path_to_msys(path: string) {
+    if (process.platform != "win32")
+        return path
+
+    path = core.toPosixPath(path)
+    const drive = path[0]
+    path = '/' + drive + path.slice(2)
+    return path
+}