Fix gpg handling on windows

Author: fwal

src/gpg.ts

@@ -1,25 +1,33 @@
 import { exec } from "@actions/exec";
 import * as core from "@actions/core";
 import * as toolCache from "@actions/tool-cache";
+import { OS, System } from "./os";
 
-export async function setupKeys() {
+export async function setupKeys(system: System) {
   core.debug("Fetching verification keys");
   let path = await toolCache.downloadTool(
     "https://swift.org/keys/all-keys.asc"
   );
 
-  core.debug("Examining verification keys");
-  await exec(`file "${path}"`);
-  const isPlaintext = await exec(`gunzip --test "${path}"`, undefined, {
-    silent: true,
-    ignoreReturnCode: true,
-  });
+  if (system.os === OS.Ubuntu || system.os === OS.MacOS) {
+    core.debug("Examining verification keys");
+    await exec(`file "${path}"`);
+    const isPlaintext = await exec(`gunzip --test "${path}"`, undefined, {
+      silent: true,
+      ignoreReturnCode: true,
+    });
+
+    core.debug("Importing verification keys");
+    await exec("bash", [
+      "-c",
+      `${isPlaintext ? "cat" : "zcat"} "${path}" | gpg --import`,
+    ]);
+  }
 
-  core.debug("Importing verification keys");
-  await exec("bash", [
-    "-c",
-    `${isPlaintext ? "cat" : "zcat"} "${path}" | gpg --import`,
-  ]);
+  if (system.os === OS.Windows) {
+    core.debug("Importing verification keys");
+    await exec(`gpg --import "${path}"`);
+  }
 
   core.debug("Refreshing keys");
   await refreshKeys();

src/linux-install.ts

@@ -18,7 +18,7 @@ export async function install(version: string, system: System) {
   if (swiftPath === null || swiftPath.trim().length == 0) {
     core.debug(`No matching installation found`);
 
-    await setupKeys();
+    await setupKeys(system);
 
     const swiftPkg = swiftPackage(version, system);
     let { pkg, signature } = await download(swiftPkg);

src/windows-install.ts

@@ -21,7 +21,7 @@ export async function install(version: string, system: System) {
   if (swiftPath === null || swiftPath.trim().length == 0) {
     core.debug(`No cached installer found`);
 
-    await setupKeys();
+    await setupKeys(system);
 
     let { exe, signature } = await download(swiftPkg);
     await verify(signature, exe);