fix: Handle compressed/noncompressed keys reliably

Author: mman

dist/index.js

@@ -81,8 +81,9 @@ async function setupKeys() {
     let path = await toolCache.downloadTool("https://swift.org/keys/all-keys.asc");
     core.debug("Examining verification keys");
     await (0, exec_1.exec)(`file "${path}"`);
+    const isPlaintext = await (0, exec_1.exec)(`gunzip --test "${path}"`, undefined, { silent: true });
     core.debug("Importing verification keys");
-    await (0, exec_1.exec)('bash', ['-c', `zcat "${path}" | gpg --import`]);
+    await (0, exec_1.exec)('bash', ['-c', `${isPlaintext ? "cat" : "zcat"} "${path}" | gpg --import`]);
     core.debug("Refreshing keys");
     await refreshKeys();
 }

src/gpg.ts

@@ -10,9 +10,10 @@ export async function setupKeys() {
 
   core.debug("Examining verification keys");
   await exec(`file "${path}"`);
+  const isPlaintext = await exec(`gunzip --test "${path}"`, undefined, { silent: true });
 
   core.debug("Importing verification keys");
-  await exec('bash', ['-c', `zcat "${path}" | gpg --import`]);
+  await exec('bash', ['-c', `${isPlaintext ? "cat" : "zcat"} "${path}" | gpg --import`]);
 
   core.debug("Refreshing keys");
   await refreshKeys();