module: add report tar debug information (#610)

* module: add report tar debug information

filecoin-station/zinnia#485 (comment)

* clean up

* explicit

lib/modules.js

@@ -192,6 +192,8 @@ export async function updateSourceFiles ({
     }
   }
 
+  const tarExtractWarnings = []
+  const tarExtractEntries = []
   try {
     const reader = await CarReader.fromIterable(res.body)
     const entries = exporter(cid, {
@@ -216,8 +218,18 @@ export async function updateSourceFiles ({
       // `{ strip: 1 }` tells tar to remove the top-level directory (e.g. `mod-peer-checker-v1.0.0`)
       await pipeline(
         /** @type {any} */(entry.content()),
-        /** @type {any} */(tar.x({ strip: 1, C: outDir }))
+        /** @type {any} */(tar.x({
+          strip: 1,
+          C: outDir,
+          onwarn (code, message, data) {
+            tarExtractWarnings.push({ code, message, data })
+          },
+          onReadEntry (entry) {
+            tarExtractEntries.push(entry.path)
+          }
+        }))
       )
+      await stat(join(outDir, 'main.js'))
     }
   } catch (err) {
     try {
@@ -227,6 +239,8 @@ export async function updateSourceFiles ({
         throw err
       }
     }
+    err.tarExtractWarnings = tarExtractWarnings
+    err.tarExtractEntries = tarExtractEntries
     throw err
   }