fix: gracefully handle nonexistent global installation directory (#7640)

Handle arborist error when loading and checking package in global tree.

workspaces/libnpmexec/lib/index.js

@@ -202,14 +202,19 @@ const exec = async (opts) => {
     args[0] = getBinFromManifest(commandManifest)
 
     if (needInstall.length > 0 && globalPath) {
-      // See if the package is installed globally, and run the translated bin
+      // See if the package is installed globally. If it is, run the translated bin
       const globalArb = new Arborist({ ...flatOptions, path: globalPath, global: true })
-      const globalTree = await globalArb.loadActual()
-      const { manifest: globalManifest } =
-        await missingFromTree({ spec, tree: globalTree, flatOptions, shallow: true })
-      if (!globalManifest && await fileExists(`${globalBin}/${args[0]}`)) {
-        binPaths.push(globalBin)
-        return await run()
+      const globalTree = await globalArb.loadActual().catch(() => {
+        log.verbose(`Could not read global path ${globalPath}, ignoring`)
+        return null
+      })
+      if (globalTree) {
+        const { manifest: globalManifest } =
+          await missingFromTree({ spec, tree: globalTree, flatOptions, shallow: true })
+        if (!globalManifest && await fileExists(`${globalBin}/${args[0]}`)) {
+          binPaths.push(globalBin)
+          return await run()
+        }
       }
     }
   }

workspaces/libnpmexec/test/registry.js

@@ -226,3 +226,22 @@ t.test('packages with different versions in the global tree', async t => {
     created: 'global/node_modules/@npmcli/A/bin-file.js',
   })
 })
+
+t.test('run from registry - non existant global path', async t => {
+  const { fixtures, package } = createPkg({ versions: ['2.0.0'] })
+
+  const { exec, path, registry, readOutput } = setup(t, {
+    testdir: fixtures,
+  })
+
+  await package({ registry, path })
+
+  await exec({
+    args: ['@npmcli/create-index'],
+    globalPath: resolve(path, 'non-existant'),
+  })
+
+  t.match(await readOutput('@npmcli-create-index'), {
+    value: 'packages-2.0.0',
+  })
+})