[Acloud] Check if user has access to the project on start

Cherry-pick cl/148795271

TEST: Manually test the google3 version. can't test the android tree
version untill b/35918788 is fixed
BUG:32411892

Change-Id: I8920db33f82d035218ef608962849628bbc8d9eb
diff --git a/internal/lib/gcompute_client.py b/internal/lib/gcompute_client.py
index 8cd32b3..05710c4 100755
--- a/internal/lib/gcompute_client.py
+++ b/internal/lib/gcompute_client.py
@@ -26,6 +26,7 @@
 and it only keeps states about authentication. ComputeClient should be very
 generic, and only knows how to talk to Compute Engine APIs.
 """
+import copy
 import functools
 import logging
 import os
@@ -60,6 +61,7 @@
     OPERATION_TIMEOUT_SECS = 15 * 60  # 15 mins
     OPERATION_POLL_INTERVAL_SECS = 5
     MACHINE_SIZE_METRICS = ["guestCpus", "memoryMb"]
+    ACCESS_DENIED_CODE = 403
 
     def __init__(self, acloud_config, oauth2_credentials):
         """Initialize.
@@ -1015,3 +1017,25 @@
         sshkey_item["value"] = "\n".join([sshkey_item["value"].strip(), entry
                                           ]).strip()
         self.SetCommonInstanceMetadata(metadata)
+
+    def CheckAccess(self):
+        """Check if the user has read access to the cloud project.
+
+        Returns:
+            True if the user has at least read access to the project.
+            False otherwise.
+
+        Raises:
+            errors.HttpError if other unexpected error happens when
+            accessing the project.
+        """
+        api = self.service.zones().list(project=self._project)
+        retry_http_codes = copy.copy(self.RETRY_HTTP_CODES)
+        retry_http_codes.remove(self.ACCESS_DENIED_CODE)
+        try:
+            self.Execute(api, retry_http_codes=retry_http_codes)
+        except errors.HttpError as e:
+            if e.code == self.ACCESS_DENIED_CODE:
+                return False
+            raise
+        return True