Bug 1426499 - Add an error message for unzipping tp5n on windows. r=erahm

--HG--
extra : rebase_source : e6999c6a418acc3ff616d4e79977d08fb0e49187

testing/awsy/mach_commands.py

@@ -130,7 +130,16 @@ class MachCommands(MachCommandBase):
                 tp5nzip,
                 '-d',
                 page_load_test_dir]}
-            self.run_process(**unzip_args)
+            try:
+                self.run_process(**unzip_args)
+            except Exception as exc:
+                troubleshoot = ''
+                if mozinfo.os == 'win':
+                    troubleshoot = ' Try using --web-root to specify a directory closer to the drive root.'
+
+                self.log(logging.ERROR, 'awsy', {'directory': page_load_test_dir, 'exception': exc},
+                    'Failed to unzip `tp5n.zip` into `{directory}` with `{exception}`.' + troubleshoot)
+                raise exc
 
         # If '--preferences' was not specified supply our default set.
         if not kwargs['prefs_files']: