Fix places where path needs to be bytes on python3

These were discovered on python3 with fetch code that fails on errors.  Probably could be
provoked with particular sets of arguments to stat as well.

lib/ansible/module_utils/basic.py

@@ -915,10 +915,18 @@ class AnsibleModule(object):
         return (uid, gid)
 
     def find_mount_point(self, path):
-        path = os.path.realpath(os.path.expanduser(os.path.expandvars(path)))
-        while not os.path.ismount(path):
-            path = os.path.dirname(path)
-        return path
+        path_is_bytes = False
+        if isinstance(path, binary_type):
+            path_is_bytes = True
+
+        b_path = os.path.realpath(to_bytes(os.path.expanduser(os.path.expandvars(path)), errors='surrogate_or_strict'))
+        while not os.path.ismount(b_path):
+            b_path = os.path.dirname(b_path)
+
+        if path_is_bytes:
+            return b_path
+
+        return to_text(b_path, errors='surrogate_or_strict')
 
     def is_special_selinux_path(self, path):
         """

lib/ansible/modules/files/stat.py

@@ -477,11 +477,11 @@ def main():
 
     # resolved permissions
     for perm in [('readable', os.R_OK), ('writeable', os.W_OK), ('executable', os.X_OK)]:
-        output[perm[0]] = os.access(path, perm[1])
+        output[perm[0]] = os.access(b_path, perm[1])
 
     # symlink info
     if output.get('islnk'):
-        output['lnk_source'] = os.path.realpath(path)
+        output['lnk_source'] = os.path.realpath(b_path)
 
     try: # user data
         pw = pwd.getpwuid(st.st_uid)
@@ -500,19 +500,19 @@ def main():
         if get_md5:
             # Will fail on FIPS-140 compliant systems
             try:
-                output['md5'] = module.md5(path)
+                output['md5'] = module.md5(b_path)
             except ValueError:
                 output['md5'] = None
 
         if get_checksum:
-            output['checksum'] = module.digest_from_file(path, checksum_algorithm)
+            output['checksum'] = module.digest_from_file(b_path, checksum_algorithm)
 
     # try to get mime data if requested
     if get_mime:
         output['mimetype'] = output['charset'] = 'unknown'
         mimecmd = module.get_bin_path('file')
         if mimecmd:
-            mimecmd = [mimecmd, '-i', path]
+            mimecmd = [mimecmd, '-i', b_path]
             try:
                 rc, out, err = module.run_command(mimecmd)
                 if rc == 0:
@@ -527,7 +527,7 @@ def main():
         output['version'] = None
         output['attributes'] = []
         output['attr_flags'] = ''
-        out = module.get_file_attributes(path)
+        out = module.get_file_attributes(b_path)
         for x in ('version', 'attributes', 'attr_flags'):
             if x in out:
                 output[x] = out[x]

test/units/module_utils/test_basic.py

@@ -647,7 +647,7 @@ class TestModuleUtilsBasic(ModuleTestCase):
         )
 
         def _mock_ismount(path):
-            if path == '/':
+            if path == b'/':
                 return True
             return False
 
@@ -655,7 +655,9 @@ class TestModuleUtilsBasic(ModuleTestCase):
             self.assertEqual(am.find_mount_point('/root/fs/../mounted/path/to/whatever'), '/')
 
         def _mock_ismount(path):
-            if path == '/subdir/mount':
+            if path == b'/subdir/mount':
+                return True
+            if path == b'/':
                 return True
             return False