move some of basic into common (#48078)

* move file functions into common.file

* move *_PERM_BITS and mark as private (_*_PERM_BITS)

* move get_{platform, distribution, distribution_version} get_all_subclasses and load_platform_subclass into common.sys_info

* forgot get_distribution_version, properly rename get_all_subclasses

* add common/sys_info.py to recursive finder test

* update module paths in test_platform_distribution.py

* update docstrings, _get_all_subclasses -> get_all_subclasses

* forgot to update names

* remove trailing whitespace

lib/ansible/module_utils/common/file.py

@@ -27,8 +27,39 @@ except ImportError:
     HAVE_SELINUX = False
 
 
-class LockTimeout(Exception):
-    pass
+FILE_ATTRIBUTES = {
+    'A': 'noatime',
+    'a': 'append',
+    'c': 'compressed',
+    'C': 'nocow',
+    'd': 'nodump',
+    'D': 'dirsync',
+    'e': 'extents',
+    'E': 'encrypted',
+    'h': 'blocksize',
+    'i': 'immutable',
+    'I': 'indexed',
+    'j': 'journalled',
+    'N': 'inline',
+    's': 'zero',
+    'S': 'synchronous',
+    't': 'notail',
+    'T': 'blockroot',
+    'u': 'undelete',
+    'X': 'compressedraw',
+    'Z': 'compresseddirty',
+}
+
+
+# Used for parsing symbolic file perms
+MODE_OPERATOR_RE = re.compile(r'[+=-]')
+USERS_RE = re.compile(r'[^ugo]')
+PERMS_RE = re.compile(r'[^rwxXstugo]')
+
+
+_PERM_BITS = 0o7777          # file mode permission bits
+_EXEC_PERM_BITS = 0o0111     # execute permission bits
+_DEFAULT_PERM = 0o0666       # default file permission bits
 
 
 def is_executable(path):
@@ -45,6 +76,34 @@ def is_executable(path):
     return ((stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH) & os.stat(path)[stat.ST_MODE])
 
 
+def format_attributes(attributes):
+    attribute_list = [FILE_ATTRIBUTES.get(attr) for attr in attributes if attr in FILE_ATTRIBUTES]
+    return attribute_list
+
+
+def get_flags_from_attributes(attributes):
+    flags = [key for key, attr in FILE_ATTRIBUTES.items() if attr in attributes]
+    return ''.join(flags)
+
+
+def get_file_arg_spec():
+    arg_spec = dict(
+        mode=dict(type='raw'),
+        owner=dict(),
+        group=dict(),
+        seuser=dict(),
+        serole=dict(),
+        selevel=dict(),
+        setype=dict(),
+        attributes=dict(aliases=['attr']),
+    )
+    return arg_spec
+
+
+class LockTimeout(Exception):
+    pass
+
+
 class FileLock:
     '''
     Currently FileLock is implemented via fcntl.flock on a lock file, however this