Add schema to apt configure config (#357)

Create a schema object for the `apt_configure` module and
validate this schema in the `handle`  function of the module.

There are some considerations regarding this PR:

* The `primary` and `security` keys have the exact same properties. I
  tried to eliminate this redundancy by moving their properties to a
  common place and then just referencing it for both security and
  primary. Similar to what is documented here:
    https://json-schema.org/understanding-json-schema/structuring.html
  under the `Reuse` paragraph.  However, this approach does not work,
  because the `#` pointer goes to the beginning of the file, which is
  a python module instead of a json file, not allowing the pointer to
  find the correct definition. What I did was to create a separate dict
  for the mirror config and reuse it for primary and security, but
  maybe there are better approaches to do that.
* There was no documentation for the config `debconf_selections`. I
  tried to infer what it supposed to do by looking at the code and the
  `debconf-set-selections`  manpage, but my description may not be
  accurate or complete.
* Add a _parse_description function to schema.py to render multi-line
  preformatted content instead of squashing all whitespace

LP: #1858884

1 files changed, 11 insertions, 11 deletions

diff --git a/cloudinit/config/cc_write_files.py b/cloudinit/config/cc_write_files.py
index 204cbfd6..8601e707 100644
--- a/cloudinit/config/cc_write_files.py
+++ b/cloudinit/config/cc_write_files.py
@@ -103,7 +103,7 @@ schema = {
                         'type': 'string',
                         'description': dedent("""\
                             Path of the file to which ``content`` is decoded
-                             and written
+                            and written
                         """),
                     },
                     'content': {
@@ -111,9 +111,9 @@ schema = {
                         'default': '',
                         'description': dedent("""\
                             Optional content to write to the provided ``path``.
-                              When content is present and encoding is not '%s',
-                              decode the content prior to writing. Default:
-                              **''**
+                            When content is present and encoding is not '%s',
+                            decode the content prior to writing. Default:
+                            **''**
                         """ % UNKNOWN_ENC),
                     },
                     'owner': {
@@ -121,7 +121,7 @@ schema = {
                         'default': DEFAULT_OWNER,
                         'description': dedent("""\
                             Optional owner:group to chown on the file. Default:
-                             **{owner}**
+                            **{owner}**
                         """.format(owner=DEFAULT_OWNER)),
                     },
                     'permissions': {
@@ -129,8 +129,8 @@ schema = {
                         'default': oct(DEFAULT_PERMS).replace('o', ''),
                         'description': dedent("""\
                             Optional file permissions to set on ``path``
-                             represented as an octal string '0###'. Default:
-                             **'{perms}'**
+                            represented as an octal string '0###'. Default:
+                            **'{perms}'**
                         """.format(perms=oct(DEFAULT_PERMS).replace('o', ''))),
                     },
                     'encoding': {
@@ -139,16 +139,16 @@ schema = {
                         'enum': supported_encoding_types,
                         'description': dedent("""\
                             Optional encoding type of the content. Default is
-                             **text/plain** and no content decoding is
-                             performed. Supported encoding types are:
-                             %s.""" % ", ".join(supported_encoding_types)),
+                            **text/plain** and no content decoding is
+                            performed. Supported encoding types are:
+                            %s.""" % ", ".join(supported_encoding_types)),
                     },
                     'append': {
                         'type': 'boolean',
                         'default': False,
                         'description': dedent("""\
                             Whether to append ``content`` to existing file if
-                             ``path`` exists. Default: **false**.
+                            ``path`` exists. Default: **false**.
                         """),
                     },
                 },