Extract announce info from deliverable file

There were some undocumented expectations for formatting information in
repo's README files to be extracted by the email announcement scripts
that many (most?) repos are not following. Since we have information
like the bug reporting details in the deliverable files, this attempts
to parse the info from there.

Story: #2005279
Task: #30132

Change-Id: I31643d9c4f22c199c9fc385711fdf530c2836631
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

openstack_releases/release_notes.py

@@ -25,6 +25,7 @@ from reno import formatter
 from reno import loader
 
 from openstack_releases import rst2txt
+from openstack_releases import yamlutils
 
 LOG = logging.getLogger(__name__)
 
@@ -103,7 +104,7 @@ Download the package from:
 {% endif %}
 {% if bug_url %}
 
-Please report issues through launchpad:
+Please report issues through:
 
     {{ bug_url }}
 {% endif %}
@@ -158,13 +159,13 @@ cycle is available!  You can find the source code tarball at:
 
 Unless release-critical issues are found that warrant a release
 candidate respin, this candidate will be formally released as the
-final {{series|capitalize}} release. You are therefore strongly
-encouraged to test and validate this tarball!
+final {{series|capitalize}} release. You are therefore strongly encouraged
+to test and validate this tarball!
 
 Alternatively, you can directly test the stable/{{series|lower}} release
 branch at:
 
-    https://git.openstack.org/cgit/openstack/{{publishing_dir_name}}/log/?h=stable/{{series|lower}}
+    {{source_url}}/log/?h=stable/{{series|lower}}
 
 Release notes for {{project}} can be found at:
 
@@ -182,39 +183,46 @@ release crew's attention.
 """
 
 
-def parse_readme(repo_path):
+def parse_deliverable(series, repo):
+    """Parse useful information out of the deliverable file.
+
+    Currently only parses the bug URL, but could potentially be expanded to get
+    other useful settings.
+
+    :param series: The release series being processed.
+    :param repo: The name of the deliverable.
+    """
+    release_repo = os.path.realpath(
+        os.path.join(os.path.dirname(os.path.abspath(__file__)), '..'))
+
+    deliverable_path = os.path.join(
+        release_repo, 'deliverables', series.lower(), "%s.yaml" % repo)
+
+    # Hard coding source URL for now
     sections = {
         'bug_url': '',
-        'source_url': '',
+        'source_url': 'https://git.openstack.org/cgit/openstack/%s' % repo,
     }
-    readme_formats = ['rst', 'md']
-    for k in readme_formats:
-        readme_path = os.path.join(repo_path, 'README.%s' % k)
-        try:
-            f = open(readme_path, 'r', encoding='utf-8')
-            f.close()
-            break
-        except IOError:
-            continue
-    else:
-        LOG.warning("No README file found in %s\n"
-                    % repo_path)
+
+    try:
+        with open(deliverable_path, 'r') as d:
+            deliverable_info = yamlutils.loads(d)
+    except Exception:
+        # TODO(smcginnis): If the deliverable doesn't match the repo name, we
+        # can try to find it by loading all deliverable data and iterating on
+        # each deliverables repos to find it.
+        LOG.warning('Unable to parse %s %s deliverable file', repo, series)
         return sections
 
-    with open(readme_path, 'r', encoding='utf-8') as fh:
-        for line in fh:
-            for (name, key_name) in [("Bugs:", "bug_url"),
-                                     ("Source:", 'source_url')]:
-                pieces = line.split(name, 1)
-                if len(pieces) == 2:
-                    candidate = pieces[1].strip()
-                    if 'http' in candidate:
-                        sections[key_name] = candidate
-    for (k, v) in sections.items():
-        if not v:
-            what = k.replace("_", " ")
-            LOG.warning("No %s found in '%s'\n"
-                        % (what, readme_path))
+    if deliverable_info.get('launchpad'):
+        sections['bug_url'] = (
+            'https://bugs.launchpad.net/%s/+bugs' %
+            deliverable_info['launchpad'])
+    elif deliverable_info.get('storyboard'):
+        sections['bug_url'] = (
+            'https://storyboard.openstack.org/#!/project/%s' %
+            deliverable_info['storyboard'])
+
     return sections
 
 
@@ -326,8 +334,8 @@ def generate_release_notes(repo, repo_path,
             continue
         diff_stats.append(line)
 
-    # Extract + valdiate needed sections from readme...
-    readme_sections = parse_readme(repo_path)
+    # Extract + valdiate needed sections...
+    sections = parse_deliverable(series, publishing_dir_name)
     change_header = ["Changes in %s %s" % (repo_name, git_range)]
     change_header.append("-" * len(change_header[0]))
 
@@ -368,7 +376,7 @@ def generate_release_notes(repo, repo_path,
     elif is_release_candidate:
         email_to = 'openstack-discuss@lists.openstack.org'
 
-    params = dict(readme_sections)
+    params = dict(sections)
     params.update({
         'project': repo_name,
         'description': description,