added method to parse metadata file from changelog release

tools/ubuntu_package_puller/source_ubuntu_packages.py

@@ -0,0 +1,83 @@
+from urllib import request
+from io import TextIOWrapper
+from itertools import groupby
+import re
+
+META_RELEASE_WORD_MATCHER = '^w\:'
+
+class SourceUbuntuPackages:
+
+    def __init__(self, distro_series):
+        self.distro_series = distro_series
+        self.meta_release_url = 'http://changelogs.ubuntu.com/meta-release'
+
+	# http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/wily/update-manager/wily/view/head:/UpdateManager/Core/MetaRelease.py#L100-#L105
+    def meta_release_parse(self):
+        """
+        Returns the meta_release_file parsed as a dict
+        Example text data:
+        Dist: breezy
+        Name: Breezy Badger
+        Version: 05.10
+        Date: Thu, 13 Oct 2005 19:34:42 UTC
+        Supported: 0
+        Description: This is the Breezy Badger release
+        Release-File: http://old-releases.ubuntu.com/ubuntu/dists/breezy/Release
+
+        Dist: dapper
+        Name: Dapper Drake
+        Version: 6.06 LTS
+        Date: Thu, 01 Jun 2006 9:00:00 UTC
+        Supported: 0
+        Description: This is the Dapper Drake release
+        Release-File: http://old-releases.ubuntu.com/ubuntu/dists/dapper/Release
+        ReleaseNotes: http://changelogs.ubuntu.com/EOLReleaseAnnouncement
+        UpgradeTool: http://old-releases.ubuntu.com/ubuntu/dists/dapper/main/dist-upgrader-all/current/dapper.tar.gz
+        UpgradeToolSignature: http://old-releases.ubuntu.com/ubuntu/dists/dapper/main/dist-upgrader-all/current/dapper.tar.gz.gpg
+        """
+        with request.urlopen(self.meta_release_url) as response:
+            index_counter = 0
+            lines = TextIOWrapper(response, encoding='utf-8')
+            stripped_lines = [
+                    re.split(META_RELEASE_WORD_MATCHER, l.strip()) for l in lines ]
+            grouped_lines = [list(group) for key, group in
+                    groupby(stripped_lines, lambda x: x == ['']) if not key]
+            group_of_dicts = []
+
+            for group in grouped_lines:
+                d = {}
+                # list of each group
+                for arr in group:
+                    l_str = arr[0]
+                    parts = re.split(r"(^\w+\:)", l_str.strip())
+                    split_parts = parts[1::]
+
+                    # this signifies the end of the current group
+                    if split_parts == []:
+                        break
+                    else:
+                        k = split_parts[0]
+                        v = split_parts[1]
+                        # remove some leading whitespace.
+                        cleaned_v = re.sub(r"^\s", '', v)
+                        d["{}".format(k)] = cleaned_v 
+                        group_of_dicts.append(d)
+
+            return group_of_dicts
+
+
+
+      #split_lines = [ l.split(":") for l in stripped_lines ]
+      #for l in split_lines:
+      #    if 'Dist' in l or 'Version' in l:
+      #        dist_and_versions.append(l[1].replace(' ', ''))
+
+      #distro_and_versions = [ tuple(dist_and_versions[x:x+2]) for x in range(0,
+      #        len(dist_and_versions), 2) ]
+
+      #return dict(distro_and_versions)
+
+if __name__ == '__main__':
+    s = SourceUbuntuPackages('dapper')
+    print((s.meta_release_parse()))
+