apt_repository: Relax PPA checks and add basename (#5432)

Allow installation of PPA repositories on non-Ubuntu Debian derived
distribution targets (e.g. neon, Mint, Debian itself) by removing the
specific check for UbuntuDistribution before allowing PPA: format
sources. This fixes the addition of PPA repositories under KDE neon (as
the codenames match the base Ubuntu distribution).

To make the functionality also useful under Mint and Debian which have
different codenames to their Ubuntu upstream / downstream releases, add
a 'codename' option to override the default used in the PPA source
entry.

lib/ansible/modules/packaging/os/apt_repository.py

@@ -28,9 +28,8 @@
 description:
     - Add or remove an APT repositories in Ubuntu and Debian.
 notes:
-    - This module works on Debian and Ubuntu.
+    - This module works on Debian, Ubuntu and their derivatives.
     - This module supports Debian Squeeze (version 6) as well as its successors.
-    - This module treats Debian and Ubuntu distributions separately. So PPA could be installed only on Ubuntu machines.
 options:
     repo:
         required: true
@@ -70,6 +69,12 @@
               Defaults to a file name based on the repository source url.
               The .list extension will be automatically added.
         required: false
+    codename:
+        version_added: '2.3'
+        description:
+            - Override the distribution codename to use for PPA repositories.
+              Should usually only be set when working with a PPA on a non-Ubuntu target (e.g. Debian or Mint)
+        required: false
 author: "Alexander Saltanov (@sashka)"
 version_added: "0.7"
 requirements:
@@ -90,9 +95,11 @@
 # Remove specified repository from sources list.
 apt_repository: repo='deb http://archive.canonical.com/ubuntu hardy partner' state=absent
 
-# On Ubuntu target: add nginx stable repository from PPA and install its signing key.
-# On Debian target: adding PPA is not available, so it will fail immediately.
+# Add nginx stable repository from PPA and install its signing key.
+# On Ubuntu target:
 apt_repository: repo='ppa:nginx/stable'
+# On Debian target
+apt_repository: repo='ppa:nginx/stable' codename='trusty'
 '''
 
 import glob
@@ -375,6 +382,7 @@ class UbuntuSourcesList(SourcesList):
     def __init__(self, module, add_ppa_signing_keys_callback=None):
         self.module = module
         self.add_ppa_signing_keys_callback = add_ppa_signing_keys_callback
+        self.codename = module.params['codename'] or distro.codename
         super(UbuntuSourcesList, self).__init__(module)
 
     def _get_ppa_info(self, owner_name, ppa_name):
@@ -394,7 +402,7 @@ def _expand_ppa(self, path):
         except IndexError:
             ppa_name = 'ppa'
 
-        line = 'deb http://ppa.launchpad.net/%s/%s/ubuntu %s main' % (ppa_owner, ppa_name, distro.codename)
+        line = 'deb http://ppa.launchpad.net/%s/%s/ubuntu %s main' % (ppa_owner, ppa_name, self.codename)
         return line, ppa_owner, ppa_name
 
     def _key_already_exists(self, key_fingerprint):
@@ -415,7 +423,7 @@ def add_source(self, line, comment='', file=None):
                     command = ['apt-key', 'adv', '--recv-keys', '--keyserver', 'hkp://keyserver.ubuntu.com:80', info['signing_key_fingerprint']]
                     self.add_ppa_signing_keys_callback(command)
 
-            file = file or self._suggest_filename('%s_%s' % (line, distro.codename))
+            file = file or self._suggest_filename('%s_%s' % (line, self.codename))
         else:
             source = self._parse(line, raise_if_invalid_or_disabled=True)[2]
             file = file or self._suggest_filename(source)
@@ -469,6 +477,7 @@ def main():
             # this should not be needed, but exists as a failsafe
             install_python_apt=dict(required=False, default="yes", type='bool'),
             validate_certs = dict(default='yes', type='bool'),
+            codename = dict(required=False),
         ),
         supports_check_mode=True,
     )
@@ -487,13 +496,11 @@ def main():
         else:
             module.fail_json(msg='%s is not installed, and install_python_apt is False' % PYTHON_APT)
 
-    if isinstance(distro, aptsources_distro.UbuntuDistribution):
+    if isinstance(distro, aptsources_distro.Distribution):
         sourceslist = UbuntuSourcesList(module,
             add_ppa_signing_keys_callback=get_add_ppa_signing_key_callback(module))
-    elif isinstance(distro, aptsources_distro.Distribution):
-        sourceslist = SourcesList(module)
     else:
-        module.fail_json(msg='Module apt_repository supports only Debian and Ubuntu.')
+        module.fail_json(msg='Module apt_repository is not supported on target.')
 
     sources_before = sourceslist.dump()