Add virt.all_capabilities

In order to get all possible capabilities from a host, the user has to
call virt.capabilities, and then loop over the guests and domains
before calling virt.domain_capabilities for each of them.

This commit embeds all this logic to get them all in a single
virt.all_capabilities call.

salt/modules/virt.py

@@ -4254,37 +4254,10 @@ def _parse_caps_loader(node):
     return result
 
 
-def domain_capabilities(emulator=None, arch=None, machine=None, domain=None, **kwargs):
+def _parse_domain_caps(caps):
     '''
-    Return the domain capabilities given an emulator, architecture, machine or virtualization type.
-
-    .. versionadded:: 2019.2.0
-
-    :param emulator: return the capabilities for the given emulator binary
-    :param arch: return the capabilities for the given CPU architecture
-    :param machine: return the capabilities for the given emulated machine type
-    :param domain: return the capabilities for the given virtualization type.
-    :param connection: libvirt connection URI, overriding defaults
-    :param username: username to connect with, overriding defaults
-    :param password: password to connect with, overriding defaults
-
-    The list of the possible emulator, arch, machine and domain can be found in
-    the host capabilities output.
-
-    If none of the parameters is provided the libvirt default domain capabilities
-    will be returned.
-
-    CLI Example:
-
-    .. code-block:: bash
-
-        salt '*' virt.domain_capabilities arch='x86_64' domain='kvm'
-
+    Parse the XML document of domain capabilities into a structure.
     '''
-    conn = __get_conn(**kwargs)
-    caps = ElementTree.fromstring(conn.getDomainCapabilities(emulator, arch, machine, domain, 0))
-    conn.close()
-
     result = {
         'emulator': caps.find('path').text if caps.find('path') is not None else None,
         'domain': caps.find('domain').text if caps.find('domain') is not None else None,
@@ -4324,6 +4297,82 @@ def domain_capabilities(emulator=None, arch=None, machine=None, domain=None, **k
     return result
 
 
+def domain_capabilities(emulator=None, arch=None, machine=None, domain=None, **kwargs):
+    '''
+    Return the domain capabilities given an emulator, architecture, machine or virtualization type.
+
+    .. versionadded:: Fluorine
+
+    :param emulator: return the capabilities for the given emulator binary
+    :param arch: return the capabilities for the given CPU architecture
+    :param machine: return the capabilities for the given emulated machine type
+    :param domain: return the capabilities for the given virtualization type.
+    :param connection: libvirt connection URI, overriding defaults
+    :param username: username to connect with, overriding defaults
+    :param password: password to connect with, overriding defaults
+
+    The list of the possible emulator, arch, machine and domain can be found in
+    the host capabilities output.
+
+    If none of the parameters is provided, the libvirt default one is returned.
+
+    CLI Example:
+
+    .. code-block:: bash
+
+        salt '*' virt.domain_capabilities arch='x86_64' domain='kvm'
+
+    '''
+    conn = __get_conn(**kwargs)
+    result = []
+    try:
+        caps = ElementTree.fromstring(conn.getDomainCapabilities(emulator, arch, machine, domain, 0))
+        result = _parse_domain_caps(caps)
+    finally:
+        conn.close()
+
+    return result
+
+
+def all_capabilities(**kwargs):
+    '''
+    Return the host and domain capabilities in a single call.
+
+    .. versionadded:: Neon
+
+    :param connection: libvirt connection URI, overriding defaults
+    :param username: username to connect with, overriding defaults
+    :param password: password to connect with, overriding defaults
+
+    CLI Example:
+
+    .. code-block:: bash
+
+        salt '*' virt.all_capabilities
+
+    '''
+    conn = __get_conn(**kwargs)
+    result = {}
+    try:
+        host_caps = ElementTree.fromstring(conn.getCapabilities())
+        domains = [[(guest.get('arch', {}).get('name', None), key)
+                    for key in guest.get('arch', {}).get('domains', {}).keys()]
+                   for guest in [_parse_caps_guest(guest) for guest in host_caps.findall('guest')]]
+        flattened = [pair for item in (x for x in domains) for pair in item]
+        result = {
+                'host': {
+                    'host': _parse_caps_host(host_caps.find('host')),
+                    'guests': [_parse_caps_guest(guest) for guest in host_caps.findall('guest')]
+                },
+                'domains': [_parse_domain_caps(ElementTree.fromstring(
+                                conn.getDomainCapabilities(None, arch, None, domain)))
+                            for (arch, domain) in flattened]}
+    finally:
+        conn.close()
+
+    return result
+
+
 def cpu_baseline(full=False, migratable=False, out='libvirt', **kwargs):
     '''
     Return the optimal 'custom' CPU baseline config for VM's on this minion

tests/unit/modules/test_virt.py

@@ -2216,6 +2216,62 @@ def test_domain_capabilities(self):
 
         self.assertEqual(expected, caps)
 
+    def test_all_capabilities(self):
+        '''
+        Test the virt.domain_capabilities default output
+        '''
+        domainXml = '''
+<domainCapabilities>
+  <path>/usr/bin/qemu-system-x86_64</path>
+  <domain>kvm</domain>
+  <machine>virt-2.12</machine>
+  <arch>x86_64</arch>
+  <vcpu max='255'/>
+  <iothreads supported='yes'/>
+</domainCapabilities>
+        '''
+        hostXml = '''
+<capabilities>
+  <host>
+    <uuid>44454c4c-3400-105a-8033-b3c04f4b344a</uuid>
+    <cpu>
+      <arch>x86_64</arch>
+      <model>Nehalem</model>
+      <vendor>Intel</vendor>
+      <microcode version='25'/>
+      <topology sockets='1' cores='4' threads='2'/>
+    </cpu>
+  </host>
+  <guest>
+    <os_type>hvm</os_type>
+    <arch name='x86_64'>
+      <wordsize>64</wordsize>
+      <emulator>/usr/bin/qemu-system-x86_64</emulator>
+      <machine maxCpus='255'>pc-i440fx-2.6</machine>
+      <machine canonical='pc-i440fx-2.6' maxCpus='255'>pc</machine>
+      <machine maxCpus='255'>pc-0.12</machine>
+      <domain type='qemu'/>
+      <domain type='kvm'>
+        <emulator>/usr/bin/qemu-kvm</emulator>
+        <machine maxCpus='255'>pc-i440fx-2.6</machine>
+        <machine canonical='pc-i440fx-2.6' maxCpus='255'>pc</machine>
+        <machine maxCpus='255'>pc-0.12</machine>
+      </domain>
+    </arch>
+  </guest>
+</capabilities>
+        '''
+
+        # pylint: disable=no-member
+        self.mock_conn.getCapabilities.return_value = hostXml
+        self.mock_conn.getDomainCapabilities.side_effect = [
+                domainXml, domainXml.replace('<domain>kvm', '<domain>qemu')]
+        # pylint: enable=no-member
+
+        caps = virt.all_capabilities()
+        self.assertEqual('44454c4c-3400-105a-8033-b3c04f4b344a', caps['host']['host']['uuid'])
+        self.assertEqual(set(['qemu', 'kvm']), set([domainCaps['domain'] for domainCaps in caps['domains']]))
+
     def test_network_tag(self):
         '''
         Test virt._get_net_xml() with VLAN tag