Option to merge current pillar with opts['pillar'] during pillar compile

Fixes #47501

doc/ref/configuration/minion.rst

@@ -3219,3 +3219,31 @@ URL of the repository:
 Replace ``<commit_id>`` with the SHA1 hash of a commit ID. Specifying a commit
 ID is useful in that it allows one to revert back to a previous version in the
 event that an error is introduced in the latest revision of the repo.
+
+``ssh_merge_pillar``
+--------------------
+
+.. versionadded:: 2018.3.2
+
+Default: ``True``
+
+Merges the compiled pillar data with the pillar data already available globally.
+This is useful when using ``salt-ssh`` or ``salt-call --local`` and overriding the pillar
+data in a state file:
+
+.. code-block:: yaml
+
+    apply_showpillar:
+      module.run:
+        - name: state.apply
+        - mods:
+          - showpillar
+        - kwargs:
+              pillar:
+                  test: "foo bar"
+
+If set to ``True`` the ``showpillar`` state will have access to the
+global pillar data.
+
+If set to ``False`` only the overriding pillar data will be available
+to the ``showpillar`` state.

salt/config/__init__.py

@@ -989,6 +989,7 @@ VALID_OPTS = {
     'ssh_identities_only': bool,
     'ssh_log_file': six.string_types,
     'ssh_config_file': six.string_types,
+    'ssh_merge_pillar': bool,
 
     # Enable ioflo verbose logging. Warning! Very verbose!
     'ioflo_verbose': int,
@@ -1485,6 +1486,7 @@ DEFAULT_MINION_OPTS = {
     },
     'discovery': False,
     'schedule': {},
+    'ssh_merge_pillar': True
 }
 
 DEFAULT_MASTER_OPTS = {
@@ -2088,7 +2090,7 @@ def _validate_ssh_minion_opts(opts):
 
     for opt_name in list(ssh_minion_opts):
         if re.match('^[a-z0-9]+fs_', opt_name, flags=re.IGNORECASE) \
-                or 'pillar' in opt_name \
+                or ('pillar' in opt_name and not 'ssh_merge_pillar' == opt_name) \
                 or opt_name in ('fileserver_backend',):
             log.warning(
                 '\'%s\' is not a valid ssh_minion_opts parameter, ignoring',

salt/pillar/__init__.py

@@ -1014,6 +1014,13 @@ class Pillar(object):
             mopts['file_roots'] = self.actual_file_roots
             mopts['saltversion'] = __version__
             pillar['master'] = mopts
+        if 'pillar' in self.opts and self.opts.get('ssh_merge_pillar', False):
+            pillar = merge(
+                self.opts['pillar'],
+                pillar,
+                self.merge_strategy,
+                self.opts.get('renderer', 'yaml'),
+                self.opts.get('pillar_merge_lists', False))
         if errors:
             for error in errors:
                 log.critical('Pillar render error: %s', error)