slap/standalone: Add slapos node software --only

Add a standalone method to build / remove a specified
list of softwares, using slapos node software --only.

slapos/slap/standalone.py

@@ -466,6 +466,14 @@ class StandaloneSlapOS(object):
             'stdout_logfile':
                 '{self._log_directory}/slapos-node-software.log',
         },
+        'slapos-node-software-only': {
+            'command':
+                '{self._slapos_bin} node software --cfg {self._slapos_config} --only-sr {only_sr} {debug_args}',
+            'debug_args':
+                '-v --buildout-debug',
+            'stdout_logfile':
+                '{self._log_directory}/slapos-node-software.log',
+        },
         'slapos-node-instance': {
             'command':
                 '{self._slapos_bin} node instance --cfg {self._slapos_config} {debug_args}',
@@ -823,6 +831,35 @@ class StandaloneSlapOS(object):
     except SlapOSNodeCommandError as e:
         raise SlapOSNodeSoftwareError(*e.args)
 
+  def waitForSoftwareList(self, software_list, max_retry=0, debug=False, error_lines=30):
+    """Synchronously install or uninstall all softwares in the given list.
+
+    This method retries on errors. If after `max_retry` times there's
+    still an error, the error is raised, containing `error_lines` of output
+    from the buildout command.
+
+    If `debug` is true, buildout is executed in the foreground, with flags to
+    drop in a debugger session if error occurs.
+
+    If `install_all` is true, all softwares will be installed, even the ones
+    for which the installation was already completed. This is equivalent to
+    running `slapos node software --all`.
+
+    Error cases:
+      * `SlapOSNodeSoftwareError` when buildout error while installing software.
+      * Unexpected `Exception` if unable to connect to embedded slap server.
+    """
+    try:
+        return self._runSlapOSCommand(
+            'slapos-node-software-only',
+            max_retry=max_retry,
+            debug=debug,
+            error_lines=error_lines,
+            only_sr=','.join(software_list),
+        )
+    except SlapOSNodeCommandError as e:
+        raise SlapOSNodeSoftwareError(*e.args)
+
   def waitForInstance(self, max_retry=0, debug=False, error_lines=30):
     """Instantiate all partitions previously requested for start.
 
@@ -872,12 +909,12 @@ class StandaloneSlapOS(object):
         raise SlapOSNodeReportError(*e.args)
 
   def _runSlapOSCommand(
-      self, command, max_retry=0, debug=False, error_lines=30):
+      self, command, max_retry=0, debug=False, error_lines=30, **kwargs):
     if debug:
       prog = self._slapos_commands[command]
       # used in format(**locals()) below
       debug_args = prog.get('debug_args', '')  # pylint: disable=unused-variable
-      command = prog['command'].format(**locals())
+      command = prog['command'].format(**dict(locals(), **kwargs))
       try:
         return subprocess.check_call(
             command,