Fix slapos node prune usages with root slapos

- also write pid file to prevent race condition
 - check user is root

See merge request nexedi/slapos.core!267

slapos/cli/prune.py

@@ -32,9 +32,11 @@ import glob
 import os
 import six.moves.configparser as configparser
 
+from slapos.cli.command import check_root_user
 from slapos.cli.config import ConfigCommand
 from slapos.grid.slapgrid import merged_options
-from slapos.util import rmtree
+from slapos.grid.utils import setRunning, setFinished
+from slapos.util import rmtree, string_to_boolean
 
 
 class PruneCommand(ConfigCommand):
@@ -60,13 +62,22 @@ class PruneCommand(ConfigCommand):
       self.app.log.error('No shared_part_list options in slapos config')
       sys.exit(-1)
 
+    if string_to_boolean(options.get('root_check', 'True').lower()):
+      check_root_user(self)
+
     pidfile_software = options.get('pidfile_software')
     if not args.dry_run and pidfile_software and os.path.exists(
         pidfile_software):
       self.app.log.error('Cannot prune while software is running')
       sys.exit(-1)
 
-    sys.exit(do_prune(self.app.log, options, args.dry_run))
+    if pidfile_software:
+      setRunning(logger=self.app.log, pidfile=pidfile_software)
+    try:
+      do_prune(self.app.log, options, args.dry_run)
+    finally:
+      if pidfile_software:
+        setFinished(pidfile_software)
 
 
 def _prune(

slapos/tests/test_cli.py

@@ -399,6 +399,28 @@ class TestCliNode(CliMixin):
           pidfile='/opt/slapos/slapgrid-cp.pid')
       processComputerPartitionList.assert_called_once()
 
+  def test_node_prune(self):
+    """slapos node prune command
+    """
+    app = slapos.cli.entry.SlapOSApp()
+
+    with patch('slapos.cli.prune.check_root_user', return_value=True) as checked_root_user, \
+         patch('slapos.cli.prune.setRunning') as write_pid_file, \
+         patch('slapos.cli.prune.merged_options', return_value={
+            'shared_part_list': 'something',
+            'root_check': 'true',
+            'pidfile_software': 'pidfile_software.pid',
+         }), \
+         patch('slapos.cli.prune.do_prune') as do_prune:
+
+      app.run(('node', 'prune'))
+
+      checked_root_user.assert_called_once()
+      write_pid_file.assert_called_once_with(
+          logger=mock.ANY,
+          pidfile='pidfile_software.pid')
+      do_prune.assert_called_once()
+
 
 class TestCliList(CliMixin):
   def test_list(self):