pre-delete pluging: update to naming conventions, add more tests

This pluging can be used a add a script which wipe data before the partition is removed
The script run after all partition services are stopped. The script is ran by supervisord
then slapos node report will wait until it finish before destroy the partition.

/reviewed-on !23

slapos/grid/SlapObject.py

@@ -354,6 +354,7 @@ class Partition(object):
     self.instance_path = instance_path
     self.run_path = os.path.join(self.instance_path, 'etc', 'run')
     self.service_path = os.path.join(self.instance_path, 'etc', 'service')
+    self.prerm_path = os.path.join(self.instance_path, 'etc', 'prerm')
     self.supervisord_partition_configuration_path = \
         supervisord_partition_configuration_path
     self.supervisord_socket = supervisord_socket
@@ -453,16 +454,18 @@ class Partition(object):
               'USER': pwd.getpwuid(uid).pw_name,
           }
 
-  def addServiceToCustomGroup(self, group_id, runner_list, path):
+  def addServiceToCustomGroup(self, group_suffix, partition_id, runner_list,
+      path, extension=''):
     """Add new services to supervisord that belong to specific group"""
     group_partition_template = pkg_resources.resource_stream(__name__,
       'templates/group_partition_supervisord.conf.in').read()
-    self.supervisor_configuration_groups += group_partition_template % {
+    group_id = '-'.join([partition_id, group_suffix])
+    self.supervisor_configuration_group += group_partition_template % {
         'instance_id': group_id,
         'program_list': ','.join(['_'.join([group_id, runner])
                                   for runner in runner_list])
     }
-    return self.addServiceToGroup(group_id, runner_list, path)
+    return self.addServiceToGroup(group_id, runner_list, path, extension)
 
   def updateSymlink(self, sr_symlink, software_path):
     if os.path.lexists(sr_symlink):
@@ -612,7 +615,7 @@ class Partition(object):
     runner_list = []
     service_list = []
     self.partition_supervisor_configuration = ""
-    self.supervisor_configuration_groups = ""
+    self.supervisor_configuration_group = ""
     if os.path.exists(self.run_path):
       if os.path.isdir(self.run_path):
         runner_list = os.listdir(self.run_path)
@@ -628,7 +631,7 @@ class Partition(object):
       partition_id = self.computer_partition.getId()
       group_partition_template = pkg_resources.resource_stream(__name__,
           'templates/group_partition_supervisord.conf.in').read()
-      self.supervisor_configuration_groups = group_partition_template % {
+      self.supervisor_configuration_group = group_partition_template % {
           'instance_id': partition_id,
           'program_list': ','.join(['_'.join([partition_id, runner])
                                     for runner in runner_list + service_list])
@@ -642,10 +645,10 @@ class Partition(object):
     """
       Write supervisord configuration file and update supervisord
     """
-    if self.supervisor_configuration_groups and \
+    if self.supervisor_configuration_group and \
         self.partition_supervisor_configuration:
       updateFile(self.supervisord_partition_configuration_path,
-                 self.supervisor_configuration_groups +
+                 self.supervisor_configuration_group +
                  self.partition_supervisor_configuration)
     self.updateSupervisor()
 

slapos/grid/slapgrid.py

@@ -80,7 +80,7 @@ PROMISE_TIMEOUT = 3
 COMPUTER_PARTITION_TIMESTAMP_FILENAME = '.timestamp'
 COMPUTER_PARTITION_LATEST_BANG_TIMESTAMP_FILENAME = '.slapos_latest_bang_timestamp'
 COMPUTER_PARTITION_INSTALL_ERROR_FILENAME = '.slapgrid-%s-error.log'
-COMPUTER_PARTITION_WAIT_LIST_FILENAME = '.slapos-wait-services'
+COMPUTER_PARTITION_WAIT_LIST_FILENAME = '.slapos-report-wait-service-list'
 
 # XXX hardcoded watchdog_path
 WATCHDOG_PATH = '/opt/slapos/bin/slapos-watchdog'
@@ -1273,7 +1273,7 @@ stderr_logfile_backups=1
 
     if os.path.exists(wait_file) and os.path.isfile(wait_file):
       with open(wait_file) as wait_f:
-        processes_list = [name.strip() for name in wait_f.readlines() if name]
+        processes_list = [name.strip() for name in wait_f if name]
         # return True if one of process in the list is running
         return partition.checkProcessesFromStateList(processes_list,
                                                      state_list)

slapos/manager/predestroy.py → slapos/manager/prerm.py

@@ -9,7 +9,6 @@ from slapos.manager import interface
 from slapos.grid.slapgrid import COMPUTER_PARTITION_WAIT_LIST_FILENAME
 
 logger = logging.getLogger(__name__)
-WIPE_WRAPPER_BASE_PATH = "var/run/slapos/pre-destroy/"
 
 class Manager(object):
   """Manager is called in every step of preparation of the computer."""
@@ -45,32 +44,31 @@ class Manager(object):
 
     wait_filepath = os.path.join(partition.instance_path,
                                  COMPUTER_PARTITION_WAIT_LIST_FILENAME)
-    wipe_base_folder = os.path.join(partition.instance_path,
-                                    WIPE_WRAPPER_BASE_PATH)
-    if not os.path.exists(wipe_base_folder):
+    if not os.path.exists(partition.prerm_path):
       return
-    wipe_wrapper_list = [f for f in os.listdir(wipe_base_folder)
-                         if os.path.isfile(os.path.join(wipe_base_folder, f))]
-    if len(wipe_wrapper_list) > 0:
-      group_name = partition.partition_id + '-' + "destroy"
-      logger.info("Adding pre-destroy scripts to supervisord...")
+    partition_id = partition.partition_id
+    wrapper_list = [f for f in os.listdir(partition.prerm_path)
+                    if os.path.isfile(os.path.join(partition.prerm_path, f))]
+    if len(wrapper_list) > 0:
+      group_suffix = "prerm"
+      logger.info("Adding pre-delete scripts to supervisord...")
       partition.generateSupervisorConfiguration()
-      partition.addServiceToCustomGroup(group_name,
-                                        wipe_wrapper_list,
-                                        wipe_base_folder)
-  
+      partition.addServiceToCustomGroup(group_suffix,
+                                        partition_id,
+                                        wrapper_list,
+                                        partition.prerm_path)
       partition.writeSupervisorConfigurationFile()
 
       # check the state of all process, if the process is not started yes, start it
       supervisord = partition.getSupervisorRPC()
       process_list_string = ""
-      for name in wipe_wrapper_list:
-        process_name = group_name + ':' + name
-        process_list_string += process_name + '\n'
+      for name in wrapper_list:
+        process_name = '-'.join([partition_id, group_suffix]) + ':' + name
+        process_list_string += '%s\n' % process_name
         status = supervisord.getProcessInfo(process_name)
         if status['start'] == 0:
           # process is not started yet
-          logger.info("Starting pre-destroy process %r..." % name)
+          logger.info("Starting pre-delete process %r..." % name)
           supervisord.startProcess(process_name, False)
 
       # ask to slapgrid to check theses scripts before destroy partition