initscript.py

   1 import os, os.path
   2 import tools
   3
   4 import logger
   5
   6 class Initscript:
   7
   8     def __init__ (self, name):
   9         self.name=name
  10         self.initscript = ''
  11
  12     def configure (self, rec):
  13 #        logger.log("Initscript.configure")
  14         new_initscript = rec['initscript']
  15         if new_initscript != self.initscript:
  16             self.initscript = new_initscript
  17             # not used anymore, we always check against the installed script
  18             #self.initscriptchanged = True
  19             self.refresh_slice_vinit()
  20
  21     def install_and_enable_vinit (self):
  22         "prepare sliver rootfs init and systemd so the vinit service kicks in"
  23         # the fact that systemd attempts to run old-style services
  24         # says we should do either one or the other and not both
  25         # but actually if that was true we could just do it for init and be fine
  26         # which is not what we've seen starting with f18
  27         # so we try for a systemd system, and if it fails it means
  28         # one of the dir does not exist and so we are dealing with an init-based rootfs
  29         try:    self.install_and_enable_vinit_for_systemd ()
  30         except: self.install_and_enable_vinit_for_init ()
  31
  32     # unconditionnally install and enable the generic vinit script
  33     # mimicking chkconfig for enabling the generic vinit script
  34     # this is hardwired for runlevel 3
  35     def install_and_enable_vinit_for_init (self):
  36         "suitable for init-based VMs"
  37         vinit_source="/usr/share/NodeManager/sliver-initscripts/vinit"
  38         vinit_script="/vservers/%s/etc/rc.d/init.d/vinit"%self.name
  39         enable_link="/vservers/%s/etc/rc.d/rc3.d/S99vinit"%self.name
  40         enable_target="../init.d/vinit"
  41         # install in sliver
  42         code=file(vinit_source).read()
  43         if tools.replace_file_with_string(vinit_script,code,chmod=0755):
  44             logger.log("Initscript: %s: installed generic vinit rc script"%self.name)
  45         # create symlink for runlevel 3
  46         if not os.path.islink(enable_link):
  47             try:
  48                 logger.log("Initscript: %s: creating runlevel3 symlink %s"%(self.name,enable_link))
  49                 os.symlink(enable_target,enable_link)
  50             except:
  51                 logger.log_exc("Initscript failed to create runlevel3 symlink %s"%enable_link,name=self.name)
  52
  53     # very similar but with systemd unit files - we target 'multi-user' in this context
  54     def install_and_enable_vinit_for_systemd(self):
  55         "suitable for systemd-based VMs"
  56         vinit_source="/usr/share/NodeManager/sliver-systemd/vinit.service"
  57         vinit_unit_file="/vservers/%s/usr/lib/systemd/system/vinit.service"%self.name
  58         enable_link="/vservers/%s/etc/systemd/system/multi-user.target.wants/vinit.service"%self.name
  59         enable_target="/usr/lib/systemd/system/vinit.service"
  60         # install in sliver
  61         code=file(vinit_source).read()
  62         if tools.replace_file_with_string(vinit_unit_file,code,chmod=0755):
  63             logger.log("Initscript: %s: installed vinit.service unit file"%self.name)
  64         # create symlink for enabling this unit
  65         if not os.path.islink(enable_link):
  66             try:
  67                 logger.log("Initscript: %s: creating enabling symlink %s"%(self.name,enable_link))
  68                 os.symlink(enable_target,enable_link)
  69             except:
  70                 logger.log_exc("Initscript failed to create enabling symlink %s"%enable_link,name=name)
  71
  72
  73 #ln -s '/usr/lib/systemd/system/vinit.service' '/etc/systemd/system/multi-user.target.wants/vinit.service'
  74
  75
  76     # install or remove the slice inistscript, as instructed by the initscript tag
  77     def refresh_slice_vinit(self):
  78         code=self.initscript
  79         sliver_initscript="/vservers/%s/etc/rc.d/init.d/vinit.slice"%self.name
  80         if tools.replace_file_with_string(sliver_initscript,code,remove_if_empty=True,chmod=0755):
  81             if code:
  82                 logger.log("Initscript: %s: Installed new initscript in %s"%(self.name,sliver_initscript))
  83                 if self.is_running():
  84                     # Only need to rerun the initscript if the vserver is
  85                     # already running. If the vserver isn't running, then the
  86                     # initscript will automatically be started by
  87                     # /etc/rc.d/vinit when the vserver is started.
  88                     self.rerun_slice_vinit()
  89             else:
  90                 logger.log("Initscript: %s: Removed obsolete initscript %s"%(self.name,sliver_initscript))
  91