+
+
+class IAllocatorRunner(object):
+ """IAllocator runner.
+
+ This class is instantiated on the node side (ganeti-noded) and not on
+ the master side.
+
+ """
+ def Run(self, name, idata):
+ """Run an iallocator script.
+
+ Return value: tuple of:
+ - run status (one of the IARUN_ constants)
+ - stdout
+ - stderr
+ - fail reason (as from utils.RunResult)
+
+ """
+ alloc_script = utils.FindFile(name, constants.IALLOCATOR_SEARCH_PATH,
+ os.path.isfile)
+ if alloc_script is None:
+ return (constants.IARUN_NOTFOUND, None, None, None)
+
+ fd, fin_name = tempfile.mkstemp(prefix="ganeti-iallocator.")
+ try:
+ os.write(fd, idata)
+ os.close(fd)
+ result = utils.RunCmd([alloc_script, fin_name])
+ if result.failed:
+ return (constants.IARUN_FAILURE, result.stdout, result.stderr,
+ result.fail_reason)
+ finally:
+ os.unlink(fin_name)
+
+ return (constants.IARUN_SUCCESS, result.stdout, result.stderr, None)
+
+
+class DevCacheManager(object):
+ """Simple class for managing a cache of block device information.
+
+ """
+ _DEV_PREFIX = "/dev/"
+ _ROOT_DIR = constants.BDEV_CACHE_DIR
+
+ @classmethod
+ def _ConvertPath(cls, dev_path):
+ """Converts a /dev/name path to the cache file name.
+
+ This replaces slashes with underscores and strips the /dev
+ prefix. It then returns the full path to the cache file
+
+ """
+ if dev_path.startswith(cls._DEV_PREFIX):
+ dev_path = dev_path[len(cls._DEV_PREFIX):]
+ dev_path = dev_path.replace("/", "_")
+ fpath = "%s/bdev_%s" % (cls._ROOT_DIR, dev_path)
+ return fpath
+
+ @classmethod
+ def UpdateCache(cls, dev_path, owner, on_primary, iv_name):
+ """Updates the cache information for a given device.
+
+ """
+ if dev_path is None:
+ logger.Error("DevCacheManager.UpdateCache got a None dev_path")
+ return
+ fpath = cls._ConvertPath(dev_path)
+ if on_primary:
+ state = "primary"
+ else:
+ state = "secondary"
+ if iv_name is None:
+ iv_name = "not_visible"
+ fdata = "%s %s %s\n" % (str(owner), state, iv_name)
+ try:
+ utils.WriteFile(fpath, data=fdata)
+ except EnvironmentError, err:
+ logger.Error("Can't update bdev cache for %s, error %s" %
+ (dev_path, str(err)))
+
+ @classmethod
+ def RemoveCache(cls, dev_path):
+ """Remove data for a dev_path.
+
+ """
+ if dev_path is None:
+ logger.Error("DevCacheManager.RemoveCache got a None dev_path")
+ return
+ fpath = cls._ConvertPath(dev_path)
+ try:
+ utils.RemoveFile(fpath)
+ except EnvironmentError, err:
+ logger.Error("Can't update bdev cache for %s, error %s" %
+ (dev_path, str(err)))