class_docstr: path implementation that offers access to (possibly remote) subversion
  repositories. 
docstr: ensure that an args-joined path exists (by default as
  a file). If you specify a keyword argument 'dir=True'
  then the path is forced to be a directory path.
code: def ensure(self, *args, **kwargs):
      """ensure that an args-joined path exists (by default as
      a file). If you specify a keyword argument 'dir=True'
      then the path is forced to be a directory path.
      """
      if getattr(self, "rev", None) is not None:
          raise py.error.EINVAL(self, "revisions are immutable")
      target = self.join(*args)
      dir = kwargs.get("dir", 0)
      for x in target.parts(reverse=True):
          if x.check():
              break
      else:
          raise py.error.ENOENT(target, "has not any valid base!")
      if x == target:
          if not x.check(dir=dir):
              raise dir and py.error.ENOTDIR(x) or py.error.EISDIR(x)
          return x
      tocreate = target.relto(x)
      basename = tocreate.split(self.sep, 1)[0]
      tempdir = py.path.local.mkdtemp()
      try:
          tempdir.ensure(tocreate, dir=dir)
          cmd = 'svn import -m "%s" "%s" "%s"' % (
              "ensure %s" % self._escape(tocreate),
              self._escape(tempdir.join(basename)),
              x.join(basename)._encodedurl(),
          )
          self._svncmdexecauth(cmd)
          self._norev_delentry(x)
      finally:
          tempdir.remove()
      return target
  
imports: import os, sys, time, re
  import py
  from py import path, process
  from py._path import common
  from py._path import svnwc
  from py._path.cacheutil import BuildcostAccessCache, AgingCache
label_desc: Use image node_id 18 for calling the SvnCommandPath obj's underlying member method code with example usage: obj.ensure() and returns: target, x