lib/mv/plugins/dovecot.rb

   1 require 'fileutils'
   2
   3 require 'common/filesystem'
   4 require 'common/dovecot_plugin'
   5 require 'mv/mv_plugin'
   6
   7 class DovecotMv
   8
   9   include DovecotPlugin
  10   include MvPlugin
  11
  12   def mv_user(src, dst)
  13     # It's obviously an error if the source user does not exist.
  14     raise NonexistentUserError.new(src.to_s()) if not user_exists(src)
  15
  16     # And it's an error if the destination user exists already.
  17     raise UserAlreadyExistsError.new(dst.to_s()) if user_exists(dst)
  18
  19     # But is it an error if the target domain does not exist? That's a
  20     # bit subtle... The domain may exist in the database, but if it
  21     # has not received any mail yet, then its directory won't exist
  22     # on-disk.
  23     #
  24     # There are two possible "oops" scenarios resulting from the fact
  25     # that we may run either the Postfixadmin move first or the
  26     # Dovecot move first. If we move the user in the database, we
  27     # definitely want to move him on disk (that is, we should create
  28     # the directory here). But if we move him on disk first, then we
  29     # don't know if the database move will fail! We don't want to move
  30     # his mail files if he won't get moved in the database.
  31     #
  32     # Faced with two equally-bad (but easy-to-fix) options, we do the
  33     # simplest thing and fail if the destination domain directory
  34     # doesn't exist. If nothing else, this is at least consistent.
  35     if not self.domain_exists(dst.domain()) then
  36       raise NonexistentDomainError.new(dst.domainpart())
  37     end
  38
  39     # We may need to create the target domain directory, even if the
  40     # domain exists in the database.
  41     FileUtils.mkdir_p(self.get_domain_path(dst.domain()))
  42
  43     # The parent of dst_path exists because we just created it.The
  44     # source path should exist too, because the "source user" does,
  45     # and, well, how did we determine that?
  46     src_path = self.get_user_path(src)
  47     dst_path = self.get_user_path(dst)
  48     FileUtils.mv(src_path, dst_path)
  49   end
  50
  51 end