Question

我有一个成功运行系统总线的嵌入式目标和dbus-daemon。我试图使会话总线也能正常运行，但是尝试时会出现此错误，

usr/bin/dbus-daemon --session &

[/etc/dbus-1]# /usr/bin/dbus-daemon --session &
[/etc/dbus-1]# Failed to start message bus: Circular inclusion of file '/etc/dbus-1/session.conf'

dbus-daemon的版本是1.10.22，我包括了/etc/dbus-1/session.conf。目标上只有一个root用户，这就是我的运行方式。我自然会认为我在session.conf文件中搞砸了，但是“循环包含”似乎暗示着该文件之外的东西出了问题。

我尝试调试的过程涉及查看d-bus源，但是到目前为止，我还没有找到任何地方。

<!-- This configuration file controls the per-user-login-session message bus.
     Add a session-local.conf and edit that rather than changing this 
     file directly. -->

<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-Bus Bus Configuration 1.0//EN"
 "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>
  <!-- Our well-known bus type, don't change this -->
  <type>session</type>

  <!-- If we fork, keep the user's original umask to avoid affecting
       the behavior of child processes. -->
  <keep_umask/>

  <listen>unix:path=/var/run/dbus/session_bus_socket</listen>

  <!-- On Unix systems, the most secure authentication mechanism is
  EXTERNAL, which uses credential-passing over Unix sockets.

  This authentication mechanism is not available on Windows,
  is not suitable for use with the tcp: or nonce-tcp: transports,
  and will not work on obscure flavours of Unix that do not have
  a supported credentials-passing mechanism. On those platforms/transports,
  comment out the <auth> element to allow fallback to DBUS_COOKIE_SHA1. -->
  <auth>EXTERNAL</auth>

  <standard_session_servicedirs />

  <policy context="default">
    <!-- Allow everything to be sent -->
    <allow send_destination="*" eavesdrop="true"/>
    <!-- Allow everything to be received -->
    <allow eavesdrop="true"/>
    <!-- Allow anyone to own anything -->
    <allow own="*"/>
  </policy>

  <!-- Include legacy configuration location -->
  <include ignore_missing="yes">/etc/dbus-1/session.conf</include>

  <!-- Config files are placed here that among other things, 
       further restrict the above policy for specific services. -->
  <includedir>session.d</includedir>

  <includedir>/etc/dbus-1/session.d</includedir>

  <!-- This is included last so local configuration can override what's 
       in this standard file -->
  <include ignore_missing="yes">/etc/dbus-1/session-local.conf</include>

  <include if_selinux_enabled="yes" selinux_root_relative="yes">contexts/dbus_contexts</include>

  <!-- For the session bus, override the default relatively-low limits 
       with essentially infinite limits, since the bus is just running 
       as the user anyway, using up bus resources is not something we need 
       to worry about. In some cases, we do set the limits lower than 
       "all available memory" if exceeding the limit is almost certainly a bug, 
       having the bus enforce a limit is nicer than a huge memory leak. But the 
       intent is that these limits should never be hit. -->

  <!-- the memory limits are 1G instead of say 4G because they can't exceed 32-bit signed int max -->
  <limit name="max_incoming_bytes">1000000000</limit>
  <limit name="max_incoming_unix_fds">250000000</limit>
  <limit name="max_outgoing_bytes">1000000000</limit>
  <limit name="max_outgoing_unix_fds">250000000</limit>
  <limit name="max_message_size">1000000000</limit>
  <!-- We do not override max_message_unix_fds here since the in-kernel
       limit is also relatively low -->
  <limit name="service_start_timeout">120000</limit>  
  <limit name="auth_timeout">240000</limit>
  <limit name="pending_fd_timeout">150000</limit>
  <limit name="max_completed_connections">100000</limit>  
  <limit name="max_incomplete_connections">10000</limit>
  <limit name="max_connections_per_user">100000</limit>
  <limit name="max_pending_service_starts">10000</limit>
  <limit name="max_names_per_connection">50000</limit>
  <limit name="max_match_rules_per_connection">50000</limit>
  <limit name="max_replies_per_connection">50000</limit>

</busconfig>

Answer 1

循环包含问题是由您在/etc/dbus-1/session.conf中包含/etc/dbus-1/session.conf引起的。删除行：

<!-- Include legacy configuration location -->
<include ignore_missing="yes">/etc/dbus-1/session.conf</include>

dbus-daemon --session给出循环包含错误

1 个答案: