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dbus-launch: add --exit-with-x11 option

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This is more suitable for distributions' Xsession scripts: it verifies
that X is already available, and so never results in an attempt to poll
stdin.

We read the machine UUID because it is needed to set the X atoms.
x11_init() assumes that the machine UUID (global variable) has been
set, either via read_machine_uuid_if_needed() or save_machine_uuid().
This is pretty tangled, but to make The Right Thing happen
automatically, we'd need to redo dbus-launch in terms of DBusError.

Reviewed-by: Will Thompson
Reviewed-by: Thiago Macieira
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=39197
Signed-off-by: Simon McVittie <smcv@debian.org>
This commit is contained in:
Simon McVittie 2016-07-11 12:10:39 +01:00
parent b36708830b
commit b04d9324fb
2 changed files with 61 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

36
doc/dbus-launch.1.xml.in
View file

@ -29,6 +29,7 @@
<arg choice='opt'>--binary-syntax </arg>
<arg choice='opt'>--close-stderr </arg>
<arg choice='opt'>--exit-with-session </arg>
<arg choice='opt'>--exit-with-x11 </arg>
<arg choice='opt'>--autolaunch=<replaceable>MACHINEID</replaceable></arg>
<arg choice='opt'>--config-file=<replaceable>FILENAME</replaceable></arg>
<arg choice='opt'><replaceable>PROGRAM</replaceable></arg>
@ -216,16 +217,35 @@ the --session argument. See the man page for dbus-daemon</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--exit-with-session</option></term>
<listitem>
<para>If this option is provided, a persistent "babysitter" process will be
created that watches stdin for HUP and tries to connect to the X
server. If this process gets a HUP on stdin or loses its X connection,
it kills the message bus daemon.</para>
</listitem>
<varlistentry>
<term><option>--exit-with-x11</option></term>
<listitem>
<para>If this option is provided, a persistent "babysitter" process
will be created, and will connect to the X server. If it cannot
do so, launching fails. If the "babysitter" process loses its
X connection, it kills the message bus daemon, disconnecting
all of its clients (which should exit in response). This avoids
having leftover daemon processes from a user X session, after
the X session has ended.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--exit-with-session</option></term>
<listitem>
<para>
If this option is provided, a persistent "babysitter" process will
be created, as if for --exit-with-x11. If it cannot connect to
the X server, it will monitor the terminal from which dbus-launch
was started instead, and if it gets a HUP on stdin, the message
bus daemon will be killed. This option is not recommended, since
it will consume input from the terminal where it was started;
it is mainly provided for backwards compatibility.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--autolaunch=MACHINEID</option></term>
<listitem>

39
tools/dbus-launch.c
View file

@ -169,7 +169,7 @@ usage (int ecode)
{
fprintf (stderr, "dbus-launch [--version] [--help] [--sh-syntax]"
" [--csh-syntax] [--auto-syntax] [--binary-syntax] [--close-stderr]"
" [--exit-with-session] [--autolaunch=MACHINEID]"
" [--exit-with-session|--exit-with-x11] [--autolaunch=MACHINEID]"
" [--config-file=FILENAME] [PROGRAM] [ARGS...]\n");
exit (ecode);
}
@ -827,6 +827,7 @@ main (int argc, char **argv)
const char *runprog = NULL;
int remaining_args = 0;
int exit_with_session;
int exit_with_x11 = FALSE;
int binary_syntax = FALSE;
int c_shell_syntax = FALSE;
int bourne_shell_syntax = FALSE;
@ -870,6 +871,8 @@ main (int argc, char **argv)
version ();
else if (strcmp (arg, "--exit-with-session") == 0)
exit_with_session = TRUE;
else if (strcmp (arg, "--exit-with-x11") == 0)
exit_with_x11 = TRUE;
else if (strcmp (arg, "--close-stderr") == 0)
close_stderr = TRUE;
else if (strstr (arg, "--autolaunch=") == arg)
@ -981,6 +984,9 @@ main (int argc, char **argv)
if (exit_with_session)
verbose ("--exit-with-session enabled\n");
if (exit_with_x11)
verbose ("--exit-with-x11 enabled\n");
if (autolaunch)
{
#ifndef DBUS_BUILD_X11
@ -1035,10 +1041,10 @@ main (int argc, char **argv)
}
verbose ("Autolaunch enabled (using X11).\n");
if (!exit_with_session)
if (!exit_with_x11)
{
verbose ("--exit-with-session automatically enabled\n");
exit_with_session = TRUE;
verbose ("--exit-with-x11 automatically enabled\n");
exit_with_x11 = TRUE;
}
if (!x11_init ())
@ -1061,12 +1067,33 @@ main (int argc, char **argv)
exit (0);
}
#endif /* DBUS_ENABLE_X11_AUTOLAUNCH */
#endif /* DBUS_BUILD_X11 */
}
else if (exit_with_x11)
{
#ifndef DBUS_BUILD_X11
fprintf (stderr, "Session lifetime based on X11 requested, but X11 support not compiled in.\n");
exit (1);
#else /* DBUS_BUILD_X11 */
if (!read_machine_uuid_if_needed())
{
fprintf (stderr, "Session lifetime based on X11 requested, but machine UUID unavailable.\n");
exit (1);
}
if (!x11_init ())
{
fprintf (stderr, "Session lifetime based on X11 requested, but X11 initialization failed.\n");
exit (1);
}
#endif /* DBUS_BUILD_X11 */
}
#ifdef DBUS_BUILD_X11
else if (read_machine_uuid_if_needed())
{
x11_init();
#endif /* DBUS_BUILD_X11 */
}
#endif /* DBUS_BUILD_X11 */
if (pipe (bus_pid_to_launcher_pipe) < 0 ||
@ -1128,7 +1155,7 @@ main (int argc, char **argv)
* and will also reap the pre-forked bus
* daemon
*/
babysit (exit_with_session, ret,
babysit (exit_with_session || exit_with_x11, ret,
bus_pid_to_babysitter_pipe[READ_END]);
exit (0);
}