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g_dbus_address_connect: specifically use dbus-launch for autolaunch:

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This only alters what happens if we specifically connect to
"autolaunch:", for instance via "DBUS_SESSION_BUS_ADDRESS=autolaunch:".
We will still potentially try other platform-specific things if
DBUS_SESSION_BUS_ADDRESS is unset. There are currently no other
platform-specific things, so there is no practical difference yet,
but I'm about to add a more-preferred fallback path before autolaunch.

This matches libdbus' behaviour and the D-Bus Specification, in which
the autolaunch: transport specifically means X11 autolaunch
(as implemented by "dbus-launch --autolaunch") on Unix, or a
shared-memory-based protocol on Windows. Other platform-specific
transports or default/fallback modes, including launchd on Mac OS X
and XDG_RUNTIME_DIR/bus on Unix, are not part of "autolaunch:".

It's rather unfortunate that the same name means two different
platform-specific mechanisms, specific to different platforms -
if they were added today I'd call them x11: and windows-shm: or
something - but it's been like this since 2007 so it's too late now.

Bug: https://bugzilla.gnome.org/show_bug.cgi?id=747941
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Reviewed-by: Philip Withnall <philip.withnall@collabora.co.uk>
This commit is contained in:
Simon McVittie 2015-04-15 19:59:50 +01:00
parent bf181a3ac7
commit 0d3f56e31c
1 changed files with 21 additions and 17 deletions
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38
gio/gdbusaddress.c
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@ -64,6 +64,7 @@
*/
static gchar *get_session_address_platform_specific (GError **error);
static gchar *get_session_address_dbus_launch (GError **error);
/* ---------------------------------------------------------------------------------------------------- */
@ -638,7 +639,7 @@ g_dbus_address_connect (const gchar *address_entry,
else if (g_strcmp0 (address_entry, "autolaunch:") == 0)
{
gchar *autolaunch_address;
autolaunch_address = get_session_address_platform_specific (error);
autolaunch_address = get_session_address_dbus_launch (error);
if (autolaunch_address != NULL)
{
ret = g_dbus_address_try_connect_one (autolaunch_address, NULL, cancellable, error);
@ -1113,9 +1114,9 @@ get_session_address_dbus_launch (GError **error)
g_free (old_dbus_verbose);
return ret;
}
#endif
#ifdef G_OS_WIN32
/* end of G_OS_UNIX case */
#elif defined(G_OS_WIN32)
#define DBUS_DAEMON_ADDRESS_INFO "DBusDaemonAddressInfo"
#define DBUS_DAEMON_MUTEX "DBusDaemonMutex"
@ -1413,26 +1414,29 @@ get_session_address_dbus_launch (GError **error)
return address;
}
#endif
#else /* neither G_OS_UNIX nor G_OS_WIN32 */
static gchar *
get_session_address_dbus_launch (GError **error)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_FAILED,
_("Cannot determine session bus address (not implemented for this OS)"));
return NULL;
}
#endif /* neither G_OS_UNIX nor G_OS_WIN32 */
/* ---------------------------------------------------------------------------------------------------- */
static gchar *
get_session_address_platform_specific (GError **error)
{
gchar *ret;
#if defined (G_OS_UNIX) || defined(G_OS_WIN32)
/* need to handle OS X in a different way since 'dbus-launch --autolaunch' probably won't work there */
ret = get_session_address_dbus_launch (error);
#else
/* TODO: implement for OS X */
ret = NULL;
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_FAILED,
_("Cannot determine session bus address (not implemented for this OS)"));
#endif
return ret;
/* TODO (#694472): try launchd on OS X, like
* _dbus_lookup_session_address_launchd() does, since
* 'dbus-launch --autolaunch' probably won't work there
*/
return get_session_address_dbus_launch (error);
}
/* ---------------------------------------------------------------------------------------------------- */