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Throw an error in case of unsupported session type

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When launching a GNOME session from a text-mode VT, the logind session
type is unlikely to be set to either "wayland" or "x11". We search for a
supported session type first with logind and then with
$XDG_SESSION_TYPE. As a fallback, we also test $DISPLAY in case of a
"tty" logind session to support starting through xinit. Ideally, such
setups should set XDG_SESSION_TYPE=x11.
If no supported session type is found, we throw an error.

https://bugzilla.gnome.org/show_bug.cgi?id=759388
This commit is contained in:
Jouke Witteveen 2016-06-27 12:51:15 +02:00 committed by Jonas Ådahl
parent b5e797f453
commit 4ed59a020d
1 changed files with 56 additions and 35 deletions
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79
src/core/main.c
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@ -304,33 +304,40 @@ on_sigterm (gpointer user_data)
}
#if defined(HAVE_WAYLAND) && defined(HAVE_NATIVE_BACKEND)
static char *
find_logind_session_type (void)
static gboolean
session_type_is_supported (const char *session_type)
{
char **sessions;
return (g_strcmp0 (session_type, "x11") == 0) ||
(g_strcmp0 (session_type, "wayland") == 0);
}
static char *
find_session_type (void)
{
char **sessions = NULL;
char *session_id;
char *session_type;
const char *session_type_env;
gboolean is_tty = FALSE;
int ret, i;
ret = sd_pid_get_session (0, &session_id);
if (ret == 0 && session_id != NULL)
{
ret = sd_session_get_type (session_id, &session_type);
free (session_id);
if (ret < 0)
session_type = NULL;
if (ret == 0)
{
if (session_type_is_supported (session_type))
goto out;
else
is_tty = g_strcmp0 (session_type, "tty") == 0;
free (session_type);
}
session_type = NULL;
ret = sd_uid_get_sessions (getuid (), TRUE, &sessions);
if (ret < 0 || sessions == NULL)
goto out;
}
else if (sd_uid_get_sessions (getuid (), 1, &sessions) > 0)
{
for (i = 0; sessions[i] != NULL; i++)
{
ret = sd_session_get_type (sessions[i], &session_type);
@ -338,16 +345,34 @@ find_logind_session_type (void)
if (ret < 0)
continue;
if (g_strcmp0 (session_type, "x11") == 0||
g_strcmp0 (session_type, "wayland") == 0)
break;
g_clear_pointer (&session_type, (GDestroyNotify) free);
if (session_type_is_supported (session_type))
{
g_strfreev (sessions);
goto out;
}
for (i = 0; sessions[i] != NULL; i++)
free (sessions[i]);
free (sessions);
free (session_type);
}
}
g_strfreev (sessions);
session_type_env = g_getenv ("XDG_SESSION_TYPE");
if (session_type_is_supported (session_type_env))
{
/* The string should be freeable */
session_type = strdup (session_type_env);
goto out;
}
/* Legacy support for starting through xinit */
if (is_tty && (g_getenv ("MUTTER_DISPLAY") || g_getenv ("DISPLAY")))
{
session_type = strdup ("x11");
goto out;
}
meta_warning ("Unsupported session type\n");
meta_exit (META_EXIT_ERROR);
out:
return session_type;
@ -356,16 +381,12 @@ out:
static gboolean
check_for_wayland_session_type (void)
{
char *session_type = NULL;
gboolean is_wayland = FALSE;
char *session_type;
gboolean is_wayland;
session_type = find_logind_session_type ();
if (session_type != NULL)
{
session_type = find_session_type ();
is_wayland = g_strcmp0 (session_type, "wayland") == 0;
free (session_type);
}
return is_wayland;
}