From cb383867cf25237e02b046669e6be237983d60ab Mon Sep 17 00:00:00 2001
From: Paul Wolneykien <manowar@altlinux.org>
Date: Mon, 12 Aug 2019 17:35:55 +0300
Subject: [PATCH] Use the first available session config as default

If there is no "default.desktop" session then use the first available
.desktop file as default.

Signed-off-by: Paul Wolneykien <manowar@altlinux.org>
---
 src/seat.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/src/seat.c b/src/seat.c
index b1850332a..2f500f87b 100644
--- a/src/seat.c
+++ b/src/seat.c
@@ -12,6 +12,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/wait.h>
+#include <config.h>
 
 #include "seat.h"
 #include "configuration.h"
@@ -946,6 +947,41 @@ get_session_argv (Seat *seat, SessionConfig *session_config, const gchar *sessio
     return g_steal_pointer (&argv);
 }
 
+static SessionConfig *
+find_default_session_config (Seat *seat, const gchar *sessions_dir)
+{
+    g_return_val_if_fail (sessions_dir != NULL, NULL);
+
+    g_auto(GStrv) dirs = g_strsplit (sessions_dir, ":", -1);
+    for (int i = 0; dirs[i]; i++)
+    {
+        const gchar *default_session_type = "x";
+        if (strcmp (dirs[i], WAYLAND_SESSIONS_DIR) == 0)
+            default_session_type = "wayland";
+
+        g_autoptr(GError) error = NULL;
+        GDir *directory = g_dir_open (dirs[i], 0, &error);
+        if (error && !g_error_matches (error, G_FILE_ERROR, G_FILE_ERROR_NOENT))
+            g_warning ("Failed to open sessions directory: %s", error->message);
+
+        if (directory)
+        {
+            const gchar *filename;
+            while ((filename = g_dir_read_name (directory)))
+            {
+                if (!g_str_has_suffix (filename, ".desktop"))
+                    continue;
+                g_autofree gchar *path = g_build_filename (dirs[i], filename, NULL);
+                SessionConfig *session_config = session_config_new_from_file (path, default_session_type, &error);
+                if (session_config)
+                    return session_config;
+            }
+        }
+    }
+
+    return NULL;
+}
+
 static SessionConfig *
 find_session_config (Seat *seat, const gchar *sessions_dir, const gchar *session_name)
 {
@@ -967,6 +1003,13 @@ find_session_config (Seat *seat, const gchar *sessions_dir, const gchar *session
             return session_config;
     }
 
+    if (0 == g_strcmp0 (session_name, DEFAULT_USER_SESSION))
+    {
+        SessionConfig *session_config = find_default_session_config (seat, sessions_dir);
+        if (session_config)
+            return session_config;
+    }
+
     l_debug (seat, "Failed to find session configuration %s", session_name);
 
     return NULL;