gnu: lightdm: Apply patch to allow using VNC options.

* gnu/packages/patches/lightdm-arguments-ordering.patch: New patch.
* gnu/local.mk (dist_patch_DATA): Register it.
* gnu/packages/display-managers.scm (lightdm): Apply it.

1 files changed, 54 insertions, 0 deletions

diff --git a/gnu/packages/patches/lightdm-arguments-ordering.patch b/gnu/packages/patches/lightdm-arguments-ordering.patch
new file mode 100644
index 0000000000..c3b513a19a
--- /dev/null
+++ b/gnu/packages/patches/lightdm-arguments-ordering.patch
@@ -0,0 +1,54 @@
+When providing the VNCServer command as 'Xvnc -SecurityTypes None',
+the formatted command line used would look like:
+
+  Xvnc  -SecurityTypes None :1 -auth /var/run/lightdm/root/:1
+
+which is invalid (the display number must appear first).
+
+Submitted upstream at: https://github.com/canonical/lightdm/pull/265
+
+ src/x-server-local.c | 14 +++++++++++++-
+ 1 file changed, 13 insertions(+), 1 deletion(-)
+
+diff --git a/src/x-server-local.c b/src/x-server-local.c
+index 7c4ab870..6c540d18 100644
+--- a/src/x-server-local.c
++++ b/src/x-server-local.c
+@@ -463,14 +463,20 @@ x_server_local_start (DisplayServer *display_server)
+     l_debug (display_server, "Logging to %s", log_file);
+ 
+     g_autofree gchar *absolute_command = get_absolute_command (priv->command);
++    g_auto(GStrv) tokens = g_strsplit (absolute_command, " ", 2);
++    const gchar* binary = tokens[0];
++    const gchar *extra_options = tokens[1];
++
+     if (!absolute_command)
+     {
+         l_debug (display_server, "Can't launch X server %s, not found in path", priv->command);
+         stopped_cb (priv->x_server_process, X_SERVER_LOCAL (server));
+         return FALSE;
+     }
+-    g_autoptr(GString) command = g_string_new (absolute_command);
++    g_autoptr(GString) command = g_string_new (binary);
+ 
++    /* The display argument must be given first when the X server used
++     * is Xvnc. */
+     g_string_append_printf (command, " :%d", priv->display_number);
+ 
+     if (priv->config_file)
+@@ -513,6 +519,12 @@ x_server_local_start (DisplayServer *display_server)
+     if (X_SERVER_LOCAL_GET_CLASS (server)->add_args)
+         X_SERVER_LOCAL_GET_CLASS (server)->add_args (server, command);
+ 
++    /* Any extra user options provided via the VNCServer 'command'
++     * config option are appended last, so the user can override any
++     * of the above. */
++    if (extra_options)
++        g_string_append_printf (command, " %s", extra_options);
++
+     process_set_command (priv->x_server_process, command->str);
+ 
+     l_debug (display_server, "Launching X Server");
+-- 
+2.36.1
+