[bug#57168] [PATCH 10/14] gnu: lightdm: Apply patch to allow using VNC options.

[Maxim Cournoyer <maxim.cournoyer@gmail.com>]

* 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.
---
 gnu/local.mk                                  |  1 +
 gnu/packages/display-managers.scm             |  3 +-
 .../patches/lightdm-arguments-ordering.patch  | 54 +++++++++++++++++++
 3 files changed, 57 insertions(+), 1 deletion(-)
 create mode 100644 gnu/packages/patches/lightdm-arguments-ordering.patch

diff --git a/gnu/local.mk b/gnu/local.mk
index b1b0f7ac36..a6be7cc423 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1355,6 +1355,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/librime-fix-build-with-gcc10.patch	\
   %D%/packages/patches/libvirt-add-install-prefix.patch	\
   %D%/packages/patches/libziparchive-add-includes.patch		\
+  %D%/packages/patches/lightdm-arguments-ordering.patch		\
   %D%/packages/patches/lightdm-vncserver-check.patch		\
   %D%/packages/patches/localed-xorg-keyboard.patch		\
   %D%/packages/patches/kdiagram-Fix-missing-link-libraries.patch \
diff --git a/gnu/packages/display-managers.scm b/gnu/packages/display-managers.scm
index 022e0509aa..2a0a72d145 100644
--- a/gnu/packages/display-managers.scm
+++ b/gnu/packages/display-managers.scm
@@ -269,7 +269,8 @@ (define-public lightdm
               (sha256
                (base32
                 "1wr60c946p8jz9kb8zi4cd8d4mkcy7infbvlfzwajiglc22nblxn"))
-              (patches (search-patches "lightdm-vncserver-check.patch"))))
+              (patches (search-patches "lightdm-arguments-ordering.patch"
+                                       "lightdm-vncserver-check.patch"))))
     (build-system gnu-build-system)
     (arguments
      '(#:parallel-tests? #f             ; fails when run in parallel
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
+
-- 
2.36.1