[gnome-builder] foundry: set some basic environment vars when necessary

[Christian Hergert <chergert src gnome org>]

commit b1023f54b378135fa75d93c6234371d6c1f2d408
Author: Christian Hergert <chergert redhat com>
Date:   Wed Feb 12 09:55:15 2020 -0800

    foundry: set some basic environment vars when necessary
    
    These get set when we launch terminals, so we can set them as fallback for
    applications too. Ideally it would have been handled all for us, but we
    might need to be more explicit when running via external launcher systems.

 src/libide/foundry/ide-run-manager.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
---
diff --git a/src/libide/foundry/ide-run-manager.c b/src/libide/foundry/ide-run-manager.c
index b4483aa13..c5de0c44d 100644
--- a/src/libide/foundry/ide-run-manager.c
+++ b/src/libide/foundry/ide-run-manager.c
@@ -422,6 +422,32 @@ ide_run_manager_run_cb (GObject      *object,
   IDE_EXIT;
 }
 
+static void
+copy_builtin_envvars (IdeEnvironment *environment)
+{
+  static const gchar *copy_env[] = {
+    "COLORTERM",
+    "DESKTOP_SESSION",
+    "LANG",
+    "WAYLAND_DISPLAY",
+    "XDG_CURRENT_DESKTOP",
+    "XDG_SEAT",
+    "XDG_SESSION_DESKTOP",
+    "XDG_SESSION_ID",
+    "XDG_SESSION_TYPE",
+    "XDG_VTNR",
+  };
+
+  for (guint i = 0; i < G_N_ELEMENTS (copy_env); i++)
+    {
+      const gchar *key = copy_env[i];
+      const gchar *val = g_getenv (key);
+
+      if (val != NULL && ide_environment_getenv (environment, key) == NULL)
+        ide_environment_setenv (environment, key, val);
+    }
+}
+
 static void
 do_run_async (IdeRunManager *self,
               IdeTask       *task)
@@ -491,6 +517,7 @@ do_run_async (IdeRunManager *self,
   environment = ide_runner_get_environment (runner);
   /* FIXME: Allow toggling this in build prefs */
   ide_environment_setenv (environment, "G_MESSAGES_DEBUG", "all");
+  copy_builtin_envvars (environment);
   ide_environment_copy_into (ide_config_get_environment (config), environment, TRUE);
 
   g_signal_emit (self, signals [RUN], 0, runner);