[gnome-builder] flatpak: add helper to resolve app paths

[Christian Hergert <chergert src gnome org>]

commit f251acc15ce1d9df47cb807c30dd716013757beb
Author: Christian Hergert <chergert redhat com>
Date:   Thu Mar 9 00:17:35 2017 -0800

    flatpak: add helper to resolve app paths
    
    We might need to find the path on the host, so add a helper to join paths
    to get access to the file on the host.

 libide/util/ide-flatpak.c |   22 ++++++++++++++++++++++
 libide/util/ide-flatpak.h |    3 ++-
 2 files changed, 24 insertions(+), 1 deletions(-)
---
diff --git a/libide/util/ide-flatpak.c b/libide/util/ide-flatpak.c
index 857fce9..8f33356 100644
--- a/libide/util/ide-flatpak.c
+++ b/libide/util/ide-flatpak.c
@@ -44,3 +44,25 @@ ide_is_flatpak (void)
 
   return is_flatpak;
 }
+
+static gchar *
+get_base_path (const gchar *name)
+{
+  g_autoptr(GKeyFile) keyfile = g_key_file_new ();
+
+  if (g_key_file_load_from_file (keyfile, "/.flatpak-info", 0, NULL))
+    return g_key_file_get_string (keyfile, "Instance", name, NULL);
+
+  return NULL;
+}
+
+gchar *
+ide_flatpak_get_app_path (const gchar *path)
+{
+  static gchar *base_path;
+
+  if (base_path == NULL)
+    base_path = get_base_path ("app-path");
+
+  return g_build_filename (base_path, path, NULL);
+}
diff --git a/libide/util/ide-flatpak.h b/libide/util/ide-flatpak.h
index 3ddd06a..94278a4 100644
--- a/libide/util/ide-flatpak.h
+++ b/libide/util/ide-flatpak.h
@@ -23,7 +23,8 @@
 
 G_BEGIN_DECLS
 
-gboolean ide_is_flatpak (void);
+gboolean  ide_is_flatpak           (void);
+gchar    *ide_flatpak_get_app_path (const gchar *path);
 
 G_END_DECLS