[gnome-builder] flatpak: set CCACHE_DIR environment variable

[Christian Hergert <chergert src gnome org>]

commit 48f83b2200f0acab0667f5a97bfd340732802beb
Author: Christian Hergert <chergert redhat com>
Date:   Thu Mar 16 13:06:08 2017 -0700

    flatpak: set CCACHE_DIR environment variable
    
    When doing incremental builds, we want to use the same ccache dir that
    flatpak-builder will be using.

 plugins/flatpak/gbp-flatpak-runtime.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/plugins/flatpak/gbp-flatpak-runtime.c b/plugins/flatpak/gbp-flatpak-runtime.c
index 3dd4461..d0a503c 100644
--- a/plugins/flatpak/gbp-flatpak-runtime.c
+++ b/plugins/flatpak/gbp-flatpak-runtime.c
@@ -173,6 +173,12 @@ gbp_flatpak_runtime_create_launcher (IdeRuntime  *runtime,
       ide_subprocess_launcher_push_argv (ret, "flatpak");
       ide_subprocess_launcher_push_argv (ret, "build");
       ide_subprocess_launcher_push_argv (ret, "--share=network");
+
+      /* We might need access to ccache configs inside the build environ.
+       * See https://bugzilla.gnome.org/show_bug.cgi?id=780153
+       */
+      ide_subprocess_launcher_push_argv (ret, "--filesystem=~/.ccache");
+
       if (!ide_str_empty0 (project_path))
         {
           g_autofree gchar *filesystem_option_src = NULL;