[gnome-builder] flatpak: add helper to fetch SDK ref name

[Christian Hergert <chergert src gnome org>]

commit 7bd812d19fca49ba79b694bb5f729d020d6f6a28
Author: Christian Hergert <chergert redhat com>
Date:   Fri Feb 17 11:42:27 2017 -0800

    flatpak: add helper to fetch SDK ref name
    
    This allows fetching just the name without the /arch/branch suffix. This
    is useful when passing an SDK to `flatpak build-init`.

 plugins/flatpak/gbp-flatpak-runtime.c |   18 ++++++++++++++++++
 plugins/flatpak/gbp-flatpak-runtime.h |    1 +
 2 files changed, 19 insertions(+), 0 deletions(-)
---
diff --git a/plugins/flatpak/gbp-flatpak-runtime.c b/plugins/flatpak/gbp-flatpak-runtime.c
index d9facc2..70bf391 100644
--- a/plugins/flatpak/gbp-flatpak-runtime.c
+++ b/plugins/flatpak/gbp-flatpak-runtime.c
@@ -454,6 +454,24 @@ gbp_flatpak_runtime_get_sdk (GbpFlatpakRuntime *self)
   return self->sdk;
 }
 
+gchar *
+gbp_flatpak_runtime_get_sdk_name (GbpFlatpakRuntime *self)
+{
+  const gchar *slash;
+
+  g_return_val_if_fail (GBP_IS_FLATPAK_RUNTIME (self), NULL);
+
+  if (self->sdk == NULL)
+    return NULL;
+
+  slash = strchr (self->sdk, '/');
+
+  if (slash == NULL)
+    return g_strdup (self->sdk);
+  else
+    return g_strndup (self->sdk, slash - self->sdk);
+}
+
 void
 gbp_flatpak_runtime_set_sdk (GbpFlatpakRuntime *self,
                              const gchar       *sdk)
diff --git a/plugins/flatpak/gbp-flatpak-runtime.h b/plugins/flatpak/gbp-flatpak-runtime.h
index 4c11080..7834f42 100644
--- a/plugins/flatpak/gbp-flatpak-runtime.h
+++ b/plugins/flatpak/gbp-flatpak-runtime.h
@@ -39,6 +39,7 @@ const gchar         *gbp_flatpak_runtime_get_arch     (GbpFlatpakRuntime    *sel
 const gchar         *gbp_flatpak_runtime_get_branch   (GbpFlatpakRuntime    *self);
 const gchar         *gbp_flatpak_runtime_get_platform (GbpFlatpakRuntime    *self);
 const gchar         *gbp_flatpak_runtime_get_sdk      (GbpFlatpakRuntime    *self);
+gchar               *gbp_flatpak_runtime_get_sdk_name (GbpFlatpakRuntime    *self);
 
 G_END_DECLS