6 files changed, 29 insertions, 13 deletions
diff --git a/lib/fstree/Makemodule.am b/lib/fstree/Makemodule.am
index 64c2650..33b508c 100644
--- a/lib/fstree/Makemodule.am
+++ b/lib/fstree/Makemodule.am
@@ -3,7 +3,7 @@ libfstree_a_SOURCES += lib/fstree/fstree_sort.c
 libfstree_a_SOURCES += lib/fstree/post_process.c lib/fstree/get_path.c
 libfstree_a_SOURCES += lib/fstree/mknode.c
 libfstree_a_SOURCES += lib/fstree/add_by_path.c
-libfstree_a_SOURCES += include/fstree.h
+libfstree_a_SOURCES += include/fstree.h lib/fstree/internal.h
 libfstree_a_SOURCES += lib/fstree/source_date_epoch.c
 libfstree_a_SOURCES += lib/fstree/canonicalize_name.c
 libfstree_a_CFLAGS = $(AM_CFLAGS)
diff --git a/lib/fstree/fstree.c b/lib/fstree/fstree.c
index 90e14ce..ce35b84 100644
--- a/lib/fstree/fstree.c
+++ b/lib/fstree/fstree.c
@@ -4,9 +4,7 @@
  *
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
  */
-#include "config.h"
-
-#include "fstree.h"
+#include "internal.h"
 
 #include <string.h>
 #include <stdlib.h>
diff --git a/lib/fstree/fstree_sort.c b/lib/fstree/fstree_sort.c
index 124106e..58ffadf 100644
--- a/lib/fstree/fstree_sort.c
+++ b/lib/fstree/fstree_sort.c
@@ -5,9 +5,7 @@
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
  * Copyright (C) 2019 Zachary Dremann <dremann@gmail.com>
  */
-#include "config.h"
-
-#include "fstree.h"
+#include "internal.h"
 
 #include <string.h>
 
diff --git a/lib/fstree/internal.h b/lib/fstree/internal.h
new file mode 100644
index 0000000..e8e5eef
--- /dev/null
+++ b/lib/fstree/internal.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * internal.h
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#ifndef FSTREE_INTERNAL_H
+#define FSTREE_INTERNAL_H
+
+#include "config.h"
+#include "fstree.h"
+
+/* ASCIIbetically sort a linked list of tree nodes */
+tree_node_t *tree_node_list_sort(tree_node_t *head);
+
+/*
+  If the environment variable SOURCE_DATE_EPOCH is set to a parsable number
+  that fits into an unsigned 32 bit value, return its value. Otherwise,
+  default to 0.
+ */
+sqfs_u32 get_source_date_epoch(void);
+
+#endif /* FSTREE_INTERNAL_H */
diff --git a/lib/fstree/post_process.c b/lib/fstree/post_process.c
index 5e7f152..ea52e4f 100644
--- a/lib/fstree/post_process.c
+++ b/lib/fstree/post_process.c
@@ -4,9 +4,7 @@
  *
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
  */
-#include "config.h"
-
-#include "fstree.h"
+#include "internal.h"
 
 #include <stdlib.h>
 #include <stdio.h>
diff --git a/lib/fstree/source_date_epoch.c b/lib/fstree/source_date_epoch.c
index 9b47d56..1efa688 100644
--- a/lib/fstree/source_date_epoch.c
+++ b/lib/fstree/source_date_epoch.c
@@ -1,11 +1,10 @@
 /* SPDX-License-Identifier: GPL-3.0-or-later */
 /*
- * source_date_epoch.h
+ * source_date_epoch.c
  *
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
  */
-#include "config.h"
-#include "fstree.h"
+#include "internal.h"
 
 #include <stdlib.h>
 #include <stdio.h>