build: add a tool to scan extensions/ for kernel extensions

tools/socks.kexttool

@@ -2,4 +2,31 @@
 # vim: ft=python
 # -*- mode: python -*-
 
-print('hello, world')
+import glob
+import os
+from kexttool import kext
+
+cwd = os.getcwd()
+scan_arg = os.path.join(cwd, 'extensions', '**/extension.info')
+
+nr_extensions = 0
+
+# root_dir needs a trailing slash (i.e. /root/dir/)
+for filename in glob.iglob(scan_arg, recursive=True):
+     try:
+          kext_src = kext.KextSource(filename)
+     except Exception as e:
+          print('E: cannot read kernel extension source manifest (reason: {})'.format(e))
+          continue
+
+     print('* {}'.format(kext_src.name()))
+     print('   Bundle ID: {}'.format(kext_src.id()))
+     print('   License:   {}'.format(kext_src.license()))
+     print('   Copyright: {}'.format(kext_src.copyright()))
+     print('   Location:  {}'.format(kext_src.src_dirpath()))
+     print('   Sources:')
+
+     for src in kext_src.sources():
+          print('      {}'.format(src))
+
+     nr_extensions = nr_extensions + 1