Add inotify librecipe api used in ssh_keysauthority

slapos/recipe/librecipe/inotify.py

+##############################################################################
+#
+# Copyright (c) 2010 Vifib SARL and Contributors. All Rights Reserved.
+#
+# WARNING: This program as such is intended to be used by professional
+# programmers who take the whole responsibility of assessing all potential
+# consequences resulting from its eventual inadequacies and bugs
+# End users who are looking for a ready-to-use solution with commercial
+# guarantees and support are strongly adviced to contract a Free Software
+# Service Company
+#
+# This program is Free Software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 3
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+#
+##############################################################################
+import os
+
+import inotifyx
+
+def subfiles(directory):
+  """Return the list of subfiles of a directory, and wait for the newly created
+  ones.
+
+  CAUTION : *DONT TRY TO CONVERT THE RESULT OF THIS FUNCTION INTO A LIST !
+  ALWAYS ITERATE OVER IT !!!*"""
+  watchfd = inotifyx.init()
+  inotifyx.add_watch(watchfd, directory, inotifyx.IN_CREATE)
+  try:
+
+    subfiles = set(os.listdir(directory))
+    subfiles |= set([file_.name for file_ in inotifyx.get_events(watchfd, 0)])
+
+    while True:
+      for file_ in subfiles:
+        yield os.path.join(directory, file_)
+
+      subfiles = [file_.name for file_ in inotifyx.get_events(watchfd)]
+
+  finally:
+    os.close(watchfd)