diff options
Diffstat (limited to 'python/vyos/util.py')
| -rw-r--r-- | python/vyos/util.py | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/python/vyos/util.py b/python/vyos/util.py index c1644247f..e8f1aabeb 100644 --- a/python/vyos/util.py +++ b/python/vyos/util.py @@ -16,6 +16,9 @@ import os import re import sys +import time + +import inotify.adapters # # NOTE: Do not import full classes here, move your import to the function @@ -507,6 +510,36 @@ def file_is_persistent(path): absolute = os.path.abspath(os.path.dirname(path)) return re.match(location,absolute) +def wait_for_inotify(file_path, event_type=None, timeout=None, sleep_interval=0.1): + """ Waits for an inotify event to occur """ + if not os.path.dirname(file_path): + raise ValueError( + "File path {} does not have a directory part (required for inotify watching)".format(file_path)) + if not os.path.basename(file_path): + raise ValueError( + "File path {} does not have a file part, do not know what to watch for".format(file_path)) + + time_start = time.time() + + i = inotify.adapters.Inotify() + i.add_watch(os.path.dirname(file_path)) + + for event in i.event_gen(yield_nones=True): + if (timeout is not None) and ((time.time() - time_start) > timeout): + # If the function didn't return until this point, + # the file failed to have been written to and closed within the timeout + raise OSError("Waiting for file {} to be written has failed".format(file_path)) + + if event is not None: + (_, type_names, path, filename) = event + if filename == os.path.basename(file_path): + if event_type in type_names: + return + +def wait_for_file_write_complete(file_path, timeout=None, sleep_interval=0.1): + """ Waits for a process to close a file after opening it in write mode. """ + wait_for_inotify(file_path, + event_type='IN_CLOSE_WRITE', timeout=timeout, sleep_interval=sleep_interval) def commit_in_progress(): """ Not to be used in normal op mode scripts! """ |