A simple wrapper around inotify. No fancy bells and whistles, just a literal wrapper with ctypes. Under 100 lines of code!
inotify_simple is a simple Python wrapper around
No fancy bells and whistles, just a literal wrapper with ctypes. Only ~100
lines of code!
inotify_init1() is wrapped as a file-like object,
INotify(), holding the inotify
INotify().read() reads available data from the file descriptor and
returns events as
namedtuple objects after unpacking them with the
inotify_rm_watch() are wrapped with no changes at all,
taking and returning watch descriptor integers that calling code is expected to keep
track of itself, just as one would use
inotify from C. Works with Python 2.7 and
Python >= 3.2.
$ pip3 install inotify_simple
or to install from source:
$ python3 setup.py install
Note: If on Python < 3.4, you'll need the backported enum34 module.
There are many inotify python wrappers out there. I found them all unsatisfactory. Most are far too high-level for my tastes, and the supposed convenience they provide actually limits one from using inotify in ways other than those the author imagined. Others are C extensions, requiring compilation for different platforms and Python versions, rather than a pure python module using ctypes. This one is pretty low-level and really just does what inotify itself does and nothing more. So hopefully if I've written it right, it will remain functional well into the future with no changes, recompilation or attention on my part.
import os from inotify_simple import INotify, flags os.mkdir('/tmp/inotify_test') inotify = INotify() watch_flags = flags.CREATE | flags.DELETE | flags.MODIFY | flags.DELETE_SELF wd = inotify.add_watch('/tmp/inotify_test', watch_flags) # Now create, delete and modify some files in the directory being monitored: os.chdir('/tmp/inotify_test') # CREATE event for a directory: os.system('mkdir foo') # CREATE event for a file: os.system('echo hello > test.txt') # MODIFY event for the file: os.system('echo world >> test.txt') # DELETE event for the file os.system('rm test.txt') # DELETE event for the directory os.system('rmdir foo') os.chdir('/tmp') # DELETE_SELF on the original directory. # Also generates an IGNORED event # indicating the watch was removed. os.system('rmdir inotify_test') # And see the corresponding events: for event in inotify.read(): print(event) for flag in flags.from_mask(event.mask): print(' ' + str(flag))
This outputs the following:
Event(wd=1, mask=1073742080, cookie=0, name=u'foo') flags.CREATE flags.ISDIR Event(wd=1, mask=256, cookie=0, name=u'test.txt') flags.CREATE Event(wd=1, mask=2, cookie=0, name=u'test.txt') flags.MODIFY Event(wd=1, mask=512, cookie=0, name=u'test.txt') flags.DELETE Event(wd=1, mask=1073742336, cookie=0, name=u'foo') flags.DELETE flags.ISDIR Event(wd=1, mask=1024, cookie=0, name=u'') flags.DELETE_SELF Event(wd=1, mask=32768, cookie=0, name=u'') flags.IGNORED
Note that the flags, since they are defined with an
enum.IntEnum, print as
what they are called rather than their integer values. However they are still
just integers and so can be bitwise-ANDed and ORed etc with masks etc. The
flags.from_mask() method bitwise-ANDs a mask with all possible flags and
returns a list of matches. This is for convenience and useful for debugging
which events are coming through, but performance critical code should
generally bitwise-AND masks with flags of interest itself so as to not do
See here for more.
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