Re: incron fails after dealing with changes done by useradd or userdell

From: Patryk <>
Date: Mon, 07 Mar 2011 18:01:14 +0100

On 03/07/2011 05:05 PM, Andrew Pollock wrote:
> On Mon, Mar 07, 2011 at 02:46:49PM +0100, Patryk wrote:
>> Hello,
>> I gave incron 0.5.8 a try.
>> # `incrontab -e`
>> /etc/passwd IN_CLOSE_WRITE /send/me/an/email
>> useradd would trigger this immediately, sending 2 notification emails. After that incron
>> would just hang and ignore any changes to the passwd file. The same happens with
>> /etc/group or userdel, however echo text > /some/other/file works all the time without
>> crashing anything.
> I don't think this is a bug with incron.
> I think you should strace useradd and see what it's doing. I think you may
> find that it's creating a temporary file with the new user in it, and then
> moving it over the top of the current passwd file. This isn't going to be
> considered an IN_CLOSE_WRITE by incron, which is why you're not seeing your
> job execute.
> Sure enough, strace (on my system) reveals that useradd manipulates an
> /etc/passwd+ and an /etc/passwd-, and rename()s /etc/passwd+ to /etc/passwd.
> regards
> Andrew

Hi Andrew,

From your explanation I can conclude that it should never trigger, while it triggers once
and then stops reacting completely.
Are you sure this is not a bug?


Received on Tue Jun 05 2012 - 22:14:21 CEST

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