Date: Thu, 07 Nov 2013 12:13:57 -0500 From: Allan Jude <freebsd@allanjude.com> To: freebsd-current@freebsd.org Subject: Re: cron(8) improvement Message-ID: <527BCA55.2000207@allanjude.com> In-Reply-To: <CA%2B7WWSf_%2BBg8rjLdN1j032G2P81odfmQe-Ejyq7A4CqyqPqiAA@mail.gmail.com> References: <52792B60.1030309@allanjude.com> <488180AE-5C23-402A-BAA4-E3263D8C52BF@kientzle.com> <1383788977.14448.44112617.6F0D61A0@webmail.messagingengine.com> <527AFAA1.1040001@allanjude.com> <CA%2B7WWSdFFk4npy0=TOWO=6RApv5-wuJASHhE87eUf52DjQrxjw@mail.gmail.com> <D260751E-85D2-4591-88E0-5EFE1821D532@orthanc.ca> <CA%2B7WWSf_%2BBg8rjLdN1j032G2P81odfmQe-Ejyq7A4CqyqPqiAA@mail.gmail.com>
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[-- Attachment #1 --] On 2013-11-07 07:11, Kimmo Paasiala wrote: > On Thu, Nov 7, 2013 at 6:43 AM, Lyndon Nerenberg <lyndon@orthanc.ca> wrote: >> On Nov 6, 2013, at 7:49 PM, Kimmo Paasiala <kpaasial@gmail.com> wrote: >> >>> What's wrong with using the existing tools for achieving the same >>> effect? Periodic can be adapted to do exactly what you're describing >>> as noted above by adding an hourly (even minutely? :D ) periodic run. >> Periodic is geared towards periodic system maintenance tasks. Once per day, once per week, once per month. It doesn't deal with tasks that need to be fired off at arbitrary intervals. >> >> As you say, it could be adapted to run things with per-minute granularity, but it wouldn't scale well. For per-minute granularity you would have to fire off a periodic run every minute. That's five times the rate that atrun(8) kicks off at. That's a lot of overhead for small, embedded, or power constrained systems. And to get the time-granularity cron has, you would have to re-implement cron(8)s dispatch control as a set of shell functions. That's just silly. >> >> >> --lyndon >> >> > Well ok, I get your point. I guess there's no other option than to add > support for a cron.d directory for crontab -snippets. I'd however like > to emphasize one thing that has been noted already: > > - Snippets installed by ports should be disabled by default and > enabled only selectively by variables in rc.conf(5) or some other > configuration file to mirror what periodic(8) is doing now. This is > an absolute must because having them enabled by default is a recipe > for disaster. Compare this to services installed by ports, none of > them are enabled by default. > > -Kimmo > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" Right. The best way to handle this is likely to have the ports install the example cron to ${PREFIX}/share/portname/ or wherever else they normally put examples, with instructions in the pkg-message on how to enable the cron. The same way that ports that add something to apache don't install to the apache etc/apache22/Includes/ directory, but instead tell you to add the lines to a file there. -- Allan Jude [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.16 (MingW32) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBAgAGBQJSe8pYAAoJEJrBFpNRJZKfZYwP/jYTHqJGg1vdgtSKqJj4RnMb ijSizyF7OxSiJQHUCGLxySMd5yzSlMM7mdD3U7t1WYRwvxnIDTWm2hdOWespiQqb 1tX0B5KcR8jOH12XgzHNi7U7nOCPFbRPCfANLZYv2SRFY7WPph/Hi1y0qo4ZQWAw 4bVwoEOxG6Ezo0NKVba34xjcTlOYOYLoqq9vnzQH0ka1n+Of6lKCKm18gi+FcgWm BgP0/he49/SjLhZdfrzxnsNiyqTauWr3xTD16G8R9YwhOtkmgSvrRQ4EyPjO0xMh 76ollQHKzBi5LlxgZ5afxiTKDoffM10eXBJyKH3Uz24OoL7OOS2/YERUSXzahbNa gf15eoMl4A1v/j+GRMA+wmATZlq6kPdRKB0NSNLqSdqyD/8nEONuHPLSI+sToMzU 3tj13dRKwKkeu2m71VQYSsotq9ShM4Ydrtp2ExtYgyBx6OkOjyYW8cvlzEjCNolp LXtC4sKG6RO6nlALq5z54o+DXpM+EdYeUxSjIiL3e1CAKBWFBO5bhFMKNAN20jSa ig4S2XFyEBQbF18MipvxNILaqAqO8mlUv0qXGH1ZzTh9MkIj+JxujOnvjSROGhkq oO8UhPADMCBWtuyQJDvsmMSfKK7V13HQLRCB/Yw+/64UbgII+aKEJwhI7Xem3cYy eL/eAE7+xE8OgSoJDVP2 =h2a4 -----END PGP SIGNATURE-----
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