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Date: | Tue, 28 Oct 2014 08:58:46 -0600 |
From: | Eric Blake <eblake AT redhat DOT com> |
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To: | cygwin AT cygwin DOT com |
Subject: | Re: [ANNOUNCEMENT] TEST RELEASE: Cygwin 1.7.33-0.1 |
References: | <announce DOT 20141022092323 DOT GH32374 AT calimero DOT vinschen DOT de> <C9D37D92E903B347A31B9CF82643BA28072F9229 AT 046-CH1MPN1-043 DOT 046d DOT mgd DOT msft DOT net> <20141022135424 DOT GB18857 AT calimero DOT vinschen DOT de> <C9D37D92E903B347A31B9CF82643BA28072FFFD5 AT 046-CH1MPN1-043 DOT 046d DOT mgd DOT msft DOT net> <20141027212637 DOT GZ20607 AT calimero DOT vinschen DOT de> <C9D37D92E903B347A31B9CF82643BA2807300C63 AT 046-CH1MPN1-043 DOT 046d DOT mgd DOT msft DOT net> <20141028142021 DOT GL20607 AT calimero DOT vinschen DOT de> |
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--9A11pG3lWe2L1xH1s8vEvFGmv0rdKt4J6 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 10/28/2014 08:20 AM, Corinna Vinschen wrote: >>> Now that you mention it... yes, a service dependency might be helpful. >>> Unfortunately it's tricky to automate this. Is it possible to add >>> service deps after having installed a service? >> >> According to >> http://serverfault.com/questions/24821/how-to-add-dependency-on-a-window= s-service-after-the-service-is-installed >> it is possible to add a dependency to an already existing service. I >> agree it would be hard to automate in the install scripts, as one >> would have to either ask the user about their intent to run other >> services or rely that they configured cygserver first and then check >> to see if it has been already configured to determine if a dependency >> should be created. I would think that some instructions in the docs >> near the statement mentioned above would be more than sufficient, >> since this is a "fine tuning" sort of thing. >=20 > Agreed. Do you have some idea how to phrase this? I'd be grateful > for a nice two or three paragraphs discussing this. On Linux, systemd has a notion of soft dependencies, where any service can do a one-sided advertisement that "if this other service is also installed, then here is the order that must be observed between bringing the two services up; but there is no requirement that the other service be installed". Note in particular that both 'before' and 'after' soft dependencies can be specified. I wonder if cygserver could be taught to do something similar - but it would probably be a lot of work. cygserver would have to maintain some sort of database of requested dependencies, and then when installing a service, it would check both if the current service has any soft dependency on other installed cygserver services, as well as whether any other installed cygserver service has a soft dependency on the service being installed, and in either case, add a Windows hard dependency on the correct service. --=20 Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org --9A11pG3lWe2L1xH1s8vEvFGmv0rdKt4J6 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Public key at http://people.redhat.com/eblake/eblake.gpg iQEcBAEBCAAGBQJUT68mAAoJEKeha0olJ0NqhFcH/3f2NXMMWgOm3WIswVf+249Q zLnK9yW0GBUyzD/9LdGY25OMicJTM9hIk0Qa/lqKVpunEVmlxXm7r5ovapvOJVpN Sv7lgDBsrtbWA1gVu1D0Lox9+HfdTsazgLcHFQtSjHpQs46U6xivb6v69PO32RMI LlIi3IMVmnqEaqbrnBkLoprMs3m2SJpOrc16f2WTYmhUV+Bo5dEL10gBRdAgohKR HXmgraM8loN9GqEcv2EIrtxvde0dvWQTJNi7hI8TObJSx/8Mpdv+QAtLkPUhHQkD FrCkzs3X8kbvkuEHcHJL91AP/nE0D1k5D3rhxU/Dw2kUWOlBd4cQaB2j4hYeTMo= =nwvx -----END PGP SIGNATURE----- --9A11pG3lWe2L1xH1s8vEvFGmv0rdKt4J6--
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