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-windows-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. > > 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. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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