December 2012 - Zypp Development - openSUSE Mailing Lists

[zypp-devel] Current cases which Zypp doesn't handle well?
by Edward Z. Yang 31 Dec '12

31 Dec '12

Hello all, I quite like the fact that Zypp uses a SAT solver to do its dependency generation. However, I'm curious if there are any situations which you have encountered where Zypp does a poor job, from a solving or usability perspective. For example, are there any cases where your heuristic for dealing with degrees of freedom does poorly? Any places where the language of boolean formulas is not expressive enough (e.g. you want integer ranges or comparisons?) Some context: I recently happened upon this project: http://www.cs.wm.edu/~tdillig/mistral/index.html And it seems like it adds some features to SAT solvers that would be really useful for package managers: in particular, it has an "explain" module which can take some desired end-result (conclusion) and the current state (hypothesis), and find the minimal set of extra hypothesis necessary to reach the end-result. This seems to more directly correspond to the package solving problem, so I'm interested in comparing the two approaches! Thanks, Edward -- To unsubscribe, e-mail: zypp-devel+unsubscribe(a)opensuse.org To contact the owner, e-mail: zypp-devel+owner(a)opensuse.org

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[zypp-devel] How to detect installation via libzypp vs plain RPM in %post?
by Ladislav Slezak 05 Dec '12

05 Dec '12

Hi all, Right now I'm improving Webyast packaging, the problem is that installing or updating a webyast package requires updating assets files, updating Gemfile and then restarting Webyast to use the new/updated files. Until now this was done in %post section, but this is very inefficient and slows down the Webyast installation a lot. There are almost 20 webyast modules and even if the update and restart takes about 3 seconds doing it 20 times results in extra 1 minute installation time. That's quite a lot IMO. Therefore I switched to using libzypp update scripts (/var/adm/update-scripts/%name-%version-%release-update) and restart is done only once at the end. So far so good. The problem now is how to make this backward compatible with plain RPM update? If you use rpm command for manual update then you need to run the update script manually. If you miss it you'll be still running the old Webyast which will be confusing for users. So the question is: Is it possible to detect installation via libzypp or via plain rpm in %post script? Ideally I'd like to use update-scripts in libzypp installation and as a fallback in plain rpm installation I'd run the restart in each %post. Or is it somehow possible to mix update-scripts and rpm %posttrans to support transactions in both libzypp and plain rpm? Any examples? Thank you a lot! -- Ladislav Slezák Appliance department / YaST Developer Lihovarská 1060/12 190 00 Prague 9 / Czech Republic tel: +420 284 028 960 lslezak(a)suse.com SUSE -- To unsubscribe, e-mail: zypp-devel+unsubscribe(a)opensuse.org To contact the owner, e-mail: zypp-devel+owner(a)opensuse.org

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[zypp-devel] examples
by Thomas R. Jones 03 Dec '12

03 Dec '12

Hello, Are example use-cases or implementations available? The examples in https://github.com/openSUSE/libzypp use deprecated functions(i think). I ran through quickly and noticed that a few undefined references would be elicited. I can't verify this right now as github seems to be having a network partition issue and connectivity is nill. Thanks. -- Thomas R. Jones Founder Premunir Ltd. Co. 464 Larmon Mill Rd. | Bowling Green, KY 42104 direct (270) 991-4409 Confidentiality Note: This e-mail and any attachments are confidential and may be protected by legal privilege. If you are not the intended recipient, be aware that any disclosure, copying, distribution or use of this e-mail or any attachment is prohibited. If you have received this e-mail in error, please notify us immediately by returning it to the sender and delete this copy from your system. Thank you for your cooperation. -- To unsubscribe, e-mail: zypp-devel+unsubscribe(a)opensuse.org To contact the owner, e-mail: zypp-devel+owner(a)opensuse.org

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