Hello Christoph,
On Sun, Jan 10, 2016 at 6:09 PM, Christoph Molitor < christoph.moli...@googlemail.com> wrote: > Hello Raphaël, > > thanks for your reply and your suggestions. > I added some code to read the error messages. > When I execute the code there are no error messages but still the changes > made to the value of one node are not saved back to the configuration file. > The latest source code can be found here: > https://github.com/cmolitor/AugeasDemoC/blob/simple/src/main.cpp > You need to really look into how to use XPath in Augeas. You can remove pretty much all of https://github.com/cmolitor/AugeasDemoC/blob/simple/src/main.cpp#L93-L111 (and probably more) by using proper XPath expressions instead of manually parsing the tree node by node. Also, Augeas 1.0.0 introduced aug_transform, which is easier/better than manually manipulating nodes in /augeas/load. > > I also went through all the steps using augtool and added the commands as > comments to the source code. > If I execute the commands in augtool the changes are saved to the > configuration file. > > In general, I can load the configuration file, change the value, check > that the value has been really changed by reading it again. Calling > aug_save() does not give an error message but still the changes are not > saved to the file. > > And what is the output of your code then? > I tried this with augeas version 1.2 and 1.4. > > It would be great if I could get further advice how to proceed or a hint > what I am doing wrong. > > I will also have a look at netcf but could not find a detailed > documentation yet. > > netcf has been used for a few years in libvirt. See https://github.com/saaros/libvirt/blob/master/src/interface/interface_backend_netcf.c for example. Cheers, Raphaël > Am 04.01.2016 um 09:44 schrieb Raphaël Pinson < > raphael.pin...@camptocamp.com>: > > Hello Christoph and happy new year to you too! > > > Your code doesn't check for errors (either parsing or saving errors). You > could add checks (looking for `/augeas//error` nodes) just after your call > to aug_load (for parsing errors) and to aug_save (for saving errors). > > One way to debug your code would also be to try it with augtool, which > would be easier to debug. > > Also, are you aware of the netcf project, which provides a higher API on > top of Augeas to access and modify /etc/network/interfaces? > > > > Cheers, > > Raphaël > > > > > > On Fri, Jan 1, 2016 at 5:05 PM, Christoph Molitor < > christoph.moli...@googlemail.com> wrote: > >> Dear all, >> >> first of all a happy new year to everyone. >> >> I am trying to use the augeas C API to apply changes to the >> "/etc/network/interfaces" file. >> So far I was able to apply changes to the tree. However, I am not able to >> save the changes back to the file. >> First, I thought it is a problem with the permissions. However, I copied >> the interfaces file to a different folder and it still does not work. >> Using the command line tool augtool, I am able to make the changes and >> save them to the file. >> >> I uploaded an (almost) minimal version of my program to: >> https://github.com/cmolitor/AugeasDemoC >> >> The repository includes an example „interfaces“. >> I am working on a Raspberry Pi with Raspbian Jessie. >> It would be great if someone could give me a hint what I am doing work >> and where the problem might come from. >> >> Thanks for your support! >> >> Christoph >> >> _______________________________________________ >> augeas-devel mailing list >> augeas-devel@redhat.com >> https://www.redhat.com/mailman/listinfo/augeas-devel >> > > > > -- > Raphaël Pinson > Infrastructure Developer & Training Leader > +33 458 482 013 > > Camptocamp France > Savoie Technolac > BP 352 > 48, avenue du Lac du Bourget > 73372 Le Bourget du Lac, Cedex > www.camptocamp.com > > > -- Raphaël Pinson Infrastructure Developer & Training Leader +33 458 482 013 Camptocamp France Savoie Technolac BP 352 48, avenue du Lac du Bourget 73372 Le Bourget du Lac, Cedex www.camptocamp.com
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