On Wed, Mar 23, 2022 at 3:06 PM Balázs Lengyel <[email protected]> wrote:
> > > > > *From:* Andy Bierman <[email protected]> > *Sent:* Wednesday, 23 March, 2022 22:32 > *To:* Balázs Lengyel <[email protected]> > *Cc:* NetMod WG <[email protected]> > *Subject:* Re: [netmod] Alternative approach to > draft-ma-netmod-immutable-flag-00 > > > > > > > > On Wed, Mar 23, 2022 at 2:16 PM Balázs Lengyel < > [email protected]> wrote: > > Hello Andy, > > I also propose an extension. (see my mail Review of > draft-ma-netmod-immutable-flag-00) > > In Ericsson we saw no need for exceptions, but do see the need for > applying it to descendant nodes. Typically we need to protect a full > subtree. > > > > Why do you need the exceptions? Could you provide some use-case examples ? > > > > I think create/delete-only and modify-only access modes are used the most, > after no-access. > > BALAZS: How is a modify-only data-node different from a mandatory > data-node? It must be there but can be changed. It get’s an initial value > somehow. > Mandatory=true requires the system to provide a value. Modify-only allows the system to decide when an instance is created. > BALAZS: Any examples when would a create/delete only data node be used? > Sometimes developers do not want to write complex instrumentation that supports modification of resources. Instead a user has to delete the old entry and create a new one with (potentially) different parameters. > > Applying to descendant nodes may be better, or may require more work to > > undo the extension used in an ancestor node. This impacts the extension > usage within a grouping. > > > > BALAZS2: I did not include it in my mail, but we actually have one more > rule: > > “Top level statements in augment or groupings do NOT inherit > > the static-data value from containing nodes, they default to > > static-data false.” > > > This seems complicated to users and developers to track how the final schema tree was derived. The 'static-data' extension seems fine to me. We have to support 'user-write' anyways, so it is better if it is not too close to this extension. Things that seem the same, but are NOT the same cause the most support tickets. > > Regards Balazs > > > > Andy > Andy > > > > > *From:* netmod <[email protected]> *On Behalf Of *Andy Bierman > *Sent:* Wednesday, 23 March, 2022 21:10 > *To:* NetMod WG <[email protected]> > *Subject:* [netmod] Alternative approach to > draft-ma-netmod-immutable-flag-00 > > > > Hi, > > > > IMO the problem should be viewed as a refinement to the > > access control policy of the device. A standard mechanism > > such as a YANG extension would be better than a growing > > mix of proprietary solutions. > > > > We have such a YANG extension called "user-write" that is widely deployed. > > A simple boolean is not fine enough granularity, so a bits type is > > needed instead to allow control of create, update, and delete access > operations. > > > > > > > https://www.yumaworks.com/pub/latest/yangauto/yumapro-yangauto-guide.html#ncx-user-write > <https://protect2.fireeye.com/v1/url?k=31323334-501d5122-313273af-454445555731-876c03f0bc610d95&q=1&e=c875257e-41f5-45d6-a9e9-871e5ebb4243&u=https%3A%2F%2Fwww.yumaworks.com%2Fpub%2Flatest%2Fyangauto%2Fyumapro-yangauto-guide.html%23ncx-user-write> > > > > > > Andy > > > >
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