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[netmod] YANG revision dates unique in module ?

"Sterne, Jason (Nokia - CA/Ottawa)" <jason.sterne@nokia.com> Tue, 01 June 2021 13:36 UTC

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From: "Sterne, Jason (Nokia - CA/Ottawa)" <jason.sterne@nokia.com>
To: "netmod@ietf.org" <netmod@ietf.org>
Thread-Topic: YANG revision dates unique in module ?
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Date: Tue, 01 Jun 2021 13:36:09 +0000
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Subject: [netmod] YANG revision dates unique in module ?
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Hi all,

In our YANG versioning work we are proposing that a revision-label is unique and the revision history of a module must not contain the same revision-label twice.

We're debating whether we should state the same rule for revision *date* as well.

RFC7950 doesn't seem to explicitly say that revision date must not be duplicated in the revision history.

This issue came up recently in an OpenConfig discussion here:
Updates to OpenConfig types modules. * openconfig/public@f20ed84 (github.com)<https://github.com/openconfig/public/commit/f20ed8411a6fc1f55c9debed55c852ea4ffef5bb#commitcomment-51076470>

Was it the intention of RFC7950 that a revision history should never have the same revision date twice ?

I think it is somewhat inferred from various drafts that describe how a module name + revision date uniquely identifies a module revision. But it doesn't seem to be explicitly stated in RFC7950.

If we disallow duplicate revision dates, that makes the module-name+date tuple unique, but it does mean that authors can't produce 2 versions of a module in the same day. In theory we *could* do something like this:
- require unique revision-labels
- allow duplicate revision dates

But in that case, only the module-name+revision-label can be the unique identifier for a revision.

Jason

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