NETMOD Working Group P. Andersson Internet-Draft Cisco Systems Updates: 6020, 7950, 8407 (if approved) 4 July 2024 Intended status: Experimental Expires: 5 January 2025 YANG module file name convention draft-andersson-netmod-yang-module-filename-01 Abstract This document presents YANG module file name convention. The convention extends the current YANG module file name using revision-date, with the YANG semantic version extension. The YANG semantic version extension allows for an informative version to be associated with a particular YANG module revision. Editorial note (To be removed by the RFC Editor) In the YANG module versioning work it was previously defined in [I-D.ietf-netmod-yang-semver] that file names could use the revision label (YANG Semantic version extension) instead of the revision date, which is standardized in [RFC7950]. This work was removed in an attempt to progress the module versioning work, but the YANG versioning design team was tasked to address it by the NETMOD WG. This draft extends YANG module file names conformity with the possibility to use revision label instead of revision date. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on 5 January 2025. Andersson Expires 5 January 2025 [Page 1] Internet-Draft YANG module file name convention July 2024 Copyright Notice Copyright (c) 2024 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/ license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Motivation . . . . . . . . . . . . . . . . . . . . . . . 2 2. Module file names . . . . . . . . . . . . . . . . . . . . . . 3 2.1. Coexistence with YANG Semver . . . . . . . . . . . . . . 3 2.2. Known incompatibilities . . . . . . . . . . . . . . . . . 4 3. Security Considerations . . . . . . . . . . . . . . . . . . . 4 4. References . . . . . . . . . . . . . . . . . . . . . . . . . 4 4.1. Normative References . . . . . . . . . . . . . . . . . . 4 4.2. Informative References . . . . . . . . . . . . . . . . . 5 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 5 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 5 1. Introduction This document defines the YANG module file convention. It extends the current convention defined in [RFC7950], which uses revision- date, with the YANG semantic version extension defined in [I-D.ietf-netmod-yang-semver]. 1.1. Motivation The motivation for using YANG semantic version instead of revision date is that it carries information to the user. A revision date only tells the user that it has been updated, while, for instance, a YANG Semver version can tell the user about the module's compatibility level at a glance. Having this information available as early as possible, i.e. in the module file name, makes it possible to quickly identify the module revision; compared to searching in the file contents and checking the revisions. Having the YANG semantic version visible in the file name will make it easier to handle large sets of YANG modules. Andersson Expires 5 January 2025 [Page 2] Internet-Draft YANG module file name convention July 2024 The YANG module file name schema described in this draft is already deployed in the industry. Now is the time to standardize before several proprietary solutions emerge. One possibility is to propose a standard that gains operational experience. It is relatively easy to update tooling to handle YANG semantic version in the YANG module file name according to this draft. However, it is recognized that the migration of all tooling within the industry will take time. 2. Module file names This section updates Section 5.2 of [RFC7950], Section 5.2 of [RFC6020], and Section 3.2 of [RFC8407]. If a revision has an associated YANG semantic version (ys:version) then it is RECOMMENDED that the YANG semantic version is used instead of the revision date in the file name of a YANG file, where it takes the form: module-or-submodule-name [['@' revision-date]['#' ys:version]] ( '.yang' / '.yin' ) E.g., acme-router-module@2024-05-15.yang or acme-router-module#2.0.3.yang. In short, the YANG semantic version is recommended in order to simplify for module consumers, i.e. to convey compatibility status without needing to read the module. YANG module (or submodule) files MAY be identified using either revision-date or YANG semantic version (ys:version). Typically, only one file name SHOULD exist for the same module (or submodule) revision. Two file names, one with the revision date and another with the YANG semantic version, MAY exist for the same module (or submodule) revision, e.g., when migrating from one scheme to the other. 2.1. Coexistence with YANG Semver As can be seen above, all valid identifiers for YANG semantic version are valid in the filename as well. Section 4.3 of [I-D.ietf-netmod-yang-semver] The following example is a valid YANG module file name Andersson Expires 5 January 2025 [Page 3] Internet-Draft YANG module file name convention July 2024 example-module#2.3.1_non_compatible+build2237refM443ss.yang One consequence of this is that there might exist two child modules of version 2.0.0 with the same X.Y.Z digits (2.0.1) but different version labels: 2.0.1-draft-superman-super-stuff-03 2.0.1-draft-batman-cool-addition-07 (a competing draft) 2.2. Known incompatibilities There are currently no known publicly available tools that support the YANG semantic version file name schema. There are known proprietary tooling that already uses the file name schema presented in this document. At the IETF 119 Hackathon, there was a project that investigated the feasibility to modify popular YANG tooling to support the proposed schema. There was a successful attempt to modify pyang to support the file name schema and also "recommended-min" previously included in [I-D.ietf-netmod-yang-module-versioning]. Furthermore, there were efforts in researching yanger and libyang to support the schema, but the hackathon ended before these projects could be concluded. 3. Security Considerations There are no security considerations for this draft. 4. References 4.1. Normative References [I-D.ietf-netmod-rfc8407bis] Bierman, A., Boucadair, M., and Q. Wu, "Guidelines for Authors and Reviewers of Documents Containing YANG Data Models", Work in Progress, Internet-Draft, draft-ietf- netmod-rfc8407bis-12, 21 June 2024, . Andersson Expires 5 January 2025 [Page 4] Internet-Draft YANG module file name convention July 2024 [I-D.ietf-netmod-yang-module-versioning] Wilton, R., Rahman, R., Lengyel, B., Clarke, J., and J. Sterne, "Updated YANG Module Revision Handling", Work in Progress, Internet-Draft, draft-ietf-netmod-yang-module- versioning-12, 24 June 2024, . [I-D.ietf-netmod-yang-semver] Clarke, J., Wilton, R., Rahman, R., Lengyel, B., Sterne, J., and B. Claise, "YANG Semantic Versioning", Work in Progress, Internet-Draft, draft-ietf-netmod-yang-semver- 17, 2 July 2024, . [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010, . [RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, August 2016, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC8407] Bierman, A., "Guidelines for Authors and Reviewers of Documents Containing YANG Data Models", BCP 216, RFC 8407, DOI 10.17487/RFC8407, October 2018, . 4.2. Informative References Acknowledgements The author would like to thank Joe Clarke for excellent technical reviews, support, and guidance. Author's Address Andersson Expires 5 January 2025 [Page 5] Internet-Draft YANG module file name convention July 2024 Per Andersson Cisco Systems Email: per.ietf@ionio.se Andersson Expires 5 January 2025 [Page 6]