- A patch that adds or removes user-visible features should
also update the appropriate user documentation or manpages.
+ Check "Feature Deprecation Guidelines" section in this document
+ if you intend to remove user-visible feature.
Testing is also important:
Reported-at: http://openvswitch.org/pipermail/dev/2014-June/040952.html
+ Submitted-at: <URL>
+
+ If a patch was submitted somewhere other than the Open vSwitch
+ development mailing list, such as a GitHub pull request, this header can
+ be used to reference the source.
+
+ Submitted-at: https://github.com/openvswitch/ovs/pull/92
+
VMware-BZ: #1234567
ONF-JIRA: EXT-12345
in old change log entries. (They are obsolete because they do
not tell the reader what bug tracker is referred to.)
+ Fixes: 63bc9fb1c69f (“packets: Reorder CS_* flags to remove gap.”)
+
+ If you would like to record which commit introduced a bug being fixed,
+ you may do that with a “Fixes” header. This assists in determining
+ which OVS releases have the bug, so the patch can be applied to all
+ affected versions. The easiest way to generate the header in the
+ proper format is with this git command:
+
+ git log -1 --pretty=format:"Fixes: %h (\"%s\")" --abbrev=12 COMMIT_REF
+
Developer's Certificate of Origin
---------------------------------
maintained indefinitely and may be redistributed consistent with
this project or the open source license(s) involved.
+Feature Deprecation Guidelines
+------------------------------
+
+Open vSwitch is intended to be user friendly. This means that under
+normal circumstances we don't abruptly remove features from OVS that
+some users might still be using. Otherwise, if we would, then we would
+possibly break our user setup when they upgrade and would receive bug
+reports.
+
+Typical process to deprecate a feature in Open vSwitch is to:
+
+ (a) Mention deprecation of a feature in the NEWS file. Also, mention
+ expected release or absolute time when this feature would be removed
+ from OVS altogether. Don't use relative time (e.g. "in 6 months")
+ because that is not clearly interpretable.
+
+ (b) If Open vSwitch is configured to use deprecated feature it should print
+ a warning message to the log files clearly indicating that feature is
+ deprecated and that use of it should be avoided.
+
+ (c) If this feature is mentioned in man pages, then add "Deprecated" keyword
+ to it.
+
+Also, if there is alternative feature to the one that is about to be marked
+as deprecated, then mention it in (a), (b) and (c) as well.
+
+Remember to followup and actually remove the feature from OVS codebase
+once deprecation grace period has expired and users had opportunity to
+use at least one OVS release that would have informed them about feature
+deprecation!
+
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