Hi all,

I want to alert you to some changes we're going to be making to the step
API. The changes are minimal, and shouldn't have an impact on existing
plugins, but I want to make sure people are aware of it.

There's a PR at https://github.com/hashicorp/packer/pull/5810 to move the
multistep library into packer itself, and to add `context.Context` as a
parameter to the `Step.Run` interface.

If you have your plugin dependencies pegged through govendor or similar,
you should not be impacted. Existing plugin binaries will continue to work,
and your plugin will continue to build.

If, however, you update your dependencies to the latest version of packer,
you'll need to do two things:

1. replace references to `github.com/mitchellh/multistep` with  `
github.com/hashicorp/packer/helper/multistep`.
2. Change your Step.Run signatures to have `context.Context` as the first
parameter. I did this with `find . -iname "step_*.go" -exec gsed -i''
's/func \(.*\)Run(/func \1Run(_ context.Context, /' {} \;`

Thanks!
--Matt Hooker

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