willholley opened a new pull request #2352: Remsh improvements URL: https://github.com/apache/couchdb/pull/2352 <!-- Thank you for your contribution! Please file this form by replacing the Markdown comments with your text. If a section needs no action - remove it. Also remember, that CouchDB uses the Review-Then-Commit (RTC) model of code collaboration. Positive feedback is represented +1 from committers and negative is a -1. The -1 also means veto, and needs to be addressed to proceed. Once there are no objections, the PR can be merged by a CouchDB committer. See: http://couchdb.apache.org/bylaws.html#decisions for more info. --> ## Overview This adds a couple of improvements to remsh following an incident where I needed to use it in a CouchDB deployed via Helm. The CouchDB docker container and Helm chart both utilize `ERL_FLAGS` to set the Erlang cookie. Unfortunately, this interferes with `./remsh`, which adds it's own `-setcookie` parameter when calling `erl` - you end up with multiple `-setcookie` and, in the case of the Helm chart, multiple `-name` parameters, resulting in Erlang failing to connect to the remote node. The PR firstly sets `ERL_FLAGS` to empty when invoking `erl`, to avoid conflicts with explicitly set parameters. Secondly, it attempts to automatically locate the cookie from `ERL_FLAGS` or `vm.args` which should yield a better default than `monster` in most cases. ## Testing recommendations <!-- Describe how we can test your changes. Does it provides any behaviour that the end users could notice? --> Testing is a little tricky as it requires a CouchDB deployed using ERL_FLAGS and/or vm.args. I tested it by building a CouchDB release / Docker container locally and passing `-e ERL_FLAGS="-setcookie somecookie"` to `docker run`. ## Related Issues or Pull Requests <!-- If your changes affects multiple components in different repositories please put links to those issues or pull requests here. --> ## Checklist - [ ] Code is written and works correctly - [ ] Changes are covered by tests - [ ] Any new configurable parameters are documented in `rel/overlay/etc/default.ini` - [ ] A PR for documentation changes has been made in https://github.com/apache/couchdb-documentation
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