dev-lang/erlang: fix localhost clash with Docker

[ignamartinoli]

need is incompatible with Docker

Closes: https://bugs.gentoo.org/857099
Signed-off-by: igna_martinoli ignamartinoli@protonmail.com

[gentoo-bot]

Pull Request assignment

Submitter: @ignamartinoli
Areas affected: ebuilds
Packages affected: dev-lang/erlang

dev-lang/erlang: @jpds, @MatthewGentoo

Linked bugs

Bugs linked: 857099

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[gentoo-repo-qa-bot]

Pull request CI report

Report generated at: 2022-07-12 03:59 UTC
Newest commit scanned: 4e57201
Status: ✅ good

There are existing issues already. Please look into the report to make sure none of them affect the packages in question:
https://qa-reports.gentoo.org/output/gentoo-ci/745e4f891d/output.html

[thesamesam]

@tgbugs ok?

[tgbugs]

Hrm. In my testing this fails to start. Debugging now.

[tgbugs]

In summary: yes, this fixes the issue. Other issues seem to be related to the default conf.d file.

Ok, so there is some really broken stuff going on between rabbitmq and epmd. This does indeed resolve my immediate issue with docker ... but only because epmd is technically "running" when it is in the crashed state and rabbitmq then seemingly starts its own instance of epmd (!?!?!). It looks like epmd crashes in docker no matter what right now. I did my test with loopback down/disabled, and everything seems ok with use loopback. edit: Not only that ... but the empd that is started by rabbitmq runs under the rabbitmq users but can be stopped by running /etc/init.d/epmd stop. I'm guessing this is due to /run not being mounted or something crazy like that.

All in all I think this is ok, and more representative of correct epmd behavior. The epmd init in docker is still borked, but let's take that in a separate issue.

edit2: in the container it seems that what is happening is that it can't bind on 127.0.0.1

epmd -address 127.0.0.1
epmd: Tue Jul 12 04:42:25 2022: failed to bind on ipaddr 127.0.0.1: Address not available

I suspect that I should remove the command args from conf.d in this case an it will work as expected.

[tgbugs]

On further though, why not just comment out the command_args line in conf.d while we're at it since that is technically the default behavior anyway?

[MatthewGentoo]

Would it be best to have use net instead of use lo for cases like this where the bind address is changed?

[ignamartinoli]

Hey, sorry for going missing. I was submerged by university and planned to resume the work with this on November.

Thanks @MatthewGentoo for giving this issue a conclusion, I really hope to be able to help on other issues soon 😃