Is there a way to avoid the 5s hang when there is no network?

[mpizenberg]

Quick Summary: I'm trying to setup a container to run tests on students code. The container has to run with docker run --network none and in such conditions, the compilation takes around 5s where it only takes few hundreds milliseconds if network is available. The behavior is easily reproducible with my main OS (Archlinux) when turning off wifi.

SSCCE

elm init
printf "module Main exposing (main)\n\nimport Html\n\nmain = Html.text \"hello world\"" > src/Main.elm
elm make src/Main.elm --output=/dev/null
rm -rf elm-stuff
# cut network, turn off wifi for example
time elm make src/Main.elm --output=/dev/null
# is hanging for 5s before compiling

• Elm: 0.19.1
• Browser: no
• Operating System: Archlinux | Alpine linux container

Additional info

I've seen that timestamps play a role, but it does not seem to be the only thing. In my current container setup, I'm generating ~/.elm, elm.json and elm-stuff at build time, packing them in a tar archive then unpacking them in the script to run tests. Yet I'm still facing that 5s hang.

[github-actions]

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