Yes, installing hex is working with mix archive.install github hexpm/hex branch latest --force, it’s rebar that’s giving me troubles.
Installing deps from github is working, but installing deps from hex.pm or cdn.jsdelivr.net is not. I guess they have to whitelist these domains first.
Hey all, just checking in, is codex working okay for you at this point? Have you found any gotchas? I originally tried to use the hex mirror and found some dependencies didn’t work. Has this been your experience?
I would really like to use it if possible!
I ended up going back to the (locally used) Claude Code. The hex mirror is too unstable, and while the codex’s promise is good, I will wait till they improve their infrastructure.
I’m using the gist posted in this thread and it does work - sometimes. When it fails, I restart the task. Sometimes it takes a few restarts before it succeeds. But it does succeed eventually.
Annoying, but codex is free for now so I’d rather use it than other options.
Sometimes it takes a few restarts before it succeeds.
Honestly, I feel like it’s worse than before? I just restarted a task five times last night, three times now… Without success.
I don’t know if the problem is on OpenAI’s side or Hex’s, but it’s really frustrating. Especially when you see the boost that Codex represents on non-Elixir projects…
Curious, has anyone tried hosting their own private mirror of hex? Wondering if that’s a viable option.
Can you show the 403 errors. Afaict we don’t respond with 403 errors from repo.hex.pm unless you are doing authenticated requests for private packages.
I have tried the script provided by @vkryukov but I get the same error when using jsDeliver and no mirror. Can someone show the errors they are getting when using repo.hex.pm directly?
I asked our engineer Savvas to look into this. He is still working on it and will post more details later. But here the brief explanation of what is broken and how to work around it.
Here is the setup script that should work for now:
# OpenAI Codex setup script for Elixir projects
go install github.com/asdf-vm/asdf/cmd/asdf@v0.18.0
asdf plugin add erlang https://github.com/michallepicki/asdf-erlang-prebuilt-ubuntu-24.04.git || true
asdf plugin add elixir
asdf install erlang 28.0.2
asdf set --home erlang 28.0.2
asdf install elixir 1.18.4-otp-28
asdf set --home elixir 1.18.4-otp-28
echo 'export PATH=$HOME/.asdf/shims:$PATH' >> ~/.bashrc
echo 'export HEX_CACERTS_PATH=$CODEX_PROXY_CERT' >> ~/.bashrc
export PATH=$HOME/.asdf/shims:$PATH
export HEX_CACERTS_PATH=$CODEX_PROXY_CERT
# use hex fork with a workaround for httpc bug https://github.com/erlang/otp/issues/10065
mix archive.install --force github 650health/hex branch latest
# mix local.rebar doesn't work on Codex likely because it's not respecting HEX_CACERTS_PATH env var.
# TODO investigate this further
# install rebar manually as a temporary workaround
curl -L -o rebar3 https://s3.amazonaws.com/rebar3/rebar3
chmod +x ./rebar3
./rebar3 local install
export PATH=/root/.cache/rebar3/bin:$PATH
mix local.rebar rebar3 $(which rebar3)
mix deps.get
mix deps.compile
mix compile
Since mise is already used in codex and it supports asdf plugins it can be used instead
# make sure mise + its shims are on PATH now and later
echo 'export PATH=$HOME/.local/bin:$PATH' >> ~/.bashrc
echo 'export PATH=$HOME/.local/share/mise/shims:$PATH' >> ~/.bashrc
echo 'export HEX_CACERTS_PATH=$CODEX_PROXY_CERT' >> ~/.bashrc
export PATH=$HOME/.local/bin:$PATH
export PATH=$HOME/.local/share/mise/shims:$PATH
export HEX_CACERTS_PATH=$CODEX_PROXY_CERT
# plugins (mise can use asdf-style plugins)
mise plugins install erlang https://github.com/michallepicki/asdf-erlang-prebuilt-ubuntu-24.04.git || true
mise plugins install elixir https://github.com/mise-plugins/mise-elixir.git
# tool installs + set as global (equivalent to asdf --home)
mise install erlang@28.0.2
mise use --global erlang@28.0.2
mise install elixir@1.18.4-otp-28
mise use --global elixir@1.18.4-otp-28
# use hex fork with a workaround for httpc bug https://github.com/erlang/otp/issues/10065
mix archive.install --force github 650health/hex branch latest
# mix local.rebar doesn't work on Codex likely because it's not respecting HEX_CACERTS_PATH env var.
# TODO investigate this further
# install rebar manually as a temporary workaround
curl -L -o rebar3 https://s3.amazonaws.com/rebar3/rebar3
chmod +x ./rebar3
./rebar3 local install
export PATH=/root/.cache/rebar3/bin:$PATH
mix local.rebar rebar3 "$(which rebar3)"
mix deps.get
mix compile