Interrupted downloads are being treated as complete installs

[mselee]

If you start installing a version of a language (e.g. Erlang) and for some reason it gets interrupted (e.g. Ctrl-C), it will be treated as a complete installation, meaning:

$ asdf install erlang 20.0
erlang 20.0 is already installed

But

$ iex
No such command in 20.0 of erlang

And .asdf/installs/erlang/20.0/ path is empty.

The workaround is simple: uninstall erlang and reinstall it again but that's not ideal unless you are previously aware of this issue.

[danhper]

We are actually checking for the return code in asdf, so this is more of a per-plugin issue.
I know some plugins do have this issue, let's open an issue in asdf-erlang to start with.

[Stratus3D]

I see the bug in asdf-erlang. Thanks for reporting!

[danhper]

There is indeed an issue in the asdf-erlang plugin, but I just realized that the situation is a little when receiving the sigint signal. We do need to trap it somewhere if we want to cleanup cleanly, so I added the logic to do so inside the install command.
We still need to handle download failures in asdf-erlang.