Travis CI + OCaml CI Scripts: There already is an installed switch named

Ecosystem
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1

I’m using the ocaml/ocaml-ci-scripts installation script on Travis CI to setup an OCaml environment. The script has been working fine for months out of the box, but suddently, I’m starting to get [ERROR] There already is an installed switch named ocaml-base-compiler.4.08.1. I’m using Travis CI’s caching mechanism to cache ~/.opam. This was working fine previously, but now it’s erroring. Not sure why since nothing has changed within the script or OPAM recently. I might just modify the script to check if the version is already installed, but wanted to see if anyone else has seem something similar and had any better ideas. Thanks!

2

Welcome @ahanmal! It would be helpful to see your Travis yaml file, or a link to the repository and a failing log to debug this.

3

Here is a snippet of the relevant lines of our .travis.yml file:

dist: bionic
language: python
python:
- '3.7'
env:
- OCAML_VERSION=4.08
cache:
  pip: true
  directories:
  - "$HOME/.opam"
before_install:
- curl -L https://raw.githubusercontent.com/ocaml/ocaml-ci-scripts/master/.travis-ocaml.sh
  | sh
- eval $(opam config env)

The logfile is available here: https://gist.github.com/ahanmal/d8e68f9c7df89dacb72616a0bf3d0d3a

Thanks!

4

It’s probably the cache. Try removing that and see if it works.

5

So if I bust the cache, it works fine. But ideally I’d like to maintain a because it speeds up our builds 4x. Any thoughts about maintaining a cache?

6

Appears that this was actually an issue. ocaml/ocaml-ci-scripts#bfd88d1 fixes the issue.