Panic if directory named Gemfile exists

[adamcohen2]

Summary

mise 2025.1.9 linux-arm64 (b915c4f 2025-01-17) panics if a directory named Gemfile exists.

I'm currently using mise on a project that has a Gemfile directory, which contains code for parsing ruby gemfiles. I can work around this by renaming the folder to something else, but I think mise should be updated to handle this edge case.

Steps to reproduce

1. Run a docker container:

   docker run -it --rm alpine:latest sh

2. Install mise

   / # wget -O - https://mise.run | sh

3. Run mise

   / # ~/.local/bin/mise ls
   Tool  Version  Source  Requested   

4. Create Gemfile directory

   / # mkdir Gemfile

5. Run mise again, panic occurs:

   / # ~/.local/bin/mise ls
   
   mise ERROR error parsing config file: /Gemfile
   mise ERROR failed read_to_string: /Gemfile
   mise ERROR Is a directory (os error 21)
   mise ERROR Run with --verbose or MISE_VERBOSE=1 for more information   

What is the current bug behavior?

mise panics

What is the expected correct behavior?

mise should not panic

Output of mise doctor

Click to expand

/ # ~/.local/bin/mise doctor
version: 2025.1.9 linux-arm64 (b915c4f 2025-01-17)
activated: no
shims_on_path: no

build_info:
  Target: aarch64-unknown-linux-musl
  Features: DEFAULT, NATIVE_TLS, OPENSSL
  Built: Fri, 17 Jan 2025 19:43:12 +0000
  Rust Version: rustc 1.83.0 (90b35a623 2024-11-26)
  Profile: release

shell:
  bash
  failed to get shell version: No such file or directory (os error 2)

dirs:
  cache: ~/.cache/mise
  config: ~/.config/mise
  data: ~/.local/share/mise
  shims: ~/.local/share/mise/shims
  state: ~/.local/state/mise

config_files:

ignored_config_files: (none)

backends:
  aqua
  asdf
  cargo
  core
  dotnet
  gem
  go
  npm
  pipx
  spm
  ubi
  vfox

plugins:

toolset:

path:
  /usr/local/sbin
  /usr/local/bin
  /usr/sbin
  /usr/bin
  /sbin
  /bin

env_vars:
  (none)

2 problems found:

1. mise is not activated, run mise help activate or
   read documentation at https://mise.jdx.dev for activation instructions.
   Alternatively, add the shims directory ~/.local/share/mise/shims to PATH.
   Using the shims directory is preferred for non-interactive setups.

2. failed to load settings: No such file or directory (os error 2)

Possible fixes

Update mise so it doesn't attempt to parse Gemfile if it's a directory.

[adamcohen2]

Fixed by #4256