Can't use system as default with --use-on-cd and --version-file-strategy recursive

[NicolasWebDev]

Hi,

With eval "$(fnm env --version-file-strategy recursive --use-on-cd)" on my bashrc and system set as default, when opening a shell I have the following error:

error: Could not find any version to use. Maybe you don't have a default version set?
Try running `fnm default <VERSION>` to set one, or create a .node-version file inside your project to declare a Node.js version.

Creating a .node-version with "system" in my home directory doesn't solve the problem.

If I remove one of both flags, then it works. If I set default to another version, then it works. fnm default system doesn't give any error. fnm use system either.

I am using fnm-bin 1.31.0 on arch.

My use case is that I would like to always use the system version of node, and only use fnm for my work and personal projects.
Thus I can globally always have the version of node auto-update, through my package manager.

[sarmong]

Same problem.

[aquacash5]

After looking over the code, this error seems to come from the fact that --version-file-strategy recursive runs on every cd, not just the ones that it may be useful like --version-file-strategy local.

Local:

__fnm_use_if_file_found() {{
    if [[ -f .node-version || -f .nvmrc ]]; then
        fnm use --silent-if-unchanged
    fi
}}

__fnmcd() {{
    \cd "$@" || return $?
    __fnm_use_if_file_found
}}

alias cd=__fnmcd

Recursive:

__fnm_use_if_file_found() {{
    fnm use --silent-if-unchanged
}}

__fnmcd() {{
    \cd "$@" || return $?
    __fnm_use_if_file_found
}}

alias cd=__fnmcd

---

A solution is to suppress the CantInferVersion error if silent_if_unchanged is true. Instead fnm could add a debug line saying that fnm is suppressing the error due to the use of silent_if_unchanged. This would only be visible when the user sets the RUST_LOG environment variable.

Technically, if fnm does not find a version, fnm does not change the version, so fnm could silence the error with silent_if_unchanged.

This is wrong and unnecessary.

[aquacash5]

The issue is if you make your default system. On *nix systems, fnm sets the default alias to symlink to /dev/null/installation. When fnm tries to get the default version, fnm calls canonicalize on that symlink.

Since canonicalize follows symlinks, we get a NotADirectory error; Instead of, the system alias.