kittycad update is broken on Linux

[lf94]

@greg-kcio encountered a bug when trying to update on Ubuntu. The error is:

No such file or directory (os error 2)

I've attached the strace, but it points to some weird reading of a symlink to the executable itself.

Quickly searching the code, I'm pretty sure it's this line:

// src/cmd_update.rs:30
let current_binary_path = std::env::current_exe()?;

strace.txt

I get the same error on Arch Linux.

[lf94]

Well I wasn't too far off: issue is actually:

// src/cmd_update.rs:15
if crate::update::is_under_homebrew()? {

Which I've further narrowed to:

let output = std::process::Command::new("brew").args(vec!["--prefix"]).output()?;