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-rw-r--r--crates/ra_env/src/lib.rs66
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diff --git a/crates/ra_env/src/lib.rs b/crates/ra_env/src/lib.rs
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1//! This crate contains a single public function
2//! [`get_path_for_executable`](fn.get_path_for_executable.html).
3//! See docs there for more information.
4
5use anyhow::{bail, Result};
6use std::env;
7use std::path::{Path, PathBuf};
8use std::process::Command;
9
10/// Return a `PathBuf` to use for the given executable.
11///
12/// E.g., `get_path_for_executable("cargo")` may return just `cargo` if that
13/// gives a valid Cargo executable; or it may return a full path to a valid
14/// Cargo.
15pub fn get_path_for_executable(executable_name: impl AsRef<str>) -> Result<PathBuf> {
16 // The current implementation checks three places for an executable to use:
17 // 1) Appropriate environment variable (erroring if this is set but not a usable executable)
18 // example: for cargo, this checks $CARGO environment variable; for rustc, $RUSTC; etc
19 // 2) `<executable_name>`
20 // example: for cargo, this tries just `cargo`, which will succeed if `cargo` is on the $PATH
21 // 3) `~/.cargo/bin/<executable_name>`
22 // example: for cargo, this tries ~/.cargo/bin/cargo
23 // It seems that this is a reasonable place to try for cargo, rustc, and rustup
24 let executable_name = executable_name.as_ref();
25 let env_var = executable_name.to_ascii_uppercase();
26 if let Ok(path) = env::var(&env_var) {
27 if is_valid_executable(&path) {
28 Ok(path.into())
29 } else {
30 bail!(
31 "`{}` environment variable points to something that's not a valid executable",
32 env_var
33 )
34 }
35 } else {
36 if is_valid_executable(executable_name) {
37 return Ok(executable_name.into());
38 }
39 if let Some(mut path) = ::home::home_dir() {
40 path.push(".cargo");
41 path.push("bin");
42 path.push(executable_name);
43 if is_valid_executable(&path) {
44 return Ok(path);
45 }
46 }
47 // This error message may also be caused by $PATH or $CARGO/$RUSTC/etc not being set correctly
48 // for VSCode, even if they are set correctly in a terminal.
49 // On macOS in particular, launching VSCode from terminal with `code <dirname>` causes VSCode
50 // to inherit environment variables including $PATH, $CARGO, $RUSTC, etc from that terminal;
51 // but launching VSCode from Dock does not inherit environment variables from a terminal.
52 // For more discussion, see #3118.
53 bail!(
54 "Failed to find `{}` executable. Make sure `{}` is in `$PATH`, or set `${}` to point to a valid executable.",
55 executable_name, executable_name, env_var
56 )
57 }
58}
59
60/// Does the given `Path` point to a usable executable?
61///
62/// (assumes the executable takes a `--version` switch and writes to stdout,
63/// which is true for `cargo`, `rustc`, and `rustup`)
64fn is_valid_executable(p: impl AsRef<Path>) -> bool {
65 Command::new(p.as_ref()).arg("--version").output().is_ok()
66}