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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! Provides utilities for searching the system path.
use std::env;
use std::path::{Path, PathBuf};
#[cfg(unix)]
fn is_executable(path: &Path) -> bool {
use std::fs;
use std::os::unix::fs::PermissionsExt;
// Permissions are a set of four 4-bit bitflags, represented by a single octal
// digit. The lowest bit of each of the last three values represents the
// executable permission for all, group and user, repsectively. We assume the
// file is executable if any of these are set.
match fs::metadata(path).ok() {
Some(meta) => meta.permissions().mode() & 0o111 != 0,
None => false,
}
}
#[cfg(not(unix))]
fn is_executable(_: &Path) -> bool {
true
}
/// Determines if the path is an executable binary. That is, if it exists, is
/// a file, and is executable where applicable.
pub fn is_binary(path: &Path) -> bool {
path.exists() && path.is_file() && is_executable(path)
}
/// Searches the system path (`PATH`) for an executable binary and returns the
/// first match, or `None` if not found.
pub fn find_binary(binary_name: &str) -> Option<PathBuf> {
env::var_os("PATH").and_then(|path_env| {
for mut path in env::split_paths(&path_env) {
path.push(binary_name);
if is_binary(&path) {
return Some(path);
}
}
None
})
}
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