82 lines
2.7 KiB
Rust
82 lines
2.7 KiB
Rust
use super::Cmd;
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use bitflags::BitFlags;
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use clap::{Arg, Command};
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use mode::Bit;
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use std::{env, fs::File, os::unix::prelude::MetadataExt, path::PathBuf, process};
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#[derive(Debug)]
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pub struct Which;
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impl Cmd for Which {
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fn cli(&self) -> clap::Command {
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Command::new("which")
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.about("Write the full path of COMMAND(s) to standard output")
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.author("Nathan Fisher")
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.version(env!("CARGO_PKG_VERSION"))
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.arg(Arg::new("COMMAND").num_args(1..))
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}
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fn run(&self, matches: &clap::ArgMatches) -> Result<(), Box<dyn std::error::Error>> {
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let rawpath = if let Ok(p) = env::var("PATH") {
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p
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} else {
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"/usr/bin:/bin".to_string()
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};
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let path: Vec<_> = rawpath.split(':').collect();
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let mut failures = 0;
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if let Some(commands) = matches.get_many::<String>("COMMAND") {
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for command in commands {
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if let Some(p) = which(command, &path) {
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println!("{p}");
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} else {
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println!("which: no {command} in ({})", &rawpath);
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failures += 1;
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}
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}
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} else {
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let _res = self.cli().print_help();
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process::exit(255);
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}
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if failures > 0 {
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process::exit(failures);
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} else {
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Ok(())
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}
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}
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fn path(&self) -> Option<shitbox::Path> {
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Some(shitbox::Path::UsrBin)
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}
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}
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fn which(command: &str, path: &[&str]) -> Option<String> {
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for p in path {
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let file = [p, command].iter().collect::<PathBuf>();
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if file.exists() {
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if let Ok(exe) = File::open(&file) {
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if let Ok(meta) = exe.metadata() {
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let mode = meta.mode();
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let myuid = unsafe { libc::geteuid() };
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let mygroups = pw::get_gids();
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// we own the file and it has u+x
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if myuid == meta.uid() && mode.contains(Bit::UExec) {
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return Some(format!("{}", file.display()));
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// file has ug+x
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} else if mode.contains(Bit::UExec | Bit::GExec) {
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if let Ok(groups) = mygroups {
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// one of our groups owns the file
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if groups.contains(&meta.gid()) {
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return Some(format!("{}", file.display()));
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}
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}
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// the file has uga+x
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} else if mode & 0o111 != 0 {
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return Some(format!("{}", file.display()));
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}
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}
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}
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}
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}
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None
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}
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