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// This file was derived from rust's own libstd/process.rs with the following
// copyright:
//
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
use std::ffi::OsStr;
use std::default::Default;
use std::collections::HashMap;
use std::collections::HashSet;
use std::env;
use std::path::Path;
use libc::{uid_t, gid_t};
use crate::ffi_util::ToCString;
use crate::{Command, Stdio, Fd};
impl Command {
/// Constructs a new `Command` for launching the program at
/// path `program`, with the following default configuration:
///
/// * No arguments to the program
/// * Inherit the current process's environment
/// * Inherit the current process's working directory
/// * Inherit stdin/stdout/stderr for `spawn` or `status`, but create pipes for `output`
///
/// Builder methods are provided to change these defaults and
/// otherwise configure the process.
pub fn new<S: AsRef<OsStr>>(program: S) -> Command {
Command {
filename: program.to_cstring(),
args: vec![program.to_cstring()],
environ: None,
config: Default::default(),
chroot_dir: None,
pivot_root: None,
fds: vec![
(0, Fd::inherit()),
(1, Fd::inherit()),
(2, Fd::inherit()),
].into_iter().collect(),
close_fds: Vec::new(),
id_map_commands: None,
pid_env_vars: HashSet::new(),
keep_caps: None,
before_unfreeze: None,
pre_exec: None,
}
}
/// Add an argument to pass to the program.
pub fn arg<S: AsRef<OsStr>>(&mut self, arg: S) -> &mut Command {
self.args.push(arg.to_cstring());
self
}
/// Add multiple arguments to pass to the program.
pub fn args<S: AsRef<OsStr>>(&mut self, args: &[S]) -> &mut Command {
self.args.extend(args.iter().map(ToCString::to_cstring));
self
}
// TODO(tailhook) It's only public for our run module any better way?
// TODO(tailhook) make it private
#[doc(hidden)]
pub fn init_env_map(&mut self) {
if self.environ.is_none() {
self.environ = Some(env::vars_os().collect());
}
}
/// Inserts or updates an environment variable mapping.
pub fn env<K, V>(&mut self, key: K, val: V) -> &mut Command
where K: AsRef<OsStr>, V: AsRef<OsStr>
{
self.init_env_map();
self.environ.as_mut().unwrap().insert(
key.as_ref().to_os_string(),
val.as_ref().to_os_string());
self.pid_env_vars.remove(key.as_ref());
self
}
/// Inserts or updates multiple environment variable mappings.
pub fn envs<I, K, V>(&mut self, vars: I)-> &mut Command
where I: IntoIterator<Item=(K, V)>, K: AsRef<OsStr>, V: AsRef<OsStr>
{
for (ref key, ref val) in vars {
self.init_env_map();
self.environ.as_mut().unwrap().insert(
key.as_ref().to_os_string(),
val.as_ref().to_os_string());
self.pid_env_vars.remove(key.as_ref());
}
self
}
/// Removes an environment variable mapping.
pub fn env_remove<K: AsRef<OsStr>>(&mut self, key: K) -> &mut Command {
self.init_env_map();
self.environ.as_mut().unwrap().remove(key.as_ref());
self.pid_env_vars.remove(key.as_ref());
self
}
/// Clears the entire environment map for the child process.
pub fn env_clear(&mut self) -> &mut Command {
self.environ = Some(HashMap::new());
self.pid_env_vars = HashSet::new();
self
}
/// Sets the working directory for the child process.
///
/// Note: in case of `chroot` or `pivot_root` the working directory is
/// always set to something inside the new root. Algorithm is following:
///
/// 1. If path is set to absolute path, current dir is this path *inside*
/// the chroot
/// 2. Check if chroot dir is prefix of `env::current_dir()`. If it is
/// set current directory to the suffix. Otherwise set current directory
/// to the new root dir.
/// 3. If `current_dir` is specified (and relative) set working directory
/// to the value (i.e. relative to the dir set in #2)
///
/// The `pivot_root` is treated just the same as `chroot`. I.e. we will
/// not try to set working directory inside the `old_root`, unless path
/// inside is set explicitly by this method.
///
/// At the end of the day, the ``cmd.current_dir(env::current_dir())`` is
/// not no-op if using chroot/pivot_root.
pub fn current_dir<P: AsRef<Path>>(&mut self, dir: P) -> &mut Command
{
self.config.work_dir = Some(dir.as_ref().to_cstring());
self
}
/// Configuration for the child process's stdin handle (file descriptor 0).
pub fn stdin(&mut self, cfg: Stdio) -> &mut Command {
self.fds.insert(0, cfg.to_fd(false));
self
}
/// Configuration for the child process's stdout handle (file descriptor 1).
pub fn stdout(&mut self, cfg: Stdio) -> &mut Command {
self.fds.insert(1, cfg.to_fd(true));
self
}
/// Configuration for the child process's stderr handle (file descriptor 2).
pub fn stderr(&mut self, cfg: Stdio) -> &mut Command {
self.fds.insert(2, cfg.to_fd(true));
self
}
/// Set user id of the new process. Note that it works only for root
/// process or if you also set up user namespace
pub fn uid(&mut self, id: uid_t) -> &mut Command {
self.config.uid = Some(id);
self
}
/// Set primary group id of the new process. Note that it works only for
/// root process or if you also set up user namespace
pub fn gid(&mut self, id: gid_t) -> &mut Command {
self.config.gid = Some(id);
self
}
/// Set supplementary group ids. Note that it works only for root process
/// or if you also set up user namespace
pub fn groups(&mut self, ids: Vec<gid_t>) -> &mut Command {
self.config.supplementary_gids = Some(ids);
self
}
}