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/// Wrapper around [`tokio::process::Command`]
pub struct Command {
inner: tokio::process::Command,
stdin: bool,
stdout: bool,
stderr: bool,
pre_exec_set: bool,
pre_exec: Option<
Box<dyn FnMut() -> std::io::Result<()> + Send + Sync + 'static>,
>,
}
impl Command {
/// See [`tokio::process::Command::new`]
pub fn new<S: AsRef<std::ffi::OsStr>>(program: S) -> Self {
Self {
inner: tokio::process::Command::new(program),
stdin: false,
stdout: false,
stderr: false,
pre_exec_set: false,
pre_exec: None,
}
}
/// See [`tokio::process::Command::arg`]
pub fn arg<S: AsRef<std::ffi::OsStr>>(&mut self, arg: S) -> &mut Self {
self.inner.arg(arg);
self
}
/// See [`tokio::process::Command::args`]
pub fn args<I, S>(&mut self, args: I) -> &mut Self
where
I: IntoIterator<Item = S>,
S: AsRef<std::ffi::OsStr>,
{
self.inner.args(args);
self
}
/// See [`tokio::process::Command::env`]
pub fn env<K, V>(&mut self, key: K, val: V) -> &mut Self
where
K: AsRef<std::ffi::OsStr>,
V: AsRef<std::ffi::OsStr>,
{
self.inner.env(key, val);
self
}
/// See [`tokio::process::Command::envs`]
pub fn envs<I, K, V>(&mut self, vars: I) -> &mut Self
where
I: IntoIterator<Item = (K, V)>,
K: AsRef<std::ffi::OsStr>,
V: AsRef<std::ffi::OsStr>,
{
self.inner.envs(vars);
self
}
/// See [`tokio::process::Command::env_remove`]
pub fn env_remove<K: AsRef<std::ffi::OsStr>>(
&mut self,
key: K,
) -> &mut Self {
self.inner.env_remove(key);
self
}
/// See [`tokio::process::Command::env_clear`]
pub fn env_clear(&mut self) -> &mut Self {
self.inner.env_clear();
self
}
/// See [`tokio::process::Command::current_dir`]
pub fn current_dir<P: AsRef<std::path::Path>>(
&mut self,
dir: P,
) -> &mut Self {
self.inner.current_dir(dir);
self
}
/// See [`tokio::process::Command::stdin`]
pub fn stdin<T: Into<std::process::Stdio>>(
&mut self,
cfg: T,
) -> &mut Self {
self.stdin = true;
self.inner.stdin(cfg);
self
}
/// See [`tokio::process::Command::stdout`]
pub fn stdout<T: Into<std::process::Stdio>>(
&mut self,
cfg: T,
) -> &mut Self {
self.stdout = true;
self.inner.stdout(cfg);
self
}
/// See [`tokio::process::Command::stderr`]
pub fn stderr<T: Into<std::process::Stdio>>(
&mut self,
cfg: T,
) -> &mut Self {
self.stderr = true;
self.inner.stderr(cfg);
self
}
/// Executes the command as a child process via
/// [`tokio::process::Command::spawn`] on the given pty. The pty will be
/// attached to all of `stdin`, `stdout`, and `stderr` of the child,
/// unless those file descriptors were previously overridden through calls
/// to [`stdin`](Self::stdin), [`stdout`](Self::stdout), or
/// [`stderr`](Self::stderr). The newly created child process will also be
/// made the session leader of a new session, and will have the given
/// pty set as its controlling terminal.
///
/// # Errors
/// Returns an error if we fail to allocate new file descriptors for
/// attaching the pty to the child process, or if we fail to spawn the
/// child process (see the documentation for
/// [`tokio::process::Command::spawn`]), or if we fail to make the child a
/// session leader or set its controlling terminal.
pub fn spawn(
&mut self,
pts: &crate::Pts,
) -> crate::Result<tokio::process::Child> {
let (stdin, stdout, stderr) = pts.0.setup_subprocess()?;
if !self.stdin {
self.inner.stdin(stdin);
}
if !self.stdout {
self.inner.stdout(stdout);
}
if !self.stderr {
self.inner.stderr(stderr);
}
let mut session_leader = pts.0.session_leader();
// Safety: setsid() is an async-signal-safe function and ioctl() is a
// raw syscall (which is inherently async-signal-safe).
if let Some(mut custom) = self.pre_exec.take() {
unsafe {
self.inner.pre_exec(move || {
session_leader()?;
custom()?;
Ok(())
})
};
} else if !self.pre_exec_set {
unsafe { self.inner.pre_exec(session_leader) };
}
self.pre_exec_set = true;
Ok(self.inner.spawn()?)
}
/// See [`tokio::process::Command::uid`]
pub fn uid(&mut self, id: u32) -> &mut Self {
self.inner.uid(id);
self
}
/// See [`tokio::process::Command::gid`]
pub fn gid(&mut self, id: u32) -> &mut Self {
self.inner.gid(id);
self
}
/// See [`tokio::process::Command::pre_exec`]
#[allow(clippy::missing_safety_doc)]
pub unsafe fn pre_exec<F>(&mut self, f: F) -> &mut Self
where
F: FnMut() -> std::io::Result<()> + Send + Sync + 'static,
{
self.pre_exec = Some(Box::new(f));
self
}
/// See [`tokio::process::Command::arg0`]
pub fn arg0<S>(&mut self, arg: S) -> &mut Self
where
S: AsRef<std::ffi::OsStr>,
{
self.inner.arg0(arg);
self
}
}
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