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|
use async_std::io::{ReadExt as _, WriteExt as _};
use std::os::unix::io::{AsRawFd as _, FromRawFd as _, IntoRawFd as _};
pub struct Command {
exe: crate::parse::Exe,
f: super::Builtin,
io: Io,
}
impl Command {
pub fn new(exe: crate::parse::Exe) -> Result<Self, crate::parse::Exe> {
if let Some(f) = super::BUILTINS.get(exe.exe()) {
Ok(Self {
exe,
f,
io: Io::new(),
})
} else {
Err(exe)
}
}
pub fn stdin(&mut self, fh: std::fs::File) {
self.io.set_stdin(fh);
}
pub fn stdout(&mut self, fh: std::fs::File) {
self.io.set_stdout(fh);
}
pub fn stderr(&mut self, fh: std::fs::File) {
self.io.set_stderr(fh);
}
// Safety: see pre_exec in async_std::os::unix::process::CommandExt (this
// is just a wrapper)
pub unsafe fn pre_exec<F>(&mut self, f: F)
where
F: 'static + FnMut() -> std::io::Result<()> + Send + Sync,
{
self.io.pre_exec(f);
}
pub fn spawn(self, env: &crate::Env) -> anyhow::Result<Child> {
let Self { f, exe, io } = self;
(f)(exe, env, io)
}
}
pub struct Io {
fds: std::collections::HashMap<
std::os::unix::io::RawFd,
std::os::unix::io::RawFd,
>,
pre_exec: Option<
Box<dyn 'static + FnMut() -> std::io::Result<()> + Send + Sync>,
>,
}
impl Io {
fn new() -> Self {
let mut fds = std::collections::HashMap::new();
fds.insert(0.as_raw_fd(), 0.as_raw_fd());
fds.insert(1.as_raw_fd(), 1.as_raw_fd());
fds.insert(2.as_raw_fd(), 2.as_raw_fd());
Self {
fds,
pre_exec: None,
}
}
fn stdin(&self) -> Option<async_std::fs::File> {
self.fds
.get(&0.as_raw_fd())
.copied()
// Safety: TODO this is likely unsafe
.map(|fd| unsafe { async_std::fs::File::from_raw_fd(fd) })
}
fn set_stdin<T: std::os::unix::io::IntoRawFd>(&mut self, stdin: T) {
if let Some(fd) = self.fds.get(&0.as_raw_fd()) {
if *fd > 2 {
// Safety: TODO this is likely unsafe
drop(unsafe { async_std::fs::File::from_raw_fd(*fd) });
}
}
self.fds.insert(0.as_raw_fd(), stdin.into_raw_fd());
}
fn stdout(&self) -> Option<async_std::fs::File> {
self.fds
.get(&1.as_raw_fd())
.copied()
// Safety: TODO this is likely unsafe
.map(|fd| unsafe { async_std::fs::File::from_raw_fd(fd) })
}
fn set_stdout<T: std::os::unix::io::IntoRawFd>(&mut self, stdout: T) {
if let Some(fd) = self.fds.get(&1.as_raw_fd()) {
if *fd > 2 {
// Safety: TODO this is likely unsafe
drop(unsafe { async_std::fs::File::from_raw_fd(*fd) });
}
}
self.fds.insert(1.as_raw_fd(), stdout.into_raw_fd());
}
fn stderr(&self) -> Option<async_std::fs::File> {
self.fds
.get(&2.as_raw_fd())
.copied()
// Safety: TODO this is likely unsafe
.map(|fd| unsafe { async_std::fs::File::from_raw_fd(fd) })
}
fn set_stderr<T: std::os::unix::io::IntoRawFd>(&mut self, stderr: T) {
if let Some(fd) = self.fds.get(&2.as_raw_fd()) {
if *fd > 2 {
// Safety: TODO this is likely unsafe
drop(unsafe { async_std::fs::File::from_raw_fd(*fd) });
}
}
self.fds.insert(2.as_raw_fd(), stderr.into_raw_fd());
}
// Safety: see pre_exec in async_std::os::unix::process::CommandExt (this
// is just a wrapper)
pub unsafe fn pre_exec<F>(&mut self, f: F)
where
F: 'static + FnMut() -> std::io::Result<()> + Send + Sync,
{
self.pre_exec = Some(Box::new(f));
}
pub async fn read_stdin(&self, buf: &mut [u8]) -> anyhow::Result<usize> {
if let Some(mut fh) = self.stdin() {
let res = fh.read(buf).await;
let _ = fh.into_raw_fd();
Ok(res?)
} else {
Ok(0)
}
}
pub async fn write_stdout(&self, buf: &[u8]) -> anyhow::Result<()> {
if let Some(mut fh) = self.stdout() {
let res = fh.write_all(buf).await;
let _ = fh.into_raw_fd();
Ok(res.map(|_| ())?)
} else {
Ok(())
}
}
pub async fn write_stderr(&self, buf: &[u8]) -> anyhow::Result<()> {
if let Some(mut fh) = self.stderr() {
let res = fh.write_all(buf).await;
let _ = fh.into_raw_fd();
Ok(res.map(|_| ())?)
} else {
Ok(())
}
}
pub fn setup_command(mut self, cmd: &mut crate::pipeline::Command) {
if let Some(stdin) = self.stdin() {
let stdin = stdin.into_raw_fd();
if stdin != 0 {
// Safety: TODO this is likely unsafe
cmd.stdin(unsafe { std::fs::File::from_raw_fd(stdin) });
self.fds.remove(&0.as_raw_fd());
}
}
if let Some(stdout) = self.stdout() {
let stdout = stdout.into_raw_fd();
if stdout != 1 {
// Safety: TODO this is likely unsafe
cmd.stdout(unsafe { std::fs::File::from_raw_fd(stdout) });
self.fds.remove(&1.as_raw_fd());
}
}
if let Some(stderr) = self.stderr() {
let stderr = stderr.into_raw_fd();
if stderr != 2 {
// Safety: TODO this is likely unsafe
cmd.stderr(unsafe { std::fs::File::from_raw_fd(stderr) });
self.fds.remove(&2.as_raw_fd());
}
}
if let Some(pre_exec) = self.pre_exec.take() {
// Safety: pre_exec can only have been set by calling the pre_exec
// method, which is itself unsafe, so the safety comments at the
// point where that is called are the relevant ones
unsafe { cmd.pre_exec(pre_exec) };
}
}
}
impl Drop for Io {
fn drop(&mut self) {
for fd in self.fds.values() {
if *fd > 2 {
// Safety: TODO this is likely unsafe
drop(unsafe { std::fs::File::from_raw_fd(*fd) });
}
}
}
}
pub struct Child<'a> {
fut: std::pin::Pin<
Box<
dyn std::future::Future<Output = std::process::ExitStatus>
+ Sync
+ Send
+ 'a,
>,
>,
wrapped_child: Option<Box<crate::pipeline::Child<'a>>>,
}
impl<'a> Child<'a> {
pub fn new_fut<F>(fut: F) -> Self
where
F: std::future::Future<Output = std::process::ExitStatus>
+ Sync
+ Send
+ 'a,
{
Self {
fut: Box::pin(fut),
wrapped_child: None,
}
}
pub fn new_wrapped(child: crate::pipeline::Child<'a>) -> Self {
Self {
fut: Box::pin(async move { unreachable!() }),
wrapped_child: Some(Box::new(child)),
}
}
pub fn id(&self) -> Option<u32> {
self.wrapped_child.as_ref().and_then(|cmd| cmd.id())
}
pub fn status(
self,
) -> std::pin::Pin<
Box<
dyn std::future::Future<
Output = anyhow::Result<async_std::process::ExitStatus>,
> + Send
+ Sync
+ 'a,
>,
> {
Box::pin(async move {
if let Some(child) = self.wrapped_child {
child.status().await
} else {
Ok(self.fut.await)
}
})
}
}
|
