1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
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);
}
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::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()
.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 {
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()
.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 {
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()
.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 {
drop(unsafe { async_std::fs::File::from_raw_fd(*fd) });
}
}
self.fds.insert(2.as_raw_fd(), stderr.into_raw_fd());
}
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 {
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 {
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 {
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() {
unsafe { cmd.pre_exec(pre_exec) };
}
}
}
impl Drop for Io {
fn drop(&mut self) {
for fd in self.fds.values() {
if *fd > 2 {
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())
}
// can't use async_recursion because it enforces a 'static lifetime
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)
}
})
}
}
|
