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use indexmap::IndexMap;
use std::path::Path;
use std::process::Command;
use std::time::{Duration, Instant};
use anyhow::{Result, bail};
/// Output from a process execution.
#[derive(Debug, Clone)]
pub struct ProcessOutput {
pub status: i32,
pub stdout: String,
pub stderr: String,
}
/// Wrapper around `std::process::Command` for executing external programs.
///
/// Corresponds to Composer's `ProcessExecutor`.
pub struct ProcessExecutor {
timeout: Option<Duration>,
env_overrides: IndexMap<String, Option<String>>,
}
impl Default for ProcessExecutor {
fn default() -> Self {
Self::new()
}
}
impl ProcessExecutor {
pub fn new() -> Self {
Self {
timeout: None,
env_overrides: IndexMap::new(),
}
}
pub fn with_timeout(secs: u64) -> Self {
Self {
timeout: Some(Duration::from_secs(secs)),
env_overrides: IndexMap::new(),
}
}
/// Set an environment variable override for all subsequent executions.
pub fn set_env(&mut self, key: impl Into<String>, value: impl Into<String>) {
self.env_overrides.insert(key.into(), Some(value.into()));
}
/// Remove an environment variable for all subsequent executions.
pub fn remove_env(&mut self, key: impl Into<String>) {
self.env_overrides.insert(key.into(), None);
}
/// Execute a command. Does not error on non-zero exit status.
pub fn execute(&self, args: &[&str], cwd: Option<&Path>) -> Result<ProcessOutput> {
if args.is_empty() {
bail!("No command specified");
}
let mut cmd = Command::new(args[0]);
if args.len() > 1 {
cmd.args(&args[1..]);
}
if let Some(dir) = cwd {
cmd.current_dir(dir);
}
for (key, value) in &self.env_overrides {
match value {
Some(v) => {
cmd.env(key, v);
}
None => {
cmd.env_remove(key);
}
}
}
if let Some(timeout) = self.timeout {
let mut child = cmd
.stdout(std::process::Stdio::piped())
.stderr(std::process::Stdio::piped())
.spawn()?;
let start = Instant::now();
loop {
match child.try_wait()? {
Some(status) => {
let mut stdout = String::new();
let mut stderr = String::new();
if let Some(ref mut out) = child.stdout {
std::io::Read::read_to_string(out, &mut stdout)?;
}
if let Some(ref mut err) = child.stderr {
std::io::Read::read_to_string(err, &mut stderr)?;
}
return Ok(ProcessOutput {
status: status.code().unwrap_or(-1),
stdout,
stderr,
});
}
None => {
if start.elapsed() > timeout {
let _ = child.kill();
bail!("Process timed out after {} seconds", timeout.as_secs());
}
std::thread::sleep(Duration::from_millis(50));
}
}
}
} else {
let output = cmd.output()?;
Ok(ProcessOutput {
status: output.status.code().unwrap_or(-1),
stdout: String::from_utf8_lossy(&output.stdout).into_owned(),
stderr: String::from_utf8_lossy(&output.stderr).into_owned(),
})
}
}
/// Execute a command, returning an error if the exit status is non-zero.
pub fn execute_checked(&self, args: &[&str], cwd: Option<&Path>) -> Result<ProcessOutput> {
let output = self.execute(args, cwd)?;
if output.status != 0 {
bail!(
"Command `{}` failed with exit code {}\nstdout: {}\nstderr: {}",
args.join(" "),
output.status,
output.stdout.trim(),
output.stderr.trim(),
);
}
Ok(output)
}
/// Split output into non-empty lines.
pub fn split_lines(output: &str) -> Vec<&str> {
output.lines().filter(|l| !l.is_empty()).collect()
}
}
|
