src/libstd/process.rs

   1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 //! Working with processes.
  12
  13 #![stable(feature = "process", since = "1.0.0")]
  14 #![allow(non_upper_case_globals)]
  15
  16 use prelude::v1::*;
  17 use io::prelude::*;
  18
  19 use ffi::OsStr;
  20 use fmt;
  21 use io::{self, Error, ErrorKind};
  22 use path;
  23 use sync::mpsc::{channel, Receiver};
  24 use sys::pipe::{self, AnonPipe};
  25 use sys::process::Command as CommandImp;
  26 use sys::process::Process as ProcessImp;
  27 use sys::process::ExitStatus as ExitStatusImp;
  28 use sys::process::Stdio as StdioImp2;
  29 use sys_common::{AsInner, AsInnerMut};
  30 use thread;
  31
  32 /// Representation of a running or exited child process.
  33 ///
  34 /// This structure is used to represent and manage child processes. A child
  35 /// process is created via the `Command` struct, which configures the spawning
  36 /// process and can itself be constructed using a builder-style interface.
  37 ///
  38 /// # Examples
  39 ///
  40 /// ```should_panic
  41 /// use std::process::Command;
  42 ///
  43 /// let mut child = Command::new("/bin/cat")
  44 ///                         .arg("file.txt")
  45 ///                         .spawn()
  46 ///                         .unwrap_or_else(|e| { panic!("failed to execute child: {}", e) });
  47 ///
  48 /// let ecode = child.wait()
  49 ///                  .unwrap_or_else(|e| { panic!("failed to wait on child: {}", e) });
  50 ///
  51 /// assert!(ecode.success());
  52 /// ```
  53 #[stable(feature = "process", since = "1.0.0")]
  54 pub struct Child {
  55     handle: ProcessImp,
  56
  57     /// None until wait() or wait_with_output() is called.
  58     status: Option<ExitStatusImp>,
  59
  60     /// The handle for writing to the child's stdin, if it has been captured
  61     #[stable(feature = "process", since = "1.0.0")]
  62     pub stdin: Option<ChildStdin>,
  63
  64     /// The handle for reading from the child's stdout, if it has been captured
  65     #[stable(feature = "process", since = "1.0.0")]
  66     pub stdout: Option<ChildStdout>,
  67
  68     /// The handle for reading from the child's stderr, if it has been captured
  69     #[stable(feature = "process", since = "1.0.0")]
  70     pub stderr: Option<ChildStderr>,
  71 }
  72
  73 /// A handle to a child procesess's stdin
  74 #[stable(feature = "process", since = "1.0.0")]
  75 pub struct ChildStdin {
  76     inner: AnonPipe
  77 }
  78
  79 #[stable(feature = "process", since = "1.0.0")]
  80 impl Write for ChildStdin {
  81     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
  82         self.inner.write(buf)
  83     }
  84
  85     fn flush(&mut self) -> io::Result<()> {
  86         Ok(())
  87     }
  88 }
  89
  90 /// A handle to a child procesess's stdout
  91 #[stable(feature = "process", since = "1.0.0")]
  92 pub struct ChildStdout {
  93     inner: AnonPipe
  94 }
  95
  96 #[stable(feature = "process", since = "1.0.0")]
  97 impl Read for ChildStdout {
  98     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
  99         self.inner.read(buf)
 100     }
 101 }
 102
 103 /// A handle to a child procesess's stderr
 104 #[stable(feature = "process", since = "1.0.0")]
 105 pub struct ChildStderr {
 106     inner: AnonPipe
 107 }
 108
 109 #[stable(feature = "process", since = "1.0.0")]
 110 impl Read for ChildStderr {
 111     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
 112         self.inner.read(buf)
 113     }
 114 }
 115
 116 /// The `Command` type acts as a process builder, providing fine-grained control
 117 /// over how a new process should be spawned. A default configuration can be
 118 /// generated using `Command::new(program)`, where `program` gives a path to the
 119 /// program to be executed. Additional builder methods allow the configuration
 120 /// to be changed (for example, by adding arguments) prior to spawning:
 121 ///
 122 /// ```
 123 /// use std::process::Command;
 124 ///
 125 /// let output = Command::new("sh")
 126 ///                      .arg("-c")
 127 ///                      .arg("echo hello")
 128 ///                      .output()
 129 ///                      .unwrap_or_else(|e| { panic!("failed to execute process: {}", e) });
 130 /// let hello = output.stdout;
 131 /// ```
 132 #[stable(feature = "process", since = "1.0.0")]
 133 pub struct Command {
 134     inner: CommandImp,
 135
 136     // Details explained in the builder methods
 137     stdin: Option<StdioImp>,
 138     stdout: Option<StdioImp>,
 139     stderr: Option<StdioImp>,
 140 }
 141
 142 impl Command {
 143     /// Constructs a new `Command` for launching the program at
 144     /// path `program`, with the following default configuration:
 145     ///
 146     /// * No arguments to the program
 147     /// * Inherit the current process's environment
 148     /// * Inherit the current process's working directory
 149     /// * Inherit stdin/stdout/stderr for `spawn` or `status`, but create pipes for `output`
 150     ///
 151     /// Builder methods are provided to change these defaults and
 152     /// otherwise configure the process.
 153     #[stable(feature = "process", since = "1.0.0")]
 154     pub fn new<S: AsRef<OsStr>>(program: S) -> Command {
 155         Command {
 156             inner: CommandImp::new(program.as_ref()),
 157             stdin: None,
 158             stdout: None,
 159             stderr: None,
 160         }
 161     }
 162
 163     /// Add an argument to pass to the program.
 164     #[stable(feature = "process", since = "1.0.0")]
 165     pub fn arg<S: AsRef<OsStr>>(&mut self, arg: S) -> &mut Command {
 166         self.inner.arg(arg.as_ref());
 167         self
 168     }
 169
 170     /// Add multiple arguments to pass to the program.
 171     #[stable(feature = "process", since = "1.0.0")]
 172     pub fn args<S: AsRef<OsStr>>(&mut self, args: &[S]) -> &mut Command {
 173         self.inner.args(args.iter().map(AsRef::as_ref));
 174         self
 175     }
 176
 177     /// Inserts or updates an environment variable mapping.
 178     ///
 179     /// Note that environment variable names are case-insensitive (but case-preserving) on Windows,
 180     /// and case-sensitive on all other platforms.
 181     #[stable(feature = "process", since = "1.0.0")]
 182     pub fn env<K, V>(&mut self, key: K, val: V) -> &mut Command
 183         where K: AsRef<OsStr>, V: AsRef<OsStr>
 184     {
 185         self.inner.env(key.as_ref(), val.as_ref());
 186         self
 187     }
 188
 189     /// Removes an environment variable mapping.
 190     #[stable(feature = "process", since = "1.0.0")]
 191     pub fn env_remove<K: AsRef<OsStr>>(&mut self, key: K) -> &mut Command {
 192         self.inner.env_remove(key.as_ref());
 193         self
 194     }
 195
 196     /// Clears the entire environment map for the child process.
 197     #[stable(feature = "process", since = "1.0.0")]
 198     pub fn env_clear(&mut self) -> &mut Command {
 199         self.inner.env_clear();
 200         self
 201     }
 202
 203     /// Sets the working directory for the child process.
 204     #[stable(feature = "process", since = "1.0.0")]
 205     pub fn current_dir<P: AsRef<path::Path>>(&mut self, dir: P) -> &mut Command {
 206         self.inner.cwd(dir.as_ref().as_ref());
 207         self
 208     }
 209
 210     /// Configuration for the child process's stdin handle (file descriptor 0).
 211     #[stable(feature = "process", since = "1.0.0")]
 212     pub fn stdin(&mut self, cfg: Stdio) -> &mut Command {
 213         self.stdin = Some(cfg.0);
 214         self
 215     }
 216
 217     /// Configuration for the child process's stdout handle (file descriptor 1).
 218     #[stable(feature = "process", since = "1.0.0")]
 219     pub fn stdout(&mut self, cfg: Stdio) -> &mut Command {
 220         self.stdout = Some(cfg.0);
 221         self
 222     }
 223
 224     /// Configuration for the child process's stderr handle (file descriptor 2).
 225     #[stable(feature = "process", since = "1.0.0")]
 226     pub fn stderr(&mut self, cfg: Stdio) -> &mut Command {
 227         self.stderr = Some(cfg.0);
 228         self
 229     }
 230
 231     fn spawn_inner(&self, default_io: StdioImp) -> io::Result<Child> {
 232         let (their_stdin, our_stdin) = try!(
 233             setup_io(self.stdin.as_ref().unwrap_or(&default_io), true)
 234         );
 235         let (their_stdout, our_stdout) = try!(
 236             setup_io(self.stdout.as_ref().unwrap_or(&default_io), false)
 237         );
 238         let (their_stderr, our_stderr) = try!(
 239             setup_io(self.stderr.as_ref().unwrap_or(&default_io), false)
 240         );
 241
 242         match ProcessImp::spawn(&self.inner, their_stdin, their_stdout, their_stderr) {
 243             Err(e) => Err(e),
 244             Ok(handle) => Ok(Child {
 245                 handle: handle,
 246                 status: None,
 247                 stdin: our_stdin.map(|fd| ChildStdin { inner: fd }),
 248                 stdout: our_stdout.map(|fd| ChildStdout { inner: fd }),
 249                 stderr: our_stderr.map(|fd| ChildStderr { inner: fd }),
 250             })
 251         }
 252     }
 253
 254     /// Executes the command as a child process, returning a handle to it.
 255     ///
 256     /// By default, stdin, stdout and stderr are inherited by the parent.
 257     #[stable(feature = "process", since = "1.0.0")]
 258     pub fn spawn(&mut self) -> io::Result<Child> {
 259         self.spawn_inner(StdioImp::Inherit)
 260     }
 261
 262     /// Executes the command as a child process, waiting for it to finish and
 263     /// collecting all of its output.
 264     ///
 265     /// By default, stdin, stdout and stderr are captured (and used to
 266     /// provide the resulting output).
 267     ///
 268     /// # Examples
 269     ///
 270     /// ```
 271     /// use std::process::Command;
 272     /// let output = Command::new("cat").arg("foo.txt").output().unwrap_or_else(|e| {
 273     ///     panic!("failed to execute process: {}", e)
 274     /// });
 275     ///
 276     /// println!("status: {}", output.status);
 277     /// println!("stdout: {}", String::from_utf8_lossy(&output.stdout));
 278     /// println!("stderr: {}", String::from_utf8_lossy(&output.stderr));
 279     /// ```
 280     #[stable(feature = "process", since = "1.0.0")]
 281     pub fn output(&mut self) -> io::Result<Output> {
 282         self.spawn_inner(StdioImp::Piped).and_then(|p| p.wait_with_output())
 283     }
 284
 285     /// Executes a command as a child process, waiting for it to finish and
 286     /// collecting its exit status.
 287     ///
 288     /// By default, stdin, stdout and stderr are inherited by the parent.
 289     ///
 290     /// # Examples
 291     ///
 292     /// ```
 293     /// use std::process::Command;
 294     ///
 295     /// let status = Command::new("ls").status().unwrap_or_else(|e| {
 296     ///     panic!("failed to execute process: {}", e)
 297     /// });
 298     ///
 299     /// println!("process exited with: {}", status);
 300     /// ```
 301     #[stable(feature = "process", since = "1.0.0")]
 302     pub fn status(&mut self) -> io::Result<ExitStatus> {
 303         self.spawn().and_then(|mut p| p.wait())
 304     }
 305 }
 306
 307 #[stable(feature = "rust1", since = "1.0.0")]
 308 impl fmt::Debug for Command {
 309     /// Format the program and arguments of a Command for display. Any
 310     /// non-utf8 data is lossily converted using the utf8 replacement
 311     /// character.
 312     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 313         try!(write!(f, "{:?}", self.inner.program));
 314         for arg in &self.inner.args {
 315             try!(write!(f, " {:?}", arg));
 316         }
 317         Ok(())
 318     }
 319 }
 320
 321 impl AsInner<CommandImp> for Command {
 322     fn as_inner(&self) -> &CommandImp { &self.inner }
 323 }
 324
 325 impl AsInnerMut<CommandImp> for Command {
 326     fn as_inner_mut(&mut self) -> &mut CommandImp { &mut self.inner }
 327 }
 328
 329 fn setup_io(io: &StdioImp, readable: bool)
 330             -> io::Result<(StdioImp2, Option<AnonPipe>)>
 331 {
 332     use self::StdioImp::*;
 333     Ok(match *io {
 334         Null => (StdioImp2::None, None),
 335         Inherit => (StdioImp2::Inherit, None),
 336         Piped => {
 337             let (reader, writer) = try!(pipe::anon_pipe());
 338             if readable {
 339                 (StdioImp2::Piped(reader), Some(writer))
 340             } else {
 341                 (StdioImp2::Piped(writer), Some(reader))
 342             }
 343         }
 344     })
 345 }
 346
 347 /// The output of a finished process.
 348 #[derive(PartialEq, Eq, Clone)]
 349 #[stable(feature = "process", since = "1.0.0")]
 350 pub struct Output {
 351     /// The status (exit code) of the process.
 352     #[stable(feature = "process", since = "1.0.0")]
 353     pub status: ExitStatus,
 354     /// The data that the process wrote to stdout.
 355     #[stable(feature = "process", since = "1.0.0")]
 356     pub stdout: Vec<u8>,
 357     /// The data that the process wrote to stderr.
 358     #[stable(feature = "process", since = "1.0.0")]
 359     pub stderr: Vec<u8>,
 360 }
 361
 362 /// Describes what to do with a standard I/O stream for a child process.
 363 #[stable(feature = "process", since = "1.0.0")]
 364 pub struct Stdio(StdioImp);
 365
 366 // The internal enum for stdio setup; see below for descriptions.
 367 #[derive(Clone)]
 368 enum StdioImp {
 369     Piped,
 370     Inherit,
 371     Null,
 372 }
 373
 374 impl Stdio {
 375     /// A new pipe should be arranged to connect the parent and child processes.
 376     #[stable(feature = "process", since = "1.0.0")]
 377     pub fn piped() -> Stdio { Stdio(StdioImp::Piped) }
 378
 379     /// The child inherits from the corresponding parent descriptor.
 380     #[stable(feature = "process", since = "1.0.0")]
 381     pub fn inherit() -> Stdio { Stdio(StdioImp::Inherit) }
 382
 383     /// This stream will be ignored. This is the equivalent of attaching the
 384     /// stream to `/dev/null`
 385     #[stable(feature = "process", since = "1.0.0")]
 386     pub fn null() -> Stdio { Stdio(StdioImp::Null) }
 387 }
 388
 389 /// Describes the result of a process after it has terminated.
 390 #[derive(PartialEq, Eq, Clone, Copy, Debug)]
 391 #[stable(feature = "process", since = "1.0.0")]
 392 pub struct ExitStatus(ExitStatusImp);
 393
 394 impl ExitStatus {
 395     /// Was termination successful? Signal termination not considered a success,
 396     /// and success is defined as a zero exit status.
 397     #[stable(feature = "process", since = "1.0.0")]
 398     pub fn success(&self) -> bool {
 399         self.0.success()
 400     }
 401
 402     /// Returns the exit code of the process, if any.
 403     ///
 404     /// On Unix, this will return `None` if the process was terminated
 405     /// by a signal; `std::os::unix` provides an extension trait for
 406     /// extracting the signal and other details from the `ExitStatus`.
 407     #[stable(feature = "process", since = "1.0.0")]
 408     pub fn code(&self) -> Option<i32> {
 409         self.0.code()
 410     }
 411 }
 412
 413 impl AsInner<ExitStatusImp> for ExitStatus {
 414     fn as_inner(&self) -> &ExitStatusImp { &self.0 }
 415 }
 416
 417 #[stable(feature = "process", since = "1.0.0")]
 418 impl fmt::Display for ExitStatus {
 419     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 420         self.0.fmt(f)
 421     }
 422 }
 423
 424 impl Child {
 425     /// Forces the child to exit. This is equivalent to sending a
 426     /// SIGKILL on unix platforms.
 427     #[stable(feature = "process", since = "1.0.0")]
 428     pub fn kill(&mut self) -> io::Result<()> {
 429         #[cfg(unix)] fn collect_status(p: &mut Child) {
 430             // On Linux (and possibly other unices), a process that has exited will
 431             // continue to accept signals because it is "defunct". The delivery of
 432             // signals will only fail once the child has been reaped. For this
 433             // reason, if the process hasn't exited yet, then we attempt to collect
 434             // their status with WNOHANG.
 435             if p.status.is_none() {
 436                 match p.handle.try_wait() {
 437                     Some(status) => { p.status = Some(status); }
 438                     None => {}
 439                 }
 440             }
 441         }
 442         #[cfg(windows)] fn collect_status(_p: &mut Child) {}
 443
 444         collect_status(self);
 445
 446         // if the process has finished, and therefore had waitpid called,
 447         // and we kill it, then on unix we might ending up killing a
 448         // newer process that happens to have the same (re-used) id
 449         if self.status.is_some() {
 450             return Err(Error::new(
 451                 ErrorKind::InvalidInput,
 452                 "invalid argument: can't kill an exited process",
 453             ))
 454         }
 455
 456         unsafe { self.handle.kill() }
 457     }
 458
 459     /// Waits for the child to exit completely, returning the status that it
 460     /// exited with. This function will continue to have the same return value
 461     /// after it has been called at least once.
 462     ///
 463     /// The stdin handle to the child process, if any, will be closed
 464     /// before waiting. This helps avoid deadlock: it ensures that the
 465     /// child does not block waiting for input from the parent, while
 466     /// the parent waits for the child to exit.
 467     #[stable(feature = "process", since = "1.0.0")]
 468     pub fn wait(&mut self) -> io::Result<ExitStatus> {
 469         drop(self.stdin.take());
 470         match self.status {
 471             Some(code) => Ok(ExitStatus(code)),
 472             None => {
 473                 let status = try!(self.handle.wait());
 474                 self.status = Some(status);
 475                 Ok(ExitStatus(status))
 476             }
 477         }
 478     }
 479
 480     /// Simultaneously waits for the child to exit and collect all remaining
 481     /// output on the stdout/stderr handles, returning a `Output`
 482     /// instance.
 483     ///
 484     /// The stdin handle to the child process, if any, will be closed
 485     /// before waiting. This helps avoid deadlock: it ensures that the
 486     /// child does not block waiting for input from the parent, while
 487     /// the parent waits for the child to exit.
 488     #[stable(feature = "process", since = "1.0.0")]
 489     pub fn wait_with_output(mut self) -> io::Result<Output> {
 490         drop(self.stdin.take());
 491         fn read<T: Read + Send + 'static>(stream: Option<T>) -> Receiver<io::Result<Vec<u8>>> {
 492             let (tx, rx) = channel();
 493             match stream {
 494                 Some(stream) => {
 495                     thread::spawn(move || {
 496                         let mut stream = stream;
 497                         let mut ret = Vec::new();
 498                         let res = stream.read_to_end(&mut ret);
 499                         tx.send(res.map(|_| ret)).unwrap();
 500                     });
 501                 }
 502                 None => tx.send(Ok(Vec::new())).unwrap()
 503             }
 504             rx
 505         }
 506         let stdout = read(self.stdout.take());
 507         let stderr = read(self.stderr.take());
 508         let status = try!(self.wait());
 509
 510         Ok(Output {
 511             status: status,
 512             stdout: stdout.recv().unwrap().unwrap_or(Vec::new()),
 513             stderr:  stderr.recv().unwrap().unwrap_or(Vec::new()),
 514         })
 515     }
 516 }
 517
 518 /// Terminates the current process with the specified exit code.
 519 ///
 520 /// This function will never return and will immediately terminate the current
 521 /// process. The exit code is passed through to the underlying OS and will be
 522 /// available for consumption by another process.
 523 ///
 524 /// Note that because this function never returns, and that it terminates the
 525 /// process, no destructors on the current stack or any other thread's stack
 526 /// will be run. If a clean shutdown is needed it is recommended to only call
 527 /// this function at a known point where there are no more destructors left
 528 /// to run.
 529 #[stable(feature = "rust1", since = "1.0.0")]
 530 pub fn exit(code: i32) -> ! {
 531     ::sys::os::exit(code)
 532 }
 533
 534 #[cfg(test)]
 535 mod tests {
 536     use prelude::v1::*;
 537     use io::prelude::*;
 538
 539     use io::ErrorKind;
 540     use rt::running_on_valgrind;
 541     use str;
 542     use super::{Command, Output, Stdio};
 543
 544     // FIXME(#10380) these tests should not all be ignored on android.
 545
 546     #[cfg(not(target_os="android"))]
 547     #[test]
 548     fn smoke() {
 549         let p = Command::new("true").spawn();
 550         assert!(p.is_ok());
 551         let mut p = p.unwrap();
 552         assert!(p.wait().unwrap().success());
 553     }
 554
 555     #[cfg(not(target_os="android"))]
 556     #[test]
 557     fn smoke_failure() {
 558         match Command::new("if-this-is-a-binary-then-the-world-has-ended").spawn() {
 559             Ok(..) => panic!(),
 560             Err(..) => {}
 561         }
 562     }
 563
 564     #[cfg(not(target_os="android"))]
 565     #[test]
 566     fn exit_reported_right() {
 567         let p = Command::new("false").spawn();
 568         assert!(p.is_ok());
 569         let mut p = p.unwrap();
 570         assert!(p.wait().unwrap().code() == Some(1));
 571         drop(p.wait());
 572     }
 573
 574     #[cfg(all(unix, not(target_os="android")))]
 575     #[test]
 576     fn signal_reported_right() {
 577         use os::unix::process::ExitStatusExt;
 578
 579         let p = Command::new("/bin/sh").arg("-c").arg("kill -9 $$").spawn();
 580         assert!(p.is_ok());
 581         let mut p = p.unwrap();
 582         match p.wait().unwrap().signal() {
 583             Some(9) => {},
 584             result => panic!("not terminated by signal 9 (instead, {:?})", result),
 585         }
 586     }
 587
 588     pub fn run_output(mut cmd: Command) -> String {
 589         let p = cmd.spawn();
 590         assert!(p.is_ok());
 591         let mut p = p.unwrap();
 592         assert!(p.stdout.is_some());
 593         let mut ret = String::new();
 594         p.stdout.as_mut().unwrap().read_to_string(&mut ret).unwrap();
 595         assert!(p.wait().unwrap().success());
 596         return ret;
 597     }
 598
 599     #[cfg(not(target_os="android"))]
 600     #[test]
 601     fn stdout_works() {
 602         let mut cmd = Command::new("echo");
 603         cmd.arg("foobar").stdout(Stdio::piped());
 604         assert_eq!(run_output(cmd), "foobar\n");
 605     }
 606
 607     #[cfg(all(unix, not(target_os="android")))]
 608     #[test]
 609     fn set_current_dir_works() {
 610         let mut cmd = Command::new("/bin/sh");
 611         cmd.arg("-c").arg("pwd")
 612            .current_dir("/")
 613            .stdout(Stdio::piped());
 614         assert_eq!(run_output(cmd), "/\n");
 615     }
 616
 617     #[cfg(all(unix, not(target_os="android")))]
 618     #[test]
 619     fn stdin_works() {
 620         let mut p = Command::new("/bin/sh")
 621                             .arg("-c").arg("read line; echo $line")
 622                             .stdin(Stdio::piped())
 623                             .stdout(Stdio::piped())
 624                             .spawn().unwrap();
 625         p.stdin.as_mut().unwrap().write("foobar".as_bytes()).unwrap();
 626         drop(p.stdin.take());
 627         let mut out = String::new();
 628         p.stdout.as_mut().unwrap().read_to_string(&mut out).unwrap();
 629         assert!(p.wait().unwrap().success());
 630         assert_eq!(out, "foobar\n");
 631     }
 632
 633
 634     #[cfg(all(unix, not(target_os="android")))]
 635     #[test]
 636     fn uid_works() {
 637         use os::unix::prelude::*;
 638         use libc;
 639         let mut p = Command::new("/bin/sh")
 640                             .arg("-c").arg("true")
 641                             .uid(unsafe { libc::getuid() })
 642                             .gid(unsafe { libc::getgid() })
 643                             .spawn().unwrap();
 644         assert!(p.wait().unwrap().success());
 645     }
 646
 647     #[cfg(all(unix, not(target_os="android")))]
 648     #[test]
 649     fn uid_to_root_fails() {
 650         use os::unix::prelude::*;
 651         use libc;
 652
 653         // if we're already root, this isn't a valid test. Most of the bots run
 654         // as non-root though (android is an exception).
 655         if unsafe { libc::getuid() == 0 } { return }
 656         assert!(Command::new("/bin/ls").uid(0).gid(0).spawn().is_err());
 657     }
 658
 659     #[cfg(not(target_os="android"))]
 660     #[test]
 661     fn test_process_status() {
 662         let mut status = Command::new("false").status().unwrap();
 663         assert!(status.code() == Some(1));
 664
 665         status = Command::new("true").status().unwrap();
 666         assert!(status.success());
 667     }
 668
 669     #[test]
 670     fn test_process_output_fail_to_start() {
 671         match Command::new("/no-binary-by-this-name-should-exist").output() {
 672             Err(e) => assert_eq!(e.kind(), ErrorKind::NotFound),
 673             Ok(..) => panic!()
 674         }
 675     }
 676
 677     #[cfg(not(target_os="android"))]
 678     #[test]
 679     fn test_process_output_output() {
 680         let Output {status, stdout, stderr}
 681              = Command::new("echo").arg("hello").output().unwrap();
 682         let output_str = str::from_utf8(&stdout).unwrap();
 683
 684         assert!(status.success());
 685         assert_eq!(output_str.trim().to_string(), "hello");
 686         // FIXME #7224
 687         if !running_on_valgrind() {
 688             assert_eq!(stderr, Vec::new());
 689         }
 690     }
 691
 692     #[cfg(not(target_os="android"))]
 693     #[test]
 694     fn test_process_output_error() {
 695         let Output {status, stdout, stderr}
 696              = Command::new("mkdir").arg(".").output().unwrap();
 697
 698         assert!(status.code() == Some(1));
 699         assert_eq!(stdout, Vec::new());
 700         assert!(!stderr.is_empty());
 701     }
 702
 703     #[cfg(not(target_os="android"))]
 704     #[test]
 705     fn test_finish_once() {
 706         let mut prog = Command::new("false").spawn().unwrap();
 707         assert!(prog.wait().unwrap().code() == Some(1));
 708     }
 709
 710     #[cfg(not(target_os="android"))]
 711     #[test]
 712     fn test_finish_twice() {
 713         let mut prog = Command::new("false").spawn().unwrap();
 714         assert!(prog.wait().unwrap().code() == Some(1));
 715         assert!(prog.wait().unwrap().code() == Some(1));
 716     }
 717
 718     #[cfg(not(target_os="android"))]
 719     #[test]
 720     fn test_wait_with_output_once() {
 721         let prog = Command::new("echo").arg("hello").stdout(Stdio::piped())
 722             .spawn().unwrap();
 723         let Output {status, stdout, stderr} = prog.wait_with_output().unwrap();
 724         let output_str = str::from_utf8(&stdout).unwrap();
 725
 726         assert!(status.success());
 727         assert_eq!(output_str.trim().to_string(), "hello");
 728         // FIXME #7224
 729         if !running_on_valgrind() {
 730             assert_eq!(stderr, Vec::new());
 731         }
 732     }
 733
 734     #[cfg(all(unix, not(target_os="android")))]
 735     pub fn pwd_cmd() -> Command {
 736         Command::new("pwd")
 737     }
 738     #[cfg(target_os="android")]
 739     pub fn pwd_cmd() -> Command {
 740         let mut cmd = Command::new("/system/bin/sh");
 741         cmd.arg("-c").arg("pwd");
 742         cmd
 743     }
 744
 745     #[cfg(windows)]
 746     pub fn pwd_cmd() -> Command {
 747         let mut cmd = Command::new("cmd");
 748         cmd.arg("/c").arg("cd");
 749         cmd
 750     }
 751
 752     #[cfg(all(unix, not(target_os="android")))]
 753     pub fn env_cmd() -> Command {
 754         Command::new("env")
 755     }
 756     #[cfg(target_os="android")]
 757     pub fn env_cmd() -> Command {
 758         let mut cmd = Command::new("/system/bin/sh");
 759         cmd.arg("-c").arg("set");
 760         cmd
 761     }
 762
 763     #[cfg(windows)]
 764     pub fn env_cmd() -> Command {
 765         let mut cmd = Command::new("cmd");
 766         cmd.arg("/c").arg("set");
 767         cmd
 768     }
 769
 770     #[cfg(not(target_os="android"))]
 771     #[test]
 772     fn test_inherit_env() {
 773         use std::env;
 774         if running_on_valgrind() { return; }
 775
 776         let result = env_cmd().output().unwrap();
 777         let output = String::from_utf8(result.stdout).unwrap();
 778
 779         for (ref k, ref v) in env::vars() {
 780             // don't check windows magical empty-named variables
 781             assert!(k.is_empty() ||
 782                     output.contains(&format!("{}={}", *k, *v)),
 783                     "output doesn't contain `{}={}`\n{}",
 784                     k, v, output);
 785         }
 786     }
 787     #[cfg(target_os="android")]
 788     #[test]
 789     fn test_inherit_env() {
 790         use std::env;
 791         if running_on_valgrind() { return; }
 792
 793         let mut result = env_cmd().output().unwrap();
 794         let output = String::from_utf8(result.stdout).unwrap();
 795
 796         for (ref k, ref v) in env::vars() {
 797             // don't check android RANDOM variables
 798             if *k != "RANDOM".to_string() {
 799                 assert!(output.contains(&format!("{}={}",
 800                                                  *k,
 801                                                  *v)) ||
 802                         output.contains(&format!("{}=\'{}\'",
 803                                                  *k,
 804                                                  *v)));
 805             }
 806         }
 807     }
 808
 809     #[test]
 810     fn test_override_env() {
 811         use env;
 812
 813         // In some build environments (such as chrooted Nix builds), `env` can
 814         // only be found in the explicitly-provided PATH env variable, not in
 815         // default places such as /bin or /usr/bin. So we need to pass through
 816         // PATH to our sub-process.
 817         let mut cmd = env_cmd();
 818         cmd.env_clear().env("RUN_TEST_NEW_ENV", "123");
 819         if let Some(p) = env::var_os("PATH") {
 820             cmd.env("PATH", &p);
 821         }
 822         let result = cmd.output().unwrap();
 823         let output = String::from_utf8_lossy(&result.stdout).to_string();
 824
 825         assert!(output.contains("RUN_TEST_NEW_ENV=123"),
 826                 "didn't find RUN_TEST_NEW_ENV inside of:\n\n{}", output);
 827     }
 828
 829     #[test]
 830     fn test_add_to_env() {
 831         let result = env_cmd().env("RUN_TEST_NEW_ENV", "123").output().unwrap();
 832         let output = String::from_utf8_lossy(&result.stdout).to_string();
 833
 834         assert!(output.contains("RUN_TEST_NEW_ENV=123"),
 835                 "didn't find RUN_TEST_NEW_ENV inside of:\n\n{}", output);
 836     }
 837 }