046062d3bf
The existing APIs for spawning processes took strings for the command and arguments, but the underlying system may not impose utf8 encoding, so this is overly limiting. The assumption we actually want to make is just that the command and arguments are viewable as [u8] slices with no interior NULLs, i.e., as CStrings. The ToCStr trait is a handy bound for types that meet this requirement (such as &str and Path). However, since the commands and arguments are often a mixture of strings and paths, it would be inconvenient to take a slice with a single T: ToCStr bound. So this patch revamps the process creation API to instead use a builder-style interface, called `Command`, allowing arguments to be added one at a time with differing ToCStr implementations for each. The initial cut of the builder API has some drawbacks that can be addressed once issue #13851 (libstd as a facade) is closed. These are detailed as FIXMEs. Closes #11650. [breaking-change]
84 lines
2.8 KiB
Rust
84 lines
2.8 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// no-prefer-dynamic
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// The test copies itself into a subdirectory with a non-ASCII name and then
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// runs it as a child process within the subdirectory. The parent process
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// also adds an environment variable and an argument, both containing
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// non-ASCII characters. The child process ensures all the strings are
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// intact.
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extern crate native;
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use std::io;
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use std::io::fs;
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use std::io::Command;
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use std::os;
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use std::path::Path;
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fn main() {
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let my_args = os::args();
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let my_cwd = os::getcwd();
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let my_env = os::env();
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let my_path = Path::new(os::self_exe_name().unwrap());
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let my_dir = my_path.dir_path();
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let my_ext = my_path.extension_str().unwrap_or("");
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// some non-ASCII characters
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let blah = "\u03c0\u042f\u97f3\u00e6\u221e";
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let child_name = "child";
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let child_dir = "process-spawn-with-unicode-params-" + blah;
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// parameters sent to child / expected to be received from parent
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let arg = blah;
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let cwd = my_dir.join(Path::new(child_dir.clone()));
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let env = ("RUST_TEST_PROC_SPAWN_UNICODE".to_owned(), blah.to_owned());
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// am I the parent or the child?
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if my_args.len() == 1 { // parent
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let child_filestem = Path::new(child_name);
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let child_filename = child_filestem.with_extension(my_ext);
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let child_path = cwd.join(child_filename.clone());
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// make a separate directory for the child
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drop(fs::mkdir(&cwd, io::UserRWX).is_ok());
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assert!(fs::copy(&my_path, &child_path).is_ok());
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// run child
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let p = Command::new(&child_path)
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.arg(arg)
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.cwd(&cwd)
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.env(my_env.append_one(env).as_slice())
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.spawn().unwrap().wait_with_output().unwrap();
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// display the output
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assert!(io::stdout().write(p.output.as_slice()).is_ok());
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assert!(io::stderr().write(p.error.as_slice()).is_ok());
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// make sure the child succeeded
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assert!(p.status.success());
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} else { // child
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// check working directory (don't try to compare with `cwd` here!)
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assert!(my_cwd.ends_with_path(&Path::new(child_dir)));
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// check arguments
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assert_eq!(my_args.get(1).as_slice(), arg);
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// check environment variable
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assert!(my_env.contains(&env));
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};
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}
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