src/test/run-pass/process-envs.rs

   1 // Copyright 2014, 2017 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 // ignore-cloudabi no processes
  12 // ignore-emscripten no processes
  13
  14 use std::process::Command;
  15 use std::env;
  16 use std::collections::HashMap;
  17
  18 #[cfg(all(unix, not(target_os="android")))]
  19 pub fn env_cmd() -> Command {
  20     Command::new("env")
  21 }
  22 #[cfg(target_os="android")]
  23 pub fn env_cmd() -> Command {
  24     let mut cmd = Command::new("/system/bin/sh");
  25     cmd.arg("-c").arg("set");
  26     cmd
  27 }
  28
  29 #[cfg(windows)]
  30 pub fn env_cmd() -> Command {
  31     let mut cmd = Command::new("cmd");
  32     cmd.arg("/c").arg("set");
  33     cmd
  34 }
  35
  36 fn main() {
  37     // save original environment
  38     let old_env = env::var_os("RUN_TEST_NEW_ENV");
  39
  40     env::set_var("RUN_TEST_NEW_ENV", "123");
  41
  42     // create filtered environment vector
  43     let filtered_env : HashMap<String, String> =
  44         env::vars().filter(|&(ref k, _)| k == "PATH").collect();
  45
  46     let mut cmd = env_cmd();
  47     cmd.env_clear();
  48     cmd.envs(&filtered_env);
  49
  50     // restore original environment
  51     match old_env {
  52         None => env::remove_var("RUN_TEST_NEW_ENV"),
  53         Some(val) => env::set_var("RUN_TEST_NEW_ENV", &val)
  54     }
  55
  56     let result = cmd.output().unwrap();
  57     let output = String::from_utf8_lossy(&result.stdout);
  58
  59     assert!(!output.contains("RUN_TEST_NEW_ENV"),
  60             "found RUN_TEST_NEW_ENV inside of:\n\n{}", output);
  61 }