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-emscripten
  12
  13 use std::process::Command;
  14 use std::env;
  15 use std::collections::HashMap;
  16
  17 #[cfg(all(unix, not(target_os="android")))]
  18 pub fn env_cmd() -> Command {
  19     Command::new("env")
  20 }
  21 #[cfg(target_os="android")]
  22 pub fn env_cmd() -> Command {
  23     let mut cmd = Command::new("/system/bin/sh");
  24     cmd.arg("-c").arg("set");
  25     cmd
  26 }
  27
  28 #[cfg(windows)]
  29 pub fn env_cmd() -> Command {
  30     let mut cmd = Command::new("cmd");
  31     cmd.arg("/c").arg("set");
  32     cmd
  33 }
  34
  35 fn main() {
  36     // save original environment
  37     let old_env = env::var_os("RUN_TEST_NEW_ENV");
  38
  39     env::set_var("RUN_TEST_NEW_ENV", "123");
  40
  41     // create filtered environment vector
  42     let filtered_env : HashMap<String, String> =
  43         env::vars().filter(|&(ref k, _)| k == "PATH").collect();
  44
  45     let mut cmd = env_cmd();
  46     cmd.env_clear();
  47     cmd.envs(&filtered_env);
  48
  49     // restore original environment
  50     match old_env {
  51         None => env::remove_var("RUN_TEST_NEW_ENV"),
  52         Some(val) => env::set_var("RUN_TEST_NEW_ENV", &val)
  53     }
  54
  55     let result = cmd.output().unwrap();
  56     let output = String::from_utf8_lossy(&result.stdout);
  57
  58     assert!(!output.contains("RUN_TEST_NEW_ENV"),
  59             "found RUN_TEST_NEW_ENV inside of:\n\n{}", output);
  60 }