tree 3de1006eb7e9f2c451373263fb39898acb738764
parent 25f6bff894a558fd6b7076a22f9e881d807304e6
author Xinhao Yuan <xinhaoyuan@google.com> 1785887080 -0700
committer Copybara-Service <copybara-worker@google.com> 1788909291 -0700

Windows support 1/x: centipede:command.

`Command` previously relied on `posix_spawn` with `/bin/sh`, the POSIX `env` utility for environment variable modifications, and shell `<` redirection syntax in arguments. These mechanisms are not portable to Windows.

Refactor `Command` to support native Windows process management alongside POSIX:

- Introduce `Command::PlatformContext` to encapsulate platform-specific process handles (`HANDLE` on Windows vs. `pid_t` and `ForkServerProps` on POSIX).

- Implement Windows process creation, environment block construction (`Options::env_diff`), and standard stream redirection in `Command::ExecuteAsync()` using `CreateProcessA`.

- Add `Options::stdin_file_path` to handle input redirection directly rather than appending `"<"` to command arguments, and update `SymbolTable` to use it.

- Escape command-line arguments, environment variables, and file paths in `Command::ToString()` on both POSIX (`ShellEscape`) and Windows.

- Update `command_test_helper` and `command_test` to verify arguments, environment variables, standard input, and signals portably without relying on `bash`, and enable `centipede:command_test` on Windows CI.

- Update `GetDataDependencyFilepath` to return executable path suffixed with `.exe` under Windows.

PiperOrigin-RevId: 959298250