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/*
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "Command.h"
#include <AK/Format.h>
#include <AK/ScopeGuard.h>
#include <LibCore/File.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/wait.h>
#include <unistd.h>
namespace Core {
// Only supported in serenity mode because we use `posix_spawn_file_actions_addchdir`
#ifdef __serenity__
ErrorOr<CommandResult> command(String const& command_string, Optional<LexicalPath> chdir)
{
auto parts = command_string.split(' ');
if (parts.is_empty())
return Error::from_string_literal("empty command"sv);
auto program = parts[0];
parts.remove(0);
return command(program, parts, chdir);
}
ErrorOr<CommandResult> command(String const& program, Vector<String> const& arguments, Optional<LexicalPath> chdir)
{
int stdout_pipe[2] = {};
int stderr_pipe[2] = {};
if (pipe2(stdout_pipe, O_CLOEXEC)) {
return Error::from_errno(errno);
}
if (pipe2(stderr_pipe, O_CLOEXEC)) {
perror("pipe2");
return Error::from_errno(errno);
}
auto close_pipes = ScopeGuard([stderr_pipe, stdout_pipe] {
// The write-ends of these pipes are closed manually
close(stdout_pipe[0]);
close(stderr_pipe[0]);
});
Vector<char const*> parts = { program.characters() };
for (auto const& part : arguments) {
parts.append(part.characters());
}
parts.append(nullptr);
char const** argv = parts.data();
posix_spawn_file_actions_t action;
posix_spawn_file_actions_init(&action);
if (chdir.has_value()) {
posix_spawn_file_actions_addchdir(&action, chdir.value().string().characters());
}
posix_spawn_file_actions_adddup2(&action, stdout_pipe[1], STDOUT_FILENO);
posix_spawn_file_actions_adddup2(&action, stderr_pipe[1], STDERR_FILENO);
pid_t pid;
if ((errno = posix_spawnp(&pid, program.characters(), &action, nullptr, const_cast<char**>(argv), environ))) {
perror("posix_spawn");
VERIFY_NOT_REACHED();
}
// close the write-ends so reading wouldn't block
close(stdout_pipe[1]);
close(stderr_pipe[1]);
auto read_all_from_pipe = [](int pipe[2]) {
auto result_file = Core::File::construct();
if (!result_file->open(pipe[0], Core::OpenMode::ReadOnly, Core::File::ShouldCloseFileDescriptor::Yes)) {
perror("open");
VERIFY_NOT_REACHED();
}
return String::copy(result_file->read_all());
};
auto output = read_all_from_pipe(stdout_pipe);
auto error = read_all_from_pipe(stderr_pipe);
int wstatus { 0 };
waitpid(pid, &wstatus, 0);
posix_spawn_file_actions_destroy(&action);
int exit_code = WEXITSTATUS(wstatus);
if (exit_code != 0) {
# ifdef DBG_FAILED_COMMANDS
dbgln("command failed. stderr: {}", );
# endif
}
return CommandResult { WEXITSTATUS(wstatus), output, error };
}
#endif
}
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