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fbdd6df185
Previously, Core::command only returned a String which contained the data from stdout. The CommandResult struct contains the exit code as well as the data from stdout and stderr.
103 lines
2.9 KiB
C++
103 lines
2.9 KiB
C++
/*
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* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "Command.h"
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#include <AK/Format.h>
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#include <AK/ScopeGuard.h>
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#include <LibCore/File.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/wait.h>
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#include <unistd.h>
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namespace Core {
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// Only supported in serenity mode because we use `posix_spawn_file_actions_addchdir`
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#ifdef __serenity__
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ErrorOr<CommandResult> command(String const& command_string, Optional<LexicalPath> chdir)
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{
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auto parts = command_string.split(' ');
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if (parts.is_empty())
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return Error::from_string_literal("empty command"sv);
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auto program = parts[0];
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parts.remove(0);
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return command(program, parts, chdir);
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}
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ErrorOr<CommandResult> command(String const& program, Vector<String> const& arguments, Optional<LexicalPath> chdir)
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{
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int stdout_pipe[2] = {};
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int stderr_pipe[2] = {};
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if (pipe2(stdout_pipe, O_CLOEXEC)) {
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return Error::from_errno(errno);
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}
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if (pipe2(stderr_pipe, O_CLOEXEC)) {
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perror("pipe2");
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return Error::from_errno(errno);
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}
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auto close_pipes = ScopeGuard([stderr_pipe, stdout_pipe] {
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// The write-ends of these pipes are closed manually
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close(stdout_pipe[0]);
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close(stderr_pipe[0]);
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});
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Vector<const char*> parts = { program.characters() };
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for (const auto& part : arguments) {
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parts.append(part.characters());
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}
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parts.append(nullptr);
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const char** argv = parts.data();
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posix_spawn_file_actions_t action;
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posix_spawn_file_actions_init(&action);
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if (chdir.has_value()) {
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posix_spawn_file_actions_addchdir(&action, chdir.value().string().characters());
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}
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posix_spawn_file_actions_adddup2(&action, stdout_pipe[1], STDOUT_FILENO);
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posix_spawn_file_actions_adddup2(&action, stderr_pipe[1], STDERR_FILENO);
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pid_t pid;
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if ((errno = posix_spawnp(&pid, program.characters(), &action, nullptr, const_cast<char**>(argv), environ))) {
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perror("posix_spawn");
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VERIFY_NOT_REACHED();
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}
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// close the write-ends so reading wouldn't block
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close(stdout_pipe[1]);
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close(stderr_pipe[1]);
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auto read_all_from_pipe = [](int pipe[2]) {
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auto result_file = Core::File::construct();
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if (!result_file->open(pipe[0], Core::OpenMode::ReadOnly, Core::File::ShouldCloseFileDescriptor::Yes)) {
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perror("open");
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VERIFY_NOT_REACHED();
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}
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return String::copy(result_file->read_all());
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};
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auto stdout = read_all_from_pipe(stdout_pipe);
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auto stderr = read_all_from_pipe(stderr_pipe);
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int wstatus { 0 };
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waitpid(pid, &wstatus, 0);
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posix_spawn_file_actions_destroy(&action);
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int exit_code = WEXITSTATUS(wstatus);
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if (exit_code != 0) {
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# ifdef DBG_FAILED_COMMANDS
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dbgln("command failed. stderr: {}", );
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# endif
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}
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return CommandResult { WEXITSTATUS(wstatus), stdout, stderr };
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}
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#endif
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}
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