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+/*
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+ * Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
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+ * All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions are met:
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+ *
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+ * 1. Redistributions of source code must retain the above copyright notice, this
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+ * list of conditions and the following disclaimer.
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+ *
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+ * 2. Redistributions in binary form must reproduce the above copyright notice,
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+ * this list of conditions and the following disclaimer in the documentation
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+ * and/or other materials provided with the distribution.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+ */
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+
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+#include "Command.h"
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+#include <AK/LogStream.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 <stdlib.h>
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+#include <sys/wait.h>
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+#include <unistd.h>
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+
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+// #define DBG_FAILED_COMMANDS
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+
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+namespace Core {
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+
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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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+
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+String command(const String& 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 {};
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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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+
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+String command(const String& program, const Vector<String>& 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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+ perror("pipe2");
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+ ASSERT_NOT_REACHED();
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+ }
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+ if (pipe2(stderr_pipe, O_CLOEXEC)) {
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+ perror("pipe2");
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+ ASSERT_NOT_REACHED();
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+ }
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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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+
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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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+
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+ const char** argv = parts.data();
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+
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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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+
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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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+ ASSERT_NOT_REACHED();
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+ }
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+ int wstatus;
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+ waitpid(pid, &wstatus, 0);
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+ posix_spawn_file_actions_destroy(&action);
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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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+
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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::IODevice::ReadOnly, Core::File::ShouldCloseFileDescription::Yes)) {
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+ perror("open");
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+ ASSERT_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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+
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+ if (WEXITSTATUS(wstatus) != 0) {
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+# ifdef DBG_FAILED_COMMANDS
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+ dbg() << "command failed. stderr: " << read_all_from_pipe(stderr_pipe);
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+# endif
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+ return {};
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+ }
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+
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+ auto result = read_all_from_pipe(stdout_pipe);
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+ if (result.is_null())
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+ return "";
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+ return result;
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+}
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+
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+#endif
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+
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+}
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Itamar