
Non-interactive shells (i.e. when running scripts) do not need this functionality, so they are a boatload of wasted time. This significantly reduces the script startup and shutdown times when there are lots of executables in PATH or lots of entries in the history.
204 lines
6.9 KiB
C++
204 lines
6.9 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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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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#include "Execution.h"
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#include "Shell.h"
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#include <LibCore/ArgsParser.h>
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#include <LibCore/Event.h>
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#include <LibCore/EventLoop.h>
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#include <LibCore/File.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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RefPtr<Line::Editor> editor;
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Shell::Shell* s_shell;
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int main(int argc, char** argv)
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{
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Core::EventLoop loop;
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Core::EventLoop::register_signal(SIGINT, [](int) {
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s_shell->kill_job(s_shell->current_job(), SIGINT);
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});
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Core::EventLoop::register_signal(SIGWINCH, [](int) {
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s_shell->kill_job(s_shell->current_job(), SIGWINCH);
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});
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Core::EventLoop::register_signal(SIGTTIN, [](int) {});
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Core::EventLoop::register_signal(SIGTTOU, [](int) {});
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Core::EventLoop::register_signal(SIGHUP, [](int) {
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for (auto& it : s_shell->jobs)
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s_shell->kill_job(it.value.ptr(), SIGHUP);
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s_shell->editor()->save_history(s_shell->get_history_path());
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});
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#ifdef __serenity__
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if (pledge("stdio rpath wpath cpath proc exec tty accept sigaction unix fattr", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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#endif
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RefPtr<::Shell::Shell> shell;
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bool attempt_interactive = false;
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auto initialize = [&] {
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editor = Line::Editor::construct();
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editor->initialize();
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shell = Shell::Shell::construct(*editor, attempt_interactive);
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s_shell = shell.ptr();
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s_shell->setup_signals();
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#ifndef __serenity__
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sigset_t blocked;
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sigemptyset(&blocked);
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sigaddset(&blocked, SIGTTOU);
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sigaddset(&blocked, SIGTTIN);
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pthread_sigmask(SIG_BLOCK, &blocked, nullptr);
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#endif
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shell->termios = editor->termios();
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shell->default_termios = editor->default_termios();
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editor->on_display_refresh = [&](auto& editor) {
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editor.strip_styles();
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if (shell->should_format_live()) {
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auto line = editor.line();
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ssize_t cursor = editor.cursor();
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editor.clear_line();
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editor.insert(shell->format(line, cursor));
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if (cursor >= 0)
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editor.set_cursor(cursor);
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}
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shell->highlight(editor);
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};
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editor->on_tab_complete = [&](const Line::Editor&) {
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return shell->complete();
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};
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};
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const char* command_to_run = nullptr;
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const char* file_to_read_from = nullptr;
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Vector<const char*> script_args;
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bool skip_rc_files = false;
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const char* format = nullptr;
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bool should_format_live = false;
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Core::ArgsParser parser;
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parser.add_option(command_to_run, "String to read commands from", "command-string", 'c', "command-string");
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parser.add_option(skip_rc_files, "Skip running shellrc files", "skip-shellrc", 0);
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parser.add_option(format, "Format the given file into stdout and exit", "format", 0, "file");
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parser.add_option(should_format_live, "Enable live formatting", "live-formatting", 'f');
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parser.add_positional_argument(file_to_read_from, "File to read commands from", "file", Core::ArgsParser::Required::No);
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parser.add_positional_argument(script_args, "Extra arguments to pass to the script (via $* and co)", "argument", Core::ArgsParser::Required::No);
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parser.parse(argc, argv);
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if (format) {
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auto file = Core::File::open(format, Core::IODevice::ReadOnly);
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if (file.is_error()) {
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fprintf(stderr, "Error: %s", file.error().characters());
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return 1;
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}
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initialize();
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ssize_t cursor = -1;
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puts(shell->format(file.value()->read_all(), cursor).characters());
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return 0;
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}
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auto pid = getpid();
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if (auto sid = getsid(pid); sid == 0) {
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if (setsid() < 0) {
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perror("setsid");
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// Let's just hope that it's ok.
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}
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} else if (sid != pid) {
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if (getpgid(pid) != pid) {
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dbgln("We were already in a session with sid={} (we are {}), let's do some gymnastics", sid, pid);
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if (setpgid(pid, sid) < 0) {
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auto strerr = strerror(errno);
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dbgln("couldn't setpgid: {}", strerr);
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}
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if (setsid() < 0) {
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auto strerr = strerror(errno);
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dbgln("couldn't setsid: {}", strerr);
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}
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}
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}
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auto execute_file = file_to_read_from && StringView { "-" } != file_to_read_from;
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attempt_interactive = !execute_file;
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initialize();
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shell->set_live_formatting(should_format_live);
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shell->current_script = argv[0];
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if (!skip_rc_files) {
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auto run_rc_file = [&](auto& name) {
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String file_path = name;
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if (file_path.starts_with('~'))
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file_path = shell->expand_tilde(file_path);
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if (Core::File::exists(file_path)) {
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shell->run_file(file_path, false);
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}
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};
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run_rc_file(Shell::Shell::global_init_file_path);
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run_rc_file(Shell::Shell::local_init_file_path);
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}
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{
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Vector<String> args;
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for (auto* arg : script_args)
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args.empend(arg);
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shell->set_local_variable("ARGV", adopt(*new Shell::AST::ListValue(move(args))));
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}
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if (command_to_run) {
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dbgln("sh -c '{}'\n", command_to_run);
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return shell->run_command(command_to_run);
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}
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if (execute_file) {
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if (shell->run_file(file_to_read_from))
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return 0;
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return 1;
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}
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shell->add_child(*editor);
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Core::EventLoop::current().post_event(*shell, make<Core::CustomEvent>(Shell::Shell::ShellEventType::ReadLine));
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return loop.exec();
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}
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