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main.cpp
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main.cpp
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/*
* Copyright (c) 2018-2020, Andreas Kling <[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "GlobalState.h"
#include "Parser.h"
#include <AK/FileSystemPath.h>
#include <AK/Function.h>
#include <AK/ScopeGuard.h>
#include <AK/StringBuilder.h>
#include <LibCore/DirIterator.h>
#include <LibCore/ElapsedTimer.h>
#include <LibCore/File.h>
#include <LibLine/Editor.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include <sys/wait.h>
#include <termios.h>
#include <unistd.h>
//#define SH_DEBUG
GlobalState g;
static Line::Editor editor { Line::Configuration { Line::Configuration::UnescapedSpaces } };
// FIXME: We do not expand variables inside strings
// if we want to be more sh-like, we should do that some day
static constexpr bool HighlightVariablesInsideStrings = false;
static bool s_disable_hyperlinks = false;
static void print_path(const String& path)
{
if (s_disable_hyperlinks) {
printf("%s", path.characters());
return;
}
printf("\033]8;;file:https://%s%s\033\\%s\033]8;;\033\\", g.hostname, path.characters(), path.characters());
}
struct ExitCodeOrContinuationRequest {
enum ContinuationRequest {
Nothing,
Pipe,
DoubleQuotedString,
SingleQuotedString,
};
ExitCodeOrContinuationRequest(ContinuationRequest continuation)
: continuation(continuation)
{
}
ExitCodeOrContinuationRequest(int exit)
: exit_code(exit)
{
}
bool has_value() const { return exit_code.has_value(); }
int value() const
{
ASSERT(has_value());
return exit_code.value();
}
Optional<int> exit_code;
ContinuationRequest continuation { Nothing };
};
static ExitCodeOrContinuationRequest run_command(const StringView&);
void cache_path();
static ExitCodeOrContinuationRequest::ContinuationRequest s_should_continue { ExitCodeOrContinuationRequest::Nothing };
static String prompt()
{
auto build_prompt = []() -> String {
auto* ps1 = getenv("PROMPT");
if (!ps1) {
if (g.uid == 0)
return "# ";
StringBuilder builder;
builder.appendf("\033]0;%s@%s:%s\007", g.username.characters(), g.hostname, g.cwd.characters());
builder.appendf("\033[31;1m%s\033[0m@\033[37;1m%s\033[0m:\033[32;1m%s\033[0m$> ", g.username.characters(), g.hostname, g.cwd.characters());
return builder.to_string();
}
StringBuilder builder;
for (char* ptr = ps1; *ptr; ++ptr) {
if (*ptr == '\\') {
++ptr;
if (!*ptr)
break;
switch (*ptr) {
case 'X':
builder.append("\033]0;");
break;
case 'a':
builder.append(0x07);
break;
case 'e':
builder.append(0x1b);
break;
case 'u':
builder.append(g.username);
break;
case 'h':
builder.append(g.hostname);
break;
case 'w': {
String home_path = getenv("HOME");
if (g.cwd.starts_with(home_path)) {
builder.append('~');
builder.append(g.cwd.substring_view(home_path.length(), g.cwd.length() - home_path.length()));
} else {
builder.append(g.cwd);
}
break;
}
case 'p':
builder.append(g.uid == 0 ? '#' : '$');
break;
}
continue;
}
builder.append(*ptr);
}
return builder.to_string();
};
auto the_prompt = build_prompt();
auto prompt_length = editor.actual_rendered_string_length(the_prompt);
if (s_should_continue != ExitCodeOrContinuationRequest::Nothing) {
const auto format_string = "\033[34m%.*-s\033[m";
switch (s_should_continue) {
case ExitCodeOrContinuationRequest::Pipe:
return String::format(format_string, prompt_length, "pipe> ");
case ExitCodeOrContinuationRequest::DoubleQuotedString:
return String::format(format_string, prompt_length, "dquote> ");
case ExitCodeOrContinuationRequest::SingleQuotedString:
return String::format(format_string, prompt_length, "squote> ");
default:
break;
}
}
return the_prompt;
}
static int sh_pwd(int, const char**)
{
print_path(g.cwd);
fputc('\n', stdout);
return 0;
}
static int sh_exit(int, const char**)
{
printf("Good-bye!\n");
exit(0);
return 0;
}
static int sh_export(int argc, const char** argv)
{
if (argc == 1) {
for (int i = 0; environ[i]; ++i)
puts(environ[i]);
return 0;
}
auto parts = String(argv[1]).split('=');
if (parts.size() != 2) {
fprintf(stderr, "usage: export variable=value\n");
return 1;
}
int setenv_return = setenv(parts[0].characters(), parts[1].characters(), 1);
if (setenv_return == 0 && parts[0] == "PATH")
cache_path();
return setenv_return;
}
static int sh_unset(int argc, const char** argv)
{
if (argc != 2) {
fprintf(stderr, "usage: unset variable\n");
return 1;
}
unsetenv(argv[1]);
return 0;
}
static String expand_tilde(const String& expression)
{
ASSERT(expression.starts_with('~'));
StringBuilder login_name;
size_t first_slash_index = expression.length();
for (size_t i = 1; i < expression.length(); ++i) {
if (expression[i] == '/') {
first_slash_index = i;
break;
}
login_name.append(expression[i]);
}
StringBuilder path;
for (size_t i = first_slash_index; i < expression.length(); ++i)
path.append(expression[i]);
if (login_name.is_empty()) {
const char* home = getenv("HOME");
if (!home) {
auto passwd = getpwuid(getuid());
ASSERT(passwd && passwd->pw_dir);
return String::format("%s/%s", passwd->pw_dir, path.to_string().characters());
}
return String::format("%s/%s", home, path.to_string().characters());
}
auto passwd = getpwnam(login_name.to_string().characters());
if (!passwd)
return expression;
ASSERT(passwd->pw_dir);
return String::format("%s/%s", passwd->pw_dir, path.to_string().characters());
}
static int sh_cd(int argc, const char** argv)
{
if (argc > 2) {
fprintf(stderr, "cd: too many arguments\n");
return 1;
}
String new_path;
if (argc == 1) {
new_path = g.home;
if (g.cd_history.is_empty() || g.cd_history.last() != g.home)
g.cd_history.enqueue(g.home);
} else {
if (g.cd_history.is_empty() || g.cd_history.last() != argv[1])
g.cd_history.enqueue(argv[1]);
if (strcmp(argv[1], "-") == 0) {
char* oldpwd = getenv("OLDPWD");
if (oldpwd == nullptr)
return 1;
new_path = oldpwd;
} else if (argv[1][0] == '/') {
new_path = argv[1];
} else {
StringBuilder builder;
builder.append(g.cwd);
builder.append('/');
builder.append(argv[1]);
new_path = builder.to_string();
}
}
FileSystemPath canonical_path(new_path);
if (!canonical_path.is_valid()) {
printf("FileSystemPath failed to canonicalize '%s'\n", new_path.characters());
return 1;
}
const char* path = canonical_path.string().characters();
struct stat st;
int rc = stat(path, &st);
if (rc < 0) {
printf("stat(%s) failed: %s\n", path, strerror(errno));
return 1;
}
if (!S_ISDIR(st.st_mode)) {
printf("Not a directory: %s\n", path);
return 1;
}
rc = chdir(path);
if (rc < 0) {
printf("chdir(%s) failed: %s\n", path, strerror(errno));
return 1;
}
setenv("OLDPWD", g.cwd.characters(), 1);
g.cwd = canonical_path.string();
setenv("PWD", g.cwd.characters(), 1);
return 0;
}
static int sh_cdh(int argc, const char** argv)
{
if (argc > 2) {
fprintf(stderr, "usage: cdh [index]\n");
return 1;
}
if (argc == 1) {
if (g.cd_history.size() == 0) {
printf("cdh: no history available\n");
return 0;
}
for (int i = g.cd_history.size() - 1; i >= 0; --i)
printf("%lu: %s\n", g.cd_history.size() - i, g.cd_history.at(i).characters());
return 0;
}
bool ok;
size_t cd_history_index = String(argv[1]).to_uint(ok);
if (!ok || cd_history_index < 1 || cd_history_index > g.cd_history.size()) {
fprintf(stderr, "usage: cdh [index]\n");
return 1;
}
const char* path = g.cd_history.at(g.cd_history.size() - cd_history_index).characters();
const char* cd_args[] = { "cd", path };
return sh_cd(2, cd_args);
}
static int sh_history(int, const char**)
{
for (size_t i = 0; i < editor.history().size(); ++i) {
printf("%6zu %s\n", i, editor.history()[i].characters());
}
return 0;
}
static int sh_time(int argc, const char** argv)
{
if (argc == 1) {
printf("usage: time <command>\n");
return 0;
}
StringBuilder builder;
for (int i = 1; i < argc; ++i) {
builder.append(argv[i]);
if (i != argc - 1)
builder.append(' ');
}
Core::ElapsedTimer timer;
timer.start();
auto exit_code = run_command(builder.string_view());
if (!exit_code.has_value()) {
printf("Shell: Incomplete command: %s\n", builder.to_string().characters());
exit_code = 1;
}
printf("Time: %d ms\n", timer.elapsed());
return exit_code.value();
}
static int sh_umask(int argc, const char** argv)
{
if (argc == 1) {
mode_t old_mask = umask(0);
printf("%#o\n", old_mask);
umask(old_mask);
return 0;
}
if (argc == 2) {
unsigned mask;
int matches = sscanf(argv[1], "%o", &mask);
if (matches == 1) {
umask(mask);
return 0;
}
}
printf("usage: umask <octal-mask>\n");
return 0;
}
static int sh_popd(int argc, const char** argv)
{
if (g.directory_stack.size() <= 1) {
fprintf(stderr, "Shell: popd: directory stack empty\n");
return 1;
}
bool should_switch = true;
String path = g.directory_stack.take_last();
// When no arguments are given, popd removes the top directory from the stack and performs a cd to the new top directory.
if (argc == 1) {
int rc = chdir(path.characters());
if (rc < 0) {
fprintf(stderr, "chdir(%s) failed: %s", path.characters(), strerror(errno));
return 1;
}
g.cwd = path;
return 0;
}
for (int i = 1; i < argc; i++) {
const char* arg = argv[i];
if (!strcmp(arg, "-n")) {
should_switch = false;
}
}
FileSystemPath canonical_path(path.characters());
if (!canonical_path.is_valid()) {
fprintf(stderr, "FileSystemPath failed to canonicalize '%s'\n", path.characters());
return 1;
}
const char* real_path = canonical_path.string().characters();
struct stat st;
int rc = stat(real_path, &st);
if (rc < 0) {
fprintf(stderr, "stat(%s) failed: %s\n", real_path, strerror(errno));
return 1;
}
if (!S_ISDIR(st.st_mode)) {
fprintf(stderr, "Not a directory: %s\n", real_path);
return 1;
}
if (should_switch) {
int rc = chdir(real_path);
if (rc < 0) {
fprintf(stderr, "chdir(%s) failed: %s\n", real_path, strerror(errno));
return 1;
}
g.cwd = canonical_path.string();
}
return 0;
}
static int sh_pushd(int argc, const char** argv)
{
StringBuilder path_builder;
bool should_switch = true;
// From the BASH reference manual: https://www.gnu.org/software/bash/manual/html_node/Directory-Stack-Builtins.html
// With no arguments, pushd exchanges the top two directories and makes the new top the current directory.
if (argc == 1) {
if (g.directory_stack.size() < 2) {
fprintf(stderr, "pushd: no other directory\n");
return 1;
}
String dir1 = g.directory_stack.take_first();
String dir2 = g.directory_stack.take_first();
g.directory_stack.insert(0, dir2);
g.directory_stack.insert(1, dir1);
int rc = chdir(dir2.characters());
if (rc < 0) {
fprintf(stderr, "chdir(%s) failed: %s", dir2.characters(), strerror(errno));
return 1;
}
g.cwd = dir2;
return 0;
}
// Let's assume the user's typed in 'pushd <dir>'
if (argc == 2) {
g.directory_stack.append(g.cwd.characters());
if (argv[1][0] == '/') {
path_builder.append(argv[1]);
} else {
path_builder.appendf("%s/%s", g.cwd.characters(), argv[1]);
}
} else if (argc == 3) {
g.directory_stack.append(g.cwd.characters());
for (int i = 1; i < argc; i++) {
const char* arg = argv[i];
if (arg[0] != '-') {
if (arg[0] == '/') {
path_builder.append(arg);
} else
path_builder.appendf("%s/%s", g.cwd.characters(), arg);
}
if (!strcmp(arg, "-n"))
should_switch = false;
}
}
FileSystemPath canonical_path(path_builder.to_string());
if (!canonical_path.is_valid()) {
fprintf(stderr, "FileSystemPath failed to canonicalize '%s'\n", path_builder.to_string().characters());
return 1;
}
const char* real_path = canonical_path.string().characters();
struct stat st;
int rc = stat(real_path, &st);
if (rc < 0) {
fprintf(stderr, "stat(%s) failed: %s\n", real_path, strerror(errno));
return 1;
}
if (!S_ISDIR(st.st_mode)) {
fprintf(stderr, "Not a directory: %s\n", real_path);
return 1;
}
if (should_switch) {
int rc = chdir(real_path);
if (rc < 0) {
fprintf(stderr, "chdir(%s) failed: %s\n", real_path, strerror(errno));
return 1;
}
g.cwd = canonical_path.string();
}
return 0;
}
static int sh_dirs(int argc, const char** argv)
{
// The first directory in the stack is ALWAYS the current directory
g.directory_stack.at(0) = g.cwd.characters();
if (argc == 1) {
for (auto& directory : g.directory_stack) {
print_path(directory);
fputc(' ', stdout);
}
printf("\n");
return 0;
}
bool printed = false;
for (int i = 0; i < argc; i++) {
const char* arg = argv[i];
if (!strcmp(arg, "-c")) {
for (size_t i = 1; i < g.directory_stack.size(); i++)
g.directory_stack.remove(i);
printed = true;
continue;
}
if (!strcmp(arg, "-p") && !printed) {
for (auto& directory : g.directory_stack) {
print_path(directory);
fputc('\n', stdout);
}
printed = true;
continue;
}
if (!strcmp(arg, "-v") && !printed) {
int idx = 0;
for (auto& directory : g.directory_stack) {
printf("%d ", idx++);
print_path(directory);
fputc('\n', stdout);
}
printed = true;
continue;
}
}
return 0;
}
static bool handle_builtin(int argc, const char** argv, int& retval)
{
if (argc == 0)
return false;
if (!strcmp(argv[0], "cd")) {
retval = sh_cd(argc, argv);
return true;
}
if (!strcmp(argv[0], "cdh")) {
retval = sh_cdh(argc, argv);
return true;
}
if (!strcmp(argv[0], "pwd")) {
retval = sh_pwd(argc, argv);
return true;
}
if (!strcmp(argv[0], "exit")) {
retval = sh_exit(argc, argv);
return true;
}
if (!strcmp(argv[0], "export")) {
retval = sh_export(argc, argv);
return true;
}
if (!strcmp(argv[0], "unset")) {
retval = sh_unset(argc, argv);
return true;
}
if (!strcmp(argv[0], "history")) {
retval = sh_history(argc, argv);
return true;
}
if (!strcmp(argv[0], "umask")) {
retval = sh_umask(argc, argv);
return true;
}
if (!strcmp(argv[0], "dirs")) {
retval = sh_dirs(argc, argv);
return true;
}
if (!strcmp(argv[0], "pushd")) {
retval = sh_pushd(argc, argv);
return true;
}
if (!strcmp(argv[0], "popd")) {
retval = sh_popd(argc, argv);
return true;
}
if (!strcmp(argv[0], "time")) {
retval = sh_time(argc, argv);
return true;
}
return false;
}
class FileDescriptionCollector {
public:
FileDescriptionCollector() { }
~FileDescriptionCollector() { collect(); }
void collect()
{
for (auto fd : m_fds)
close(fd);
m_fds.clear();
}
void add(int fd) { m_fds.append(fd); }
private:
Vector<int, 32> m_fds;
};
class CommandTimer {
public:
explicit CommandTimer(const String& command)
: m_command(command)
{
m_timer.start();
}
~CommandTimer()
{
dbg() << "Command \"" << m_command << "\" finished in " << m_timer.elapsed() << " ms";
}
private:
Core::ElapsedTimer m_timer;
String m_command;
};
static bool is_glob(const StringView& s)
{
for (size_t i = 0; i < s.length(); i++) {
char c = s.characters_without_null_termination()[i];
if (c == '*' || c == '?')
return true;
}
return false;
}
static Vector<StringView> split_path(const StringView& path)
{
Vector<StringView> parts;
size_t substart = 0;
for (size_t i = 0; i < path.length(); i++) {
char ch = path.characters_without_null_termination()[i];
if (ch != '/')
continue;
size_t sublen = i - substart;
if (sublen != 0)
parts.append(path.substring_view(substart, sublen));
parts.append(path.substring_view(i, 1));
substart = i + 1;
}
size_t taillen = path.length() - substart;
if (taillen != 0)
parts.append(path.substring_view(substart, taillen));
return parts;
}
static Vector<String> expand_globs(const StringView& path, const StringView& base)
{
auto parts = split_path(path);
StringBuilder builder;
builder.append(base);
Vector<String> res;
for (size_t i = 0; i < parts.size(); ++i) {
auto& part = parts[i];
if (!is_glob(part)) {
builder.append(part);
continue;
}
// Found a glob.
String new_base = builder.to_string();
StringView new_base_v = new_base;
if (new_base_v.is_empty())
new_base_v = ".";
Core::DirIterator di(new_base_v, Core::DirIterator::SkipParentAndBaseDir);
if (di.has_error()) {
return res;
}
while (di.has_next()) {
String name = di.next_path();
// Dotfiles have to be explicitly requested
if (name[0] == '.' && part[0] != '.')
continue;
if (name.matches(part, CaseSensitivity::CaseSensitive)) {
StringBuilder nested_base;
nested_base.append(new_base);
nested_base.append(name);
StringView remaining_path = path.substring_view_starting_after_substring(part);
Vector<String> nested_res = expand_globs(remaining_path, nested_base.to_string());
for (auto& s : nested_res)
res.append(s);
}
}
return res;
}
// Found no globs.
String new_path = builder.to_string();
if (access(new_path.characters(), F_OK) == 0)
res.append(new_path);
return res;
}
static Vector<String> expand_parameters(const StringView& param)
{
if (!param.starts_with('$'))
return { param };
String variable_name = String(param.substring_view(1, param.length() - 1));
if (variable_name == "?")
return { String::number(g.last_return_code) };
else if (variable_name == "$")
return { String::number(getpid()) };
char* env_value = getenv(variable_name.characters());
if (env_value == nullptr)
return { "" };
Vector<String> res;
String str_env_value = String(env_value);
const auto& split_text = str_env_value.split_view(' ');
for (auto& part : split_text)
res.append(part);
return res;
}
static Vector<String> process_arguments(const Vector<Token>& args)
{
Vector<String> argv_string;
for (auto& arg : args) {
if (arg.type == Token::Comment)
continue;
// This will return the text passed in if it wasn't a variable
// This lets us just loop over its values
auto expanded_parameters = expand_parameters(arg.text);
for (auto& exp_arg : expanded_parameters) {
if (exp_arg.starts_with('~'))
exp_arg = expand_tilde(exp_arg);
auto expanded_globs = expand_globs(exp_arg, "");
for (auto& path : expanded_globs)
argv_string.append(path);
if (expanded_globs.is_empty())
argv_string.append(exp_arg);
}
}
return argv_string;
}
static ExitCodeOrContinuationRequest::ContinuationRequest is_complete(const Vector<Command>& commands)
{
// check if the last command ends with a pipe, or an unterminated string
auto& last_command = commands.last();
auto& subcommands = last_command.subcommands;
if (subcommands.size() == 0)
return ExitCodeOrContinuationRequest::Nothing;
auto& last_subcommand = subcommands.last();
if (!last_subcommand.redirections.find([](auto& redirection) { return redirection.type == Redirection::Pipe; }).is_end())
return ExitCodeOrContinuationRequest::Pipe;
if (!last_subcommand.args.find([](auto& token) { return token.type == Token::UnterminatedSingleQuoted; }).is_end())
return ExitCodeOrContinuationRequest::SingleQuotedString;
if (!last_subcommand.args.find([](auto& token) { return token.type == Token::UnterminatedDoubleQuoted; }).is_end())
return ExitCodeOrContinuationRequest::DoubleQuotedString;
return ExitCodeOrContinuationRequest::Nothing;
}
static ExitCodeOrContinuationRequest run_command(const StringView& cmd)
{
if (cmd.is_empty())
return 0;
if (cmd.starts_with("#"))
return 0;
auto commands = Parser(cmd).parse();
auto needs_more = is_complete(commands);
if (needs_more != ExitCodeOrContinuationRequest::Nothing)
return needs_more;
#ifdef SH_DEBUG
for (auto& command : commands) {
for (size_t i = 0; i < command.subcommands.size(); ++i) {
for (size_t j = 0; j < i; ++j)
dbgprintf(" ");
for (auto& arg : command.subcommands[i].args) {
switch (arg.type) {
case Token::Bare:
dbgprintf("<%s> ", arg.text.characters());
break;
case Token::SingleQuoted:
dbgprintf("'<%s>' ", arg.text.characters());
break;
case Token::DoubleQuoted:
dbgprintf("\"<%s>\" ", arg.text.characters());
break;
case Token::UnterminatedSingleQuoted:
dbgprintf("\'<%s> ", arg.text.characters());
break;
case Token::UnterminatedDoubleQuoted:
dbgprintf("\"<%s> ", arg.text.characters());
break;
case Token::Special:
dbgprintf("<%s> ", arg.text.characters());
break;
case Token::Comment:
dbgprintf("<%s> ", arg.text.characters());
break;
}
}
dbgprintf("\n");
for (auto& redirecton : command.subcommands[i].redirections) {
for (size_t j = 0; j < i; ++j)
dbgprintf(" ");
dbgprintf(" ");
switch (redirecton.type) {
case Redirection::Pipe:
dbgprintf("Pipe\n");
break;
case Redirection::FileRead:
dbgprintf("fd:%d = FileRead: %s\n", redirecton.fd, redirecton.path.characters());
break;
case Redirection::FileWrite:
dbgprintf("fd:%d = FileWrite: %s\n", redirecton.fd, redirecton.path.characters());
break;
case Redirection::FileWriteAppend:
dbgprintf("fd:%d = FileWriteAppend: %s\n", redirecton.fd, redirecton.path.characters());
break;
default:
break;
}
}
}
dbgprintf("\n");
}
#endif
struct termios trm;
tcgetattr(0, &trm);
struct SpawnedProcess {
String name;
pid_t pid;
};
int return_value = 0;
for (auto& command : commands) {
if (command.subcommands.is_empty())
continue;
FileDescriptionCollector fds;
for (size_t i = 0; i < command.subcommands.size(); ++i) {
auto& subcommand = command.subcommands[i];
for (auto& redirection : subcommand.redirections) {
switch (redirection.type) {
case Redirection::Pipe: {
int pipefd[2];
int rc = pipe(pipefd);
if (rc < 0) {
perror("pipe");
return 1;
}
subcommand.rewirings.append({ STDOUT_FILENO, pipefd[1] });
auto& next_command = command.subcommands[i + 1];
next_command.rewirings.append({ STDIN_FILENO, pipefd[0] });
fds.add(pipefd[0]);
fds.add(pipefd[1]);
break;
}
case Redirection::FileWriteAppend: {
int fd = open(redirection.path.characters(), O_WRONLY | O_CREAT | O_APPEND, 0666);
if (fd < 0) {
perror("open");
return 1;
}
subcommand.rewirings.append({ redirection.fd, fd });
fds.add(fd);
break;
}
case Redirection::FileWrite: {
int fd = open(redirection.path.characters(), O_WRONLY | O_CREAT | O_TRUNC, 0666);
if (fd < 0) {
perror("open");
return 1;
}
subcommand.rewirings.append({ redirection.fd, fd });
fds.add(fd);
break;
}
case Redirection::FileRead: {
int fd = open(redirection.path.characters(), O_RDONLY);
if (fd < 0) {
perror("open");
return 1;
}
subcommand.rewirings.append({ redirection.fd, fd });
fds.add(fd);
break;
}
}
}
}
Vector<SpawnedProcess> children;
CommandTimer timer(cmd);
for (size_t i = 0; i < command.subcommands.size(); ++i) {
auto& subcommand = command.subcommands[i];
Vector<String> argv_string = process_arguments(subcommand.args);
Vector<const char*> argv;
argv.ensure_capacity(argv_string.size());
for (const auto& s : argv_string) {
argv.append(s.characters());
}