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/*
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/LexicalPath.h>
#include <AK/Random.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/System.h>
#include <LibMain/Main.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
constexpr StringView default_template = "tmp.XXXXXXXXXX";
static String generate_random_filename(String const& pattern)
{
StringBuilder new_filename { pattern.length() };
constexpr char random_characters[] = "abcdefghijklmnopqrstuvwxyz0123456789";
for (size_t i = 0; i < pattern.length(); i++) {
if (pattern[i] == 'X')
new_filename.append(random_characters[(get_random<u32>() % (sizeof(random_characters) - 1))]);
else
new_filename.append(pattern[i]);
}
return new_filename.to_string();
}
static ErrorOr<String> make_temp(String const& pattern, bool directory, bool dry_run)
{
for (int i = 0; i < 100; ++i) {
auto path = generate_random_filename(pattern);
if (dry_run) {
auto stat_or_error = Core::System::lstat(path.view());
if (stat_or_error.is_error() && stat_or_error.error().code() == ENOENT)
return path;
} else if (directory) {
TRY(Core::System::mkdir(path.view(), 0700));
return path;
} else {
auto fd_or_error = Core::System::open(path.view(), O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
if (!fd_or_error.is_error()) {
TRY(Core::System::close(fd_or_error.value()));
return path;
}
}
}
return String {};
}
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
TRY(Core::System::pledge("stdio rpath wpath cpath"));
StringView file_template;
bool create_directory = false;
bool dry_run = false;
bool quiet = false;
StringView target_directory;
Core::ArgsParser args_parser;
args_parser.set_general_help("Create a temporary file or directory, safely, and print its name.");
args_parser.add_positional_argument(file_template, "The template must contain at least 3 consecutive 'X's", "template", Core::ArgsParser::Required::No);
args_parser.add_option(create_directory, "Create a temporary directory instead of a file", "directory", 'd');
args_parser.add_option(dry_run, "Do not create anything, just print a unique name", "dry-run", 'u');
args_parser.add_option(quiet, "Do not print diagnostics about file/directory creation failure", "quiet", 'q');
args_parser.add_option(target_directory, "Create TEMPLATE relative to DIR", "tmpdir", 'p', "DIR");
args_parser.parse(arguments);
if (target_directory.is_empty()) {
if (!file_template.is_empty()) { // If a custom template is specified we assume the target directory is the current directory
target_directory = getcwd(nullptr, 0);
} else {
LexicalPath template_path(file_template);
char const* env_directory = getenv("TMPDIR");
target_directory = env_directory && *env_directory ? env_directory : "/tmp";
}
}
if (file_template.is_empty()) {
file_template = default_template;
}
if (!file_template.find("XXX").has_value()) {
if (!quiet)
warnln("Too few X's in template {}", file_template);
return 1;
}
auto target_path = LexicalPath::join(target_directory, file_template).string();
auto final_path = TRY(make_temp(target_path, create_directory, dry_run));
if (final_path.is_null()) {
if (!quiet) {
if (create_directory)
warnln("Failed to create directory via template {}", target_path.characters());
else
warnln("Failed to create file via template {}", target_path.characters());
}
return 1;
}
outln("{}", final_path);
return 0;
}
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