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