jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <AK/LexicalPath.h>
8#include <AK/Random.h>
9#include <LibCore/ArgsParser.h>
10#include <LibCore/System.h>
11#include <LibMain/Main.h>
12#include <fcntl.h>
13#include <sys/stat.h>
14#include <unistd.h>
15
16constexpr StringView default_template = "tmp.XXXXXXXXXX"sv;
17
18static DeprecatedString generate_random_filename(DeprecatedString const& pattern)
19{
20 StringBuilder new_filename { pattern.length() };
21
22 constexpr char random_characters[] = "abcdefghijklmnopqrstuvwxyz0123456789";
23 for (size_t i = 0; i < pattern.length(); i++) {
24 if (pattern[i] == 'X')
25 new_filename.append(random_characters[(get_random<u32>() % (sizeof(random_characters) - 1))]);
26 else
27 new_filename.append(pattern[i]);
28 }
29
30 return new_filename.to_deprecated_string();
31}
32
33static ErrorOr<DeprecatedString> make_temp(DeprecatedString const& pattern, bool directory, bool dry_run)
34{
35 for (int i = 0; i < 100; ++i) {
36 auto path = generate_random_filename(pattern);
37 if (dry_run) {
38 auto stat_or_error = Core::System::lstat(path.view());
39 if (stat_or_error.is_error() && stat_or_error.error().code() == ENOENT)
40 return path;
41 } else if (directory) {
42 TRY(Core::System::mkdir(path.view(), 0700));
43 return path;
44 } else {
45 auto fd_or_error = Core::System::open(path.view(), O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
46 if (!fd_or_error.is_error()) {
47 TRY(Core::System::close(fd_or_error.value()));
48 return path;
49 }
50 }
51 }
52 return DeprecatedString {};
53}
54
55ErrorOr<int> serenity_main(Main::Arguments arguments)
56{
57 TRY(Core::System::pledge("stdio rpath wpath cpath"));
58
59 StringView file_template;
60 bool create_directory = false;
61 bool dry_run = false;
62 bool quiet = false;
63 StringView target_directory;
64
65 Core::ArgsParser args_parser;
66 args_parser.set_general_help("Create a temporary file or directory, safely, and print its name.");
67 args_parser.add_positional_argument(file_template, "The template must contain at least 3 consecutive 'X's", "template", Core::ArgsParser::Required::No);
68 args_parser.add_option(create_directory, "Create a temporary directory instead of a file", "directory", 'd');
69 args_parser.add_option(dry_run, "Do not create anything, just print a unique name", "dry-run", 'u');
70 args_parser.add_option(quiet, "Do not print diagnostics about file/directory creation failure", "quiet", 'q');
71 args_parser.add_option(target_directory, "Create TEMPLATE relative to DIR", "tmpdir", 'p', "DIR");
72 args_parser.parse(arguments);
73
74 if (target_directory.is_empty()) {
75 if (!file_template.is_empty()) { // If a custom template is specified we assume the target directory is the current directory
76 // FIXME: Get rid of this minor memory leak.
77 auto const* cwd_ptr = getcwd(nullptr, 0);
78 target_directory = StringView { cwd_ptr, strlen(cwd_ptr) };
79 } else {
80 LexicalPath template_path(file_template);
81 char const* env_directory = getenv("TMPDIR");
82 target_directory = env_directory && *env_directory ? StringView { env_directory, strlen(env_directory) } : "/tmp"sv;
83 }
84 }
85
86 if (file_template.is_empty()) {
87 file_template = default_template;
88 }
89
90 if (!file_template.find("XXX"sv).has_value()) {
91 if (!quiet)
92 warnln("Too few X's in template {}", file_template);
93 return 1;
94 }
95
96 auto target_path = LexicalPath::join(target_directory, file_template).string();
97
98 auto final_path = TRY(make_temp(target_path, create_directory, dry_run));
99 if (final_path.is_null()) {
100 if (!quiet) {
101 if (create_directory)
102 warnln("Failed to create directory via template {}", target_path.characters());
103 else
104 warnln("Failed to create file via template {}", target_path.characters());
105 }
106 return 1;
107 }
108
109 outln("{}", final_path);
110
111 return 0;
112}