mirror of
https://github.com/SerenityOS/serenity
synced 2024-07-22 02:26:11 +00:00
16fcbe555e
Previously, touch would exit immediately if there was an error changing file permissions. We now print an error to stderr and continue when an error occurs.
267 lines
10 KiB
C++
267 lines
10 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022, Ariel Don <ariel@arieldon.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/CharacterTypes.h>
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#include <AK/CheckedFormatString.h>
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#include <AK/GenericLexer.h>
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#include <AK/Time.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/System.h>
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#include <LibFileSystem/FileSystem.h>
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#include <LibMain/Main.h>
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#include <LibTimeZone/TimeZone.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <time.h>
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static DeprecatedString program_name;
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template<typename... Parameters>
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[[noreturn]] static void err(CheckedFormatString<Parameters...>&& fmtstr, Parameters const&... parameters)
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{
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warn("{}: ", program_name);
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warnln(move(fmtstr), parameters...);
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exit(1);
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}
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inline bool validate_timestamp(unsigned year, unsigned month, unsigned day, unsigned hour, unsigned minute, unsigned second)
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{
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return (year >= 1970) && (month >= 1 && month <= 12) && (day >= 1 && day <= static_cast<unsigned>(days_in_month(year, month))) && (hour <= 23) && (minute <= 59) && (second <= 59);
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}
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static void parse_time(StringView input_time, timespec& atime, timespec& mtime)
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{
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// Parse [[CC]YY]MMDDhhmm[.SS] format, where brackets signify optional
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// parameters.
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if (input_time.length() < 8)
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err("invalid time format '{}' -- too short", input_time);
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else if (input_time.length() > 15)
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err("invalid time format '{}' -- too long", input_time);
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Vector<u8> parameters;
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GenericLexer lexer(input_time);
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unsigned year, month, day, hour, minute, second;
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auto lex_number = [&]() {
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auto literal = lexer.consume(2);
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if (literal.length() < 2)
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err("invalid time format '{}' -- expected 2 digits per parameter", input_time);
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auto maybe_parameter = literal.to_uint();
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if (maybe_parameter.has_value())
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parameters.append(maybe_parameter.value());
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else
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err("invalid time format '{}'", input_time);
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};
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while (!lexer.is_eof() && lexer.next_is(is_ascii_digit))
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lex_number();
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if (parameters.size() > 6)
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err("invalid time format '{}' -- too many parameters", input_time);
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if (lexer.consume_specific('.')) {
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lex_number();
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second = parameters.take_last();
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} else {
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second = 0;
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}
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auto current_year = seconds_since_epoch_to_year(time(nullptr));
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auto current_century = current_year / 100;
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if (parameters.size() == 6)
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year = parameters.take_first() * 100 + parameters.take_first();
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else if (parameters.size() == 5)
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year = current_century * 100 + parameters.take_first();
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else
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year = current_year;
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minute = parameters.take_last();
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hour = parameters.take_last();
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day = parameters.take_last();
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month = parameters.take_last();
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if (validate_timestamp(year, month, day, hour, minute, second))
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atime = mtime = AK::UnixDateTime::from_unix_time_parts(year, month, day, hour, minute, second, 0).to_timespec();
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else
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err("invalid time format '{}'", input_time);
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}
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static void parse_datetime(StringView input_datetime, timespec& atime, timespec& mtime)
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{
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// Parse YYYY-MM-DDThh:mm:SS[.frac][tz] or YYYY-MM-DDThh:mm:SS[,frac][tz]
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// formats, where brackets signify optional parameters.
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GenericLexer lexer(input_datetime);
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unsigned year, month, day, hour, minute, second, millisecond;
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StringView time_zone;
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auto lex_number = [&](unsigned& value, size_t n) {
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auto maybe_value = lexer.consume(n).to_uint();
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if (!maybe_value.has_value())
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err("invalid datetime format '{}' -- expected number at index {}", input_datetime, lexer.tell());
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else
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value = maybe_value.value();
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};
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lex_number(year, 4);
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if (!lexer.consume_specific('-'))
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err("invalid datetime format '{}' -- expected '-' after year", input_datetime);
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lex_number(month, 2);
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if (!lexer.consume_specific('-'))
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err("invalid datetime format '{}' -- expected '-' after month", input_datetime);
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lex_number(day, 2);
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// Parse the time designator -- a single 'T' or ' ' according to POSIX.
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if (!lexer.consume_specific('T') && !lexer.consume_specific(' '))
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err("invalid datetime format '{}' -- expected 'T' or ' ' for time designator", input_datetime);
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lex_number(hour, 2);
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if (!lexer.consume_specific(':'))
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err("invalid datetime format '{}' -- expected ':' after hour", input_datetime);
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lex_number(minute, 2);
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if (!lexer.consume_specific(':'))
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err("invalid datetime format '{}' -- expected ':' after minute", input_datetime);
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lex_number(second, 2);
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millisecond = 0;
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if (!lexer.is_eof()) {
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if (lexer.consume_specific(',') || lexer.consume_specific('.')) {
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auto fractional_second = lexer.consume_while(is_ascii_digit);
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if (fractional_second.is_empty())
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err("invalid datetime format '{}' -- expected floating seconds", input_datetime);
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for (u8 i = 0; i < 3 && i < fractional_second.length(); ++i) {
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unsigned n = fractional_second[i] - '0';
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switch (i) {
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case 0:
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millisecond += 100 * n;
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break;
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case 1:
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millisecond += 10 * n;
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break;
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case 2:
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millisecond += n;
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break;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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}
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time_zone = lexer.consume_all();
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if (!time_zone.is_empty() && time_zone != "Z")
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err("invalid datetime format '{}' -- failed to parse time zone", input_datetime);
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}
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if (validate_timestamp(year, month, day, hour, minute, second)) {
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auto timestamp = AK::UnixDateTime::from_unix_time_parts(year, month, day, hour, minute, second, millisecond);
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auto time = timestamp.to_timespec();
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if (time_zone.is_empty() && TimeZone::system_time_zone() != "UTC") {
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auto offset = TimeZone::get_time_zone_offset(TimeZone::system_time_zone(), timestamp);
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if (offset.has_value())
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time.tv_sec -= offset.value().seconds;
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else
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err("failed to get the system time zone");
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}
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atime = mtime = time;
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} else {
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err("invalid datetime format '{}'", input_datetime);
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}
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}
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static void reference_time(StringView reference_path, timespec& atime, timespec& mtime)
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{
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auto maybe_buffer = Core::System::stat(reference_path);
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if (maybe_buffer.is_error())
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err("failed to reference times of '{}': {}", reference_path, maybe_buffer.release_error());
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auto buffer = maybe_buffer.release_value();
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atime.tv_sec = buffer.st_atime;
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atime.tv_nsec = buffer.st_atim.tv_nsec;
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mtime.tv_sec = buffer.st_mtime;
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mtime.tv_nsec = buffer.st_mtim.tv_nsec;
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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 cpath fattr"));
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program_name = arguments.strings[0];
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Vector<DeprecatedString> paths;
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timespec times[2];
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auto& atime = times[0];
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auto& mtime = times[1];
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bool update_atime = false;
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bool update_mtime = false;
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bool no_create_file = false;
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DeprecatedString input_datetime = "";
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DeprecatedString input_time = "";
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DeprecatedString reference_path = "";
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Core::ArgsParser args_parser;
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args_parser.set_general_help("Create a file or update file access time and/or modification time.");
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args_parser.add_ignored(nullptr, 'f');
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args_parser.add_option(update_atime, "Change access time of file", nullptr, 'a');
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args_parser.add_option(no_create_file, "Do not create a file if it does not exist", nullptr, 'c');
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args_parser.add_option(update_mtime, "Change modification time of file", nullptr, 'm');
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args_parser.add_option(input_datetime, "Use specified datetime instead of current time", nullptr, 'd', "datetime");
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args_parser.add_option(input_time, "Use specified time instead of current time", nullptr, 't', "time");
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args_parser.add_option(reference_path, "Use time of file specified by reference path instead of current time", nullptr, 'r', "reference");
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args_parser.add_positional_argument(paths, "Files to touch", "path", Core::ArgsParser::Required::Yes);
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args_parser.parse(arguments);
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if (input_datetime.is_empty() + input_time.is_empty() + reference_path.is_empty() < 2)
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err("cannot specify a time with more than one option");
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if (!input_datetime.is_empty())
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parse_datetime(input_datetime, atime, mtime);
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else if (!input_time.is_empty())
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parse_time(input_time, atime, mtime);
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else if (!reference_path.is_empty())
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reference_time(reference_path, atime, mtime);
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else
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atime.tv_nsec = mtime.tv_nsec = UTIME_NOW;
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// According to POSIX, if neither -a nor -m are specified, then the program
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// should behave as if both are specified.
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if (!update_atime && !update_mtime)
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update_atime = update_mtime = true;
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if (update_atime && !update_mtime)
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mtime.tv_nsec = UTIME_OMIT;
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if (update_mtime && !update_atime)
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atime.tv_nsec = UTIME_OMIT;
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auto has_errors = false;
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for (auto path : paths) {
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if (FileSystem::exists(path)) {
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if (utimensat(AT_FDCWD, path.characters(), times, 0) == -1) {
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warnln("failed to touch '{}': {}", path, strerror(errno));
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has_errors = true;
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}
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} else if (!no_create_file) {
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auto error_or_fd = Core::System::open(path, O_CREAT, 0100644);
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if (error_or_fd.is_error()) {
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warnln("failed to open '{}': {}", path, strerror(error_or_fd.error().code()));
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has_errors = true;
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continue;
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}
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if (futimens(error_or_fd.value(), times) == -1) {
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warnln("failed to touch '{}': {}", path, strerror(errno));
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has_errors = true;
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continue;
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}
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(void)Core::System::close(error_or_fd.value());
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}
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}
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return has_errors ? 1 : 0;
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}
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