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transmission/utils/create.cc

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// This file Copyright © 2012-2023 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#include <array>
#include <cstdio>
#include <cstdlib> // for strtoul()
#include <chrono>
#include <cstdint> // for uint32_t
#include <future>
#include <optional>
#include <string>
#include <string_view>
#include <utility>
#include <vector>
#include <fmt/core.h>
#include <libtransmission/transmission.h>
#include <libtransmission/announce-list.h>
#include <libtransmission/error.h>
#include <libtransmission/file.h>
#include <libtransmission/log.h>
#include <libtransmission/makemeta.h>
#include <libtransmission/torrent-files.h>
#include <libtransmission/tr-getopt.h>
#include <libtransmission/utils.h>
#include <libtransmission/version.h>
#include "units.h"
using namespace std::literals;
namespace
{
char constexpr MyName[] = "transmission-create";
char constexpr Usage[] = "Usage: transmission-create [options] <file|directory>";
uint32_t constexpr KiB = 1024;
auto constexpr Options = std::array<tr_option, 10>{
{ { 'p', "private", "Allow this torrent to only be used with the specified tracker(s)", "p", false, nullptr },
{ 'r', "source", "Set the source for private trackers", "r", true, "<source>" },
{ 'o', "outfile", "Save the generated .torrent to this filename", "o", true, "<file>" },
{ 's', "piecesize", "Set the piece size in KiB, overriding the preferred default", "s", true, "<KiB>" },
{ 'c', "comment", "Add a comment", "c", true, "<comment>" },
{ 't', "tracker", "Add a tracker's announce URL", "t", true, "<url>" },
{ 'w', "webseed", "Add a webseed URL", "w", true, "<url>" },
{ 'x', "anonymize", R"(Omit "Creation date" and "Created by" info)", nullptr, false, nullptr },
{ 'V', "version", "Show version number and exit", "V", false, nullptr },
{ 0, nullptr, nullptr, nullptr, false, nullptr } }
};
struct app_options
{
tr_announce_list trackers;
std::vector<std::string> webseeds;
std::string outfile;
std::string_view comment;
std::string_view infile;
std::string_view source;
uint32_t piece_size = 0;
bool anonymize = false;
bool is_private = false;
bool show_version = false;
};
int parseCommandLine(app_options& options, int argc, char const* const* argv)
{
int c;
char const* optarg;
while ((c = tr_getopt(Usage, argc, argv, std::data(Options), &optarg)) != TR_OPT_DONE)
{
switch (c)
{
case 'V':
options.show_version = true;
break;
case 'p':
options.is_private = true;
break;
case 'o':
options.outfile = optarg;
break;
case 'c':
options.comment = optarg;
break;
case 't':
options.trackers.add(optarg, options.trackers.nextTier());
break;
case 'w':
options.webseeds.emplace_back(optarg);
break;
case 's':
if (optarg != nullptr)
{
char* endptr = nullptr;
options.piece_size = strtoul(optarg, &endptr, 10) * KiB;
if (endptr != nullptr && *endptr == 'M')
{
options.piece_size *= KiB;
}
}
break;
case 'r':
options.source = optarg;
break;
case 'x':
options.anonymize = true;
break;
case TR_OPT_UNK:
options.infile = optarg;
break;
default:
return 1;
}
}
return 0;
}
std::string tr_getcwd()
{
tr_error* error = nullptr;
auto cur = tr_sys_dir_get_current(&error);
if (error != nullptr)
{
fprintf(stderr, "getcwd error: \"%s\"", error->message);
tr_error_free(error);
}
return cur;
}
} // namespace
int tr_main(int argc, char* argv[])
{
tr_locale_set_global("");
tr_logSetLevel(TR_LOG_ERROR);
tr_formatter_mem_init(MemK, MemKStr, MemMStr, MemGStr, MemTStr);
tr_formatter_size_init(DiskK, DiskKStr, DiskMStr, DiskGStr, DiskTStr);
tr_formatter_speed_init(SpeedK, SpeedKStr, SpeedMStr, SpeedGStr, SpeedTStr);
auto options = app_options{};
if (parseCommandLine(options, argc, (char const* const*)argv) != 0)
{
return EXIT_FAILURE;
}
if (options.show_version)
{
fprintf(stderr, "%s %s\n", MyName, LONG_VERSION_STRING);
return EXIT_SUCCESS;
}
if (std::empty(options.infile))
{
fprintf(stderr, "ERROR: No input file or directory specified.\n");
tr_getopt_usage(MyName, Usage, std::data(Options));
fprintf(stderr, "\n");
return EXIT_FAILURE;
}
if (std::empty(options.outfile))
{
tr_error* error = nullptr;
auto const base = tr_sys_path_basename(options.infile, &error);
if (std::empty(base))
{
fprintf(stderr, "ERROR: Cannot deduce output path from input path: %s\n", error->message);
return EXIT_FAILURE;
}
options.outfile = fmt::format("{:s}/{:s}.torrent"sv, tr_getcwd(), base);
}
if (std::empty(options.trackers))
{
if (options.is_private)
{
fprintf(stderr, "ERROR: no trackers specified for a private torrent\n");
return EXIT_FAILURE;
}
else
{
printf("WARNING: no trackers specified\n");
}
}
fmt::print("Creating torrent \"{:s}\"\n", options.outfile);
auto builder = tr_metainfo_builder(options.infile);
auto const n_files = builder.file_count();
if (n_files == 0U)
{
fprintf(stderr, "ERROR: Cannot find specified input file or directory.\n");
return EXIT_FAILURE;
}
for (tr_file_index_t i = 0; i < n_files; ++i)
{
auto const& path = builder.path(i);
if (!tr_torrent_files::isSubpathPortable(path))
{
fmt::print(stderr, "WARNING\n");
fmt::print(stderr, "filename \"{:s}\" may not be portable on all systems.\n", path);
fmt::print(stderr, "consider \"{:s}\" instead.\n", tr_torrent_files::makeSubpathPortable(path));
}
}
if (options.piece_size != 0 && !builder.set_piece_size(options.piece_size))
{
fmt::print(stderr, "ERROR: piece size must be at least 16 KiB and must be a power of two.\n");
return EXIT_FAILURE;
}
fmt::print(
tr_ngettext("{file_count:L} file, {total_size}\n", "{file_count:L} files, {total_size}\n", builder.file_count()),
fmt::arg("file_count", builder.file_count()),
fmt::arg("total_size", tr_formatter_size_B(builder.total_size())));
fmt::print(
tr_ngettext(
"{piece_count:L} piece, {piece_size}\n",
"{piece_count:L} pieces, {piece_size} each\n",
builder.piece_count()),
fmt::arg("piece_count", builder.piece_count()),
fmt::arg("piece_size", tr_formatter_size_B(builder.piece_size())));
if (!std::empty(options.comment))
{
builder.set_comment(options.comment);
}
if (!std::empty(options.source))
{
builder.set_source(options.source);
}
builder.set_private(options.is_private);
builder.set_anonymize(options.anonymize);
builder.set_webseeds(std::move(options.webseeds));
builder.set_announce_list(std::move(options.trackers));
auto future = builder.make_checksums();
auto last = std::optional<tr_piece_index_t>{};
while (future.wait_for(std::chrono::milliseconds(500)) != std::future_status::ready)
{
auto const [current, total] = builder.checksum_status();
if (!last || current != *last)
{
fmt::print("\rPiece {:d}/{:d} ...", current, total);
fflush(stdout);
last = current;
}
}
fmt::print(" ");
if (tr_error* error = future.get(); error != nullptr)
{
fmt::print("ERROR: {:s} {:d}\n", error->message, error->code);
tr_error_free(error);
return EXIT_FAILURE;
}
if (tr_error* error = nullptr; !builder.save(options.outfile, &error))
{
fmt::print("ERROR: could not save \"{:s}\": {:s} {:d}\n", options.outfile, error->message, error->code);
tr_error_free(error);
return EXIT_FAILURE;
}
fmt::print("done!\n");
return EXIT_SUCCESS;
}
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