DiskManipulator.cc

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#include "DiskManipulator.hh"
#include "DiskContainer.hh"
#include "MSXtar.hh"
#include "DiskImageUtils.hh"
#include "DSKDiskImage.hh"
#include "DiskPartition.hh"
#include "CommandException.hh"
#include "Reactor.hh"
#include "File.hh"
#include "Filename.hh"
#include "FileContext.hh"
#include "FileException.hh"
#include "FileOperations.hh"
#include "SectorBasedDisk.hh"
#include "StringOp.hh"
#include "TclObject.hh"
#include "one_of.hh"
#include "ranges.hh"
#include "static_vector.hh"
#include "stl.hh"
#include "strCat.hh"
#include "view.hh"
#include "xrange.hh"
#include <cassert>
#include <cctype>
#include <memory>
 
using std::string;
using std::string_view;
 
namespace openmsx {
 
DiskManipulator::DiskManipulator(CommandController& commandController_,
                                 Reactor& reactor_)
        : Command(commandController_, "diskmanipulator")
        , reactor(reactor_)
{
}
 
DiskManipulator::~DiskManipulator()
{
        assert(drives.empty()); // all DiskContainers must be unregistered
}
 
string DiskManipulator::getMachinePrefix() const
{
        string_view id = reactor.getMachineID();
        return id.empty() ? string{} : strCat(id, "::");
}
 
void DiskManipulator::registerDrive(
        DiskContainer& drive, std::string_view prefix)
{
        assert(findDriveSettings(drive) == end(drives));
        DriveSettings driveSettings;
        driveSettings.drive = &drive;
        driveSettings.driveName = strCat(prefix, drive.getContainerName());
        driveSettings.partition = 0;
        for (unsigned i = 0; i <= MAX_PARTITIONS; ++i) {
                driveSettings.workingDir[i] = '/';
        }
        drives.push_back(driveSettings);
}
 
void DiskManipulator::unregisterDrive(DiskContainer& drive)
{
        auto it = findDriveSettings(drive);
        assert(it != end(drives));
        move_pop_back(drives, it);
}
 
DiskManipulator::Drives::iterator DiskManipulator::findDriveSettings(
        DiskContainer& drive)
{
        return ranges::find(drives, &drive, &DriveSettings::drive);
}
 
DiskManipulator::Drives::iterator DiskManipulator::findDriveSettings(
        string_view driveName)
{
        return ranges::find(drives, driveName, &DriveSettings::driveName);
}
 
DiskManipulator::DriveSettings& DiskManipulator::getDriveSettings(
        string_view diskname)
{
        // first split-off the end numbers (if present)
        // these will be used as partition indication
        auto pos1 = diskname.find("::");
        auto tmp1 = (pos1 == string_view::npos) ? diskname : diskname.substr(pos1);
        auto pos2 = tmp1.find_first_of("0123456789");
        auto pos1b = (pos1 == string_view::npos) ? 0 : pos1;
        auto tmp2 = diskname.substr(0, pos2 + pos1b);
 
        auto it = findDriveSettings(tmp2);
        if (it == end(drives)) {
                it = findDriveSettings(tmpStrCat(getMachinePrefix(), tmp2));
                if (it == end(drives)) {
                        throw CommandException("Unknown drive: ", tmp2);
                }
        }
 
        auto* disk = it->drive->getSectorAccessibleDisk();
        if (!disk) {
                // not a SectorBasedDisk
                throw CommandException("Unsupported disk type.");
        }
 
        if (pos2 == string_view::npos) {
                // whole disk
                it->partition = 0;
        } else {
                auto partitionName = diskname.substr(pos2);
                auto partition = StringOp::stringToBase<10, unsigned>(partitionName);
                if (!partition) {
                        throw CommandException("Invalid partition name: ", partitionName);
                }
                DiskImageUtils::checkFAT12Partition(*disk, *partition);
                it->partition = *partition;
        }
        return *it;
}
 
DiskPartition DiskManipulator::getPartition(
        const DriveSettings& driveData)
{
        auto* disk = driveData.drive->getSectorAccessibleDisk();
        assert(disk);
        return DiskPartition(*disk, driveData.partition);
}
 
 
void DiskManipulator::execute(span<const TclObject> tokens, TclObject& result)
{
        if (tokens.size() == 1) {
                throw CommandException("Missing argument");
        }
 
        string_view subcmd = tokens[1].getString();
        if (((tokens.size() != 4)                     && (subcmd == one_of("savedsk", "mkdir"))) ||
            ((tokens.size() != 3)                     && (subcmd ==        "dir"             ))  ||
            ((tokens.size() < 3 || tokens.size() > 4) && (subcmd == one_of("format", "chdir")))  ||
            ((tokens.size() < 4)                      && (subcmd == one_of("export", "import", "create")))) {
                throw CommandException("Incorrect number of parameters");
        }
 
        if (subcmd == "export") {
                string_view dir = tokens[3].getString();
                auto directory = FileOperations::expandTilde(string(dir));
                if (!FileOperations::isDirectory(directory)) {
                        throw CommandException(dir, " is not a directory");
                }
                auto& settings = getDriveSettings(tokens[2].getString());
                span<const TclObject> lists(std::begin(tokens) + 4, std::end(tokens));
                exprt(settings, directory, lists);
 
        } else if (subcmd == "import") {
                auto& settings = getDriveSettings(tokens[2].getString());
                span<const TclObject> lists(std::begin(tokens) + 3, std::end(tokens));
                result = import(settings, lists);
 
        } else if (subcmd == "savedsk") {
                auto& settings = getDriveSettings(tokens[2].getString());
                savedsk(settings, FileOperations::expandTilde(string(tokens[3].getString())));
 
        } else if (subcmd == "chdir") {
                auto& settings = getDriveSettings(tokens[2].getString());
                if (tokens.size() == 3) {
                        result = tmpStrCat("Current directory: ",
                                           settings.workingDir[settings.partition]);
                } else {
                        result = chdir(settings, tokens[3].getString());
                }
 
        } else if (subcmd == "mkdir") {
                auto& settings = getDriveSettings(tokens[2].getString());
                mkdir(settings, tokens[3].getString());
 
        } else if (subcmd == "create") {
                create(tokens);
 
        } else if (subcmd == "format") {
                bool dos1 = false;
                string_view drive = tokens[2].getString();
                if (tokens.size() == 4) {
                        if (drive == "-dos1") {
                                dos1 = true;
                                drive = tokens[3].getString();
                        } else if (tokens[3] == "-dos1") {
                                dos1 = true;
                        }
                }
                auto& settings = getDriveSettings(drive);
                format(settings, dos1);
 
        } else if (subcmd == "dir") {
                auto& settings = getDriveSettings(tokens[2].getString());
                result = dir(settings);
 
        } else {
                throw CommandException("Unknown subcommand: ", subcmd);
        }
}
 
string DiskManipulator::help(span<const TclObject> tokens) const
{
        string helptext;
        if (tokens.size() >= 2) {
          if (tokens[1] == "import") {
          helptext =
            "diskmanipulator import <disk name> <host directory|host file>\n"
            "Import all files and subdirs from the host OS as specified into the <disk name> in the\n"
            "current MSX subdirectory as was specified with the last chdir command.\n";
          } else if (tokens[1] == "export") {
          helptext =
            "diskmanipulator export <disk name> <host directory>\n"
            "Extract all files and subdirs from the MSX subdirectory specified with the chdir command\n"
            "from <disk name> to the host OS in <host directory>.\n";
          } else if (tokens[1] == "savedsk") {
          helptext =
            "diskmanipulator savedsk <disk name> <dskfilename>\n"
            "Save the complete drive content to <dskfilename>, it is not possible to save just one\n"
            "partition. The main purpose of this command is to make it possible to save a 'ramdsk' into\n"
            "a file and to take 'live backups' of dsk-files in use.\n";
          } else if (tokens[1] == "chdir") {
          helptext =
            "diskmanipulator chdir <disk name> <MSX directory>\n"
            "Change the working directory on <disk name>. This will be the directory were the 'import',\n"
            "'export' and 'dir' commands will work on.\n"
            "In case of a partitioned drive, each partition has its own working directory.\n";
          } else if (tokens[1] == "mkdir") {
          helptext =
            "diskmanipulator mkdir <disk name> <MSX directory>\n"
            "Create the specified directory on <disk name>. If needed, all missing parent directories\n"
            "are created at the same time. Accepts both absolute and relative path names.\n";
          } else if (tokens[1] == "create") {
          helptext =
            "diskmanipulator create <dskfilename> <size/option> [<size/option>...]\n"
            "Create a formatted dsk file with the given size.\n"
            "If multiple sizes are given, a partitioned disk image will be created with each partition\n"
            "having the size as indicated. By default the sizes are expressed in kilobyte, add the\n"
            "postfix M for megabyte.\n"
            "When using the -dos1 option, the boot sector of the created image will be MSX-DOS1\n"
            "compatible.\n";
          } else if (tokens[1] == "format") {
          helptext =
            "diskmanipulator format <disk name>\n"
            "formats the current (partition on) <disk name> with a regular FAT12 MSX filesystem with an\n"
            "MSX-DOS2 boot sector, or, when the -dos1 option is specified, with an MSX-DOS1 boot sector.\n";
          } else if (tokens[1] == "dir") {
          helptext =
            "diskmanipulator dir <disk name>\n"
            "Shows the content of the current directory on <disk name>\n";
          } else {
          helptext = strCat("Unknown diskmanipulator subcommand: ", tokens[1].getString());
          }
        } else {
          helptext =
            "diskmanipulator create <fn> <sz> [<sz> ...]  : create a formatted dsk file with name <fn>\n"
            "                                               having the given (partition) size(s)\n"
            "diskmanipulator savedsk <disk name> <fn>     : save <disk name> as dsk file named as <fn>\n"
            "diskmanipulator format <disk name>           : format (a partition) on <disk name>\n"
            "diskmanipulator chdir <disk name> <MSX dir>  : change directory on <disk name>\n"
            "diskmanipulator mkdir <disk name> <MSX dir>  : create directory on <disk name>\n"
            "diskmanipulator dir <disk name>              : long format file listing of current\n"
            "                                               directory on <disk name>\n"
            "diskmanipulator import <disk> <dir/file> ... : import files and subdirs from <dir/file>\n"
            "diskmanipulator export <disk> <host dir>     : export all files on <disk> to <host dir>\n"
            "For more info use 'help diskmanipulator <subcommand>'.\n";
        }
        return helptext;
}
 
void DiskManipulator::tabCompletion(std::vector<string>& tokens) const
{
        using namespace std::literals;
        if (tokens.size() == 2) {
                static constexpr std::array cmds = {
                        "import"sv, "export"sv, "savedsk"sv, "dir"sv, "create"sv,
                        "format"sv, "chdir"sv, "mkdir"sv,
                };
                completeString(tokens, cmds);
 
        } else if ((tokens.size() == 3) && (tokens[1] == "create")) {
                completeFileName(tokens, userFileContext());
 
        } else if (tokens.size() == 3) {
                std::vector<string> names;
                if (tokens[1] == one_of("format", "create")) {
                        names.emplace_back("-dos1");
                }
                for (const auto& d : drives) {
                        const auto& name1 = d.driveName; // with prexix
                        const auto& name2 = d.drive->getContainerName(); // without prefix
                        append(names, {name1, std::string(name2)});
                        // if it has partitions then we also add the partition
                        // numbers to the autocompletion
                        if (auto* disk = d.drive->getSectorAccessibleDisk()) {
                                for (unsigned i = 1; i <= MAX_PARTITIONS; ++i) {
                                        try {
                                                DiskImageUtils::checkFAT12Partition(*disk, i);
                                                append(names,
                                                       {strCat(name1, i), strCat(name2, i)});
                                        } catch (MSXException&) {
                                                // skip invalid partition
                                        }
                                }
                        }
                }
                completeString(tokens, names);
 
        } else if (tokens.size() >= 4) {
                if (tokens[1] == one_of("savedsk", "import", "export")) {
                        completeFileName(tokens, userFileContext());
                } else if (tokens[1] == "create") {
                        static constexpr std::array cmds = {
                                "360"sv, "720"sv, "32M"sv, "-dos1"sv,
                        };
                        completeString(tokens, cmds);
                } else if (tokens[1] == "format") {
                        static constexpr std::array cmds = {"-dos1"sv};
                        completeString(tokens, cmds);
                }
        }
}
 
void DiskManipulator::savedsk(const DriveSettings& driveData,
                              string filename)
{
        auto partition = getPartition(driveData);
        SectorBuffer buf;
        File file(std::move(filename), File::CREATE);
        for (auto i : xrange(partition.getNbSectors())) {
                partition.readSector(i, buf);
                file.write(&buf, sizeof(buf));
        }
}
 
void DiskManipulator::create(span<const TclObject> tokens)
{
        static_vector<unsigned, MAX_PARTITIONS> sizes;
        unsigned totalSectors = 0;
        bool dos1 = false;
 
        for (const auto& token : view::drop(tokens, 3)) {
                if (token == "-dos1") {
                        dos1 = true;
                        continue;
                }
 
                if (sizes.size() >= MAX_PARTITIONS) {
                        throw CommandException(
                                "Maximum number of partitions is ", MAX_PARTITIONS);
                }
                auto tok = token.getString();
                char* q;
                int sectors = strtol(tok.c_str(), &q, 0);
                int scale = 1024; // default is kilobytes
                if (*q) {
                        if ((q == tok.c_str()) || *(q + 1)) {
                                throw CommandException("Invalid size: ", tok);
                        }
                        switch (tolower(*q)) {
                                case 'b':
                                        scale = 1;
                                        break;
                                case 'k':
                                        scale = 1024;
                                        break;
                                case 'm':
                                        scale = 1024 * 1024;
                                        break;
                                case 's':
                                        scale = SectorBasedDisk::SECTOR_SIZE;
                                        break;
                                default:
                                        throw CommandException("Invalid suffix: ", q);
                        }
                }
                sectors = (sectors * scale) / SectorBasedDisk::SECTOR_SIZE;
                // for a 32MB disk or greater the sectors would be >= 65536
                // since MSX use 16 bits for this, in case of sectors = 65536
                // the truncated word will be 0 -> formatted as 320 Kb disk!
                if (sectors > 65535) sectors = 65535; // this is the max size for fat12 :-)
 
                // TEMP FIX: the smallest bootsector we create in MSXtar is for
                // a normal single sided disk.
                // TODO: MSXtar must be altered and this temp fix must be set to
                // the real smallest dsk possible (= bootsector + minimal fat +
                // minimal dir + minimal data clusters)
                if (sectors < 720) sectors = 720;
 
                sizes.push_back(sectors);
                totalSectors += sectors;
        }
        if (sizes.empty()) {
                throw CommandException("No size(s) given.");
        }
        if (sizes.size() > 1) {
                // extra sector for partition table
                ++totalSectors;
        }
 
        // create file with correct size
        Filename filename(FileOperations::expandTilde(string(tokens[2].getString())));
        try {
                File file(filename, File::CREATE);
                file.truncate(totalSectors * SectorBasedDisk::SECTOR_SIZE);
        } catch (FileException& e) {
                throw CommandException("Couldn't create image: ", e.getMessage());
        }
 
        // initialize (create partition tables and format partitions)
        DSKDiskImage image(filename);
        if (sizes.size() > 1) {
                DiskImageUtils::partition(image, sizes);
        } else {
                // only one partition specified, don't create partition table
                DiskImageUtils::format(image, dos1);
        }
}
 
void DiskManipulator::format(DriveSettings& driveData, bool dos1)
{
        auto partition = getPartition(driveData);
        DiskImageUtils::format(partition, dos1);
        driveData.workingDir[driveData.partition] = '/';
}
 
MSXtar DiskManipulator::getMSXtar(
        SectorAccessibleDisk& disk, DriveSettings& driveData)
{
        if (DiskImageUtils::hasPartitionTable(disk)) {
                throw CommandException("Please select partition number.");
        }
 
        MSXtar result(disk);
        try {
                result.chdir(driveData.workingDir[driveData.partition]);
        } catch (MSXException&) {
                driveData.workingDir[driveData.partition] = '/';
                throw CommandException(
                        "Directory ", driveData.workingDir[driveData.partition],
                        " doesn't exist anymore. Went back to root "
                        "directory. Command aborted, please retry.");
        }
        return result;
}
 
string DiskManipulator::dir(DriveSettings& driveData)
{
        auto partition = getPartition(driveData);
        auto workhorse = getMSXtar(partition, driveData);
        return workhorse.dir();
}
 
string DiskManipulator::chdir(DriveSettings& driveData, string_view filename)
{
        auto partition = getPartition(driveData);
        auto workhorse = getMSXtar(partition, driveData);
        try {
                workhorse.chdir(filename);
        } catch (MSXException& e) {
                throw CommandException("chdir failed: ", e.getMessage());
        }
        // TODO clean-up this temp hack, used to enable relative paths
        string& cwd = driveData.workingDir[driveData.partition];
        if (StringOp::startsWith(filename, '/')) {
                cwd = filename;
        } else {
                if (!StringOp::endsWith(cwd, '/')) cwd += '/';
                cwd.append(filename.data(), filename.size());
        }
        return "New working directory: " + cwd;
}
 
void DiskManipulator::mkdir(DriveSettings& driveData, string_view filename)
{
        auto partition = getPartition(driveData);
        auto workhorse = getMSXtar(partition, driveData);
        try {
                workhorse.mkdir(filename);
        } catch (MSXException& e) {
                throw CommandException(std::move(e).getMessage());
        }
}
 
string DiskManipulator::import(DriveSettings& driveData,
                               span<const TclObject> lists)
{
        auto partition = getPartition(driveData);
        auto workhorse = getMSXtar(partition, driveData);
 
        string messages;
        auto& interp = getInterpreter();
        for (const auto& l : lists) {
                for (auto i : xrange(l.getListLength(interp))) {
                        auto s = FileOperations::expandTilde(string(l.getListIndex(interp, i).getString()));
                        try {
                                FileOperations::Stat st;
                                if (!FileOperations::getStat(s, st)) {
                                        throw CommandException(
                                                "Non-existing file ", s);
                                }
                                if (FileOperations::isDirectory(st)) {
                                        messages += workhorse.addDir(s);
                                } else if (FileOperations::isRegularFile(st)) {
                                        messages += workhorse.addFile(s);
                                } else {
                                        // ignore other stuff (sockets, device nodes, ..)
                                        strAppend(messages, "Ignoring ", s, '\n');
                                }
                        } catch (MSXException& e) {
                                throw CommandException(std::move(e).getMessage());
                        }
                }
        }
        return messages;
}
 
void DiskManipulator::exprt(DriveSettings& driveData, string_view dirname,
                            span<const TclObject> lists)
{
        auto partition = getPartition(driveData);
        auto workhorse = getMSXtar(partition, driveData);
        try {
                if (lists.empty()) {
                        // export all
                        workhorse.getDir(dirname);
                } else {
                        for (const auto& l : lists) {
                                workhorse.getItemFromDir(dirname, l.getString());
                        }
                }
        } catch (MSXException& e) {
                throw CommandException(std::move(e).getMessage());
        }
}
 
} // namespace openmsx