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backends.cpp
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backends.cpp
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/*
* Copyright (C) Pedram Pourang (aka Tsu Jan) 2018-2023 <[email protected]>
*
* Arqiver is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Arqiver is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @license GPL-3.0+ <https://spdx.org/licenses/GPL-3.0+.html>
*/
#include "backends.h"
#include <QFile>
#include <QDir>
#include <QUrl>
#include <QCoreApplication>
#include <QTimer>
#include <QStandardPaths>
#include <QDesktopServices>
#include <QMimeDatabase>
#include <QMimeData>
#include <QRegularExpression>
#ifdef Q_OS_LINUX
#define TAR_CMD "bsdtar"
#else
#define TAR_CMD "tar"
#endif
namespace Arqiver {
static const QRegularExpression newlineExp("(?<!\\\\)\\\\n");
static const QRegularExpression tabExp("(?<!\\\\)\\\\t");
static const QRegularExpression startBslashExp("(^|/)\\\\"); // used with startBackslash_
Backend::Backend(QObject *parent) : QObject(parent) {
tarCmnd_ = TAR_CMD;
proc_.setProcessChannelMode(QProcess::MergedChannels);
connect(&proc_, QOverload<int, QProcess::ExitStatus>::of(&QProcess::finished), this, &Backend::procFinished);
connect(&proc_, &QProcess::readyReadStandardOutput, this, &Backend::processData);
connect(&proc_, &QProcess::started, this, &Backend::processStarting);
connect(&proc_, &QProcess::errorOccurred, this, &Backend::onError);
isKilled_ = false;
listing_ = false;
isGzip_ = is7z_ = false;
starting7z_ = encryptionQueried_ = encrypted_ = encryptedList_ = false;
startBackslash_ = false; // used only with bsdtar in "Backend::startExtract()"
watcher_ = new QFileSystemWatcher(this);
connect(watcher_, &QFileSystemWatcher::fileChanged, [this](const QString& path) {
/* WARNING: If the parent directory of an extracted file contains unextracted file(s),
bsdtar resets the modification time of the file on extracting the parent
directory with the "-k" option, and so, the watcher emits "fileChanged()".
As a workaround, we keep track of modification times. */
if (QFile::exists(path)) {
bool emitSignal(isGzip_ || is7z_ || !modTimes_.contains(path));
if (!emitSignal) {
QDateTime modTime = QFileInfo(path).lastModified();
if (modTimes_.value(path) < modTime) {
emitSignal = true;
modTimes_.insert(path, modTime);
}
}
if (emitSignal) {
emit fileModified(true);
if (!changedFiles_.contains(path))
changedFiles_ << path;
}
if (!watcher_->files().contains(path)){
watcher_->addPath(path); // recommended by Qt doc
}
}
else
modTimes_.remove(path);
});
}
Backend::~Backend() {
if (!arqiverDir_.isEmpty())
QDir(arqiverDir_).removeRecursively();
}
void Backend::setTarCommand(const QString& cmnd) {
#ifdef Q_OS_LINUX
Q_UNUSED(cmnd);
tarCmnd_ = TAR_CMD;
#else
if (cmnd.isEmpty())
tarCmnd_ = TAR_CMD;
else
tarCmnd_ = cmnd;
#endif
}
QString Backend::getMimeType(const QString &fname) {
QString mimeType, suffix;
int left = fname.indexOf(QLatin1Char('.'));
if (left != -1) {
if (fname.compare("CMakeLists.txt", Qt::CaseInsensitive) == 0) // exception
mimeType = "text/x-cmake";
else {
suffix = fname.right(fname.size() - left - 1);
mimeType = mimeTypes_.value(suffix);
}
}
if (mimeType.isEmpty()) {
QMimeDatabase mimeDatabase;
mimeType = mimeDatabase.mimeTypeForFile(QFileInfo(fname)).name();
if (!suffix.isEmpty())
mimeTypes_.insert(suffix, mimeType);
}
return mimeType;
}
void Backend::loadFile(const QString& path, bool withPassword) {
/* check if the file extraction directory can be made,
but don't create it until a file is viewed */
const QString curTime = QDateTime::currentDateTime().toString("yyyyMMddhhmmsszzz");
if (!arqiverDir_.isEmpty()) {
watcher_->removePaths(watcher_->files());
changedFiles_.clear();
modTimes_.clear();
emit fileModified(false);
QDir(arqiverDir_).removeRecursively();
}
QString cache = QStandardPaths::writableLocation(QStandardPaths::TempLocation);
if (!cache.isEmpty()) {
QDir cacheDir(cache);
if (cacheDir.exists()) {
arqiverDir_ = cache + "/" + "arqiver-" + curTime;
}
}
/*
NOTE: So far, bsdtar, gzip and 7z are supported.
Also, password protected 7z archives can be extracted and created.
7z has two kinds of prompts that we avoid: password and overwrite prompts.
*/
filepath_ = path;
starting7z_ = false;
if (!withPassword) {
pswrd_.clear();
encryptedPaths_.clear();
encrypted_ = encryptedList_ = encryptionQueried_ = false;
}
QString mt = getMimeType(path);
if (mt == "application/gzip" || mt == "application/x-gzpdf" || mt == "image/svg+xml-compressed") {
isGzip_ = true; is7z_ = false;
}
else if (mt == "application/x-7z-compressed"
|| mt == "application/x-ms-dos-executable" || mt == "application/vnd.microsoft.portable-executable" || mt == "application/x-msdownload" || mt == "application/x-msi"
|| mt == "application/vnd.ms-cab-compressed" || mt == "application/vnd.rar"
|| mt == "application/x-cd-image" || mt == "application/vnd.efi.iso" || mt == "application/vnd.appimage"
|| mt == "application/x-xz"
|| mt == "application/zstd"
|| mt == "application/x-ace"
|| mt == "application/x-bzip" || mt == "application/x-bzip1" || mt == "application/x-bzip2" || mt == "application/x-bzpdf" || mt == "application/x-xzpdf"
|| mt == "application/x-apple-diskimage") {
is7z_ = true; isGzip_ = false;
}
else if (mt == "application/x-raw-disk-image" || mt == "application/vnd.efi.img"
|| mt == "application/vnd.snap") {
/* 7z can't open compressed disk images, and bsdtar can't handle uncompressed ones */
QMimeDatabase mimeDatabase;
QString realMt = mimeDatabase.mimeTypeForFile(QFileInfo(path), QMimeDatabase::MatchContent).name();
if (realMt == "application/gzip" || realMt == "application/x-cpio" || realMt == "application/x-xz") {
isGzip_ = is7z_ = false;
}
else {
is7z_ = true; isGzip_ = false;
}
}
else {
isGzip_ = is7z_ = false;
}
tmpfilepath_ = filepath_.section("/", 0, -2) + "/" + ".tmp_arqiver-" + curTime + filepath_.section("/", -1);
fileArgs_.clear();
if (is7z_) {
/*if (path.section("/",-1).section(".",1,-1).split(".").contains("tar"))
fileArgs_ << "-ttar";*/
fileArgs_ << filepath_;
}
else
fileArgs_ << "-f" << filepath_; // add the actual archive path
if (QFile::exists(path))
startList(withPassword);
else {
if (is7z_)
encryptionQueried_ = true; // an empty archive doesn't have encryption (yet)
contents_.clear();
startBackslash_ = false;
emit loadingFinished();
emit loadingSuccessful();
emit processFinished(true, QString());
}
}
bool Backend::canModify(bool *canUpdate) const {
static QStringList validMimeTypes;
if (validMimeTypes.isEmpty()) {
validMimeTypes << "application/zip" << "application/x-compressed-tar" << "application/x-gzpdf" << "image/svg+xml-compressed" << "application/x-xz-compressed-tar" << "application/x-bzip-compressed-tar" << "application/x-bzip1-compressed-tar" << "application/x-bzip2-compressed-tar" << "application/x-tar" << "application/x-lzma-compressed-tar" << "application/x-zstd-compressed-tar" << "application/x-cpio" << /*".pax" <<*/ "application/x-archive" << /*".shar" <<*/ "application/gzip" << "application/x-7z-compressed";
}
static QStringList updatedMimeTypes;
if (updatedMimeTypes.isEmpty()) {
updatedMimeTypes << "application/zstd" << "application/x-bzip" << "application/x-bzip1" << "application/x-bzip2" << "application/x-xz" << "application/vnd.debian.binary-package" << "application/x-rpm" << "application/x-source-rpm";
}
QMimeDatabase mimeDatabase;
QString mimeTypeName = mimeDatabase.mimeTypeForFile(QFileInfo(filepath_)).name();
bool res = archiveSingleRoot_ != "." // not like some rpm archives
&& validMimeTypes.contains(mimeTypeName);
*canUpdate = (archiveSingleRoot_ != "." && (res || updatedMimeTypes.contains(mimeTypeName)));
return res;
}
QString Backend::currentFile() const {
return filepath_;
}
QStringList Backend::hierarchy() const {
return contents_.keys();
}
QString Backend::singleRoot() const {
return archiveSingleRoot_;
}
QString Backend::sizeString(const QString& file) const {
if (contents_.contains(file))
return contents_.value(file).at(1);
return QString();
}
double Backend::size(const QString& file) const {
if (!contents_.contains(file))
return -1;
return contents_.value(file).at(1).toDouble();
}
double Backend::csize(const QString& file) const {
if (!contents_.contains(file))
return -1;
if (is7z_)
return contents_.value(file).at(2).toDouble();
return contents_.value(file).at(1).toDouble();
}
bool Backend::isDir(const QString& file) const {
if (!contents_.contains(file))
return false;
if (is7z_)
return contents_.value(file).at(0).startsWith("D");
return contents_.value(file).at(0).startsWith("d");
}
bool Backend::isLink(const QString& file) const {
if (!contents_.contains(file))
return false;
return contents_.value(file).at(0).startsWith("l");
}
QString Backend::linkTo(const QString& file) const {
if (!contents_.contains(file))
return QString();
return contents_.value(file).at(2);
}
static inline void skipExistingFiles(QString& file) {
QString suffix;
int i = 0;
while (QFile::exists(file + suffix)) {
suffix = "-" + QString::number(i);
i++;
}
file += suffix;
}
// This is only for bsdtar, which uses an ed-like pattern substitution.
// WARNING: Here it is supposed that backslashes are escaped by bsdtar.
static inline QString escapeSpecialChars(const QString& str)
{
QString newStr = str;
newStr.replace("*", "\\*").replace("[", "\\[").replace("^", "\\^")
.replace("$", "\\$").replace("?", "\\?");
return newStr;
}
void Backend::updateArchive() {
if (arqiverDir_.isEmpty() || changedFiles_.isEmpty()
|| !QFile::exists(filepath_)) {
return;
}
QDir dir(arqiverDir_);
if (!dir.exists()) return;
emit fileModified(false);
keyArgs_.clear();
QStringList args;
if (is7z_) {
// only add the top files/folders of the temporary directory; 7z takes care of the rest
QStringList paths;
const QStringList entries = dir.entryList(QDir::NoDotAndDotDot | QDir::Dirs | QDir::Files);
if (entries.isEmpty()) return;
for (const QString &str : entries)
paths << arqiverDir_ + "/" + str;
if (encryptedList_) {
if (pswrd_.isEmpty())
return;
args << "-mhe=on" << "-p" + pswrd_;
}
else if (!pswrd_.isEmpty()) {
args << "-p" + pswrd_;
encrypted_ = true;
}
args << "a" << fileArgs_ << paths;
starting7z_ = true;
keyArgs_ << "a";
proc_.start ("7z", args);
return;
}
emit processStarting();
if (isGzip_) {
args << "--to-stdout" << "--force" << changedFiles_.at(0);
tmpProc_.setStandardOutputFile(filepath_);
tmpProc_.start("gzip", args);
if (tmpProc_.waitForStarted()) {
while (!tmpProc_.waitForFinished(500))
QCoreApplication::processEvents();
}
emit processFinished(tmpProc_.exitCode() == 0, QString());
return;
}
// first remove the files from the archive, waiting until the process is finished...
args << "-c" << "-a";
skipExistingFiles(tmpfilepath_); // practically not required
args << "-f" << tmpfilepath_;
for (const QString &str : std::as_const(changedFiles_))
{
/* WARNING: Since the workaround for bsdtar's escaped backslashes is already applied,
they need to be escaped again, before other special characters are escaped. */
args << "--exclude" << "^" + escapeSpecialChars(str.section('/', 3).replace("\\", "\\\\"));
}
args << "@" + filepath_;
tmpProc_.start(tarCmnd_, args);
if (tmpProc_.waitForStarted()) {
while (!tmpProc_.waitForFinished(500))
QCoreApplication::processEvents();
}
if (QFile::exists(tmpfilepath_)) {
if (tmpProc_.exitCode() == 0) {
QFile::remove(filepath_);
QFile::rename(tmpfilepath_, filepath_);
}
else
QFile::remove(tmpfilepath_);
}
emit processFinished(tmpProc_.exitCode() == 0, QString());
if (tmpProc_.exitCode() != 0)
return;
// ... then add the modified files to the archive with a proper parent path
startAdd(changedFiles_, arqiverDir_);
}
void Backend::startAdd(const QStringList& paths, const QString& parentPath, bool absolutePaths) {
keyArgs_.clear();
QStringList filePaths = paths;
/* exclude the archive itself */
if (filePaths.contains(filepath_))
filePaths.removeAll(filepath_);
/* no path should be a parent folder of the archive */
QString parentDir = filepath_.section("/", 0, -2);
for (int i = 0; !filePaths.isEmpty() && i < filePaths.length(); i++) {
if (parentDir.startsWith(filePaths.at(i))) {
filePaths.removeAt(i);
i--;
}
}
if (filePaths.isEmpty()) return;
/* no path should be repeated */
filePaths.removeDuplicates();
QStringList args;
if (isGzip_) {
emit processStarting();
if (QFile::exists(filepath_)) // the overwrite prompt should be already accepted
args << "--to-stdout" << "--force" << filePaths.at(0);
else
args << "--to-stdout" << filePaths.at(0);
tmpProc_.setStandardOutputFile(filepath_);
tmpProc_.start("gzip", args); // "gzip -c (-f) file > archive.gz"
if (tmpProc_.waitForStarted()) {
while (!tmpProc_.waitForFinished(500))
QCoreApplication::processEvents();
}
emit processFinished(tmpProc_.exitCode() == 0, QString());
loadFile(filepath_);
return; // FIXME: Unfortunately, onError() can't be called here
}
if (is7z_) {
if (encryptedList_) {
/* with an encrypted header, password should be given
(but the operation will fail silently if it's incorrect) */
if (pswrd_.isEmpty())
return;
args << "-mhe=on" << "-p" + pswrd_;
}
else if (!pswrd_.isEmpty()) {
/* always add files with encryption if any */
args << "-p" + pswrd_;
encrypted_ = true;
}
args << "a" << fileArgs_ << filePaths;
starting7z_ = true;
keyArgs_ << "a";
proc_.start ("7z", args);
return;
}
/* NOTE: All paths should have the same parent directory.
Check that, and put the wrong paths into insertQueue_.
(For now, "parentPath" is used only in "updateArchive".) */
const QString parent = parentPath.isEmpty() ? filePaths.at(0).section("/", 0, -2) : parentPath;
insertQueue_.clear();
if (parentPath.isEmpty()) {
for (int i = 1; i < filePaths.length(); i++) {
if (filePaths.at(i).section("/", 0, -2) != parent) {
insertQueue_ << filePaths.takeAt(i);
i--;
}
}
}
args << "-c" << "-a";
bool fileExists(QFile::exists(filepath_));
if (fileExists) { // use a temporary file to append to the existing archive
skipExistingFiles(tmpfilepath_); // practically not required
args << "-f" << tmpfilepath_;
}
else
args << fileArgs_;
/* now, setup the parent dir */
if (!absolutePaths) {
for (int i = 0; i < filePaths.length(); i++) {
filePaths[i] = filePaths[i].section(parent, 1, -1);
if (filePaths[i].startsWith("/"))
filePaths[i].remove(0, 1);
}
args << "-C" << parent;
}
else
args << "-C" << "/";
args << filePaths;
if (fileExists) // append to the existing archive
args << "@" + filepath_;
keyArgs_ << "-c" << "-a" << "-C";
proc_.start(tarCmnd_, args);
}
void Backend::startRemove(const QStringList& paths) {
if (!QFile::exists(filepath_)) return;
keyArgs_.clear();
if (isGzip_) return;
QStringList filePaths = paths;
if (filePaths.contains(filepath_))
filePaths.removeAll(filepath_);
if (contents_.isEmpty() || filePaths.isEmpty() || !QFile::exists(filepath_))
return; // invalid
filePaths.removeDuplicates();
// a modified file may be removed
if (!changedFiles_.isEmpty()) {
for (const QString &str : std::as_const(filePaths))
changedFiles_.removeOne(arqiverDir_ + "/" + str);
if (changedFiles_.isEmpty())
emit fileModified(false);
}
QStringList args;
if (is7z_) {
if (encrypted_)
args << "-p" + pswrd_;
args << "d" << fileArgs_ << filePaths;
starting7z_ = true;
keyArgs_ << "d";
proc_.start("7z", args);
return;
}
args << "-c" << "-a";
skipExistingFiles(tmpfilepath_); // practically not required
args << "-f" << tmpfilepath_;
for (int i = 0; i < filePaths.length(); i++) {
args << "--exclude" << "^" + escapeSpecialChars(filePaths.at(i));
}
args << "@" + filepath_;
keyArgs_ << "-c" << "-a" << "--exclude";
proc_.start(tarCmnd_, args);
}
void Backend::startExtract(const QString& path, const QString& file, bool overwrite, bool preservePaths) {
startExtract(path, QStringList() << file, overwrite, preservePaths);
}
void Backend::startExtract(const QString& path, const QStringList& files, bool overwrite, bool preservePaths) {
if (!QFile::exists(filepath_)) return;
keyArgs_.clear();
if (isGzip_) {
/* if the extraction takes place in the same directory, we could do it
in the usual way, but the standard output method works in all cases */
/*if (0 && path == filepath_.section("/", 0, -2)) {
proc_.start("gzip", QStringList() << "-d" << "-k" << filepath_);
return;
}*/
emit processStarting();
QString extName = filepath_.section("/", -1);
if (extName.contains(".")) {
extName = extName.section(".", 0, -2);
}
if (extName.isEmpty())
extName = "arqiver-extracted";
if (filepath_.endsWith(".svgz") && !extName.endsWith(".svg"))
extName += ".svg";
extName = path + "/" + extName;
skipExistingFiles(extName);
tmpProc_.setStandardOutputFile(extName);
tmpProc_.start("gzip", QStringList() << "-d" << "--to-stdout" << filepath_); // gzip -d -c archive.gz > file
if (tmpProc_.waitForStarted()) {
while (!tmpProc_.waitForFinished(500))
QCoreApplication::processEvents();
}
emit processFinished(tmpProc_.exitCode() == 0, QString());
emit extractionFinished();
emit extractionSuccessful();
return;
}
QStringList args;
QStringList filesList = files;
filesList.removeAll(QString());
if (!filesList.isEmpty()) {
filesList.removeDuplicates();
/* the paths may contain newlines, which have been escaped and are restored here */
filesList.replaceInStrings(newlineExp, "\n").replaceInStrings(tabExp, "\t");
}
bool noFileList(filesList.isEmpty());
if (is7z_) {
if (noFileList)
args << "-aou"; // auto-rename: the archive may contain files with identical names
else if (overwrite)
args << "-aoa"; // overwrite without prompt
else
args << "-aos"; // skip extraction of existing files
if (encrypted_)
args << "-p" + pswrd_;
args << (preservePaths ? "x" : "e") << fileArgs_;
keyArgs_ << "x" << "e";
starting7z_ = true;
}
else {
args << "-x" << "--no-same-owner";
if (!overwrite)
args << "-k";
args << fileArgs_;
if (!noFileList) {
/* If a file comes after its containing folder in the command line,
bsdtar doesn't extract the folder. So, we sort the list and read it inversely. */
filesList.sort();
int N = filesList.length();
for (int i = 0; i < N; i++) {
if (filesList[N - 1 - i].simplified().isEmpty()
// see the end of this function for the reason
|| (startBackslash_ && filesList[N - 1 - i].contains(startBslashExp))) {
filesList.removeAt(N - 1 - i);
continue;
}
args << "--include" << escapeSpecialChars(filesList[N - 1 - i])
<< "--strip-components" << QString::number(filesList[N - 1 - i].count("/"));
}
}
keyArgs_ << "-x";
}
QString xPath = path;
bool archiveRootChanged(false);
/* Prevent overwriting by making an appropriate directory and extracting into it
if the whole archive is going to be extracted (otherwise, overwriting should be handled by GUI) */
if (noFileList) {
QString archiveSingleRoot = archiveSingleRoot_;
if (!archiveSingleRoot.isEmpty() && archiveSingleRoot.startsWith(".")) {
archiveSingleRoot.remove(0, 1); // no hidden extraction folder or single hidden extracted file
archiveRootChanged = true;
}
if (!archiveSingleRoot.isEmpty()) { // is empty with some rpm archives or when an encrypted list isn't known yet
archiveSingleRoot.replace(newlineExp, "\n").replace(tabExp, "\t");
if (!isGzip_ && !is7z_)
archiveSingleRoot.replace("\\\\", "\\"); // WARNING: bsdtar escapes backslashes.
if (QFile::exists(xPath + "/" + archiveSingleRoot)) {
archiveRootChanged = true;
QDir dir (xPath);
QString subdirName = archiveSingleRoot;
xPath += "/" + subdirName;
int i = 0;
QString suffix;
while (QFile::exists(xPath + suffix)) {
suffix = "-" + QString::number(i);
++i;
}
xPath += suffix;
subdirName += suffix;
dir.mkdir(subdirName);
}
else if (archiveRootChanged) {
QDir dir (xPath);
xPath += "/" + archiveSingleRoot;
dir.mkdir(archiveSingleRoot);
}
}
else { // the archive doesn't have a parent dir and isn't a single file
archiveRootChanged = false;
QDir dir(xPath);
QString subdirName = filepath_.section("/", -1);
if (subdirName.contains(".")) {
subdirName = subdirName.section(".", 0, -2);
if (subdirName.endsWith(".tar"))
subdirName = subdirName.section(".", 0, -2);
}
if (subdirName.isEmpty())
subdirName = "arqiver-extracted";
xPath += "/" + subdirName;
int i = 0;
QString suffix;
while (QFile::exists(xPath + suffix)) {
suffix = "-" + QString::number(i);
++i;
}
xPath += suffix;
subdirName += suffix;
dir.mkdir(subdirName);
}
}
if (is7z_) {
args << "-o" + xPath;
if (!noFileList)
args << filesList;
proc_.start("7z", args);
}
else {
if (!noFileList && filesList.isEmpty())
return; // it was emptied above
args << "-C" << xPath;
/* WARNING: Because of a nasty bug in bsdtar, "--strip-components" removes
the start backslash, and so, it can result in a mess. */
if (!startBackslash_ && archiveRootChanged && contents_.size() > 1)
args << "--strip-components" << "1"; // the parent name is changed
keyArgs_ << "-C";
proc_.start(tarCmnd_, args); // doesn't create xPath if not existing
}
}
bool Backend::isEncryptedPath(const QString& path) const {
if (!is7z_) return false;
return (encryptedList_ || encryptedPaths_.contains(path));
}
// Used only with encrypted archives
bool Backend::isSingleExtracted(const QString& archivePath) const {
if (arqiverDir_.isEmpty()) return false;
QString str = archivePath;
if (str.startsWith("./")) // as with some rpm archives
str.remove(0, 2);
return (!str.isEmpty() && QFile::exists(arqiverDir_ + "/" + str));
}
bool Backend::allChildrenExyracted(const QString& parent) const {
if (arqiverDir_.isEmpty()) return false;
const QStringList files = contents_.keys();
if (isDir(parent) || !files.contains(parent)) {
QString p = parent + "/";
for (const auto &file : files) {
if (file != p && file.startsWith(p)) {
QString str = file;
if (str.startsWith("./")) // as with some rpm archives
str.remove(0, 2);
if (!isGzip_ && !is7z_)
str.replace("\\\\", "\\"); // WARNING: bsdtar escapes backslashes.
if (!QFile::exists(arqiverDir_ + "/" + str))
return false;
}
}
}
return true;
}
static inline bool removeDir(const QString &dirName)
{
bool res = true;
QDir dir(dirName);
if (dir.exists()) {
const QFileInfoList infoList = dir.entryInfoList(QDir::Files | QDir::AllDirs
| QDir::NoDotAndDotDot | QDir::System | QDir::Hidden,
QDir::DirsFirst);
for (const QFileInfo& info : infoList) {
if (info.isDir())
res = removeDir(info.absoluteFilePath());
else
res = QFile::remove(info.absoluteFilePath());
if (!res) return res;
}
res = dir.rmdir(dirName);
}
return res;
}
void Backend::removeSingleExtracted(const QString& archivePath) const {
if (!arqiverDir_.isEmpty()) {
const QString filePath = arqiverDir_ + "/" + archivePath;
if (QFile::exists(filePath)) {
QFileInfo info(filePath);
if (info.isDir())
removeDir(filePath);
else
QFile::remove(filePath);
}
}
}
// Returns false only when a password is needed but it's nonempty and wrong.
bool Backend::startViewFile(const QString& path) {
if (!QFile::exists(filepath_))
return true; // "false" is reserved for password of 7z
bool res = true;
/* the path may contain newlines, which have been escaped and are restored here */
QString realPath(path);
realPath.replace(newlineExp, "\n").replace(tabExp, "\t");
QString parentDir = arqiverDir_;
if (!arqiverDir_.isEmpty()) {
QDir dir(arqiverDir_);
if (realPath.contains("/")) {
parentDir = arqiverDir_ + "/" + realPath.section("/", 0, -2);
dir.mkpath(parentDir); // also creates "dir" if needed
}
else if (!dir.exists())
dir.mkpath(arqiverDir_);
}
QString fileName = (arqiverDir_.isEmpty() ? QDateTime::currentDateTime().toString("yyyyMMddhhmmsszzz")
: parentDir + "/")
+ realPath.section("/",-1);
if (!isGzip_ && !is7z_)
fileName.replace("\\\\", "\\"); // WARNING: bsdtar escapes backslashes.
QFile file(fileName);
bool fileExists(file.exists());
if (fileExists && file.size() == static_cast<qint64>(0)) {
watcher_->removePath(fileName);
modTimes_.remove(fileName);
file.remove();
fileExists = false;
}
if (!fileExists) {
QStringList args;
if (is7z_) {
args << "-aou"; // the archive may contain files with identical names
if (encrypted_)
args << "-p" + pswrd_;
args << "x" << fileArgs_ << "-o" + arqiverDir_;
args << "-y"; // required with multiple passwords (says yes to the overwrite prompt)
args << realPath;
emit processStarting();
tmpProc_.setStandardOutputFile(QProcess::nullDevice());
tmpProc_.start("7z", args);
if (tmpProc_.waitForStarted()) {
while (!tmpProc_.waitForFinished(500))
QCoreApplication::processEvents();
}
res = tmpProc_.exitCode() == 0 || pswrd_.isEmpty();
if (!res)
pswrd_ = QString(); // avoid overwrite prompt if there are more than one password
emit processFinished(tmpProc_.exitCode() == 0, QString());
if (tmpProc_.exitCode() != 0)
return res;
}
else {
QString cmnd;
if (isGzip_) {
cmnd = "gzip";
args << "-d" << "--to-stdout" << filepath_;
emit processStarting();
tmpProc_.setStandardOutputFile(fileName);
}
else { // bsdtar
cmnd = tarCmnd_;
// "--fast-read" interferes with extraction of directories
if (isDir(path))
args << "-x" << "--no-same-owner";
else
args << "-x" << "--no-same-owner" << "--fast-read";
args << "-k" << fileArgs_
<< "--include" << escapeSpecialChars(realPath) << "-C" << arqiverDir_;
/* NOTE: The following arguments were also possible with "fileName" as the standard output
(as with Gzip) but symlinks couldn't be handled in that way. */
//args << "-x" << fileArgs_ << "--include" << escapeSpecialChars(realPath) << "--to-stdout";
emit processStarting();
tmpProc_.setStandardOutputFile(QProcess::nullDevice());
}
tmpProc_.start(cmnd, args);
if (tmpProc_.waitForStarted()) {
while (!tmpProc_.waitForFinished(500))
QCoreApplication::processEvents();
}
emit processFinished(tmpProc_.exitCode() == 0, QString());
if (tmpProc_.exitCode() != 0)
return true;
}
// handle links
if (!QFileInfo::exists(fileName)) {
errorMsg(tr("This file is a link but its target does not exist."));
return res;
}
}
else
emit processFinished(true, QString());
// Since the file may be inside a directory extracted by "extractTempFiles()",
// we may need to add it to the watch list also when it already exists.
QFileInfo info(fileName);
if (!info.isDir()) {
const QString finalTarget = info.canonicalFilePath();
if (finalTarget == fileName || finalTarget.startsWith(arqiverDir_ + QLatin1Char('/'))) {
watcher_->addPath(finalTarget);
if (!isGzip_ && !is7z_)
modTimes_.insert(finalTarget, info.lastModified());
}
}
if (QStandardPaths::findExecutable("gio").isEmpty()
|| !QProcess::startDetached("gio", QStringList() << "open" << fileName)) { // "gio" is more reliable
QDesktopServices::openUrl(QUrl::fromLocalFile(fileName));
}
return res;
}
void Backend::extractTempFiles(const QStringList& paths) {
if (!QFile::exists(filepath_)) {
emit processFinished(true, QString());
emit tempFilesExtracted(QStringList()); // needed with drag-and-drop
return;
}
QStringList realPaths(paths);
realPaths.removeAll(QString());
if (!realPaths.isEmpty()) {
realPaths.removeDuplicates();
realPaths.replaceInStrings(newlineExp, "\n").replaceInStrings(tabExp, "\t");
}
else { // should never happen in practice
emit processFinished(true, QString());
emit tempFilesExtracted(QStringList());
}
QStringList tempFileNames;
if (!arqiverDir_.isEmpty()) {
QDir dir(arqiverDir_);
if (!dir.exists())
dir.mkpath(arqiverDir_);
QList<QString>::iterator it = realPaths.begin();
while (it != realPaths.end()) {
QString realPath = *it;
if (realPath.simplified().isEmpty()) {
it = realPaths.erase(it);
continue;
}
if (realPath.startsWith("./") || realPath == ".") { // as with some rpm archives
realPath.remove(0, 2);
if (realPath.isEmpty()) {
it = realPaths.erase(it);
continue;
}
}
QString parentDir;
if (realPath.contains("/")) {
parentDir = arqiverDir_ + "/" + realPath.section("/", 0, -2);
dir.mkpath(parentDir);
}
else
parentDir = arqiverDir_; // top-level
if (!isGzip_ && !is7z_)
realPath.replace("\\\\", "\\"); // WARNING: bsdtar escapes backslashes.
QString fileName = parentDir + "/" + realPath.section("/",-1);
tempFileNames << fileName;
/* check whether it's already extracted (FIXME: this doesn't cover all symlinks) */
if (QFile::exists(fileName)
&& allChildrenExyracted(*it)) { // realPath may have changed above
it = realPaths.erase(it);
}
else ++it;
}
}
if (!realPaths.isEmpty()) {
QStringList args;
if (isGzip_) {
if (tempFileNames.size() == 1) {
args << "-d" << "--to-stdout" << filepath_;
emit processStarting();
tmpProc_.setStandardOutputFile(tempFileNames.at(0));
tmpProc_.start("gzip", args);
if (tmpProc_.waitForStarted()) {
while (!tmpProc_.waitForFinished(500))
QCoreApplication::processEvents();
}
emit processFinished(tmpProc_.exitCode() == 0, QString());
emit tempFilesExtracted(tempFileNames);
if (tmpProc_.exitCode() == 0)
watcher_->addPath(tempFileNames.at(0));
}
return;
}
if (is7z_) {
args << "-aos"; // skip extraction of existing files
if (encrypted_ )
args << "-p" + pswrd_;
args << "x" << fileArgs_ << "-o" + arqiverDir_ << "-y" << realPaths;
emit processStarting();
tmpProc_.setStandardOutputFile(QProcess::nullDevice());
tmpProc_.start("7z", args);
if (tmpProc_.waitForStarted()) {
while (!tmpProc_.waitForFinished(500))
QCoreApplication::processEvents();
}
if (tmpProc_.exitCode() != 0)
pswrd_ = QString();
}
else {
/* bsdtar */
bool noDir = true;
for (const QString &str : paths) {
if (isDir(str)) {
noDir = false;
break;
}
}
// "--fast-read" interferes with extraction of directories
if (noDir)
args << "-x" << "--no-same-owner" << "--fast-read" << "-k" << fileArgs_;
else
args << "-x" << "--no-same-owner" << "-k" << fileArgs_;
/* If a file comes after its containing folder in the command line,
bsdtar doesn't extract the folder. So, we sort the list and read it inversely. */
realPaths.sort();
int N = realPaths.length();
for (int i = 0; i < N; i++)
args << "--include" << escapeSpecialChars(realPaths[N - 1 - i]);
args << "-C" << arqiverDir_;
emit processStarting();
tmpProc_.setStandardOutputFile(QProcess::nullDevice());
tmpProc_.start(tarCmnd_, args);
if (tmpProc_.waitForStarted()) {
while (!tmpProc_.waitForFinished(500))
QCoreApplication::processEvents();
}
}
emit processFinished(tmpProc_.exitCode() == 0, QString());
emit tempFilesExtracted(tempFileNames);
if (tmpProc_.exitCode() != 0) return;
}
else { // all paths are already extracted
emit processFinished(true, QString());
emit tempFilesExtracted(tempFileNames);