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/*
* Copyright (C) by Klaas Freitag <freitag@owncloud.com>
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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.
*/
#include "config.h"
#include <sys/inotify.h>
#include "folder.h"
#include "folderwatcher_linux.h"
#include <cerrno>
#include <QStringList>
#include <QObject>
#include <QVarLengthArray>
namespace OCC {
FolderWatcherPrivate::FolderWatcherPrivate(FolderWatcher *p, const QString &path)
: QObject()
, _parent(p)
, _folder(path)
{
_fd = inotify_init();
if (_fd != -1) {
_socket.reset(new QSocketNotifier(_fd, QSocketNotifier::Read));
connect(_socket.data(), &QSocketNotifier::activated, this, &FolderWatcherPrivate::slotReceivedNotification);
} else {
qCWarning(lcFolderWatcher) << "notify_init() failed: " << strerror(errno);
}
QMetaObject::invokeMethod(this, "slotAddFolderRecursive", Q_ARG(QString, path));
}
FolderWatcherPrivate::~FolderWatcherPrivate() = default;
// attention: result list passed by reference!
bool FolderWatcherPrivate::findFoldersBelow(const QDir &dir, QStringList &fullList)
{
bool ok = true;
if (!(dir.exists() && dir.isReadable())) {
qCDebug(lcFolderWatcher) << "Non existing path coming in: " << dir.absolutePath();
ok = false;
} else {
QStringList nameFilter;
nameFilter << QLatin1String("*");
QDir::Filters filter = QDir::Dirs | QDir::NoDotAndDotDot | QDir::NoSymLinks | QDir::Hidden;
const QStringList pathes = dir.entryList(nameFilter, filter);
QStringList::const_iterator constIterator;
for (constIterator = pathes.constBegin(); constIterator != pathes.constEnd();
++constIterator) {
const QString fullPath(dir.path() + QLatin1String("/") + (*constIterator));
fullList.append(fullPath);
ok = findFoldersBelow(QDir(fullPath), fullList);
}
}
return ok;
}
void FolderWatcherPrivate::inotifyRegisterPath(const QString &path)
{
if (!path.isEmpty()) {
int wd = inotify_add_watch(_fd, path.toUtf8().constData(),
IN_CLOSE_WRITE | IN_ATTRIB | IN_MOVE | IN_CREATE | IN_DELETE | IN_DELETE_SELF | IN_MOVE_SELF | IN_UNMOUNT | IN_ONLYDIR);
if (wd > -1) {
_watches.insert(wd, path);
} else {
// If we're running out of memory or inotify watches, become
// unreliable.
if (_parent->_isReliable && (errno == ENOMEM || errno == ENOSPC)) {
_parent->_isReliable = false;
emit _parent->becameUnreliable(
tr("This problem usually happens when the inotify watches are exhausted. "
"Check the FAQ for details."));
}
}
}
}
void FolderWatcherPrivate::slotAddFolderRecursive(const QString &path)
{
int subdirs = 0;
qCDebug(lcFolderWatcher) << "(+) Watcher:" << path;
QDir inPath(path);
inotifyRegisterPath(inPath.absolutePath());
const QStringList watchedFolders = _watches.values();
QStringList allSubfolders;
if (!findFoldersBelow(QDir(path), allSubfolders)) {
qCWarning(lcFolderWatcher) << "Could not traverse all sub folders";
}
QStringListIterator subfoldersIt(allSubfolders);
while (subfoldersIt.hasNext()) {
QString subfolder = subfoldersIt.next();
QDir folder(subfolder);
if (folder.exists() && !watchedFolders.contains(folder.absolutePath())) {
subdirs++;
if (_parent->pathIsIgnored(subfolder)) {
qCDebug(lcFolderWatcher) << "* Not adding" << folder.path();
continue;
}
inotifyRegisterPath(folder.absolutePath());
} else {
qCDebug(lcFolderWatcher) << " `-> discarded:" << folder.path();
}
}
if (subdirs > 0) {
qCDebug(lcFolderWatcher) << " `-> and" << subdirs << "subdirectories";
}
}
void FolderWatcherPrivate::slotReceivedNotification(int fd)
{
int len = 0;
struct inotify_event *event = nullptr;
size_t i = 0;
int error = 0;
QVarLengthArray<char, 2048> buffer(2048);
len = read(fd, buffer.data(), buffer.size());
error = errno;
/**
* From inotify documentation:
*
* The behavior when the buffer given to read(2) is too
* small to return information about the next event
* depends on the kernel version: in kernels before 2.6.21,
* read(2) returns 0; since kernel 2.6.21, read(2) fails with
* the error EINVAL.
*/
while (len < 0 && error == EINVAL) {
// double the buffer size
buffer.resize(buffer.size() * 2);
/* and try again ... */
len = read(fd, buffer.data(), buffer.size());
error = errno;
}
// reset counter
i = 0;
// while there are enough events in the buffer
while (i + sizeof(struct inotify_event) < static_cast<unsigned int>(len)) {
// cast an inotify_event
event = (struct inotify_event *)&buffer[i];
if (!event) {
qCDebug(lcFolderWatcher) << "NULL event";
i += sizeof(struct inotify_event);
continue;
}
// Fire event for the path that was changed.
if (event->len > 0 && event->wd > -1) {
QByteArray fileName(event->name);
if (fileName.startsWith("._sync_")
|| fileName.startsWith(".csync_journal.db")
|| fileName.startsWith(".owncloudsync.log")
|| fileName.startsWith(".sync_")) {
} else {
const QString p = _watches[event->wd] + '/' + fileName;
_parent->changeDetected(p);
}
}
// increment counter
i += sizeof(struct inotify_event) + event->len;
}
}
void FolderWatcherPrivate::addPath(const QString &path)
{
slotAddFolderRecursive(path);
}
void FolderWatcherPrivate::removePath(const QString &path)
{
int wid = -1;
// Remove the inotify watch.
QHash<int, QString>::const_iterator i = _watches.constBegin();
while (i != _watches.constEnd()) {
if (i.value() == path) {
wid = i.key();
break;
}
++i;
}
if (wid > -1) {
inotify_rm_watch(_fd, wid);
_watches.remove(wid);
}
}
} // ns mirall
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