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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; version 2 of the License.
*
* 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 "mirall/folder.h"
#include "mirall/folderwatcher_linux.h"
#include <cerrno>
#include <QDebug>
#include <QStringList>
#include <QObject>
#include <QVarLengthArray>
namespace Mirall {
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(), SIGNAL(activated(int)), SLOT(slotReceivedNotification(int)));
} else {
qDebug() << Q_FUNC_INFO << "notify_init() failed: " << strerror(errno);
}
QMetaObject::invokeMethod(this, "slotAddFolderRecursive", Q_ARG(QString, path));
}
FolderWatcherPrivate::~FolderWatcherPrivate()
{
}
// attention: result list passed by reference!
bool FolderWatcherPrivate::findFoldersBelow( const QDir& dir, QStringList& fullList )
{
bool ok = true;
if( !(dir.exists() && dir.isReadable()) ) {
qDebug() << "Non existing path coming in: " << dir.absolutePath();
ok = false;
} else {
QStringList nameFilter;
nameFilter << QLatin1String("*");
QDir::Filters filter = QDir::Dirs | QDir::NoDotAndDotDot|QDir::NoSymLinks;
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 |
IN_DONT_FOLLOW );
if( wd > -1 ) {
_watches.insert(wd, path);
}
}
}
void FolderWatcherPrivate::slotAddFolderRecursive(const QString &path)
{
int subdirs = 0;
qDebug() << "(+) Watcher:" << path;
QDir inPath(path);
inotifyRegisterPath(inPath.absolutePath());
const QStringList watchedFolders = _watches.values();
QStringList allSubfolders;
if( !findFoldersBelow(QDir(path), allSubfolders)) {
qDebug() << "Could not traverse all sub folders";
}
// qDebug() << "currently watching " << watchedFolders;
QStringListIterator subfoldersIt(allSubfolders);
while (subfoldersIt.hasNext()) {
QString subfolder = subfoldersIt.next();
// qDebug() << " (**) subfolder: " << subfolder;
QDir folder (subfolder);
if (folder.exists() && !watchedFolders.contains(folder.absolutePath())) {
subdirs++;
if( _parent->pathIsIgnored(subfolder) ) {
qDebug() << "* Not adding" << folder.path();
continue;
}
inotifyRegisterPath(folder.absolutePath());
} else {
qDebug() << " `-> discarded:" << folder.path();
}
}
if (subdirs >0) {
qDebug() << " `-> and" << subdirs << "subdirectories";
}
}
void FolderWatcherPrivate::slotReceivedNotification(int fd)
{
int len;
struct inotify_event* event;
int i;
int error;
QVarLengthArray<char, 2048> buffer(2048);
do {
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.
*/
if (len < 0 && error == EINVAL)
{
// double the buffer size
buffer.resize(buffer.size() * 2);
/* and try again ... */
continue;
}
} while (false);
// 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];
// with the help of watch descriptor, retrieve, corresponding INotify
if (event == NULL) {
qDebug() << "NULL event";
i += sizeof(struct inotify_event);
continue;
}
// fire event
// Note: The name of the changed file and stuff could be taken from
// the event data structure. That does not happen yet.
if (event->len > 0 && event->wd > -1) {
// qDebug() << Q_FUNC_INFO << event->name;
if (QByteArray(event->name).startsWith(".csync") ||
QByteArray(event->name) == ".owncloudsync.log") {
// qDebug() << "ignore journal";
} else {
const QString p = _watches[event->wd];
_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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