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Copy pathfolderwatcher_linux.cpp
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223 lines (189 loc) · 7.21 KB
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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 <cerrno>
#include <sys/inotify.h>
#include "folder.h"
#include "folderwatcher_linux.h"
#include <QObject>
#include <QStringList>
#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));
}
// attention: result list passed by reference!
bool FolderWatcherPrivate::findFoldersBelow(const QDir &dir, QStringList &fullList)
{
if (!dir.exists()) {
qCDebug(lcFolderWatcher) << " - non existing path coming in: " << dir.absolutePath();
return false;
} else if (!dir.isReadable()) {
qCDebug(lcFolderWatcher) << " - path without read permissions coming in: " << dir.absolutePath();
return false;
}
const QDir::Filters filter = QDir::Dirs | QDir::NoDotAndDotDot | QDir::NoSymLinks | QDir::Hidden;
bool ok = true;
for (const QString &path : dir.entryList({ QStringLiteral("*") }, filter)) {
const QString fullPath(dir.path() + QLatin1String("/") + path);
fullList.append(fullPath);
ok &= findFoldersBelow(QDir(fullPath), fullList);
}
return ok;
}
void FolderWatcherPrivate::inotifyRegisterPath(const QString &path)
{
if (path.isEmpty()) {
return;
}
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) {
_watchToPath.insert(wd, path);
_pathToWatch.insert(path, wd);
} 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)
{
if (_pathToWatch.contains(path)) {
return;
}
int subdirCount = 0;
qCDebug(lcFolderWatcher) << "(+) Watcher:" << path;
QDir inPath(path);
inotifyRegisterPath(inPath.absolutePath());
QStringList allSubfolders;
if (!findFoldersBelow(QDir(path), allSubfolders)) {
qCWarning(lcFolderWatcher).nospace() << "Could not traverse all sub folders of '"
<< path << "'";
}
for (const auto &subfolder : allSubfolders) {
QDir folder(subfolder);
if (folder.exists() && !_pathToWatch.contains(folder.absolutePath())) {
++subdirCount;
if (_parent->pathIsIgnored(subfolder)) {
qCDebug(lcFolderWatcher) << "* Not adding" << folder.path();
continue;
}
inotifyRegisterPath(folder.absolutePath());
} else {
qCDebug(lcFolderWatcher) << " `-> discarded:" << folder.path();
}
}
if (subdirCount > 0) {
qCDebug(lcFolderWatcher) << " `-> and" << subdirCount << "subdirectories";
}
qCDebug(lcFolderWatcher) << " --- Finished scanning" << path;
}
void FolderWatcherPrivate::slotReceivedNotification(int fd)
{
int len;
QVarLengthArray<char, 2048> buffer(2048);
forever {
len = read(fd, buffer.data(), buffer.size());
auto 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 ... */
} else {
// successful read
break;
}
}
// iterate over events in buffer
struct inotify_event *event = nullptr;
for (size_t bytePosition = 0; // start at the beginning of the buffer
bytePosition + sizeof(inotify_event) < static_cast<unsigned>(len); // check that we still have at least sizeof(inotify_event) left in the buffer
bytePosition += sizeof(inotify_event) + (event ? event->len : 0)) { // skip over the header and event-payload
// cast into an inotify_event
event = reinterpret_cast<struct inotify_event *>(&buffer[bytePosition]);
if (event == nullptr) {
qCDebug(lcFolderWatcher) << "NULL event";
continue;
}
if (event->len == 0 || event->wd <= -1) {
continue;
}
const QByteArray fileName(event->name);
// Filter out journal changes - redundant with filtering in FolderWatcher::pathIsIgnored.
if (fileName.startsWith("._sync_")
|| fileName.startsWith(".csync_journal.db")
|| fileName.startsWith(".sync_")) {
continue;
}
const QString p = _watchToPath[event->wd] + QLatin1Char('/') + QString::fromUtf8(fileName);
_parent->changeDetected(p);
if ((event->mask & (IN_MOVED_TO | IN_CREATE))
&& QFileInfo(p).isDir()
&& !_parent->pathIsIgnored(p)) {
slotAddFolderRecursive(p);
}
if (event->mask & (IN_MOVED_FROM | IN_DELETE)) {
removeFoldersBelow(p);
}
}
}
void FolderWatcherPrivate::removeFoldersBelow(const QString &path)
{
auto it = _pathToWatch.find(path);
if (it == _pathToWatch.end())
return;
const QString pathSlash = path + '/';
// Remove the entry and all subentries
while (it != _pathToWatch.end()) {
auto itPath = it.key();
if (!itPath.startsWith(path))
break;
if (itPath != path && !itPath.startsWith(pathSlash)) {
// order is 'foo', 'foo bar', 'foo/bar'
++it;
continue;
}
auto wid = it.value();
inotify_rm_watch(_fd, wid);
_watchToPath.remove(wid);
it = _pathToWatch.erase(it);
qCDebug(lcFolderWatcher) << "Removed watch for" << itPath;
}
}
} // ns mirall