From 9d76cb942d54c5e8edec59d90644326219b1c4a0 Mon Sep 17 00:00:00 2001
From: Timothy Pearson <kb9vqf@pearsoncomputing.net>
Date: Mon, 26 Aug 2013 10:32:41 -0500
Subject: Disable suspend/hibernate if $HOME is a network file system This
 resolves Bug 1615

---
 tdecore/tdehw/tderootsystemdevice.cpp | 32 +++++++++++++++++++++
 tdecore/tdehw/tdestoragedevice.cpp    | 54 +++++++++++++++++++++++++++++++++++
 tdecore/tdehw/tdestoragedevice.h      |  7 +++++
 3 files changed, 93 insertions(+)

(limited to 'tdecore')

diff --git a/tdecore/tdehw/tderootsystemdevice.cpp b/tdecore/tdehw/tderootsystemdevice.cpp
index 86a92340c..3f12b4d5a 100644
--- a/tdecore/tdehw/tderootsystemdevice.cpp
+++ b/tdecore/tdehw/tderootsystemdevice.cpp
@@ -18,6 +18,7 @@
 */
 
 #include "tderootsystemdevice.h"
+#include "tdestoragedevice.h"
 
 #include <unistd.h>
 
@@ -27,6 +28,7 @@
 #include "tdeglobal.h"
 #include "tdeconfig.h"
 #include "tdeapplication.h"
+#include "kstandarddirs.h"
 
 #include "config.h"
 
@@ -38,6 +40,16 @@
 	#include <tqdbusconnection.h>
 #endif // defined(WITH_TDEHWLIB_DAEMONS) || defined(WITH_UPOWER) || defined(WITH_DEVKITPOWER) || defined(WITH_HAL) || defined(WITH_CONSOLEKIT)
 
+bool isNetworkFileSystem(TQString fileSystemType) {
+	if ((fileSystemType.startsWith("nfs"))
+		|| (fileSystemType == "cifs")
+		) {
+		return TRUE;
+	}
+
+	return FALSE;
+}
+
 TDERootSystemDevice::TDERootSystemDevice(TDEGenericDeviceType::TDEGenericDeviceType dt, TQString dn) : TDEGenericDevice(dt, dn) {
 	m_hibernationSpace = -1;
 }
@@ -97,6 +109,12 @@ bool TDERootSystemDevice::canSetHibernationMethod() {
 }
 
 bool TDERootSystemDevice::canStandby() {
+	// Network file systems mounted on $HOME typically cause nasty suspend/resume failures
+	// See Bug 1615 for details
+	if (isNetworkFileSystem(TDEStorageDevice::determineFileSystemType(TDEGlobal::dirs()->localtdedir()))) {
+		return FALSE;
+	}
+
 	TQString statenode = "/sys/power/state";
 	int rval = access (statenode.ascii(), W_OK);
 	if (rval == 0) {
@@ -125,9 +143,17 @@ bool TDERootSystemDevice::canStandby() {
 		}
 	}
 #endif // WITH_TDEHWLIB_DAEMONS
+
+	return FALSE;
 }
 
 bool TDERootSystemDevice::canSuspend() {
+	// Network file systems mounted on $HOME typically cause nasty suspend/resume failures
+	// See Bug 1615 for details
+	if (isNetworkFileSystem(TDEStorageDevice::determineFileSystemType(TDEGlobal::dirs()->localtdedir()))) {
+		return FALSE;
+	}
+
 	TQString statenode = "/sys/power/state";
 	int rval = access (statenode.ascii(), W_OK);
 	if (rval == 0) {
@@ -223,6 +249,12 @@ bool TDERootSystemDevice::canSuspend() {
 }
 
 bool TDERootSystemDevice::canHibernate() {
+	// Network file systems mounted on $HOME typically cause nasty suspend/resume failures
+	// See Bug 1615 for details
+	if (isNetworkFileSystem(TDEStorageDevice::determineFileSystemType(TDEGlobal::dirs()->localtdedir()))) {
+		return FALSE;
+	}
+
 	TQString statenode = "/sys/power/state";
 	int rval = access (statenode.ascii(), W_OK);
 	if (rval == 0) {
diff --git a/tdecore/tdehw/tdestoragedevice.cpp b/tdecore/tdehw/tdestoragedevice.cpp
index f13146b00..3824f488e 100644
--- a/tdecore/tdehw/tdestoragedevice.cpp
+++ b/tdecore/tdehw/tdestoragedevice.cpp
@@ -21,6 +21,7 @@
 
 #include <unistd.h>
 #include <fcntl.h>
+#include <sys/stat.h>
 #include <sys/ioctl.h>
 #include <linux/cdrom.h>
 
@@ -769,4 +770,57 @@ bool TDEStorageDevice::unmountDevice(TQString* errRet, int* retcode) {
 	return false;
 }
 
+TQString TDEStorageDevice::determineFileSystemType(TQString path) {
+	TQStringList mountTable;
+	TQString prevPath = path;
+	dev_t prevDev = 0;
+	int pos;
+	struct stat directory_info;
+	if (path.startsWith("/")) {
+		stat(path.ascii(), &directory_info);
+		prevDev = directory_info.st_dev;
+		// Walk the directory tree up to the root, checking for any change in st_dev
+		// If a change is found, the previous value of path is the mount point itself
+		while (path != "/") {
+			pos = path.findRev("/", -1, TRUE);
+			if (pos < 0) {
+				break;
+			}
+			path = path.mid(0, pos);
+			if (path == "") {
+				path = "/";
+			}
+			stat(path.ascii(), &directory_info);
+			if (directory_info.st_dev != prevDev) {
+				break;
+			}
+			prevPath = path;
+			prevDev = directory_info.st_dev;
+		}
+	}
+
+	// Read in mount table
+	mountTable.clear();
+	TQFile file( "/proc/mounts" );
+	if ( file.open( IO_ReadOnly ) ) {
+		TQTextStream stream( &file );
+		while ( !stream.atEnd() ) {
+			mountTable.append(stream.readLine());
+		}
+		file.close();
+	}
+
+	// Parse mount table
+	TQStringList::Iterator it;
+	for ( it = mountTable.begin(); it != mountTable.end(); ++it ) {
+		TQStringList mountInfo = TQStringList::split(" ", (*it), true);
+		if ((*mountInfo.at(1)) == prevPath) {
+			return (*mountInfo.at(2));
+		}
+	}
+
+	// Unknown file system type
+	return TQString::null;
+}
+
 #include "tdestoragedevice.moc"
diff --git a/tdecore/tdehw/tdestoragedevice.h b/tdecore/tdehw/tdestoragedevice.h
index 6e6270f9e..1199510a4 100644
--- a/tdecore/tdehw/tdestoragedevice.h
+++ b/tdecore/tdehw/tdestoragedevice.h
@@ -290,6 +290,13 @@ class TDECORE_EXPORT TDEStorageDevice : public TDEGenericDevice
 		*/
 		bool ejectDrive();
 
+		/**
+		* @param path Full path to arbitrary file or directory
+		* @return TQString with type of file system containing the given file,
+		* or TQString::null if file system type unknown
+		*/
+		static TQString determineFileSystemType(TQString path);
+
 	protected:
 		/**
 		* @param a TQString with the disk or partition label, if any
-- 
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