[PATCH v2 3/3] kernel-shark: Set the configuration cache directory via env. variable

[Yordan Karadzhov <ykaradzhov@xxxxxxxxxx>]

The environment variable ${KS_USER_CONF_DIR} can be used to specify
the directory where the "Last session" configuration file will be
saved.

Suggested-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Signed-off-by: Yordan Karadzhov <ykaradzhov@xxxxxxxxxx>
---
 kernel-shark/src/KsMainWindow.cpp | 20 +++++++++++++-------
 kernel-shark/src/KsMainWindow.hpp |  2 ++
 2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/kernel-shark/src/KsMainWindow.cpp b/kernel-shark/src/KsMainWindow.cpp
index d832f3f..a92944e 100644
--- a/kernel-shark/src/KsMainWindow.cpp
+++ b/kernel-shark/src/KsMainWindow.cpp
@@ -133,9 +133,7 @@ KsMainWindow::KsMainWindow(QWidget *parent)
 KsMainWindow::~KsMainWindow()
 {
 	kshark_context *kshark_ctx(nullptr);
-	QString file = KS_CACHE_DIR;
-
-	file += "/lastsession.json";
+	QString file = lastSessionFile();
 
 	_updateSession();
 	kshark_save_config_file(file.toLocal8Bit().data(),
@@ -368,12 +366,20 @@ void KsMainWindow::_open()
 		loadDataFile(fileName);
 }
 
-void KsMainWindow::_restorSession()
+/** Get the description file of the last session. */
+QString KsMainWindow::lastSessionFile()
 {
-	QString file = KS_CACHE_DIR;
-	file += "/lastsession.json";
+	const char *file = getenv("KS_USER_CONF_DIR");
 
-	loadSession(file);
+	if (!file)
+		file = KS_CACHE_DIR;
+
+	return QString(file) +  "/lastsession.json";
+}
+
+void KsMainWindow::_restorSession()
+{
+	loadSession(lastSessionFile());
 	_graph.updateGeom();
 }
 
diff --git a/kernel-shark/src/KsMainWindow.hpp b/kernel-shark/src/KsMainWindow.hpp
index a93382a..c479520 100644
--- a/kernel-shark/src/KsMainWindow.hpp
+++ b/kernel-shark/src/KsMainWindow.hpp
@@ -37,6 +37,8 @@ public:
 
 	void loadSession(const QString &fileName);
 
+	QString lastSessionFile();
+
 	/**
 	 * @brief
 	 *
-- 
2.19.1