From 77ca802522df1bcaa1c1db560dd649a5ca53419b Mon Sep 17 00:00:00 2001
From: volaya <volayaf@gmail.com>
Date: Tue, 23 Jun 2015 12:01:21 +0200
Subject: [PATCH] [processing] better initialization of SAGA provider

---
 .../algs/saga/SagaAlgorithmProvider.py        |  3 +-
 .../plugins/processing/algs/saga/SagaUtils.py | 38 ++++++++++++-------
 2 files changed, 25 insertions(+), 16 deletions(-)

diff --git a/python/plugins/processing/algs/saga/SagaAlgorithmProvider.py b/python/plugins/processing/algs/saga/SagaAlgorithmProvider.py
index b2bc3caaa6b..9d61839e31d 100644
--- a/python/plugins/processing/algs/saga/SagaAlgorithmProvider.py
+++ b/python/plugins/processing/algs/saga/SagaAlgorithmProvider.py
@@ -54,7 +54,6 @@ class SagaAlgorithmProvider(AlgorithmProvider):
         self.activate = True
 
     def initializeSettings(self):
-        AlgorithmProvider.initializeSettings(self)
         if isWindows() or isMac():
             ProcessingConfig.addSetting(Setting("SAGA",
                 SagaUtils.SAGA_FOLDER, self.tr('SAGA folder'), ''))
@@ -92,7 +91,7 @@ class SagaAlgorithmProvider(AlgorithmProvider):
             return
 
         folder = SagaUtils.sagaDescriptionPath()
-        folder = os.path.join(folder, self.supportedVersions[SagaUtils.getSagaInstalledVersion()][0])
+        folder = os.path.join(folder, self.supportedVersions[version][0])
         for descriptionFile in os.listdir(folder):
             if descriptionFile.endswith('txt'):
                 f = os.path.join(folder, descriptionFile)
diff --git a/python/plugins/processing/algs/saga/SagaUtils.py b/python/plugins/processing/algs/saga/SagaUtils.py
index df070b67d32..e46236f32de 100644
--- a/python/plugins/processing/algs/saga/SagaUtils.py
+++ b/python/plugins/processing/algs/saga/SagaUtils.py
@@ -106,16 +106,21 @@ def getSagaInstalledVersion(runSaga=False):
     global _installedVersion
     global _installedVersionFound
 
-    if not _installedVersionFound or runSaga:
-        if isWindows():
-            commands = [os.path.join(sagaPath(), "saga_cmd.exe"), "-v"]
-        elif isMac():
-            commands = [os.path.join(sagaPath(), "saga_cmd"), "-v"]
-        else:
-            # for Linux use just one string instead of separated parameters as the list
-            # does not work well together with shell=True option
-            # (python docs advices to use subprocess32 instead of python2.7's subprocess)
-            commands = ["saga_cmd -v"]
+    maxRetries = 5
+    retries = 0
+    if _installedVersionFound or not runSaga:
+        return _installedVersion
+
+    if isWindows():
+        commands = [os.path.join(sagaPath(), "saga_cmd.exe"), "-v"]
+    elif isMac():
+        commands = [os.path.join(sagaPath(), "saga_cmd -v")]
+    else:
+        # for Linux use just one string instead of separated parameters as the list
+        # does not work well together with shell=True option
+        # (python docs advices to use subprocess32 instead of python2.7's subprocess)
+        commands = ["saga_cmd -v"]
+    while retries < maxRetries:
         proc = subprocess.Popen(
             commands,
             shell=True,
@@ -126,14 +131,19 @@ def getSagaInstalledVersion(runSaga=False):
         ).stdout
         try:
             lines = proc.readlines()
+            for line in lines:
+                if line.startswith("SAGA Version:"):
+                    _installedVersion = line[len("SAGA Version:"):].strip().split(" ")[0]
+                    _installedVersionFound = True
+                    return _installedVersion
+        except IOError:
+            retries += 1
         except:
             return None
-        for line in lines:
-            if line.startswith("SAGA Version:"):
-                _installedVersion = line[len("SAGA Version:"):].strip().split(" ")[0]
-        _installedVersionFound = True
+
     return _installedVersion
 
+
 def executeSaga(progress):
     if isWindows():
         command = ['cmd.exe', '/C ', sagaBatchJobFilename()]