[processing] fix to avoid interrupted system call exceptions in mac

Author: volaya

python/plugins/processing/algs/otb/OTBUtils.py

@@ -30,6 +30,7 @@
 
 import os
 import re
+import time
 from qgis.PyQt.QtCore import QCoreApplication
 from qgis.core import QgsApplication
 import subprocess
@@ -160,6 +161,8 @@ def executeOtb(commands, progress, addToLog=True):
     os.putenv('ITK_AUTOLOAD_PATH', otbLibPath())
     fused_command = ''.join(['"%s" ' % re.sub(r'^"|"$', '', c) for c in commands])
     proc = subprocess.Popen(fused_command, shell=True, stdout=subprocess.PIPE, stdin=open(os.devnull), stderr=subprocess.STDOUT, universal_newlines=True).stdout
+    if isMac(): #This trick avoids having an uninterrupted system call exception if OTB is not installed
+        time.sleep(1)
     for line in iter(proc.readline, ""):
         if "[*" in line:
             idx = line.find("[*")

python/plugins/processing/algs/saga/SagaUtils.py

@@ -28,6 +28,7 @@
 import os
 import stat
 import subprocess
+import time
 
 from qgis.PyQt.QtCore import QCoreApplication
 from qgis.core import QgsApplication
@@ -133,6 +134,8 @@ def getSagaInstalledVersion(runSaga=False):
             stderr=subprocess.STDOUT,
             universal_newlines=True,
         ).stdout
+        if isMac(): #This trick avoids having an uninterrupted system call exception if SAGA is not installed
+            time.sleep(1)
         try:
             lines = proc.readlines()
             for line in lines: