validate:tools: Veryfy test manager are operationnal before using them

validate/tools/launcher/apps/ges-launch.py

@@ -176,7 +176,7 @@ class GESTestsManager(TestsManager):
 
 
     def init(self):
-        if os.system("which ges-launch") == 0:
+        if which(DEFAULT_GES_LAUNCH):
             return True
 
         return False
@@ -202,7 +202,6 @@ class GESTestsManager(TestsManager):
         projects = list()
         if not self.args:
             path = self.options.projects_paths
-            print path
             for root, dirs, files in os.walk(path):
                 for f in files:
                     if not f.endswith(".xges"):

validate/tools/launcher/apps/gst-validate.py

@@ -110,6 +110,12 @@ class GstValidateManager(TestsManager, Loggable):
         Loggable.__init__(self)
         self._uris = []
 
+    def init(self):
+        if which(DEFAULT_GST_VALIDATE) and which(DEFAULT_GST_VALIDATE_TRANSCODING):
+            return True
+
+        return False
+
     def add_options(self, group):
         group.add_option("-c", "--check-discovering", dest="check_discovering",
                          default=False, action="store_true",

validate/tools/launcher/baseclasses.py

@@ -234,6 +234,9 @@ class TestsManager(object):
         self.reporter = None
         self.wanted_tests_patterns = []
 
+    def init(self):
+        return False
+
     def list_tests(self):
         pass
 
@@ -273,8 +276,11 @@ class TestsManager(object):
                 self.reporter.after_test()
 
 
-class _TestsLauncher(object):
+class _TestsLauncher(Loggable):
     def __init__(self):
+
+        Loggable.__init__(self)
+
         self.testers = []
         self.tests = []
         self.reporter = None
@@ -299,8 +305,12 @@ class _TestsLauncher(object):
             if f.endswith(".py"):
                 execfile(os.path.join(d, "apps", f), env)
 
-        self.testers = [i() for i in get_subclasses(TestsManager, env)]
-
+        testers = [i() for i in get_subclasses(TestsManager, env)]
+        for tester in testers:
+            if tester.init() is True:
+                self.testers.append(tester)
+            else:
+                self.warning("Can not init tester: %s", tester.name)
 
     def add_options(self, parser):
         for tester in self.testers:

validate/tools/launcher/utils.py

@@ -61,6 +61,23 @@ def mkdir(directory):
         pass
 
 
+def which(name):
+    result = []
+    exts = filter(None, os.environ.get('PATHEXT', '').split(os.pathsep))
+    path = os.environ.get('PATH', None)
+    if path is None:
+        return []
+    for p in os.environ.get('PATH', '').split(os.pathsep):
+        p = os.path.join(p, name)
+        if os.access(p, os.X_OK):
+            result.append(p)
+        for e in exts:
+            pext = p + e
+            if os.access(pext, os.X_OK):
+                result.append(pext)
+    return result
+
+
 def printc(message, color="", title=False):
     if title:
         length = 0