run: Improve reporting on setup error

In case '7za' is missing, we better report to the user
straight away, rather than just failing silently.
Also, we want to avoid as much as possible config
files not in their right places.

In order to accomplish that goal, check for 7za's
presence in the system on virt_test_assistant, and
throw an exception if it's not present. Also,
make sure we catch exceptions when calling
virt_test_assistant, to present error information
in a good way.
Signed-off-by: NLucas Meneghel Rodrigues <lmr@redhat.com>

kvm/get_started.py

@@ -4,7 +4,7 @@ Program to help setup kvm test environment
 
 @copyright: Red Hat 2010
 """
-import os, sys
+import os, sys, logging
 try:
     import autotest.common as common
 except ImportError:
@@ -20,6 +20,9 @@ check_modules = ["kvm", "kvm-%s" % utils_misc.get_cpu_vendor(verbose=False)]
 online_docs_url = "https://github.com/autotest/autotest/wiki/KVMAutotest-GetStartedClient"
 
 if __name__ == "__main__":
-    utils_misc.virt_test_assistant(test_name, test_dir, base_dir,
-                                   default_userspace_paths, check_modules,
-                                   online_docs_url)
+    try:
+        utils_misc.virt_test_assistant(test_name, test_dir, base_dir,
+                                       default_userspace_paths, check_modules,
+                                       online_docs_url)
+    except Exception, details:
+        logging.error("Setup error: %s", details)