wic: raise WicError in core modules

Replaced sys.exit with raising WicError in the core wic modules.

(From OE-Core rev: 1b11437fb25ece5b3eede52344b071e875fa738f)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/wic/utils/misc.py

@@ -33,6 +33,7 @@ import re
 from collections import defaultdict
 from distutils import spawn
 
+from wic.errors import WicError
 from wic.utils import runner
 
 logger = logging.getLogger('wic')
@@ -74,9 +75,8 @@ def _exec_cmd(cmd_and_args, as_shell=False, catch=3):
         ret, out = runner.runtool(args, catch)
     out = out.strip()
     if ret != 0:
-        logger.error("_exec_cmd: %s returned '%s' instead of 0\noutput: %s" % \
-                    (cmd_and_args, ret, out))
-        sys.exit(1)
+        raise WicError("_exec_cmd: %s returned '%s' instead of 0\noutput: %s" % \
+                       (cmd_and_args, ret, out))
 
     logger.debug("_exec_cmd: output for %s (rc = %d): %s",
                  cmd_and_args, ret, out)

scripts/lib/wic/utils/runner.py

@@ -18,7 +18,8 @@
 import logging
 import os
 import subprocess
-import sys
+
+from wic.errors import WicError
 
 logger = logging.getLogger('wic')
 
@@ -72,8 +73,7 @@ def runtool(cmdln_or_args, catch=1):
     except OSError as err:
         if err.errno == 2:
             # [Errno 2] No such file or directory
-            logger.error('Cannot run command: %s, lost dependency?', cmd)
-            sys.exit(1)
+            raise WicError('Cannot run command: %s, lost dependency?' % cmd)
         else:
             raise # relay
     finally: