wic: Make exec_cmd() error out instead of warn

The reason exec_cmd() warns but doesn't error out (broken parted)
doesn't really make sense, since the parted invocations don't even use
exec_cmd().  It really should just fail since by not doing so it's
actually enabling invalid images in some cases.

Also, since the return code is now always zero, there's no point in
having a return code, so remove it.  This represents a change in the
API, so we also need to update all callers.

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>

1 files changed, 20 insertions, 13 deletions

diff --git a/scripts/lib/mic/utils/oe/misc.py b/scripts/lib/mic/utils/oe/misc.py
index 16c250aa9f..bed275090d 100644
--- a/scripts/lib/mic/utils/oe/misc.py
+++ b/scripts/lib/mic/utils/oe/misc.py
@@ -28,13 +28,13 @@
 from mic import msger
 from mic.utils import runner
 
-def exec_cmd(cmd_and_args, as_shell = False, catch = 3):
+def __exec_cmd(cmd_and_args, as_shell = False, catch = 3):
     """
     Execute command, catching stderr, stdout
 
     Need to execute as_shell if the command uses wildcards
     """
-    msger.debug("exec_cmd: %s" % cmd_and_args)
+    msger.debug("__exec_cmd: %s" % cmd_and_args)
     args = cmd_and_args.split()
     msger.debug(args)
 
@@ -43,24 +43,31 @@ def exec_cmd(cmd_and_args, as_shell = False, catch = 3):
     else:
         rc, out = runner.runtool(args, catch)
     out = out.strip()
-    msger.debug("exec_cmd: output for %s (rc = %d): %s" % \
-                    (cmd_and_args, rc, out))
+    msger.debug("__exec_cmd: output for %s (rc = %d): %s" % \
+                (cmd_and_args, rc, out))
+
+    return (rc, out)
+
+
+def exec_cmd(cmd_and_args, as_shell = False, catch = 3):
+    """
+    Execute command, catching stderr, stdout
+
+    Exits if rc non-zero
+    """
+    rc, out = __exec_cmd(cmd_and_args, as_shell, catch)
 
     if rc != 0:
-        # We don't throw exception when return code is not 0, because
-        # parted always fails to reload part table with loop devices. This
-        # prevents us from distinguishing real errors based on return
-        # code.
-        msger.warning("WARNING: %s returned '%s' instead of 0" % (cmd_and_args, rc))
+        msger.error("exec_cmd: %s returned '%s' instead of 0" % (cmd_and_args, rc))
 
-    return (rc, out)
+    return out
 
 
 def exec_cmd_quiet(cmd_and_args, as_shell = False):
     """
     Execute command, catching nothing in the output
 
-    Need to execute as_shell if the command uses wildcards
+    Exits if rc non-zero
     """
     return exec_cmd(cmd_and_args, as_shell, 0)
 
@@ -82,7 +89,7 @@ def exec_native_cmd(cmd_and_args, native_sysroot, catch = 3):
     args = cmd_and_args.split()
     msger.debug(args)
 
-    rc, out = exec_cmd(native_cmd_and_args, True, catch)
+    rc, out = __exec_cmd(native_cmd_and_args, True, catch)
 
     if rc == 127: # shell command-not-found
         msger.error("A native (host) program required to build the image "
@@ -135,7 +142,7 @@ def find_bitbake_env_lines(image_name):
         bitbake_env_cmd = "bitbake -e %s" % image_name
     else:
         bitbake_env_cmd = "bitbake -e"
-    rc, bitbake_env_lines = exec_cmd(bitbake_env_cmd)
+    rc, bitbake_env_lines = __exec_cmd(bitbake_env_cmd)
     if rc != 0:
         print "Couldn't get '%s' output." % bitbake_env_cmd
         return None