runqemu: handle tap device creation failure properly

If we fail to run the command to generate the tap devices then we should
show a reasonable message and then exit, without showing a traceback.
"return 1" at this point in the code does nothing because the caller
doesn't check the return, so just use sys.exit().

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/scripts/runqemu b/scripts/runqemu
index f061917c4b3bf6f80c5e2bb2a22d443bc83bc76f..ef454d67ffde93207206d61bf812496f9bf9f8c7 100755 (executable)
--- a/scripts/runqemu
+++ b/scripts/runqemu
@@ -1121,7 +1121,11 @@ class BaseConfig(object):
             uid = os.getuid()
             logger.info("Setting up tap interface under sudo")
             cmd = ('sudo', self.qemuifup, str(uid), str(gid), self.bindir_native)
-            tap = subprocess.check_output(cmd).decode('utf-8').strip()
+            try:
+                tap = subprocess.check_output(cmd).decode('utf-8').strip()
+            except subprocess.CalledProcessError as e:
+                logger.error('Setting up tap device failed:\n%s\nRun runqemu-gen-tapdevs to manually create one.' % str(e))
+                sys.exit(1)
             lockfile = os.path.join(lockdir, tap)
             self.taplock = lockfile + '.lock'
             self.acquire_taplock()
@@ -1130,7 +1134,7 @@ class BaseConfig(object):
 
         if not tap:
             logger.error("Failed to setup tap device. Run runqemu-gen-tapdevs to manually create.")
-            return 1
+            sys.exit(1)
         self.tap = tap
         tapnum = int(tap[3:])
         gateway = tapnum * 2 + 1