scripts: Fix return value checks from subprocess.call()'s

Python function subprocess.call() returns the return value of the
executed process. If return values are not checked, errors may
go unnoticed and bad things can happen.

Change all callers of subprocess.call() which do not check for
the return value to use subprocess.check_call() which raises
CalledProcessError if the subprocess returns with non-zero value.

https://docs.python.org/2/library/subprocess.html#using-the-subprocess-module

All users of the function were found with:

$ git grep "subprocess\.call" | \
  egrep -v 'if.*subprocess\.call|=\ +subprocess\.call|return.*subprocess\.call'

Tested similar patch on top of yocto jethro. Only compile tested
core-image-minimal on poky master branch.

Signed-off-by: Mikko Rapeli <mikko.rapeli@bmw.de>
Signed-off-by: Ross Burton <ross.burton@intel.com>

diff --git a/scripts/runqemu b/scripts/runqemu
index 0039b8359e073ce85cdb08163cd85dc25e1e1358..311fbebdf47441837205eec8fdd6924346a33657 100755 (executable)
--- a/scripts/runqemu
+++ b/scripts/runqemu
@@ -1098,7 +1098,7 @@ class BaseConfig(object):
         if self.serialstdio:
             logger.info("Interrupt character is '^]'")
             cmd = "stty intr ^]"
-            subprocess.call(cmd, shell=True)
+            subprocess.check_call(cmd, shell=True)
 
             first_serial = ""
             if not re.search("-nographic", self.qemu_opt):
@@ -1146,7 +1146,7 @@ class BaseConfig(object):
         if self.cleantap:
             cmd = 'sudo %s %s %s' % (self.qemuifdown, self.tap, self.bindir_native)
             logger.info('Running %s' % cmd)
-            subprocess.call(cmd, shell=True)
+            subprocess.check_call(cmd, shell=True)
         if self.lock_descriptor:
             logger.info("Releasing lockfile for tap device '%s'" % self.tap)
             self.release_lock()
@@ -1155,11 +1155,11 @@ class BaseConfig(object):
             logger.info("Shutting down the userspace NFS server...")
             cmd = "runqemu-export-rootfs stop %s" % self.rootfs
             logger.info('Running %s' % cmd)
-            subprocess.call(cmd, shell=True)
+            subprocess.check_call(cmd, shell=True)
 
         if self.saved_stty:
             cmd = "stty %s" % self.saved_stty
-            subprocess.call(cmd, shell=True)
+            subprocess.check_call(cmd, shell=True)
 
         if self.clean_nfs_dir:
             logger.info('Removing %s' % self.rootfs)