devtool: fix build env command execution error handling

If we execute an external command, we ought to prepare for the
possibility that it can fail and handle the failure appropriately. We
can especially expect this to happen when running bitbake in this
scenario. Ensure we return the appropriate exit code to the calling
process.

Fixes [YOCTO #7757].

(From OE-Core rev: 98a716d79bfc5434a5b42d3ca683eab3eea30a41)

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

scripts/lib/devtool/__init__.py

@@ -44,13 +44,14 @@ def exec_build_env_command(init_path, builddir, cmd, watch=False, **options):
     if watch:
         if sys.stdout.isatty():
             # Fool bitbake into thinking it's outputting to a terminal (because it is, indirectly)
-            cmd = 'script -q -c "%s" /dev/null' % cmd
+            cmd = 'script -e -q -c "%s" /dev/null' % cmd
         return exec_watch('%s%s' % (init_prefix, cmd), **options)
     else:
         return bb.process.run('%s%s' % (init_prefix, cmd), **options)
 
 def exec_watch(cmd, **options):
     """Run program with stdout shown on sys.stdout"""
+    import bb
     if isinstance(cmd, basestring) and not "shell" in options:
         options["shell"] = True
 
@@ -67,7 +68,11 @@ def exec_watch(cmd, **options):
             buf += out
         elif out == '' and process.poll() != None:
             break
-    return buf
+
+    if process.returncode != 0:
+        raise bb.process.ExecutionError(cmd, process.returncode, buf, None)
+
+    return buf, None
 
 def setup_tinfoil():
     """Initialize tinfoil api from bitbake"""

scripts/lib/devtool/standard.py

@@ -97,8 +97,12 @@ def add(args, config, basepath, workspace):
         source = srctree
     if args.version:
         extracmdopts += ' -V %s' % args.version
-    stdout, _ = exec_build_env_command(config.init_path, basepath, 'recipetool --color=%s create -o %s "%s" %s' % (color, recipefile, source, extracmdopts))
-    logger.info('Recipe %s has been automatically created; further editing may be required to make it fully functional' % recipefile)
+    try:
+        stdout, _ = exec_build_env_command(config.init_path, basepath, 'recipetool --color=%s create -o %s "%s" %s' % (color, recipefile, source, extracmdopts))
+        logger.info('Recipe %s has been automatically created; further editing may be required to make it fully functional' % recipefile)
+    except bb.process.ExecutionError as e:
+        logger.error('Command \'%s\' failed:\n%s' % (e.command, e.stdout))
+        return 1
 
     _add_md5(config, args.recipename, recipefile)
 
@@ -688,7 +692,7 @@ def status(args, config, basepath, workspace):
 
 def reset(args, config, basepath, workspace):
     """Entry point for the devtool 'reset' subcommand"""
-    import bb.utils
+    import bb
     if args.recipename:
         if args.all:
             logger.error("Recipe cannot be specified if -a/--all is used")
@@ -708,7 +712,11 @@ def reset(args, config, basepath, workspace):
     for pn in recipes:
         if not args.no_clean:
             logger.info('Cleaning sysroot for recipe %s...' % pn)
-            exec_build_env_command(config.init_path, basepath, 'bitbake -c clean %s' % pn)
+            try:
+                exec_build_env_command(config.init_path, basepath, 'bitbake -c clean %s' % pn)
+            except bb.process.ExecutionError as e:
+                logger.error('Command \'%s\' failed, output:\n%s\nIf you wish, you may specify -n/--no-clean to skip running this command when resetting' % (e.command, e.stdout))
+                return 1
 
         _check_preserve(config, pn)
 
@@ -735,7 +743,11 @@ def build(args, config, basepath, workspace):
         logger.error("no recipe named %s in your workspace" % args.recipename)
         return -1
     build_task = config.get('Build', 'build_task', 'populate_sysroot')
-    exec_build_env_command(config.init_path, basepath, 'bitbake -c %s %s' % (build_task, args.recipename), watch=True)
+    try:
+        exec_build_env_command(config.init_path, basepath, 'bitbake -c %s %s' % (build_task, args.recipename), watch=True)
+    except bb.process.ExecutionError as e:
+        # We've already seen the output since watch=True, so just ensure we return something to the user
+        return e.exitcode
 
     return 0