Extensible SDK / devtool / recipetool improvements

index c8c79c2..9e4f1bf 100755
@@ -102,9 +102,9 @@ def publish(args):
 
     # Setting up the git repo
     if not is_remote:
-        cmd = 'set -e; mkdir -p %s/layers; cd %s/layers; if [ ! -e .git ]; then git init .; mv .git/hooks/post-update.sample .git/hooks/post-update; fi; git add -A .; git commit -q -m "init repo" || true;' % (destination, destination)
+        cmd = 'set -e; mkdir -p %s/layers; cd %s/layers; if [ ! -e .git ]; then git init .; mv .git/hooks/post-update.sample .git/hooks/post-update; fi; git add -A .; git commit -q -m "init repo" || true; git update-server-info' % (destination, destination)
     else:
-        cmd = "ssh %s 'set -e; mkdir-p %s/layers; cd %s/layers; if [ ! -e .git ]; then git init .; mv .git/hooks/post-update.sample .git/hooks/post-update; fi; git add -A .; git commit -q -m \"init repo\" || true;'" % (host, destdir, destdir)
+        cmd = "ssh %s 'set -e; mkdir-p %s/layers; cd %s/layers; if [ ! -e .git ]; then git init .; mv .git/hooks/post-update.sample .git/hooks/post-update; fi; git add -A .; git commit -q -m \"init repo\" || true; git update-server-info'" % (host, destdir, destdir)
     ret = subprocess.call(cmd, shell=True)
     if ret == 0:
         logger.info('SDK published successfully')

index c30181a..be47a77 100644
@@ -250,7 +250,7 @@ sdk_ext_postinst() {
 		# current working directory when first ran, nor will it set $1 when
 		# sourcing a script. That is why this has to look so ugly.
 		LOGFILE="$target_sdk_dir/preparing_build_system.log"
-		sh -c ". buildtools/environment-setup* > $LOGFILE && cd $target_sdk_dir/`dirname ${oe_init_build_env_path}` && set $target_sdk_dir && . $target_sdk_dir/${oe_init_build_env_path} $target_sdk_dir >> $LOGFILE && $target_sdk_dir/ext-sdk-prepare.sh $target_sdk_dir '${SDK_TARGETS}' >> $LOGFILE 2>&1" || { echo "ERROR: SDK preparation failed: see $LOGFILE"; echo "printf 'ERROR: this SDK wasn't fully installed and needs reinstalling\n'" >> $env_setup_script ; exit 1 ; }
+		sh -c ". buildtools/environment-setup* > $LOGFILE && cd $target_sdk_dir/`dirname ${oe_init_build_env_path}` && set $target_sdk_dir && . $target_sdk_dir/${oe_init_build_env_path} $target_sdk_dir >> $LOGFILE && $target_sdk_dir/ext-sdk-prepare.sh $target_sdk_dir '${SDK_TARGETS}' >> $LOGFILE 2>&1" || { echo "ERROR: SDK preparation failed: see $LOGFILE"; echo "printf 'ERROR: this SDK was not fully installed and needs reinstalling\n'" >> $env_setup_script ; exit 1 ; }
 	fi
 	rm -f $target_sdk_dir/ext-sdk-prepare.sh
 	echo done

index be47a77..317043d 100644
@@ -153,7 +153,7 @@ python copy_buildsystem () {
         f.write('CONNECTIVITY_CHECK_URIS = ""\n\n')
 
         # Ensure locked sstate cache objects are re-used without error
-        f.write('SIGGEN_LOCKEDSIGS_CHECK_LEVEL = "warn"\n\n')
+        f.write('SIGGEN_LOCKEDSIGS_CHECK_LEVEL = "none"\n\n')
 
         # Hide the config information from bitbake output (since it's fixed within the SDK)
         f.write('BUILDCFG_HEADER = ""\n')

index 47b9a7e..afe52cf 100644
@@ -86,7 +86,7 @@ def sdk_update(args, config, basepath, workspace):
         updateserver = config.get('SDK', 'updateserver', '')
     if not updateserver:
         raise DevtoolError("Update server not specified in config file, you must specify it on the command line")
-    logger.debug("updateserver: %s" % args.updateserver)
+    logger.debug("updateserver: %s" % updateserver)
 
     # Make sure we are using sdk-update from within SDK
     logger.debug("basepath = %s" % basepath)

@@ -97,35 +97,35 @@ def sdk_update(args, config, basepath, workspace):
     else:
         logger.debug("Found conf/locked-sigs.inc in %s" % basepath)
 
-    if ':' in args.updateserver:
+    if ':' in updateserver:
         is_remote = True
     else:
         is_remote = False
 
     if not is_remote:
         # devtool sdk-update /local/path/to/latest/sdk
-        new_locked_sig_file_path = os.path.join(args.updateserver, 'conf/locked-sigs.inc')
+        new_locked_sig_file_path = os.path.join(updateserver, 'conf/locked-sigs.inc')
         if not os.path.exists(new_locked_sig_file_path):
-            logger.error("%s doesn't exist or is not an extensible SDK" % args.updateserver)
+            logger.error("%s doesn't exist or is not an extensible SDK" % updateserver)
             return -1
         else:
-            logger.debug("Found conf/locked-sigs.inc in %s" % args.updateserver)
+            logger.debug("Found conf/locked-sigs.inc in %s" % updateserver)
         update_dict = generate_update_dict(new_locked_sig_file_path, old_locked_sig_file_path)
         logger.debug("update_dict = %s" % update_dict)
-        sstate_objects = get_sstate_objects(update_dict, args.updateserver)
+        sstate_objects = get_sstate_objects(update_dict, updateserver)
         logger.debug("sstate_objects = %s" % sstate_objects)
         if len(sstate_objects) == 0:
             logger.info("No need to update.")
             return 0
         logger.info("Installing sstate objects into %s", basepath)
-        install_sstate_objects(sstate_objects, args.updateserver.rstrip('/'), basepath)
+        install_sstate_objects(sstate_objects, updateserver.rstrip('/'), basepath)
         logger.info("Updating configuration files")
-        new_conf_dir = os.path.join(args.updateserver, 'conf')
+        new_conf_dir = os.path.join(updateserver, 'conf')
         old_conf_dir = os.path.join(basepath, 'conf')
         shutil.rmtree(old_conf_dir)
         shutil.copytree(new_conf_dir, old_conf_dir)
         logger.info("Updating layers")
-        new_layers_dir = os.path.join(args.updateserver, 'layers')
+        new_layers_dir = os.path.join(updateserver, 'layers')
         old_layers_dir = os.path.join(basepath, 'layers')
         shutil.rmtree(old_layers_dir)
         ret = subprocess.call("cp -a %s %s" % (new_layers_dir, old_layers_dir), shell=True)

@@ -140,12 +140,12 @@ def sdk_update(args, config, basepath, workspace):
         os.makedirs(tmpsdk_dir)
         os.makedirs(os.path.join(tmpsdk_dir, 'conf'))
         # Fetch locked-sigs.inc from update server
-        ret = subprocess.call("wget -q -O - %s/conf/locked-sigs.inc > %s/locked-sigs.inc" % (args.updateserver, os.path.join(tmpsdk_dir, 'conf')), shell=True)
+        ret = subprocess.call("wget -q -O - %s/conf/locked-sigs.inc > %s/locked-sigs.inc" % (updateserver, os.path.join(tmpsdk_dir, 'conf')), shell=True)
         if ret != 0:
-            logger.error("Fetching conf/locked-sigs.inc from %s to %s/locked-sigs.inc failed" % (args.updateserver, os.path.join(tmpsdk_dir, 'conf')))
+            logger.error("Fetching conf/locked-sigs.inc from %s to %s/locked-sigs.inc failed" % (updateserver, os.path.join(tmpsdk_dir, 'conf')))
             return ret
         else:
-            logger.info("Fetching conf/locked-sigs.inc from %s to %s/locked-sigs.inc succeeded" % (args.updateserver, os.path.join(tmpsdk_dir, 'conf')))
+            logger.info("Fetching conf/locked-sigs.inc from %s to %s/locked-sigs.inc succeeded" % (updateserver, os.path.join(tmpsdk_dir, 'conf')))
         new_locked_sig_file_path = os.path.join(tmpsdk_dir, 'conf/locked-sigs.inc')
         update_dict = generate_update_dict(new_locked_sig_file_path, old_locked_sig_file_path)
         logger.debug("update_dict = %s" % update_dict)

@@ -160,19 +160,19 @@ def sdk_update(args, config, basepath, workspace):
         else:
             ret = -1
         if ret != 0:
-            ret = subprocess.call("rm -rf layers && git clone %s/layers" % args.updateserver, shell=True)
+            ret = subprocess.call("rm -rf layers && git clone %s/layers" % updateserver, shell=True)
         if ret != 0:
             logger.error("Updating meta data via git failed")
             return ret
         logger.debug("Updating conf files ...")
         conf_files = ['local.conf', 'bblayers.conf', 'devtool.conf', 'locked-sigs.inc']
         for conf in conf_files:
-            ret = subprocess.call("wget -q -O - %s/conf/%s > conf/%s" % (args.updateserver, conf, conf), shell=True)
+            ret = subprocess.call("wget -q -O - %s/conf/%s > conf/%s" % (updateserver, conf, conf), shell=True)
             if ret != 0:
                 logger.error("Update %s failed" % conf)
                 return ret
         with open(os.path.join(basepath, 'conf/local.conf'), 'a') as f:
-            f.write('SSTATE_MIRRORS_append = " file://.* %s/sstate-cache/PATH \\n "\n' % args.updateserver)
+            f.write('SSTATE_MIRRORS_append = " file://.* %s/sstate-cache/PATH \\n "\n' % updateserver)
 
     # Run bitbake command for the whole SDK
     sdk_targets = config.get('SDK', 'sdk_targets')

index afe52cf..daa3e4e 100644
@@ -156,11 +156,11 @@ def sdk_update(args, config, basepath, workspace):
         logger.debug("Updating meta data via git ...")
         # Try using 'git pull', if failed, use 'git clone'
         if os.path.exists(os.path.join(basepath, 'layers/.git')):
-            ret = subprocess.call("cd layers && git pull", shell=True)
+            ret = subprocess.call("cd layers && git pull %s/layers/.git" % updateserver, shell=True)
         else:
             ret = -1
         if ret != 0:
-            ret = subprocess.call("rm -rf layers && git clone %s/layers" % updateserver, shell=True)
+            ret = subprocess.call("rm -rf layers && git clone %s/layers/.git" % updateserver, shell=True)
         if ret != 0:
             logger.error("Updating meta data via git failed")
             return ret

index daa3e4e..2d9d911 100644
@@ -36,14 +36,9 @@ def generate_update_dict(sigfile_new, sigfile_old):
             continue
     return update_dict
 
-def get_sstate_objects(update_dict, newsdk_path):
+def get_sstate_objects(update_dict, sstate_dir):
     """Return a list containing sstate objects which are to be installed"""
     sstate_objects = []
-    # Ensure newsdk_path points to an extensible SDK
-    sstate_dir = os.path.join(newsdk_path, 'sstate-cache')
-    if not os.path.exists(sstate_dir):
-        logger.error("sstate-cache directory not found under %s" % newsdk_path)
-        raise
     for k in update_dict:
         files = set()
         hashval = update_dict[k]

@@ -112,7 +107,11 @@ def sdk_update(args, config, basepath, workspace):
             logger.debug("Found conf/locked-sigs.inc in %s" % updateserver)
         update_dict = generate_update_dict(new_locked_sig_file_path, old_locked_sig_file_path)
         logger.debug("update_dict = %s" % update_dict)
-        sstate_objects = get_sstate_objects(update_dict, updateserver)
+        sstate_dir = os.path.join(newsdk_path, 'sstate-cache')
+        if not os.path.exists(sstate_dir):
+            logger.error("sstate-cache directory not found under %s" % newsdk_path)
+            return 1
+        sstate_objects = get_sstate_objects(update_dict, sstate_dir)
         logger.debug("sstate_objects = %s" % sstate_objects)
         if len(sstate_objects) == 0:
             logger.info("No need to update.")

index 2d9d911..7faefab 100644
@@ -173,14 +173,15 @@ def sdk_update(args, config, basepath, workspace):
         with open(os.path.join(basepath, 'conf/local.conf'), 'a') as f:
             f.write('SSTATE_MIRRORS_append = " file://.* %s/sstate-cache/PATH \\n "\n' % updateserver)
 
-    # Run bitbake command for the whole SDK
-    sdk_targets = config.get('SDK', 'sdk_targets')
-    logger.info("Executing 'bitbake %s' ... (This may take some time.)" % sdk_targets)
-    try:
-        exec_build_env_command(config.init_path, basepath, 'bitbake %s' % sdk_targets)
-    except:
-        logger.error('bitbake %s failed' % sdk_targets)
-        return -1
+    if not args.skip_prepare:
+        # Run bitbake command for the whole SDK
+        sdk_targets = config.get('SDK', 'sdk_targets')
+        logger.info("Preparing build system... (This may take some time.)")
+        try:
+            exec_build_env_command(config.init_path, basepath, 'bitbake %s' % sdk_targets)
+        except:
+            logger.error('bitbake %s failed' % sdk_targets)
+            return -1
     return 0
 
 def register_commands(subparsers, context):

@@ -188,4 +189,5 @@ def register_commands(subparsers, context):
     if context.fixed_setup:
         parser_sdk = subparsers.add_parser('sdk-update', help='Update SDK components from a nominated location')
         parser_sdk.add_argument('updateserver', help='The update server to fetch latest SDK components from', nargs='?')
+        parser_sdk.add_argument('--skip-prepare', action="store_true", help='Skip re-preparing the build system after updating (for debugging only)')
         parser_sdk.set_defaults(func=sdk_update)

index 873b7dd..f342857 100644
@@ -90,9 +90,9 @@ def determine_from_filename(srcfile):
     """Determine name and version from a filename"""
     part = ''
     if '.tar.' in srcfile:
-        namepart = srcfile.split('.tar.')[0]
+        namepart = srcfile.split('.tar.')[0].lower()
     else:
-        namepart = os.path.splitext(srcfile)[0]
+        namepart = os.path.splitext(srcfile)[0].lower()
     splitval = namepart.rsplit('_', 1)
     if len(splitval) == 1:
         splitval = namepart.rsplit('-', 1)

index f342857..775be42 100644
@@ -232,6 +232,8 @@ def create_recipe(args):
     lines_before.append('LIC_FILES_CHKSUM = "%s"' % ' \\\n                    '.join(lic_files_chksum))
     lines_before.append('')
 
+    classes = []
+
     # FIXME This is kind of a hack, we probably ought to be using bitbake to do this
     pn = None
     pv = None

@@ -249,6 +251,10 @@ def create_recipe(args):
 
     if args.name:
         pn = args.name
+        if args.name.endswith('-native'):
+            classes.append('native')
+        elif args.name.startswith('nativesdk-'):
+            classes.append('nativesdk')
 
     if pv and pv not in 'git svn hg'.split():
         realpv = pv

@@ -312,7 +318,6 @@ def create_recipe(args):
     handlers = [item[0] for item in handlers]
 
     # Apply the handlers
-    classes = []
     handled = []
 
     if args.binary:

index fbc49a9..741f0ea 100644
@@ -1196,21 +1196,24 @@ def reset(args, config, basepath, workspace):
         raise DevtoolError("Recipe must be specified, or specify -a/--all to "
                            "reset all recipes")
     if args.all:
-        recipes = workspace
+        recipes = workspace.keys()
     else:
         recipes = [args.recipename]
 
-    for pn in recipes:
-        if not args.no_clean:
-            logger.info('Cleaning sysroot for recipe %s...' % pn)
-            try:
-                exec_build_env_command(config.init_path, basepath, 'bitbake -c clean %s' % pn)
-            except bb.process.ExecutionError as e:
-                raise DevtoolError('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))
+    if recipes and not args.no_clean:
+        if len(recipes) == 1:
+            logger.info('Cleaning sysroot for recipe %s...' % recipes[0])
+        else:
+            logger.info('Cleaning sysroot for recipes %s...' % ', '.join(recipes))
+        try:
+            exec_build_env_command(config.init_path, basepath, 'bitbake -c clean %s' % ' '.join(recipes))
+        except bb.process.ExecutionError as e:
+            raise DevtoolError('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))
 
+    for pn in recipes:
         _check_preserve(config, pn)
 
         preservepath = os.path.join(config.workspace_path, 'attic', pn)

index 741f0ea..7ef0ab8 100644
@@ -139,6 +139,8 @@ def add(args, config, basepath, workspace):
         extracmdopts += ' -V %s' % args.version
     if args.binary:
         extracmdopts += ' -b'
+    if args.also_native:
+        extracmdopts += ' --also-native'
 
     tempdir = tempfile.mkdtemp(prefix='devtool')
     try:

@@ -1307,6 +1309,7 @@ def register_commands(subparsers, context):
     parser_add.add_argument('--version', '-V', help='Version to use within recipe (PV)')
     parser_add.add_argument('--no-git', '-g', help='If fetching source, do not set up source tree as a git repository', action="store_true")
     parser_add.add_argument('--binary', '-b', help='Treat the source tree as something that should be installed verbatim (no compilation, same directory structure). Useful with binary packages e.g. RPMs.', action='store_true')
+    parser_add.add_argument('--also-native', help='Also add native variant (i.e. support building recipe for the build host as well as the target machine)', action='store_true')
     parser_add.set_defaults(func=add)
 
     parser_modify = subparsers.add_parser('modify', help='Modify the source for an existing recipe',

index 775be42..4f95d7e 100644
@@ -252,8 +252,14 @@ def create_recipe(args):
     if args.name:
         pn = args.name
         if args.name.endswith('-native'):
+            if args.also_native:
+                logger.error('--also-native cannot be specified for a recipe named *-native (*-native denotes a recipe that is already only for native) - either remove the -native suffix from the name or drop --also-native')
+                sys.exit(1)
             classes.append('native')
         elif args.name.startswith('nativesdk-'):
+            if args.also_native:
+                logger.error('--also-native cannot be specified for a recipe named nativesdk-* (nativesdk-* denotes a recipe that is already only for nativesdk)')
+                sys.exit(1)
             classes.append('nativesdk')
 
     if pv and pv not in 'git svn hg'.split():

@@ -393,6 +399,22 @@ def create_recipe(args):
                 line = re.sub('"[^+]*\+', '"%s+' % realpv, line)
         lines_before.append(line)
 
+    if args.also_native:
+        lines = lines_after
+        lines_after = []
+        bbclassextend = None
+        for line in lines:
+            if line.startswith('BBCLASSEXTEND ='):
+                splitval = line.split('"')
+                if len(splitval) > 1:
+                    bbclassextend = splitval[1].split()
+                    if not 'native' in bbclassextend:
+                        bbclassextend.insert(0, 'native')
+                line = 'BBCLASSEXTEND = "%s"' % ' '.join(bbclassextend)
+            lines_after.append(line)
+        if not bbclassextend:
+            lines_after.append('BBCLASSEXTEND = "native"')
+
     outlines = []
     outlines.extend(lines_before)
     if classes:

@@ -591,5 +613,6 @@ def register_commands(subparsers):
     parser_create.add_argument('-N', '--name', help='Name to use within recipe (PN)')
     parser_create.add_argument('-V', '--version', help='Version to use within recipe (PV)')
     parser_create.add_argument('-b', '--binary', help='Treat the source tree as something that should be installed verbatim (no compilation, same directory structure)', action='store_true')
+    parser_create.add_argument('--also-native', help='Also add native variant (i.e. support building recipe for the build host as well as the target machine)', action='store_true')
     parser_create.set_defaults(func=create_recipe)
 

index bda05e1..2d57da0b 100755
@@ -112,8 +112,18 @@ def read_workspace():
                 res = externalsrc_re.match(line.rstrip())
                 if res:
                     pn = res.group(2) or os.path.splitext(os.path.basename(fn))[0].split('_')[0]
+                    # Find the recipe file within the workspace, if any
+                    bbfile = os.path.basename(fn).replace('.bbappend', '.bb').replace('%', '*')
+                    recipefile = glob.glob(os.path.join(config.workspace_path,
+                                                        'recipes',
+                                                        pn,
+                                                        bbfile))
+                    if recipefile:
+                        recipefile = recipefile[0]
                     workspace[pn] = {'srctree': res.group(3),
-                                     'bbappend': fn}
+                                     'bbappend': fn,
+                                     'recipefile': recipefile}
+                    logger.debug('Found recipe %s' % workspace[pn])
 
 def create_workspace(args, config, basepath, workspace):
     if args.layerpath:

index 7ef0ab8..e26ce5a 100644
@@ -1171,13 +1171,9 @@ def status(args, config, basepath, workspace):
     """Entry point for the devtool 'status' subcommand"""
     if workspace:
         for recipe, value in workspace.iteritems():
-            bbfile = os.path.basename(value['bbappend']).replace('.bbappend', '.bb').replace('%', '*')
-            recipefile = glob.glob(os.path.join(config.workspace_path,
-                                                'recipes',
-                                                recipe,
-                                                bbfile))
+            recipefile = value['recipefile']
             if recipefile:
-                recipestr = ' (%s)' % recipefile[0]
+                recipestr = ' (%s)' % recipefile
             else:
                 recipestr = ''
             print("%s: %s%s" % (recipe, value['srctree'], recipestr))

@@ -1261,15 +1257,8 @@ def edit_recipe(args, config, basepath, workspace):
             tinfoil.shutdown()
     else:
         check_workspace_recipe(workspace, args.recipename)
-        bbappend = workspace[args.recipename]['bbappend']
-        bbfile = os.path.basename(bbappend).replace('.bbappend', '.bb').replace('%', '*')
-        recipefile = glob.glob(os.path.join(config.workspace_path,
-                                            'recipes',
-                                            args.recipename,
-                                            bbfile))
-        if recipefile:
-            recipefile = recipefile[0]
-        else:
+        recipefile = workspace[args.recipename]['recipefile']
+        if not recipefile:
             raise DevtoolError("Recipe file for %s is not under the workspace" %
                                args.recipename)
 

index 7f16e17..253e4d5 100644
@@ -214,3 +214,27 @@ def recipe_to_append(recipefile, config, wildcard=False):
     appendpath = os.path.join(config.workspace_path, 'appends')
     appendfile = os.path.join(appendpath, appendname + '.bbappend')
     return appendfile
+
+def get_bbclassextend_targets(recipefile, pn):
+    """
+    Cheap function to get BBCLASSEXTEND and then convert that to the
+    list of targets that would result.
+    """
+    import bb.utils
+
+    values = {}
+    def get_bbclassextend_varfunc(varname, origvalue, op, newlines):
+        values[varname] = origvalue
+        return origvalue, None, 0, True
+    with open(recipefile, 'r') as f:
+        bb.utils.edit_metadata(f, ['BBCLASSEXTEND'], get_bbclassextend_varfunc)
+
+    targets = []
+    bbclassextend = values.get('BBCLASSEXTEND', '').split()
+    if bbclassextend:
+        for variant in bbclassextend:
+            if variant == 'nativesdk':
+                targets.append('%s-%s' % (variant, pn))
+            elif variant in ['native', 'cross', 'crosssdk']:
+                targets.append('%s-%s' % (pn, variant))
+    return targets

index e26ce5a..5390f51 100644
@@ -28,7 +28,7 @@ import scriptutils
 import errno
 import glob
 from collections import OrderedDict
-from devtool import exec_build_env_command, setup_tinfoil, check_workspace_recipe, use_external_build, setup_git_repo, recipe_to_append, DevtoolError
+from devtool import exec_build_env_command, setup_tinfoil, check_workspace_recipe, use_external_build, setup_git_repo, recipe_to_append, get_bbclassextend_targets, DevtoolError
 from devtool import parse_recipe
 
 logger = logging.getLogger('devtool')

@@ -1203,8 +1203,17 @@ def reset(args, config, basepath, workspace):
             logger.info('Cleaning sysroot for recipe %s...' % recipes[0])
         else:
             logger.info('Cleaning sysroot for recipes %s...' % ', '.join(recipes))
+        # If the recipe file itself was created in the workspace, and
+        # it uses BBCLASSEXTEND, then we need to also clean the other
+        # variants
+        targets = []
+        for recipe in recipes:
+            targets.append(recipe)
+            recipefile = workspace[recipe]['recipefile']
+            if recipefile:
+                targets.extend(get_bbclassextend_targets(recipefile, recipe))
         try:
-            exec_build_env_command(config.init_path, basepath, 'bitbake -c clean %s' % ' '.join(recipes))
+            exec_build_env_command(config.init_path, basepath, 'bitbake -c clean %s' % ' '.join(targets))
         except bb.process.ExecutionError as e:
             raise DevtoolError('Command \'%s\' failed, output:\n%s\nIf you '
                                 'wish, you may specify -n/--no-clean to '

index 253e4d5..0405d22 100644
@@ -146,19 +146,35 @@ def parse_recipe(config, tinfoil, pn, appends):
     return oe.recipeutils.parse_recipe(recipefile, append_files,
                                        tinfoil.config_data)
 
-def check_workspace_recipe(workspace, pn, checksrc=True):
+def check_workspace_recipe(workspace, pn, checksrc=True, bbclassextend=False):
     """
     Check that a recipe is in the workspace and (optionally) that source
     is present.
     """
-    if not pn in workspace:
+
+    workspacepn = pn
+
+    for recipe, value in workspace.iteritems():
+        if recipe == pn:
+            break
+        if bbclassextend:
+            recipefile = value['recipefile']
+            if recipefile:
+                targets = get_bbclassextend_targets(recipefile, recipe)
+                if pn in targets:
+                    workspacepn = recipe
+                    break
+    else:
         raise DevtoolError("No recipe named '%s' in your workspace" % pn)
+
     if checksrc:
-        srctree = workspace[pn]['srctree']
+        srctree = workspace[workspacepn]['srctree']
         if not os.path.exists(srctree):
-            raise DevtoolError("Source tree %s for recipe %s does not exist" % (srctree, pn))
+            raise DevtoolError("Source tree %s for recipe %s does not exist" % (srctree, workspacepn))
         if not os.listdir(srctree):
-            raise DevtoolError("Source tree %s for recipe %s is empty" % (srctree, pn))
+            raise DevtoolError("Source tree %s for recipe %s is empty" % (srctree, workspacepn))
+
+    return workspacepn
 
 def use_external_build(same_dir, no_same_dir, d):
     """

index a9a0778..c4c0c9f 100644
@@ -51,11 +51,11 @@ def _get_build_task(config):
 
 def build(args, config, basepath, workspace):
     """Entry point for the devtool 'build' subcommand"""
-    check_workspace_recipe(workspace, args.recipename)
+    workspacepn = check_workspace_recipe(workspace, args.recipename, bbclassextend=True)
 
     build_task = _get_build_task(config)
 
-    bbappend = workspace[args.recipename]['bbappend']
+    bbappend = workspace[workspacepn]['bbappend']
     if args.disable_parallel_make:
         logger.info("Disabling 'make' parallelism")
         _set_file_values(bbappend, {'PARALLEL_MAKE': ''})