[PATCH V2 0/7] Extensible SDK fixesExtensible SDK fixes

[PATCH V2 0/7] Extensible SDK fixesExtensible SDK fixes

[Chen Qi]

The following changes since commit c38acd720b3f6ffbeb544063692eb471dada8593:

  binconfig-disabled: write an message to stderr to help confused developers (2015-08-19 17:57:58 +0100)

are available in the git repository at:

  git://git.openembedded.org/openembedded-core-contrib ChenQi/sdktool
  http://cgit.openembedded.org/cgit.cgi/openembedded-core-contrib/log/?h=ChenQi/sdktool

Chen Qi (7):
  copy_buildsystem: make sure bitbake directory is copied
  populate_sdk_ext: consider custom configuration in local.conf
  populate_sdk_ext: don't remove the native qemu dependencies
  Extensible SDK: allow for installation without preparing build system
  oe-publish-sdk: add script
  populate_sdk_ext: record SDK_TARGETS in devtool.conf
  devtool: add sdk.py plugin

 meta/classes/populate_sdk_ext.bbclass |  42 +++++---
 meta/files/toolchain-shar-extract.sh  |   7 +-
 meta/lib/oe/copy_buildsystem.py       |   7 +-
 scripts/lib/devtool/sdk.py            | 188 ++++++++++++++++++++++++++++++++++
 scripts/oe-publish-sdk                | 143 ++++++++++++++++++++++++++
 5 files changed, 369 insertions(+), 18 deletions(-)
 create mode 100644 scripts/lib/devtool/sdk.py
 create mode 100755 scripts/oe-publish-sdk

-- 
1.9.1

[PATCH V2 1/7] copy_buildsystem: make sure bitbake directory is copied

[Chen Qi]

The previous code assumes that bitbake/ directory is under the core layer.
This is the case for Yocto project. But users might clone oe-core and bitbake
separately. So we use bb.__file__ to locate the bitbake directory to make sure
it's copied into the extensible SDK.

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
---
 meta/lib/oe/copy_buildsystem.py | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/meta/lib/oe/copy_buildsystem.py b/meta/lib/oe/copy_buildsystem.py
index cf7fada..979578c 100644
--- a/meta/lib/oe/copy_buildsystem.py
+++ b/meta/lib/oe/copy_buildsystem.py
@@ -28,11 +28,10 @@ class BuildSystem(object):
         layers.append(corebase)
 
         corebase_files = self.d.getVar('COREBASE_FILES', True).split()
-
-        # bitbake belongs in corebase so make sure it goes there
-        if "bitbake" not in corebase_files:
-            corebase_files.append("bitbake")
         corebase_files = [corebase + '/' +x for x in corebase_files]
+        # Make sure bitbake goes in
+        bitbake_dir = bb.__file__.rsplit('/', 3)[0]
+        corebase_files.append(bitbake_dir)
 
         for layer in layers:
             layerconf = os.path.join(layer, 'conf', 'layer.conf')
-- 
1.9.1

[PATCH V2 2/7] populate_sdk_ext: consider custom configuration in local.conf

[Chen Qi]

Copy the contents of local.conf under TOPDIR into the final generated
local.conf. In this way, custom settings are also made into the final
local.conf like IMAGE_INSTALL, DISTRO_FEATURES, VIRTUAL-RUNTIME_xxx, etc.

Before this change, installing extensible SDK would usually report failure
when preparing the build system if the user has custom configuration for
DISTRO_FEATURES in local.conf. Also, items in IMAGE_INSTALL_append in local.conf
also don't get built correctly.

This patch solves the above problem by making use of the bb.utils.edit_metadata.

In addition, we check to avoid any setting that might lead to host path
bleeding into SDK's configuration. Basically, variables with values starting
with '/' are removed. A whitelist mechanism is introduced so that users could
specify variables that should not be ignored. The name of the whitelist is
SDK_LOCAL_CONF_WHITELIST.

The SDK_META_CONF_WHITELIST is removed as it's of no use after this change.

Add SDK_INHERIT_BLACKLIST to forbit local.conf in SDK to herit certain classes
like 'buildhistory' or 'icecc'.

[YOCTO #7616]

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
---
 meta/classes/populate_sdk_ext.bbclass | 23 ++++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/meta/classes/populate_sdk_ext.bbclass b/meta/classes/populate_sdk_ext.bbclass
index a36bf16..da5ec2c 100644
--- a/meta/classes/populate_sdk_ext.bbclass
+++ b/meta/classes/populate_sdk_ext.bbclass
@@ -15,7 +15,8 @@ SDK_RDEPENDS_append_task-populate-sdk-ext = " ${SDK_TARGETS}"
 
 SDK_RELOCATE_AFTER_INSTALL_task-populate-sdk-ext = "0"
 
-SDK_META_CONF_WHITELIST ?= "MACHINE DISTRO PACKAGE_CLASSES"
+SDK_LOCAL_CONF_WHITELIST ?= ""
+SDK_INHERIT_BLACKLIST ?= "buildhistory icecc"
 
 SDK_TARGETS ?= "${PN}"
 OE_INIT_ENV_SCRIPT ?= "oe-init-build-env"
@@ -109,15 +110,33 @@ python copy_buildsystem () {
         f.write('    "\n')
 
     # Create local.conf
+    local_conf_whitelist = d.getVar('SDK_LOCAL_CONF_WHITELIST', True).split()
+    def handle_var(varname, origvalue, op, newlines):
+        if origvalue.strip().startswith('/') and not varname in local_conf_whitelist:
+            newlines.append('# Removed original setting of %s\n' % varname)
+            return None, op, 0, True
+        else:
+            return origvalue, op, 0, True
+    varlist = ['[^#=+ ]*']
+    builddir = d.getVar('TOPDIR', True)
+    with open(builddir + '/conf/local.conf', 'r') as f:
+        oldlines = f.readlines()
+    (updated, newlines) = bb.utils.edit_metadata(oldlines, varlist, handle_var)
+
     with open(baseoutpath + '/conf/local.conf', 'w') as f:
         f.write('# WARNING: this configuration has been automatically generated and in\n')
         f.write('# most cases should not be edited. If you need more flexibility than\n')
         f.write('# this configuration provides, it is strongly suggested that you set\n')
         f.write('# up a proper instance of the full build system and use that instead.\n\n')
+        for line in newlines:
+            f.write(line)
 
         f.write('INHERIT += "%s"\n\n' % 'uninative')
         f.write('CONF_VERSION = "%s"\n\n' % d.getVar('CONF_VERSION', False))
 
+        # Some classes are not suitable for SDK, remove them from INHERIT
+        f.write('INHERIT_remove = "%s"\n' % d.getVar('SDK_INHERIT_BLACKLIST'))
+    
         # This is a bit of a hack, but we really don't want these dependencies
         # (we're including them in the SDK as nativesdk- versions instead)
         f.write('POKYQEMUDEPS_forcevariable = ""\n\n')
@@ -134,8 +153,6 @@ python copy_buildsystem () {
         # Ensure locked sstate cache objects are re-used without error
         f.write('SIGGEN_LOCKEDSIGS_CHECK_LEVEL = "warn"\n\n')
 
-        for varname in d.getVar('SDK_META_CONF_WHITELIST', True).split():
-            f.write('%s = "%s"\n' % (varname, d.getVar(varname, True)))
         f.write('require conf/locked-sigs.inc\n')
         f.write('require conf/work-config.inc\n')
 
-- 
1.9.1

[PATCH V2 3/7] populate_sdk_ext: don't remove the native qemu dependencies

[Chen Qi]

These dependencies were deliberately removed because it was assumed that
they were provided by nativesdk packages. On the one hand, nativesdk packages
in extensible SDK don't have these packages; on the other hand, even if we
add these nativesdk packages, they are still not useful because we we need
runqemu to run correctly.

So we don't remove these native qemu dependencies.

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
---
 meta/classes/populate_sdk_ext.bbclass | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/meta/classes/populate_sdk_ext.bbclass b/meta/classes/populate_sdk_ext.bbclass
index da5ec2c..df87edb 100644
--- a/meta/classes/populate_sdk_ext.bbclass
+++ b/meta/classes/populate_sdk_ext.bbclass
@@ -137,11 +137,6 @@ python copy_buildsystem () {
         # Some classes are not suitable for SDK, remove them from INHERIT
         f.write('INHERIT_remove = "%s"\n' % d.getVar('SDK_INHERIT_BLACKLIST'))
     
-        # This is a bit of a hack, but we really don't want these dependencies
-        # (we're including them in the SDK as nativesdk- versions instead)
-        f.write('POKYQEMUDEPS_forcevariable = ""\n\n')
-        f.write('EXTRA_IMAGEDEPENDS_remove = "qemu-native qemu-helper-native"\n\n')
-
         # Bypass the default connectivity check if any
         f.write('CONNECTIVITY_CHECK_URIS = ""\n\n')
 
-- 
1.9.1

[PATCH V2 4/7] Extensible SDK: allow for installation without preparing build system

[Chen Qi]

When publishing SDK, what we want is basically its metadata and sstate
cache objects. We don't want the SDK to be prepared with running bitbake
as it takes time which reproduces meaningless output for the published SDK.

So this patch adds an option to allow for SDK to be extracted without
preparing the build system.

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
---
 meta/classes/populate_sdk_ext.bbclass | 12 +++++++-----
 meta/files/toolchain-shar-extract.sh  |  7 ++++++-
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/meta/classes/populate_sdk_ext.bbclass b/meta/classes/populate_sdk_ext.bbclass
index df87edb..d2ebcef 100644
--- a/meta/classes/populate_sdk_ext.bbclass
+++ b/meta/classes/populate_sdk_ext.bbclass
@@ -217,11 +217,13 @@ sdk_ext_postinst() {
 	# For now this is where uninative.bbclass expects the tarball
 	mv *-nativesdk-libc.tar.* $target_sdk_dir/`dirname ${oe_init_build_env_path}`
 
-	printf "Preparing build system...\n"
-	# dash which is /bin/sh on Ubuntu will not preserve the
-	# current working directory when first ran, nor will it set $1 when
-	# sourcing a script. That is why this has to look so ugly.
-	sh -c ". buildtools/environment-setup* > preparing_build_system.log && 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 >> preparing_build_system.log && bitbake ${SDK_TARGETS} >> preparing_build_system.log" || { echo "SDK preparation failed: see `pwd`/preparing_build_system.log" ; exit 1 ; }
+	if [ "$prepare_buildsystem" != "no" ]; then
+	    printf "Preparing build system...\n"
+	    # dash which is /bin/sh on Ubuntu will not preserve the
+	    # current working directory when first ran, nor will it set $1 when
+	    # sourcing a script. That is why this has to look so ugly.
+	    sh -c ". buildtools/environment-setup* > preparing_build_system.log && 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 >> preparing_build_system.log && bitbake ${SDK_TARGETS} >> preparing_build_system.log" || { echo "SDK preparation failed: see `pwd`/preparing_build_system.log" ; exit 1 ; }
+	fi
 	echo done
 }
 
diff --git a/meta/files/toolchain-shar-extract.sh b/meta/files/toolchain-shar-extract.sh
index 3a50991..23cb69a 100644
--- a/meta/files/toolchain-shar-extract.sh
+++ b/meta/files/toolchain-shar-extract.sh
@@ -32,7 +32,7 @@ answer=""
 relocate=1
 savescripts=0
 verbose=0
-while getopts ":yd:DRS" OPT; do
+while getopts ":yd:nDRS" OPT; do
 	case $OPT in
 	y)
 		answer="Y"
@@ -41,6 +41,9 @@ while getopts ":yd:DRS" OPT; do
 	d)
 		target_sdk_dir=$OPTARG
 		;;
+	n)
+		prepare_buildsystem="no"
+		;;
 	D)
 		verbose=1
 		;;
@@ -55,6 +58,8 @@ while getopts ":yd:DRS" OPT; do
 		echo "Usage: $(basename $0) [-y] [-d <dir>]"
 		echo "  -y         Automatic yes to all prompts"
 		echo "  -d <dir>   Install the SDK to <dir>"
+		echo "======== Extensible SDK only options ============"
+		echo "  -n         Do not prepare the build system"
 		echo "======== Advanced DEBUGGING ONLY OPTIONS ========"
 		echo "  -S         Save relocation scripts"
 		echo "  -R         Do not relocate executables"
-- 
1.9.1

[PATCH V2 5/7] oe-publish-sdk: add script

[Chen Qi]

Add a script to publish extensible SDK to a specified destination.

e.g.
oe-publish-sdk <ext-sdk> <destination>

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
---
 scripts/oe-publish-sdk | 143 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100755 scripts/oe-publish-sdk

diff --git a/scripts/oe-publish-sdk b/scripts/oe-publish-sdk
new file mode 100755
index 0000000..21d4d52
--- /dev/null
+++ b/scripts/oe-publish-sdk
@@ -0,0 +1,143 @@
+#!/usr/bin/env python
+
+# OpenEmbedded SDK Tool
+
+# oe-publish-sdk publish <ext-sdk> <destination>
+# <ext-sdk>: extensible SDK to publish
+# <destination>: local or remote location which servers as an SDK update server
+# e.g.
+# oe-publish-sdk publish sdk-ext.sh /mnt/poky/sdk-ext
+# oe-publish-sdk publish sdk-ext.sh user@host:/opt/poky/sdk-ext
+#
+
+import sys
+import os
+import argparse
+import glob
+import re
+import subprocess
+import logging
+import shutil
+import errno
+
+scripts_path = os.path.dirname(os.path.realpath(__file__))
+lib_path = scripts_path + '/lib'
+sys.path = sys.path + [lib_path]
+import scriptutils
+logger = scriptutils.logger_create('sdktool')
+
+def mkdir(d):
+    try:
+        os.makedirs(d)
+    except OSError as e:
+        if e.errno != errno.EEXIST:
+            raise e
+
+def publish(args):
+    logger.debug("In publish function")
+    target_sdk = args.sdk
+    destination = args.dest
+    logger.debug("target_sdk = %s, update_server = %s" % (target_sdk, destination))
+    sdk_basename = os.path.basename(target_sdk)
+
+    # Ensure the SDK exists
+    if not os.path.exists(target_sdk):
+        logger.error("%s doesn't exist" % target_sdk)
+        return -1
+    
+    if ':' in destination:
+        is_remote = True
+        host, destdir = destination.split(':')
+        dest_sdk = os.path.join(destdir, sdk_basename)
+    else:
+        is_remote = False
+        dest_sdk = os.path.join(destination, sdk_basename)
+        
+    # Making sure the directory exists
+    logger.debug("Making sure the destination directory exists")
+    if not is_remote:
+        mkdir(destination)
+    else:
+        cmd = "ssh %s 'mkdir -p %s'" % (host, destdir)
+        ret = subprocess.call(cmd, shell=True)
+        if ret != 0:
+            logger.error("Making directory %s on %s failed" % (destdir, host))
+            return ret
+        
+    # Copying the SDK to the destination
+    logger.debug("Copying the SDK to destination")
+    if not is_remote:
+        if os.path.exists(dest_sdk):
+            os.remove(dest_sdk)
+        if (os.stat(target_sdk).st_dev == os.stat(destination).st_dev):
+            os.link(target_sdk, dest_sdk)
+        else:
+            shutil.copy(target_sdk, dest_sdk)
+    else:
+        cmd = "scp %s %s" % (target_sdk, destination)
+        ret = subprocess.call(cmd, shell=True)
+        if ret != 0:
+            logger.error("scp %s %s failed" % (target_sdk, destination))
+            return ret
+    
+    # Unpack the SDK
+    logger.debug("Unpacking SDK")
+    if not is_remote:
+        cmd = "sh %s -n -y -d %s" % (dest_sdk, destination)
+        ret = subprocess.call(cmd, shell=True)
+        if ret == 0:
+            logger.info('Successfully unpacked %s to %s' % (dest_sdk, destination))
+        else:
+            logger.error('Failed to unpack %s to %s' % (dest_sdk, destination))
+            return ret
+    else:
+        cmd = "ssh %s 'sh %s -n -y -d %s'" % (host, dest_sdk, destdir)
+        ret = subprocess.call(cmd, shell=True)
+        if ret == 0:
+            logger.info('Successfully unpacked %s to %s' % (dest_sdk, destdir))
+        else:
+            logger.error('Failed to unpack %s to %s' % (dest_sdk, destdir))
+            return ret
+
+    # Setting up the git repo
+    if not is_remote:
+        cmd = 'cd %s/layers; if [ ! -e .git ]; then git init .; mv .git/hooks/post-update.sample .git/hooks/post-update; fi; git add .; git commit -m "init repo" || true;' % destination
+    else:
+        cmd = "ssh %s 'cd %s/layers; if [ ! -e .git ]; then git init .; mv .git/hooks/post-update.sample .git/hooks/post-update; fi; git add .; git commit -m \"init repo\" || true;'" % (host, destdir)
+    ret = subprocess.call(cmd, shell=True)
+    if ret == 0:
+        logger.info('Git repo set up successfully')
+    else:
+        logger.error('Failed to set up git repo')
+    return ret
+
+
+def main():
+    parser = argparse.ArgumentParser(description="OpenEmbedded development tool",
+                                     epilog="Use %(prog)s <subcommand> --help to get help on a specific command")
+    parser.add_argument('-d', '--debug', help='Enable debug output', action='store_true')
+    parser.add_argument('-q', '--quiet', help='Print only errors', action='store_true')
+
+    parser.add_argument('sdk', help='Extensible SDK to publish')
+    parser.add_argument('dest', help='Destination to publish SDK to')
+    
+    parser.set_defaults(func=publish)
+
+    args = parser.parse_args()
+
+    if args.debug:
+        logger.setLevel(logging.DEBUG)
+    elif args.quiet:
+        logger.setLevel(logging.ERROR)
+
+    ret = args.func(args)
+    return ret
+
+if __name__ == "__main__":
+    try:
+        ret = main()
+    except Exception:
+        ret = 1
+        import traceback
+        traceback.print_exc(5)
+    sys.exit(ret)
-- 
1.9.1

[PATCH V2 6/7] populate_sdk_ext: record SDK_TARGETS in devtool.conf

[Chen Qi]

Record the value of SDK_TARGETS for later use of devtool's sdk plugin
for updating SDK.

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
---
 meta/classes/populate_sdk_ext.bbclass | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/meta/classes/populate_sdk_ext.bbclass b/meta/classes/populate_sdk_ext.bbclass
index d2ebcef..151ae1d 100644
--- a/meta/classes/populate_sdk_ext.bbclass
+++ b/meta/classes/populate_sdk_ext.bbclass
@@ -84,6 +84,8 @@ python copy_buildsystem () {
     config.set('General', 'bitbake_subdir', conf_bbpath)
     config.set('General', 'init_path', conf_initpath)
     config.set('General', 'core_meta_subdir', core_meta_subdir)
+    config.add_section('SDK')
+    config.set('SDK', 'sdk_targets', d.getVar('SDK_TARGETS', True))
     bb.utils.mkdirhier(os.path.join(baseoutpath, 'conf'))
     with open(os.path.join(baseoutpath, 'conf', 'devtool.conf'), 'w') as f:
         config.write(f)
-- 
1.9.1

[PATCH V2 7/7] devtool: add sdk.py plugin

[Chen Qi]

This plugin is only enabled when devtool is used within the extensible
SDK. It is used to update the current SDK from a local or remote server.

E.g.
devtool sdk-update /mnt/sdk-repo/
devtool sdk-update http://mysdkhost/sdk

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
---
 scripts/lib/devtool/sdk.py | 188 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 188 insertions(+)
 create mode 100644 scripts/lib/devtool/sdk.py

diff --git a/scripts/lib/devtool/sdk.py b/scripts/lib/devtool/sdk.py
new file mode 100644
index 0000000..9bc21ea
--- /dev/null
+++ b/scripts/lib/devtool/sdk.py
@@ -0,0 +1,188 @@
+# Development tool - sdk-update command plugin
+
+import os
+import subprocess
+import logging
+import glob
+import shutil
+import errno
+import sys
+from devtool import exec_build_env_command, setup_tinfoil
+
+logger = logging.getLogger('devtool')
+
+def plugin_init(pluginlist):
+    """Plugin initialization"""
+    pass
+
+def parse_locked_sigs(sigfile_path):
+    """Return <pn:task>:<hash> dictionary"""
+    sig_dict = {}
+    with open(sigfile_path) as f:
+        lines = f.readlines()
+        for line in lines:
+            if ':' in line:
+                taskkey, _, hashval = line.rpartition(':')
+                sig_dict[taskkey.strip()] = hashval.split()[0]
+    return sig_dict
+
+def generate_update_dict(sigfile_new, sigfile_old):
+    """Return a dict containing <pn:task>:<hash> which indicates what need to be updated"""
+    update_dict = {}
+    sigdict_new = parse_locked_sigs(sigfile_new)
+    sigdict_old = parse_locked_sigs(sigfile_old)
+    for k in sigdict_new:
+        if k not in sigdict_old:
+            update_dict[k] = sigdict_new[k]
+            continue
+        if sigdict_new[k] != sigdict_old[k]:
+            update_dict[k] = sigdict_new[k]
+            continue
+    return update_dict
+
+def get_sstate_objects(update_dict, newsdk_path):
+    """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]
+        p = sstate_dir + '/' + hashval[:2] + '/*' + hashval + '*.tgz'
+        files |= set(glob.glob(p))
+        p = sstate_dir + '/*/' + hashval[:2] + '/*' + hashval + '*.tgz'
+        files |= set(glob.glob(p))
+        files = list(files)
+        if len(files) == 1:
+            sstate_objects.extend(files)
+        elif len(files) > 1:
+            logger.error("More than one matching sstate object found for %s" % hashval)
+        
+    return sstate_objects
+
+def mkdir(d):
+    try:
+        os.makedirs(d)
+    except OSError as e:
+        if e.errno != errno.EEXIST:
+            raise e
+
+def install_sstate_objects(sstate_objects, src_sdk, dest_sdk):
+    """Install sstate objects into destination SDK"""
+    sstate_dir = os.path.join(dest_sdk, 'sstate-cache')
+    if not os.path.exists(sstate_dir):
+        logger.error("Missing sstate-cache directory in %s, it might not be an extensible SDK." % dest_sdk)
+        raise
+    for sb in sstate_objects:
+        dst = sb.replace(src_sdk, dest_sdk)
+        destdir = os.path.dirname(dst)
+        mkdir(destdir)
+        logger.debug("Copying %s to %s" % (sb, dst))
+        shutil.copy(sb, dst)
+
+def sdk_update(args, config, basepath, workspace):
+    # Fetch locked-sigs.inc file from remote/local destination
+    logger.debug("updateserver: %s" % args.updateserver)
+
+    # Make sure we are using sdk-update from within SDK
+    logger.debug("basepath = %s" % basepath)
+    old_locked_sig_file_path = os.path.join(basepath, 'conf/locked-sigs.inc')
+    if not os.path.exists(old_locked_sig_file_path):
+        logger.error("Not using devtool's sdk-update command from within an extensible SDK. Please specify correct basepath via --basepath option")
+        return -1
+    else:
+        logger.debug("Found conf/locked-sigs.inc in %s" % basepath)
+        
+    if ':' in args.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')
+        if not os.path.exists(new_locked_sig_file_path):
+            logger.error("%s doesn't exist or is not an extensible SDK" % args.updateserver)
+            return -1
+        else:
+            logger.debug("Found conf/locked-sigs.inc in %s" % args.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)
+        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)
+        logger.info("Updating configuration files")
+        new_conf_dir = os.path.join(args.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')
+        old_layers_dir = os.path.join(basepath, 'layers')
+        shutil.rmtree(old_layers_dir)
+        shutil.copytree(new_layers_dir, old_layers_dir)
+    else:
+        # devtool sdk-update http://myhost/sdk
+        tmpsdk_dir = '/tmp/sdk-ext'
+        if os.path.exists(tmpsdk_dir):
+            shutil.rmtree(tmpsdk_dir)
+        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)
+        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')))
+            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')))
+        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)
+        if len(update_dict) == 0:
+            logger.info("No need to update.")
+            return 0
+        # Update metadata
+        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)
+        else:
+            ret = -1
+        if ret != 0:
+            ret = subprocess.call("rm -rf layers && git clone %s/layers" % args.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', 'work-config.inc', '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)
+            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)
+
+    # 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
+    return 0
+
+def register_commands(subparsers, context):
+    """Register devtool subcommands from the sdk plugin"""
+    if context.fixed_setup:
+        parser_sdk = subparsers.add_parser('sdk-update', help='Update SDK components from a nominated destination')
+        parser_sdk.add_argument('updateserver', help='The update server to fetch latest SDK components')
+        parser_sdk.set_defaults(func=sdk_update)
-- 
1.9.1