image/core-image: Handle conflicting IMAGE_FEATURES.

IMAGE_FEATURES such as 'ssh-server-dropbear' and 'ssh-server-openssh'
can't be both enabled. User can use the following variables to define
the relationship of image features:

IMAGE_FEATURES_REPLACES_foo = "bar" means including image feature "foo"
would replace the image feature "bar".

IMAGE_FEATURES_CONFLICTS_foo = "bar" means including both image features
"foo" and "bar" would cause an parsing error.

(From OE-Core rev: e36d12a9c1cf69540079e48a1dfadbc343758e48)

Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/core-image.bbclass

@@ -47,6 +47,14 @@ PACKAGE_GROUP_ssh-server-openssh = "task-core-ssh-openssh"
 PACKAGE_GROUP_package-management = "${ROOTFS_PKGMANAGE}"
 PACKAGE_GROUP_qt4-pkgs = "task-core-qt-demos"
 
+
+# IMAGE_FEAETURES_REPLACES_foo = 'bar1 bar2'
+# Including image feature foo would replace the image features bar1 and bar2
+IMAGE_FEATURES_REPLACES_ssh-server-openssh = "ssh-server-dropbear"
+
+# IMAGE_FEATURES_CONFLICTS_foo = 'bar1 bar2'
+# An error exception would be raised if both image features foo and bar1(or bar2) are included
+
 CORE_IMAGE_BASE_INSTALL = '\
     task-core-boot \
     task-base-extended \
@@ -60,7 +68,8 @@ IMAGE_INSTALL ?= "${CORE_IMAGE_BASE_INSTALL}"
 
 X11_IMAGE_FEATURES  = "x11-base apps-x11-core package-management"
 ENHANCED_IMAGE_FEATURES = "${X11_IMAGE_FEATURES} apps-x11-games apps-x11-pimlico package-management"
-SATO_IMAGE_FEATURES = "${ENHANCED_IMAGE_FEATURES} x11-sato ssh-server-dropbear"
+SSHSERVER_IMAGE_FEATURES ??= "ssh-server-dropbear"
+SATO_IMAGE_FEATURES = "${ENHANCED_IMAGE_FEATURES} x11-sato ${SSHSERVER_IMAGE_FEATURES}"
 
 inherit image
 

meta/classes/image.bbclass

@@ -94,6 +94,23 @@ python () {
         deps += " %s:do_populate_sysroot" % dep
     d.appendVarFlag('do_build', 'depends', deps)
 
+    #process IMAGE_FEATURES, we must do this before runtime_mapping_rename
+    #Check for replaces image features
+    features = set(oe.data.typed_value('IMAGE_FEATURES', d))
+    remain_features = features.copy()
+    for feature in features:
+        replaces = set((d.getVar("IMAGE_FEATURES_REPLACES_%s" % feature, True) or "").split())
+        remain_features -= replaces
+
+    #Check for conflict image features
+    for feature in remain_features:
+        conflicts = set((d.getVar("IMAGE_FEATURES_CONFLICTS_%s" % feature, True) or "").split())
+        temp = conflicts & remain_features
+        if temp:
+            bb.fatal("%s contains conflicting IMAGE_FEATURES %s %s" % (d.getVar('PN', True), feature, ' '.join(list(temp))))
+
+    d.setVar('IMAGE_FEATURES', ' '.join(list(remain_features)))
+
     # If we don't do this we try and run the mapping hooks while parsing which is slow
     # bitbake should really provide something to let us know this...
     if d.getVar('BB_WORKERCONTEXT', True) is not None:

meta/recipes-sato/images/core-image-sato-sdk.bb

@@ -8,6 +8,8 @@ form a standalone SDK."
 IMAGE_FEATURES += "apps-console-core ${SATO_IMAGE_FEATURES} dev-pkgs tools-sdk qt4-pkgs"
 EXTRA_IMAGE_FEATURES += "tools-debug tools-profile tools-testapps debug-tweaks"
 
+SSHSERVER_IMAGE_FEATURES = "ssh-server-openssh"
+
 LICENSE = "MIT"
 
 inherit core-image