scancode.bbclass: Adding a bbclass for scancode license scaning utility

This is adding the functionality to run scancode utility on code.
You need to set the following variables to use it. You can override
 these from local.conf or auto.conf.
1) SCANCODE_GIT_LOCATION: Git Path for scancode-toolkit cloning, default is set.
2) SCANCODE_TAG: Select tag, if you want.
3) SCANCODE_FORMAT: Output file format json or html-app.
4) SCANCODE_SRC_LOCATION: Location to store scancode-toolkit.

This belongs to OI-2.

Signed-off-by: H M Irfan Sadiq <irfan_sadiq@mentor.com>
Signed-off-by: Noor Ahsan <noor_ahsan@mentor.com>

meta-oe/classes/scancode.bbclass

@@ -0,0 +1,35 @@
+# We use scancode utlity for extacting licence information.
+# scancode itself is an OSS Utlitity.
+# For more informaiton https://github.com/nexB/scancode-toolkit
+
+SCANCODE_FORMAT ?= "html-app"
+EXT = "${@'html' if d.getVar('SCANCODE_FORMAT', True) == 'html-app' else 'json'}"
+SCANCODE_TOOLKIT = "${@get_scancode_toolkit(d)}"
+SCANCODE_TAG = "v2.2.1"
+SCANCODE_GIT_LOCATION ?= "https://github.com/nexB/scancode-toolkit.git"
+SCANCODE_SRC_LOCATION ?= "${DL_DIR}/scancode"
+
+def get_scancode_toolkit(d):
+    lf = bb.utils.lockfile(d.getVar('SCANCODE_SRC_LOCATION', True) + ".lock")
+    if (not os.path.exists(d.getVar('SCANCODE_SRC_LOCATION', True))):
+        os.system("git clone %s %s -b %s" % (d.getVar('SCANCODE_GIT_LOCATION', True), d.getVar('SCANCODE_SRC_LOCATION', True), d.getVar('SCANCODE_TAG', True)))
+    bb.utils.unlockfile(lf)
+    return (d.getVar('SCANCODE_SRC_LOCATION', True))
+
+do_scancode() {
+	mkdir -p ${DEPLOY_DIR_IMAGE}/scancode
+	cd ${SCANCODE_TOOLKIT}
+	if [ -d "${S}" ]; then
+		./scancode ${S} --format  ${SCANCODE_FORMAT} ${DEPLOY_DIR_IMAGE}/scancode/${PN}.${EXT}
+	fi
+}
+
+addtask scancode after do_patch
+
+do_scancode_oss() {
+    echo "We are done running scancode"
+}
+
+do_scancode_oss[recrdeptask] = "do_scancode_oss do_scancode"
+do_scancode_oss[nostamp] = "1"
+addtask do_scancode_oss after do_scancode