[OE-core] [PATCH V2 1/1] kernel.bbclass: Add kernel_version_sanity_check function

[California Sullivan]

The kernel being built should match what the recipe claims it is
building. This function ensures that happens by comparing the version
information in the kernel's Makefile to the PV the recipe is using.

v2 changes:
* Match against PV instead of LINUX_VERSION
* Match against EXTRAVERSION as well (e.g., -rc4)
* Cleaned up version string building

Fixes [YOCTO #6767].

Signed-off-by: California Sullivan <california.l.sullivan at intel.com>
---
 meta/classes/kernel.bbclass               | 30 ++++++++++++++++++++++++++++++
 meta/recipes-kernel/linux/linux-yocto.inc |  1 +
 2 files changed, 31 insertions(+)

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index a6112e8..f894795 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -327,6 +327,36 @@ kernel_do_install() {
 }
 do_install[prefuncs] += "package_get_auto_pr"
 
+# Must be ran no earlier than after do_kernel_checkout or else Makefile won't be in ${S}/Makefile
+do_kernel_version_sanity_check() {
+	# The Makefile determines the kernel version shown at runtime
+	# Don't use KERNEL_VERSION because the headers it grabs the version from aren't generated until do_compile
+	VERSION=$(grep "^VERSION =" ${S}/Makefile | sed s/.*=\ *//)
+	PATCHLEVEL=$(grep "^PATCHLEVEL =" ${S}/Makefile | sed s/.*=\ *//)
+	SUBLEVEL=$(grep "^SUBLEVEL =" ${S}/Makefile | sed s/.*=\ *//)
+	EXTRAVERSION=$(grep "^EXTRAVERSION =" ${S}/Makefile | sed s/.*=\ *//)
+
+	# Build a string for regex and a plain version string
+	reg="^${VERSION}\.${PATCHLEVEL}"
+	vers="${VERSION}.${PATCHLEVEL}"
+	if [ -n "${SUBLEVEL}" ]; then
+		# Ignoring a SUBLEVEL of zero is fine
+		if [ "${SUBLEVEL}" = "0" ]; then
+			reg="${reg}(\.${SUBLEVEL})?"
+		else
+			reg="${reg}\.${SUBLEVEL}"
+			vers="${vers}.${SUBLEVEL}"
+		fi
+	fi
+	vers="${vers}${EXTRAVERSION}"
+	reg="${reg}${EXTRAVERSION}"
+
+	if [ -z `echo ${PV} | grep -E "${reg}"` ]; then
+		bbfatal "Package Version (${PV}) does not match of kernel being built (${vers}). Please update the PV variable to match the kernel source."
+	fi
+	exit 0
+}
+
 addtask shared_workdir after do_compile before do_compile_kernelmodules
 addtask shared_workdir_setscene
 
diff --git a/meta/recipes-kernel/linux/linux-yocto.inc b/meta/recipes-kernel/linux/linux-yocto.inc
index 98a48ec..d979662 100644
--- a/meta/recipes-kernel/linux/linux-yocto.inc
+++ b/meta/recipes-kernel/linux/linux-yocto.inc
@@ -55,6 +55,7 @@ do_install_append(){
 }
 
 # extra tasks
+addtask kernel_version_sanity_check after do_kernel_checkout before do_compile
 addtask kernel_link_images after do_compile before do_install
 addtask validate_branches before do_patch after do_kernel_checkout
 addtask kernel_configcheck after do_configure before do_compile
-- 
2.5.5