[PATCH 2/2] module.bbclass: Create a new depmodwrapper to assist cross-installs

[Mark Hatle <mark.hatle@windriver.com>]

Previously the build path to STAGING_KERNEL_DIR was being embedded into the
package post install scripts.  We avoid this behavior by generating a special
depmodwrapper script.  This script contains that hard-coded path, ensuring
that re-use of the sstate-cache (and/or packages) will always run through the
wrapper generated by the current build with a checksum that includes
STAGING_KERNEL_DIR.

[ YOCTO #3962 ]

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
---
 meta/classes/image.bbclass                         |    4 +-
 meta/classes/kernel.bbclass                        |    8 ++--
 meta/classes/module.bbclass                        |    4 +-
 .../recipes-kernel/kmod/depmodwrapper-cross_1.0.bb |   34 ++++++++++++++++++++
 4 files changed, 42 insertions(+), 8 deletions(-)
 create mode 100644 meta/recipes-kernel/kmod/depmodwrapper-cross_1.0.bb

diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
index dd78acb..af17331 100644
--- a/meta/classes/image.bbclass
+++ b/meta/classes/image.bbclass
@@ -10,7 +10,7 @@ inherit gzipnative
 
 LICENSE = "MIT"
 PACKAGES = ""
-DEPENDS += "${MLPREFIX}qemuwrapper-cross"
+DEPENDS += "${MLPREFIX}qemuwrapper-cross depmodwrapper-cross"
 RDEPENDS += "${IMAGE_INSTALL} ${LINGUAS_INSTALL} ${NORMAL_FEATURE_INSTALL} ${ROOTFS_BOOTSTRAP_INSTALL}"
 RRECOMMENDS += "${NORMAL_FEATURE_INSTALL_OPTIONAL}"
 
@@ -283,7 +283,7 @@ fakeroot do_rootfs () {
 		KERNEL_VERSION=`cat ${STAGING_KERNEL_DIR}/kernel-abiversion`
 
 		mkdir -p ${IMAGE_ROOTFS}/lib/modules/$KERNEL_VERSION
-		depmod -a -b ${IMAGE_ROOTFS} -F ${STAGING_KERNEL_DIR}/System.map-$KERNEL_VERSION $KERNEL_VERSION
+		depmodwrapper -a -b ${IMAGE_ROOTFS} $KERNEL_VERSION
 	fi
 
 	${IMAGE_PREPROCESS_COMMAND}
diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index e8c585b..2bdc2fc 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -1,7 +1,7 @@
 inherit linux-kernel-base module_strip
 
 PROVIDES += "virtual/kernel"
-DEPENDS += "virtual/${TARGET_PREFIX}gcc kmod-native"
+DEPENDS += "virtual/${TARGET_PREFIX}gcc kmod-native depmodwrapper-cross"
 
 # we include gcc above, we dont need virtual/libc
 INHIBIT_DEFAULT_DEPS = "1"
@@ -272,7 +272,7 @@ if [ ! -e "$D/lib/modules/${KERNEL_VERSION}" ]; then
 	mkdir -p $D/lib/modules/${KERNEL_VERSION}
 fi
 if [ -n "$D" ]; then
-	depmod -a -b $D -F ${STAGING_KERNEL_DIR}/System.map-${KERNEL_VERSION} ${KERNEL_VERSION}
+	depmodwrapper -a -b $D ${KERNEL_VERSION}
 else
 	depmod -a ${KERNEL_VERSION}
 fi
@@ -282,7 +282,7 @@ pkg_postinst_modules () {
 if [ -z "$D" ]; then
 	depmod -a ${KERNEL_VERSION}
 else
-	depmod -a -b $D -F ${STAGING_KERNEL_DIR}/System.map-${KERNEL_VERSION} ${KERNEL_VERSION}
+	depmodwrapper -a -b $D ${KERNEL_VERSION}
 fi
 }
 
@@ -290,7 +290,7 @@ pkg_postrm_modules () {
 if [ -z "$D" ]; then
 	depmod -a ${KERNEL_VERSION}
 else
-	depmod -a -b $D -F ${STAGING_KERNEL_DIR}/System.map-${KERNEL_VERSION} ${KERNEL_VERSION}
+	depmodwrapper -a -b $D ${KERNEL_VERSION}
 fi
 }
 
diff --git a/meta/classes/module.bbclass b/meta/classes/module.bbclass
index e2174a1..2c1888c 100644
--- a/meta/classes/module.bbclass
+++ b/meta/classes/module.bbclass
@@ -28,7 +28,7 @@ module_pkg_postinst () {
 if [ -z "$D" ]; then
 	depmod -a ${KERNEL_VERSION}
 else
-	depmod -a -b $D -F ${STAGING_KERNEL_DIR}/System.map-${KERNEL_VERSION} ${KERNEL_VERSION}
+	depmodwrapper -a -b $D ${KERNEL_VERSION}
 fi
 }
 
@@ -36,7 +36,7 @@ module_pkg_postrm () {
 if [ -z "$D" ]; then
 	depmod -a ${KERNEL_VERSION}
 else
-	depmod -a -b $D -F ${STAGING_KERNEL_DIR}/System.map-${KERNEL_VERSION} ${KERNEL_VERSION}
+	depmodwrapper -a -b $D ${KERNEL_VERSION}
 fi
 }
 
diff --git a/meta/recipes-kernel/kmod/depmodwrapper-cross_1.0.bb b/meta/recipes-kernel/kmod/depmodwrapper-cross_1.0.bb
new file mode 100644
index 0000000..646c4cd
--- /dev/null
+++ b/meta/recipes-kernel/kmod/depmodwrapper-cross_1.0.bb
@@ -0,0 +1,34 @@
+DESCRIPTION = "Depmod wrapper script"
+LICENSE = "MIT"
+PR = "r0"
+LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
+
+# We need to evaluate it to the final path for vardeps to
+# work properly.
+STAGING_KERNEL_DIR := "${STAGING_KERNEL_DIR}"
+
+do_install() {
+	install -d ${D}${bindir_crossscripts}/
+
+	cat > ${D}${bindir_crossscripts}/depmodwrapper << EOF
+#!/bin/sh
+# Expected to be called as: depmodwrapper -a KERNEL_VERSION
+if [ "\$1" != "-a" -a "\$2" != "-b" ]; then
+    echo "Usage: depmodwrapper -a -b rootfs KERNEL_VERSION" >&2
+    exit 1
+fi
+if [ ! -r ${STAGING_KERNEL_DIR}/System.map-\$4 ]; then
+    echo "Unable to read: ${STAGING_KERNEL_DIR}/System.map-\$4" >&2
+    exec env depmod "\$1" "\$2" "\$3" "\$4"
+else
+    exec env depmod "\$1" "\$2" "\$3" -F "${STAGING_KERNEL_DIR}/System.map-\$4" "\$4"
+fi
+EOF
+	chmod +x ${D}${bindir_crossscripts}/depmodwrapper
+}
+
+SYSROOT_PREPROCESS_FUNCS += "depmodwrapper_sysroot_preprocess"
+
+depmodwrapper_sysroot_preprocess () {
+	sysroot_stage_dir ${D}${bindir_crossscripts} ${SYSROOT_DESTDIR}${bindir_crossscripts}
+}
-- 
1.7.1