module.bbclass: Create a new depmodwrapper to assist cross-installs

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>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 43 insertions, 0 deletions

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 00000000000..efb1cac4c66
--- /dev/null
+++ b/meta/recipes-kernel/kmod/depmodwrapper-cross_1.0.bb
@@ -0,0 +1,43 @@
+DESCRIPTION = "Depmod wrapper script"
+LICENSE = "MIT"
+PR = "r0"
+LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
+
+# We need the following for the sstate code to process the wrapper
+SSTATE_SCAN_FILES += "depmodwrapper"
+
+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" -o "\$2" != "-b" ]; then
+    echo "Usage: depmodwrapper -a -b rootfs KERNEL_VERSION" >&2
+    exit 1
+fi
+if [ ! -r ${STAGING_KERNEL_DIR}/kernel-abiversion ]; then
+    echo "Unable to read: ${STAGING_KERNEL_DIR}/kernel-abiversion" >&2
+else
+    kernelabi=\$(cat ${STAGING_KERNEL_DIR}/kernel-abiversion)
+    if [ "\$kernelabi" != "\$4" ]; then
+        echo "Error: Kernel version \$4 does not match kernel-abiversion (\$kernelabi)" >&2
+        exit 1
+    fi
+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}
+}