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authorHongxu Jia <hongxu.jia@windriver.com>2013-10-18 10:45:35 +0800
committerRichard Purdie <richard.purdie@linuxfoundation.org>2013-10-26 15:53:24 +0100
commit8d872e7712a62fa4313a1114a92907c29beffa2e (patch)
treeb812692eb8726b13d65d0461cd31fda526c3b00c /meta/classes/kernel-grub.bbclass
parent15ba35aebd7550e53e9f2f35de6b709937dbb55c (diff)
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kernel-grub.bbclass: add a method to install/update for bzImage
While installing a rpm to update kernel on a deployed target, it will update the boot area and the boot menu with the kernel as the priority but allow you to fall back to the original kernel as well. - In kernel-image's preinstall scriptlet, it backs up original kernel to avoid probable confliction with the new one. - In kernel-image's postinstall scriptlet, it modify grub's config file to updates the new kernel as the boot priority. [YOCTO #4104] Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com> Signed-off-by: Saul Wold <sgw@linux.intel.com>
Diffstat (limited to 'meta/classes/kernel-grub.bbclass')
-rw-r--r--meta/classes/kernel-grub.bbclass90
1 files changed, 90 insertions, 0 deletions
diff --git a/meta/classes/kernel-grub.bbclass b/meta/classes/kernel-grub.bbclass
new file mode 100644
index 0000000000..70564f010a
--- /dev/null
+++ b/meta/classes/kernel-grub.bbclass
@@ -0,0 +1,90 @@
+#
+# While installing a rpm to update kernel on a deployed target, it will update
+# the boot area and the boot menu with the kernel as the priority but allow
+# you to fall back to the original kernel as well.
+#
+# - In kernel-image's preinstall scriptlet, it backs up original kernel to avoid
+# probable confliction with the new one.
+#
+# - In kernel-image's postinstall scriptlet, it modifies grub's config file to
+# updates the new kernel as the boot priority.
+#
+
+pkg_preinst_kernel-image_append () {
+ # Parsing confliction
+ [ -f "$D/boot/grub/menu.list" ] && grubcfg="$D/boot/grub/menu.list"
+ [ -f "$D/boot/grub/grub.cfg" ] && grubcfg="$D/boot/grub/grub.cfg"
+ if [ -n "$grubcfg" ]; then
+ # Dereference symlink to avoid confliction with new kernel name.
+ if grep -q "/${KERNEL_IMAGETYPE} \+root=" $grubcfg; then
+ if [ -L "$D/boot/${KERNEL_IMAGETYPE}" ]; then
+ kimage=`realpath $D/boot/${KERNEL_IMAGETYPE} 2>/dev/null`
+ if [ -f "$D$kimage" ]; then
+ sed -i "s:${KERNEL_IMAGETYPE} \+root=:${kimage##*/} root=:" $grubcfg
+ fi
+ fi
+ fi
+
+ # Rename old kernel if it conflicts with new kernel name.
+ if grep -q "/${KERNEL_IMAGETYPE}-${KERNEL_VERSION} \+root=" $grubcfg; then
+ if [ -f "$D/boot/${KERNEL_IMAGETYPE}-${KERNEL_VERSION}" ]; then
+ timestamp=`date +%s`
+ kimage="$D/boot/${KERNEL_IMAGETYPE}-${KERNEL_VERSION}-$timestamp-back"
+ sed -i "s:${KERNEL_IMAGETYPE}-${KERNEL_VERSION} \+root=:${kimage##*/} root=:" $grubcfg
+ mv "$D/boot/${KERNEL_IMAGETYPE}-${KERNEL_VERSION}" "$kimage"
+ fi
+ fi
+ fi
+}
+
+pkg_postinst_kernel-image_prepend () {
+ get_new_grub_cfg() {
+ grubcfg="$1"
+ title="Update ${KERNEL_IMAGETYPE}-${KERNEL_VERSION}-${PV}"
+ if [ "${grubcfg##*/}" = "grub.cfg" ]; then
+ rootfs=`grep " *linux \+[^ ]\+ \+root=" $grubcfg -m 1 | \
+ sed "s# *linux \+[^ ]\+ \+root=# linux /${KERNEL_IMAGETYPE}-${KERNEL_VERSION} root=#"`
+
+ echo "menuentry \"$title\" {"
+ echo " set root=(hd0,1)"
+ echo "$rootfs"
+ echo "}"
+ elif [ "${grubcfg##*/}" = "menu.list" ]; then
+ rootfs=`grep "kernel \+[^ ]\+ \+root=" $grubcfg -m 1 | \
+ sed "s#kernel \+[^ ]\+ \+root=#kernel /${KERNEL_IMAGETYPE}-${KERNEL_VERSION} root=#"`
+
+ echo "default 0"
+ echo "timeout 30"
+ echo "title $title"
+ echo "root (hd0,0)"
+ echo "$rootfs"
+ fi
+ }
+
+ get_old_grub_cfg() {
+ grubcfg="$1"
+ if [ "${grubcfg##*/}" = "grub.cfg" ]; then
+ cat "$grubcfg"
+ elif [ "${grubcfg##*/}" = "menu.list" ]; then
+ cat "$grubcfg" | sed -e '/^default/d' -e '/^timeout/d'
+ fi
+ }
+
+ if [ -f "$D/boot/grub/grub.cfg" ]; then
+ grubcfg="$D/boot/grub/grub.cfg"
+ old_image=`grep ' *linux \+[^ ]\+ \+root=' -m 1 "$grubcfg" | awk '{print $2}'`
+ elif [ -f "$D/boot/grub/menu.list" ]; then
+ grubcfg="$D/boot/grub/menu.list"
+ old_image=`grep '^kernel \+[^ ]\+ \+root=' -m 1 "$grubcfg" | awk '{print $2}'`
+ fi
+
+ # Don't update grubcfg at first install while old bzImage doesn't exist.
+ if [ -f "$D/boot/$old_image" ]; then
+ grubcfgtmp="$grubcfg.tmp"
+ get_new_grub_cfg "$grubcfg" > $grubcfgtmp
+ get_old_grub_cfg "$grubcfg" >> $grubcfgtmp
+ mv $grubcfgtmp $grubcfg
+ echo "Caution! Update kernel may affect kernel-module!"
+ fi
+}
+