diff options
| -rw-r--r-- | meta/classes/kernel-grub.bbclass | 90 |
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 +} + |