1# 2# Copyright OpenEmbedded Contributors 3# 4# SPDX-License-Identifier: MIT 5# 6 7# 8# While installing a rpm to update kernel on a deployed target, it will update 9# the boot area and the boot menu with the kernel as the priority but allow 10# you to fall back to the original kernel as well. 11# 12# - In kernel-image's preinstall scriptlet, it backs up original kernel to avoid 13# probable confliction with the new one. 14# 15# - In kernel-image's postinstall scriptlet, it modifies grub's config file to 16# updates the new kernel as the boot priority. 17# 18 19python __anonymous () { 20 import re 21 22 preinst = ''' 23 # Parsing confliction 24 [ -f "$D/boot/grub/menu.list" ] && grubcfg="$D/boot/grub/menu.list" 25 [ -f "$D/boot/grub/grub.cfg" ] && grubcfg="$D/boot/grub/grub.cfg" 26 if [ -n "$grubcfg" ]; then 27 # Dereference symlink to avoid confliction with new kernel name. 28 if grep -q "/KERNEL_IMAGETYPE \+root=" $grubcfg; then 29 if [ -L "$D/boot/KERNEL_IMAGETYPE" ]; then 30 kimage=`realpath $D/boot/KERNEL_IMAGETYPE 2>/dev/null` 31 if [ -f "$D$kimage" ]; then 32 sed -i "s:KERNEL_IMAGETYPE \+root=:${kimage##*/} root=:" $grubcfg 33 fi 34 fi 35 fi 36 37 # Rename old kernel if it conflicts with new kernel name. 38 if grep -q "/KERNEL_IMAGETYPE-${KERNEL_VERSION} \+root=" $grubcfg; then 39 if [ -f "$D/boot/KERNEL_IMAGETYPE-${KERNEL_VERSION}" ]; then 40 timestamp=`date +%s` 41 kimage="$D/boot/KERNEL_IMAGETYPE-${KERNEL_VERSION}-$timestamp-back" 42 sed -i "s:KERNEL_IMAGETYPE-${KERNEL_VERSION} \+root=:${kimage##*/} root=:" $grubcfg 43 mv "$D/boot/KERNEL_IMAGETYPE-${KERNEL_VERSION}" "$kimage" 44 fi 45 fi 46 fi 47''' 48 49 postinst = ''' 50 get_new_grub_cfg() { 51 grubcfg="$1" 52 old_image="$2" 53 title="Update KERNEL_IMAGETYPE-${KERNEL_VERSION}-${PV}" 54 if [ "${grubcfg##*/}" = "grub.cfg" ]; then 55 rootfs=`grep " *linux \+[^ ]\+ \+root=" $grubcfg -m 1 | \ 56 sed "s#${old_image}#${old_image%/*}/KERNEL_IMAGETYPE-${KERNEL_VERSION}#"` 57 58 echo "menuentry \"$title\" {" 59 echo " set root=(hd0,1)" 60 echo "$rootfs" 61 echo "}" 62 elif [ "${grubcfg##*/}" = "menu.list" ]; then 63 rootfs=`grep "kernel \+[^ ]\+ \+root=" $grubcfg -m 1 | \ 64 sed "s#${old_image}#${old_image%/*}/KERNEL_IMAGETYPE-${KERNEL_VERSION}#"` 65 66 echo "default 0" 67 echo "timeout 30" 68 echo "title $title" 69 echo "root (hd0,0)" 70 echo "$rootfs" 71 fi 72 } 73 74 get_old_grub_cfg() { 75 grubcfg="$1" 76 if [ "${grubcfg##*/}" = "grub.cfg" ]; then 77 cat "$grubcfg" 78 elif [ "${grubcfg##*/}" = "menu.list" ]; then 79 sed -e '/^default/d' -e '/^timeout/d' "$grubcfg" 80 fi 81 } 82 83 if [ -f "$D/boot/grub/grub.cfg" ]; then 84 grubcfg="$D/boot/grub/grub.cfg" 85 old_image=`grep ' *linux \+[^ ]\+ \+root=' -m 1 "$grubcfg" | awk '{print $2}'` 86 elif [ -f "$D/boot/grub/menu.list" ]; then 87 grubcfg="$D/boot/grub/menu.list" 88 old_image=`grep '^kernel \+[^ ]\+ \+root=' -m 1 "$grubcfg" | awk '{print $2}'` 89 fi 90 91 # Don't update grubcfg at first install while old bzImage doesn't exist. 92 if [ -f "$D/boot/${old_image##*/}" ]; then 93 grubcfgtmp="$grubcfg.tmp" 94 get_new_grub_cfg "$grubcfg" "$old_image" > $grubcfgtmp 95 get_old_grub_cfg "$grubcfg" >> $grubcfgtmp 96 mv $grubcfgtmp $grubcfg 97 echo "Caution! Update kernel may affect kernel-module!" 98 fi 99''' 100 101 imagetypes = d.getVar('KERNEL_IMAGETYPES') 102 imagetypes = re.sub(r'\.gz$', '', imagetypes) 103 104 for type in imagetypes.split(): 105 typelower = type.lower() 106 preinst_append = preinst.replace('KERNEL_IMAGETYPE', type) 107 postinst_prepend = postinst.replace('KERNEL_IMAGETYPE', type) 108 d.setVar('pkg_preinst:kernel-image-' + typelower + ':append', preinst_append) 109 d.setVar('pkg_postinst:kernel-image-' + typelower + ':prepend', postinst_prepend) 110} 111 112