#
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# While installing a rpm to update kernel on a deployed target, it will update
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# the boot area and the boot menu with the kernel as the priority but allow
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# you to fall back to the original kernel as well.
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#
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# - In kernel-image's preinstall scriptlet, it backs up original kernel to avoid
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# probable confliction with the new one.
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#
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# - In kernel-image's postinstall scriptlet, it modifies grub's config file to
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# updates the new kernel as the boot priority.
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#
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python __anonymous () {
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import re
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preinst = '''
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# Parsing confliction
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[ -f "$D/boot/grub/menu.list" ] && grubcfg="$D/boot/grub/menu.list"
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[ -f "$D/boot/grub/grub.cfg" ] && grubcfg="$D/boot/grub/grub.cfg"
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if [ -n "$grubcfg" ]; then
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# Dereference symlink to avoid confliction with new kernel name.
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if grep -q "/KERNEL_IMAGETYPE \+root=" $grubcfg; then
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if [ -L "$D/boot/KERNEL_IMAGETYPE" ]; then
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kimage=`realpath $D/boot/KERNEL_IMAGETYPE 2>/dev/null`
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if [ -f "$D$kimage" ]; then
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sed -i "s:KERNEL_IMAGETYPE \+root=:${kimage##*/} root=:" $grubcfg
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fi
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fi
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fi
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# Rename old kernel if it conflicts with new kernel name.
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if grep -q "/KERNEL_IMAGETYPE-${KERNEL_VERSION} \+root=" $grubcfg; then
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if [ -f "$D/boot/KERNEL_IMAGETYPE-${KERNEL_VERSION}" ]; then
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timestamp=`date +%s`
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kimage="$D/boot/KERNEL_IMAGETYPE-${KERNEL_VERSION}-$timestamp-back"
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sed -i "s:KERNEL_IMAGETYPE-${KERNEL_VERSION} \+root=:${kimage##*/} root=:" $grubcfg
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mv "$D/boot/KERNEL_IMAGETYPE-${KERNEL_VERSION}" "$kimage"
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fi
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fi
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fi
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'''
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postinst = '''
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get_new_grub_cfg() {
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grubcfg="$1"
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old_image="$2"
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title="Update KERNEL_IMAGETYPE-${KERNEL_VERSION}-${PV}"
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if [ "${grubcfg##*/}" = "grub.cfg" ]; then
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rootfs=`grep " *linux \+[^ ]\+ \+root=" $grubcfg -m 1 | \
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sed "s#${old_image}#${old_image%/*}/KERNEL_IMAGETYPE-${KERNEL_VERSION}#"`
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echo "menuentry \"$title\" {"
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echo " set root=(hd0,1)"
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echo "$rootfs"
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echo "}"
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elif [ "${grubcfg##*/}" = "menu.list" ]; then
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rootfs=`grep "kernel \+[^ ]\+ \+root=" $grubcfg -m 1 | \
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sed "s#${old_image}#${old_image%/*}/KERNEL_IMAGETYPE-${KERNEL_VERSION}#"`
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echo "default 0"
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echo "timeout 30"
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echo "title $title"
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echo "root (hd0,0)"
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echo "$rootfs"
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fi
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}
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get_old_grub_cfg() {
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grubcfg="$1"
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if [ "${grubcfg##*/}" = "grub.cfg" ]; then
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cat "$grubcfg"
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elif [ "${grubcfg##*/}" = "menu.list" ]; then
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sed -e '/^default/d' -e '/^timeout/d' "$grubcfg"
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fi
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}
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if [ -f "$D/boot/grub/grub.cfg" ]; then
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grubcfg="$D/boot/grub/grub.cfg"
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old_image=`grep ' *linux \+[^ ]\+ \+root=' -m 1 "$grubcfg" | awk '{print $2}'`
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elif [ -f "$D/boot/grub/menu.list" ]; then
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grubcfg="$D/boot/grub/menu.list"
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old_image=`grep '^kernel \+[^ ]\+ \+root=' -m 1 "$grubcfg" | awk '{print $2}'`
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fi
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# Don't update grubcfg at first install while old bzImage doesn't exist.
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if [ -f "$D/boot/${old_image##*/}" ]; then
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grubcfgtmp="$grubcfg.tmp"
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get_new_grub_cfg "$grubcfg" "$old_image" > $grubcfgtmp
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get_old_grub_cfg "$grubcfg" >> $grubcfgtmp
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mv $grubcfgtmp $grubcfg
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echo "Caution! Update kernel may affect kernel-module!"
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fi
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'''
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imagetypes = d.getVar('KERNEL_IMAGETYPES')
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imagetypes = re.sub(r'\.gz$', '', imagetypes)
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for type in imagetypes.split():
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typelower = type.lower()
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preinst_append = preinst.replace('KERNEL_IMAGETYPE', type)
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postinst_prepend = postinst.replace('KERNEL_IMAGETYPE', type)
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d.setVar('pkg_preinst:kernel-image-' + typelower + ':append', preinst_append)
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d.setVar('pkg_postinst:kernel-image-' + typelower + ':prepend', postinst_prepend)
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}
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