144 lines
4.7 KiB
Bash
Executable File
144 lines
4.7 KiB
Bash
Executable File
#!/usr/bin/bash
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COMMAND="$1"
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KERNEL_VERSION="$2"
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KDUMP_INITRD_DIR_ABS="$3"
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KERNEL_IMAGE="$4"
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grub_etc_default="/etc/default/grub"
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ver_lt() {
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[[ "$(echo -e "$1\n$2" | sort -V)" == $1$'\n'* ]] && [[ $1 != "$2" ]]
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}
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# Read crashkernel= value in /etc/default/grub
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get_grub_etc_ck() {
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[[ -e $grub_etc_default ]] && \
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sed -n -e "s/^GRUB_CMDLINE_LINUX=.*\(crashkernel=[^\ \"]*\)[\ \"].*$/\1/p" $grub_etc_default
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}
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# Read crashkernel.default value of specified kernel
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get_ck_default() {
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ck_file="/usr/lib/modules/$1/crashkernel.default"
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[[ -f "$ck_file" ]] && cat "$ck_file"
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}
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# Iterate installed kernels, find the kernel with the highest version that has a
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# valid crashkernel.default file, exclude current installing/removing kernel
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#
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# $1: a string representing a crashkernel= cmdline. If given, will also check the
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# content of crashkernel.default, only crashkernel.default with the same value will match
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get_highest_ck_default_kver() {
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for kernel in $(find /usr/lib/modules -maxdepth 1 -mindepth 1 -printf "%f\n" | sort --version-sort -r); do
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[[ $kernel == "$KERNEL_VERSION" ]] && continue
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[[ -s "/usr/lib/modules/$kernel/crashkernel.default" ]] || continue
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echo "$kernel"
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return 0
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done
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return 1
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}
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set_grub_ck() {
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sed -i -e "s/^\(GRUB_CMDLINE_LINUX=.*\)crashkernel=[^\ \"]*\([\ \"].*\)$/\1$1\2/" "$grub_etc_default"
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}
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# Set specified kernel's crashkernel cmdline value
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set_kernel_ck() {
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kernel=$1
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ck_cmdline=$2
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entry=$(grubby --info ALL | grep "^kernel=.*$kernel")
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entry=${entry#kernel=}
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entry=${entry#\"}
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entry=${entry%\"}
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if [[ -z "$entry" ]]; then
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echo "$0: failed to find boot entry for kernel $kernel"
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return 1
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fi
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[[ -f /etc/zipl.conf ]] && zipl_arg="--zipl"
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grubby --args "$ck_cmdline" --update-kernel "$entry" $zipl_arg
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[[ $zipl_arg ]] && zipl > /dev/null
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}
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case "$COMMAND" in
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add)
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# - If current boot kernel is using default crashkernel value, update
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# installing kernel's crashkernel value to its default value,
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# - If intalling a higher version kernel, and /etc/default/grub's
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# crashkernel value is using default value, update it to installing
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# kernel's default value.
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inst_ck_default=$(get_ck_default "$KERNEL_VERSION")
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# If installing kernel doesn't have crashkernel.default, just exit.
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[[ -z "$inst_ck_default" ]] && exit 0
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boot_kernel=$(uname -r)
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boot_ck_cmdline=$(sed -n -e "s/^.*\(crashkernel=\S*\).*$/\1/p" /proc/cmdline)
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highest_ck_default_kver=$(get_highest_ck_default_kver)
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highest_ck_default=$(get_ck_default "$highest_ck_default_kver")
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# Try update /etc/default/grub if present, else grub2-mkconfig could
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# override crashkernel value.
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grub_etc_ck=$(get_grub_etc_ck)
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if [[ -n "$grub_etc_ck" ]]; then
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if [[ -z "$highest_ck_default_kver" ]]; then
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# None of installed kernel have a crashkernel.default,
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# check for 'crashkernel=auto' in case of legacy kernel
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[[ "$grub_etc_ck" == "crashkernel=auto" ]] && \
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set_grub_ck "$inst_ck_default"
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else
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# There is a valid crashkernel.default, check if installing kernel
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# have a higher version and grub config is using default value
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ver_lt "$highest_ck_default_kver" "$KERNEL_VERSION" && \
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[[ "$grub_etc_ck" == "$highest_ck_default" ]] && \
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[[ "$grub_etc_ck" != "$inst_ck_default" ]] && \
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set_grub_ck "$inst_ck_default"
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fi
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fi
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# Exit if crashkernel is not used in current cmdline
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[[ -z $boot_ck_cmdline ]] && exit 0
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# Get current boot kernel's default value
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boot_ck_default=$(get_ck_default "$boot_kernel")
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if [[ $boot_ck_cmdline == "crashkernel=auto" ]]; then
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# Legacy RHEL kernel defaults to "auto"
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boot_ck_default="$boot_ck_cmdline"
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fi
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# If boot kernel doesn't have a crashkernel.default, check
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# if it's using any installed kernel's crashkernel.default
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if [[ -z $boot_ck_default ]]; then
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[[ $(get_highest_ck_default_kver "$boot_ck_cmdline") ]] && boot_ck_default="$boot_ck_cmdline"
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fi
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# If boot kernel is using a default crashkernel, update
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# installing kernel's crashkernel to new default value
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if [[ "$boot_ck_cmdline" != "$inst_ck_default" ]] && [[ "$boot_ck_cmdline" == "$boot_ck_default" ]]; then
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set_kernel_ck "$KERNEL_VERSION" "$inst_ck_default"
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fi
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;;
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remove)
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# If grub default value is upgraded when this kernel was installed, try downgrade it
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grub_etc_ck=$(get_grub_etc_ck)
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[[ $grub_etc_ck ]] || exit 0
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removing_ck_conf=$(get_ck_default "$KERNEL_VERSION")
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[[ $removing_ck_conf ]] || exit 0
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highest_ck_default_kver=$(get_highest_ck_default_kver) || exit 0
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highest_ck_default=$(get_ck_default "$highest_ck_default_kver")
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[[ $highest_ck_default ]] || exit 0
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if ver_lt "$highest_ck_default_kver" "$KERNEL_VERSION"; then
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if [[ $grub_etc_ck == "$removing_ck_conf" ]] && [[ $grub_etc_ck != "$highest_ck_default" ]]; then
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set_grub_ck "$highest_ck_default"
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fi
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fi
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;;
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esac
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