[PATCH v3 04/13] add a helper function to read kernel cmdline parameter from grubby --info

This helper function will be used to retrieve the value of kernel cmdline parameters including crashkernel, fadump, swiotlb and etc. Suggested-by: Philipp Rudo <prudo(a)redhat.com&gt; Signed-off-by: Coiby Xu <coxu(a)redhat.com&gt; --- kdumpctl | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/kdumpctl b/kdumpctl index 1938968..7fc3a4d 100755 --- a/kdumpctl +++ b/kdumpctl @@ -1306,6 +1306,17 @@ get_default_crashkernel() echo -n "$(kdump_get_arch_recommend_crashkernel "$_dump_mode")" } +# Read kernel cmdline parameter for a specific kernel +# $1: kernel path, DEFAULT or kernel path, ALL not accepted +# $2: kernel cmldine parameter +get_grub_kernel_boot_parameter() +{ + local _kernel_path=$1 _para=$2 + + [[ $_kernel_path == ALL ]] && derror "kernel_path=ALL invalid for get_grub_kernel_boot_parameter" && return 1 + grubby --info="$_kernel_path" | sed -En -e "/^args=.*$/{s/^.*(\s|\")${_para}=(\S*).*\"$/\2/p;q}" +} + reset_crashkernel() { local kernel=$1 entry crashkernel_default -- 2.31.1