[PATCH v3 05/13] add helper functions to get dump mode

Add a helper function to get dump mode. The dump mode would be - fadump if fadump=on or fadump=nocma - kdump if fadump=off or empty fadump Otherwise return 1. Also add another helper function to return a kernel's dump mode. Signed-off-by: Coiby Xu <coxu(a)redhat.com&gt; --- kdumpctl | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/kdumpctl b/kdumpctl index 7fc3a4d..c6046dc 100755 --- a/kdumpctl +++ b/kdumpctl @@ -1317,6 +1317,40 @@ get_grub_kernel_boot_parameter() grubby --info="$_kernel_path" | sed -En -e "/^args=.*$/{s/^.*(\s|\")${_para}=(\S*).*\"$/\2/p;q}" } +# get dump mode by fadump value +# return +# - fadump, if fadump=on or fadump=nocma +# - kdump, if fadump=off or empty fadump, return kdump +# - error if otherwise +get_dump_mode_by_fadump_val() +{ + local _fadump_val=$1 + + if [[ -z $_fadump_val ]] || [[ $_fadump_val == off ]]; then + echo -n kdump + elif [[ $_fadump_val == on ]] || [[ $_fadump_val == nocma ]]; then + echo -n fadump + else + derror "invalid fadump=$_fadump_val" + return 1 + fi +} + +# get dump mode of a specific kernel +# based on its fadump kernel cmdline parameter +get_dump_mode_by_kernel() +{ + local _kernel_path=$1 _fadump_val _dump_mode + + _fadump_val=$(get_grub_kernel_boot_parameter "$_kernel_path" fadump) + if _dump_mode=$(get_dump_mode_by_fadump_val "$_fadump_val"); then + echo -n "$_dump_mode" + else + derror "failed to get dump mode for kernel $_kernel_path" + exit + fi +} + reset_crashkernel() { local kernel=$1 entry crashkernel_default -- 2.31.1