From d5cf9132606a19d8135d7981edbb144bc01ae4e1 Mon Sep 17 00:00:00 2001
From: Coiby Xu <coxu@redhat.com>
Date: Jan 06 2022 03:55:25 +0000
Subject: add helper functions to get dump mode


Resolves: bz1895258
Upstream: Fedora
Conflict: None

commit 3d2079c31cd80741ea6d44eb7f13d7f08be74a94
Author: Coiby Xu <coxu@redhat.com>
Date:   Wed Dec 1 16:57:15 2021 +0800

    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.

    Reviewed-by: Pingfan Liu <piliu@redhat.com>
    Reviewed-by: Philipp Rudo <prudo@redhat.com>
    Signed-off-by: Coiby Xu <coxu@redhat.com>

Signed-off-by: Coiby Xu <coxu@redhat.com>

---

diff --git a/kdumpctl b/kdumpctl
index 85efaa1..89abad2 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