From 37de94d02a647263b27ad6fcc5bd30e7cf1a3def Mon Sep 17 00:00:00 2001
From: Pingfan Liu <piliu@redhat.com>
Date: Tue, 13 Jun 2023 17:43:20 +0800
Subject: [PATCH] kdump-lib: Introduce a help function _crashkernel_add()

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2160676
Upstream: Fedora rawhide
Conflict: Drop shellspec test case

commit 51efbcf83e26a69fb56466a580b50e5d4867509f
Author: Pingfan Liu <piliu@redhat.com>
Date:   Tue Jun 13 17:43:20 2023 +0800

    kdump-lib: Introduce a help function _crashkernel_add()

    This help function can manipulate the crashkernel cmdline by adding an
    number for each item. Also a basic test case for _crashkernel_add() is
    provided in this patch.

    Credit to Philipp, who contributes the original code.

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

Signed-off-by: Pingfan Liu <piliu@redhat.com>
---
 kdump-lib.sh | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/kdump-lib.sh b/kdump-lib.sh
index 75d55f5..6009360 100755
--- a/kdump-lib.sh
+++ b/kdump-lib.sh
@@ -904,6 +904,64 @@ get_recommend_size()
 	echo "0M"
 }
 
+# $1 crashkernel=""
+# $2 delta in unit of MB
+_crashkernel_add()
+{
+	local _ck _add _entry _ret
+	local _range _size _offset
+
+	_ck="$1"
+	_add="$2"
+	_ret=""
+
+	if [[ "$_ck" == *@* ]]; then
+		_offset="@${_ck##*@}"
+		_ck=${_ck%@*}
+	elif [[ "$_ck" == *,high ]] || [[ "$_ck" == *,low ]]; then
+		_offset=",${_ck##*,}"
+		_ck=${_ck%,*}
+	else
+		_offset=''
+	fi
+
+	while read -d , -r _entry; do
+		[[ -n "$_entry" ]] || continue
+		if [[ "$_entry" == *:* ]]; then
+			_range=${_entry%:*}
+			_size=${_entry#*:}
+		else
+			_range=""
+			_size=${_entry}
+		fi
+
+		case "${_size: -1}" in
+			K)
+				_size=${_size::-1}
+				_size="$((_size + (_add * 1024)))K"
+				;;
+			M)
+				_size=${_size::-1}
+				_size="$((_size + _add))M"
+				;;
+			G)
+				_size=${_size::-1}
+				_size="$((_size * 1024 + _add))M"
+				;;
+			*)
+				_size="$((_size + (_add * 1024 * 1024)))"
+				;;
+		esac
+
+		[[ -n "$_range" ]] && _ret+="$_range:"
+		_ret+="$_size,"
+	done <<< "$_ck,"
+
+	_ret=${_ret%,}
+	[[ -n "$_offset" ]] && _ret+=$_offset
+	echo "$_ret"
+}
+
 # get default crashkernel
 # $1 dump mode, if not specified, dump_mode will be judged by is_fadump_capable
 kdump_get_arch_recommend_crashkernel()