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init: improve kernel param parsing

We only set KOPT_* for the args we actually use and ignore the rest.

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -284,17 +284,28 @@

 # acpi_osi="!Windows 2006"

 eval set -- `cat /proc/cmdline`

-while [ $# -gt 0 ]; do

-	case "$1" in

-		s|single|1)

-			SINGLEMODE=yes ;;

-		console=*)

-			CONSOLE="$CONSOLE ${1#console=}";;

-		*=*)    eval "KOPT_${1%%=*}='${1#*=}'" ;;

-		no*)    eval "KOPT_$(echo ${1#no} | sed 's: :_:g')=no" ;;

-		*)      eval "KOPT_$(echo $1 | sed 's: :_:g')=yes" ;;

+myopts="alpine_dev autodetect autoraid chart cryptroot debug_init dma init_args

+	keep_apk_new modules ovl_dev pkgs quiet root_size root usbdelay"

+

+for opt; do

+	case "$opt" in

+	s|single|1)

+		SINGLEMODE=yes

+		continue

+		;;

+	console=*)

+		CONSOLE="$CONSOLE ${opt#console=}"

+		continue

+		;;

 	esac

-	shift

+

+	for i in $myopts; do

+		case "$opt" in

+		$i=*)	eval "KOPT_${i}='${opt#*=}'";;

+		$i)	eval "KOPT_${i}=yes";;

+		no$i)	eval "KOPT_${i}=no";;

+		esac

+	done

 done

 # enable debugging if requested