kbuild: handle non-existing options in scripts/config

If an option does not exist in .config, set it at the end of the file.

Signed-off-by: Michal Marek <mmarek@suse.cz>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

diff --git a/scripts/config b/scripts/config
index db6084b..30825a5 100755 (executable)
--- a/scripts/config
+++ b/scripts/config
@@ -26,8 +26,6 @@ options:
 
 config doesn't check the validity of the .config file. This is done at next
  make time.
-The options need to be already in the file before they can be changed,
-but sometimes you can cheat with the --*-after options.
 EOL
        exit 1
 }
@@ -45,8 +43,18 @@ checkarg() {
        ARG="`echo $ARG | tr a-z A-Z`"
 }
 
-replace() {
-       sed -i -e "$@" $FN
+set_var() {
+       local name=$1 new=$2 before=$3
+
+       name_re="^($name=|# $name is not set)"
+       before_re="^($before=|# $before is not set)"
+       if test -n "$before" && grep -Eq "$before_re" "$FN"; then
+               sed -ri "/$before_re/a $new" "$FN"
+       elif grep -Eq "$name_re" "$FN"; then
+               sed -ri "s:$name_re.*:$new:" "$FN"
+       else
+               echo "$new" >>"$FN"
+       fi
 }
 
 if [ "$1" = "--file" ]; then
@@ -70,20 +78,19 @@ while [ "$1" != "" ] ; do
        case "$CMD" in
        --enable|-e)
                checkarg "$1"
-               replace "s/# CONFIG_$ARG is not set/CONFIG_$ARG=y/"
+               set_var "CONFIG_$ARG" "CONFIG_$ARG=y"
                shift
                ;;
 
        --disable|-d)
                checkarg "$1"
-               replace "s/CONFIG_$ARG=[my]/# CONFIG_$ARG is not set/"
+               set_var "CONFIG_$ARG" "# CONFIG_$ARG is not set"
                shift
                ;;
 
        --module|-m)
                checkarg "$1"
-               replace "s/CONFIG_$ARG=y/CONFIG_$ARG=m/" \
-                       -e "s/# CONFIG_$ARG is not set/CONFIG_$ARG=m/"
+               set_var "CONFIG_$ARG" "CONFIG_$ARG=m"
                shift
                ;;
 
@@ -109,9 +116,7 @@ while [ "$1" != "" ] ; do
                A=$ARG
                checkarg "$2"
                B=$ARG
-               replace "/CONFIG_$A=[my]/aCONFIG_$B=y" \
-                       -e "/# CONFIG_$ARG is not set/a/CONFIG_$ARG=y" \
-                       -e "s/# CONFIG_$ARG is not set/CONFIG_$ARG=y/"
+               set_var "CONFIG_$B" "CONFIG_$B=y" "CONFIG_$A"
                shift
                shift
                ;;
@@ -121,9 +126,7 @@ while [ "$1" != "" ] ; do
                A=$ARG
                checkarg "$2"
                B=$ARG
-               replace "/CONFIG_$A=[my]/a# CONFIG_$B is not set" \
-               -e "/# CONFIG_$ARG is not set/a/# CONFIG_$ARG is not set" \
-               -e "s/CONFIG_$ARG=[my]/# CONFIG_$ARG is not set/"
+               set_var "CONFIG_$B" "# CONFIG_$B is not set" "CONFIG_$A"
                shift
                shift
                ;;
@@ -133,10 +136,7 @@ while [ "$1" != "" ] ; do
                A=$ARG
                checkarg "$2"
                B=$ARG
-               replace "/CONFIG_$A=[my]/aCONFIG_$B=m" \
-                       -e "/# CONFIG_$ARG is not set/a/CONFIG_$ARG=m" \
-                       -e "s/CONFIG_$ARG=y/CONFIG_$ARG=m/" \
-                       -e "s/# CONFIG_$ARG is not set/CONFIG_$ARG=m/"
+               set_var "CONFIG_$B" "CONFIG_$B=m" "CONFIG_$A"
                shift
                shift
                ;;