#!/bin/bash

# Calculate new config for ALT kernel based on stable kernel config.
# I.E. calculate miniconfig-alt-linux based on miniconfig-linux for a target.

# Expand miniconfig with the old kernel, copy .config to new kernel, run
# make oldconfig, compress to miniconfig, copy to sources/targets/$TARGET

source sources/include.sh

load_target $1
rmdir $STAGE_DIR

test -z $BOOT_KARCH && setglobal BOOT_KARCH = $KARCH

# Expand config against current kernel

setglobal USE_ALT = ''

getconfig linux > "$WORK/miniconfig-linux"

setupfor linux

make ARCH=$BOOT_KARCH $LINUX_FLAGS KCONFIG_ALLCONFIG="$WORK/miniconfig-linux" \
  allnoconfig >/dev/null &&
cp .config $WORK

cleanup

setglobal USE_ALT = 'linux'

setupfor linux

mv "$WORK/.config" . &&
yes "" | make ARCH="$BOOT_KARCH" oldconfig &&
mv .config walrus &&
env ARCH=$(BOOT_KARCH) "$SOURCES/toys/miniconfig.sh" walrus || dienow

setglobal CFG = ""$CONFIG_DIR/$ARCH_NAME/miniconfig-alt-linux""
if test -e $CFG && ! cmp mini.config $CFG
{
  mv $CFG "$(CFG).bak" || dienow
}
mv mini.config $CFG

cleanup

diff -u $[sort "$WORK/miniconfig-linux] $[sort $CFG] \
 | sed '/^ /d;/^@/d;1,2d' | tee "$WORK/mini.diff"