#!/bin/bash

. ../.config

INITRAMFS=/tmp/$LIVEKITNAME-initramfs-$$

# copy file to initramfs tree, including
# all library dependencies (as shown by ldd)
# $1 = file to copy (full path)
copy_including_deps()
{
   # if source doesn't exist or target exists, do nothing
   if [ ! -e "$1" -o -e "$INITRAMFS"/"$1" ]; then
      return
   fi

   cp -R --parents "$1" "$INITRAMFS"
   if [ -L "$1" ]; then
      DIR="$(dirname "$1")"
      LNK="$(readlink "$1")"
      copy_including_deps "$(cd "$DIR"; realpath -s "$LNK")"
   fi

   ldd "$1" 2>/dev/null | sed -r "s/.*=>|[(].*//g" | sed -r "s/^\\s+|\\s+\$//" \
     | while read LIB; do
        copy_including_deps "$LIB"
     done

   shift
   if [ "$1" != "" ]; then
       copy_including_deps "$@"
   fi
}

rm -Rf $INITRAMFS
mkdir -p $INITRAMFS/{bin,dev,etc,lib,lib64,mnt,proc,root,run,sbin,sys,tmp,usr,var/log}

cd static
./update
cd ..

cp static/{busybox,mount.ntfs-3g} $INITRAMFS/bin
chmod a+x $INITRAMFS/bin/{busybox,mount.ntfs-3g}

$INITRAMFS/bin/busybox | grep , | grep -v Copyright | tr "," " " | while read LINE; do
   for TOOL in $LINE; do
      ln -s busybox $INITRAMFS/bin/$TOOL
      ln -s ../bin/busybox $INITRAMFS/sbin/$TOOL
   done
done
rm $INITRAMFS/{s,}bin/init

mknod $INITRAMFS/dev/console c 5 1
mknod $INITRAMFS/dev/null c 1 3
mknod $INITRAMFS/dev/ram0 b 1 0
mknod $INITRAMFS/dev/tty1 c 4 1
mknod $INITRAMFS/dev/tty2 c 4 2
mknod $INITRAMFS/dev/tty3 c 4 3
mknod $INITRAMFS/dev/tty4 c 4 4

#copy_including_deps /usr/bin/strace
#copy_including_deps /usr/bin/lsof

# TODO: add all comon filesystems which are NOT compiled in kernel already
copy_including_deps /$LMK/kernel/fs/squashfs
copy_including_deps /$LMK/kernel/drivers/staging/zram
copy_including_deps /$LMK/kernel/drivers/block/loop.*
copy_including_deps /$LMK/modules.*

depmod -b $INITRAMFS

echo "root::0:0::/root:/bin/bash" >$INITRAMFS/etc/passwd
touch $INITRAMFS/etc/{m,fs}tab

cp init $INITRAMFS
chmod a+x $INITRAMFS/init
cp cleanup $INITRAMFS/lib
chmod a+x $INITRAMFS/lib/cleanup
ln -s ../init $INITRAMFS/bin/init
ln -s ../init $INITRAMFS/sbin/init
cp ../livekitlib $INITRAMFS/lib/
cp ../.config $INITRAMFS/lib/

cd $INITRAMFS
find . -print | cpio -o -H newc 2>/dev/null | gzip -f --best >$INITRAMFS.img
echo $INITRAMFS.img

cd ..
rm -Rf $INITRAMFS