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#!/bin/bash
if test $(id -u) -ne 0; then
SUDO=sudo
fi
set -e
BUSYBOX=busybox-1.36.1
INITRD=$PWD/initramfs.cpio.gz
## Build busybox
echo "[+] configure & build $BUSYBOX ..."
[[ ! -d $BUSYBOX ]] && {
wget https://busybox.net/downloads/$BUSYBOX.tar.bz2
bunzip2 $BUSYBOX.tar.bz2 && tar xf $BUSYBOX.tar
}
cd $BUSYBOX
make defconfig
sed -i 's/# CONFIG_STATIC .*/CONFIG_STATIC=y/' .config
make -j$(nproc --ignore=2) busybox
make install
## Create initrd
echo "[+] create initrd $INITRD ..."
cd _install
# 1. create initrd folder structure
mkdir -p bin sbin etc proc sys usr/bin usr/sbin dev
# 2. create init process
cat <<EOF > init
#!/bin/sh
mount -t proc none /proc
mount -t sysfs none /sys
mount -t devtmpfs none /dev
exec setsid cttyhack sh
EOF
chmod +x init
# 3. created compressed initrd
find . -print0 \
| cpio --null -ov --format=newc \
| gzip -9 > $INITRD
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