make_uInitrd.sh

#!/bin/bash

set -e

# prep
C=$(id | grep -c "(root)" || true)
if [ "$C" != 1 ] ; then
    echo "please re-run as root" >&2
    exit 1
fi
C=$(apt-get --just-print upgrade | grep -cP "^Inst " || true)
if [ "$C" -gt 0 ] ; then
    apt-get update -y
    apt-get upgrade -y
    apt-get dist-upgrade -y
    echo "Please re-run after reboot."
    echo "Reboot now? [y|n]"
    read -r YN
    if [ "$YN" == "y" ] ; then
        reboot
    else
        exit 1
    fi
fi
apt-get install -y \
    git autoconf automake autopoint libtool pkg-config \
    libudev-dev libdevmapper-dev flex bison gettext \
    intltool libgcrypt20-dev \
    gperf libcap-dev libblkid-dev libmount-dev \
    xsltproc docbook-xsl docbook-xml python-lxml \
    libncurses5-dev libncursesw5-dev \
    libdw-dev libgpgme-dev
cd /home/odroid
mkdir -p ramdisk_petitboot
cd ramdisk_petitboot

if [ ! -d systemd ] ; then
    git clone --depth 1 git://anongit.freedesktop.org/systemd/systemd
    (
    cd systemd
        ./autogen.sh
        mkdir build
        (
            cd build
            ../configure --prefix=/usr --enable-blkid --disable-seccomp --disable-libcurl --disable-pam --disable-kmod
            make -j "$(nproc)"
        )
    )
fi

if [ ! -d kexec-tools ] ; then
    git clone --depth 1 git://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git
    (
        cd kexec-tools
        ./bootstrap
        ./configure --prefix=/usr
        make -j "$(nproc)"
    )
fi

if [ ! -d libtwin ] ; then
     git clone --depth 1 git://git.kernel.org/pub/scm/linux/kernel/git/geoff/libtwin.git
     (
         cd libtwin
         ./autogen.sh
         make
         make install
     )
fi


if [ ! -d petitboot ] ; then
    git clone --depth 1 -b petitboot-1.6.x https://github.com/open-power/petitboot.git
    (
        cd petitboot
        ./bootstrap
        ./configure --with-twin-x11=no --with-twin-fbdev=no --with-signed-boot=no --disable-nls
        make -j "$(nproc)"
    )
fi

if [ ! -d busybox ] ; then
    git clone  --depth 1 git://git.busybox.net/busybox
    (
        cd busybox
        make defconfig
        LDFLAGS=--static make -j "$(nproc)"
    )
fi

if [ ! -d initramfs ] ; then
    mkdir -p initramfs/{\
bin,\
sbin,\
etc,\
lib/aarch64-linux-gnu,\
proc,\
sys,\
newroot,\
usr/bin,\
usr/sbin,\
usr/lib/aarch64-linux-gnu,\
usr/lib/udev/rules.d,\
usr/local/sbin,\
usr/share/udhcpc,\
var/log/petitboot,run,\
run/udev,\
tmp}
    touch initramfs/etc/mdev.conf
    cp -Rp /lib/terminfo initramfs/lib/
    cp -Rp busybox/busybox initramfs/bin/
    ln -s busybox initramfs/bin/sh
    cp -L /lib/aarch64-linux-gnu/{\
libc.so.*,\
libm.so.*,\
libdl.so.*,\
librt.so.*,\
libacl.so.*,\
libcap.so.*,\
libattr.so.*,\
libpthread.so.*,\
libncurses.so.*,\
libncursesw.so.*,\
libtinfo.so.*,\
libpcre.so.*,\
libresolv.so.*,\
libselinux.so.*,\
libreadline.so.*,\
libgcc_s.so.*,\
libblkid.so.*,\
libkmod.so.*,\
libuuid.so.*,\
libusb-1.0.so.*,\
libdevmapper.so.*,\
libz.so.*,\
liblzma.so.*,\
libbz2.so.*,\
libgpg-error.so.*,\
libnss_files.so.*} initramfs/lib/aarch64-linux-gnu/ 
    cp -L /lib/ld-linux-aarch64.so.* initramfs/lib/
    cp -L /usr/lib/aarch64-linux-gnu/{\
libform.so.*,\
libformw.so.*,\
libmenu.so.*,\
libmenuw.so.*,\
libelf.so.*,\
libdw.so.*,\
libgpgme.so.*,\
libassuan.so.*} initramfs/usr/lib/aarch64-linux-gnu/
    cp -Rp /usr/bin/gpg initramfs/usr/bin/
    cp systemd/build/.libs/libudev.so.* initramfs/lib/aarch64-linux-gnu/
    cp -Rp systemd/build/{systemd-udevd,udevadm} initramfs/sbin/
    cp -Rp systemd/build/*_id initramfs/usr/lib/udev/
    cp -Rp kexec-tools/build/sbin/kexec initramfs/sbin/
    cp -Rp systemd/{rules/*,build/rules/*} initramfs/usr/lib/udev/rules.d/
    rm -f initramfs/usr/lib/udev/rules.d/*-drivers.rules
    cp -Rp busybox/examples/udhcp/simple.script initramfs/usr/share/udhcpc/simple.script
    chmod 755 initramfs/usr/share/udhcpc/simple.script
    sed -i '/should be called from udhcpc/d' initramfs/usr/share/udhcpc/simple.script
    cat << EOF > initramfs/usr/share/udhcpc/default.script
#!/bin/sh

/usr/share/udhcpc/simple.script "\$@"
/usr/sbin/pb-udhcpc "\$@"
EOF
    chmod 755 initramfs/usr/share/udhcpc/default.script
    cat << EOF > initramfs/etc/nsswitch.conf
passwd:                files
group:                files
shadow:                files
hosts:                files
networks:        files
protocols:        files
services:        files
ethers:                files
rpc:                files
netgroup:        files
EOF
    cat << EOF > initramfs/etc/group
root:x:0:
daemon:x:1:
tty:x:5:
disk:x:6:
lp:x:7:
kmem:x:15:
dialout:x:20:
cdrom:x:24:
tape:x:26:
audio:x:29:
video:x:44:
input:x:122:
EOF
    cat << EOF > initramfs/init
#!/bin/sh

/bin/busybox --install -s

CURRENT_TIMESTAMP=\$(date '+%s')
if [ \$CURRENT_TIMESTAMP -lt \$(date '+%s') ]; then
        date -s "@\$(date '+%s')"
fi

mount -t proc proc /proc
mount -t sysfs sysfs /sys
mount -t devtmpfs none /dev
 
echo 0 > /proc/sys/kernel/printk
clear
 
systemd-udevd &
udevadm hwdb --update
udevadm trigger

pb-discover &
petitboot-nc
 
if [ -e /etc/pb-lockdown ] ; then
        echo "Failed to launch petitboot, rebooting!"
        echo 1 > /proc/sys/kernel/sysrq
        echo b > /proc/sysrq-trigger
else
        echo "Failed to launch petitboot, dropping to a shell"
        exec sh
fi
EOF
    chmod +x initramfs/init
    
fi

C=$(find initramfs/usr/sbin/ -type f | grep -c petitboot || true)
if [ "$C" -lt 1 ] ; then
    (
        cd petitboot
        make DESTDIR="$(realpath ../initramfs/)" install
    )
    strip initramfs/{sbin/*,lib/aarch64-linux-gnu/*,usr/lib/aarch64-linux-gnu/*,usr/lib/udev/*_id}
    cp initramfs/usr/local/sbin/* initramfs/usr/sbin/
fi

if [ ! -f initramfs.igz ] ; then
    (
        cd initramfs
        find . | cpio -H newc -o | lzma > ../initramfs.igz
    )
    mkimage -A arm64 -O linux -T ramdisk -C lzma -a 0 -e 0 -n uInitrd.igz -d initramfs.igz uInitrd.igz
fi

echo "Everything is OK."