minimal-root.sh

#!/bin/bash

set -eE
trap 'echo Error: in $0 on line $LINENO' ERR

if [ "$(id -u)" -ne 0 ]; then
    echo "Please run as root"
    exit 1
fi

attach_MOUNTPOINT() {
    local MOUNTPOINT="$1"

    if [ ! -c /dev/mem ]; then
        mknod -m 660 /dev/mem c 1 1
        chown root:kmem /dev/mem
    fi

    mount dev-live -t devtmpfs "$MOUNTPOINT/dev"
    mount devpts-live -t devpts -o nodev,nosuid "$MOUNTPOINT/dev/pts"
    mount proc-live -t proc "$MOUNTPOINT/proc"
    mount sysfs-live -t sysfs "$MOUNTPOINT/sys"
    mount securityfs -t securityfs "$MOUNTPOINT/sys/kernel/security"

    mount -t cgroup2 none "$MOUNTPOINT/sys/fs/cgroup"
    mount -t tmpfs none "$MOUNTPOINT/tmp"
    mount -t tmpfs none "$MOUNTPOINT/var/lib/apt/lists"
    mount -t tmpfs none "$MOUNTPOINT/var/cache/apt"
}

detach_MOUNTPOINT() {
    # Reverse the operations from setup_MOUNTPOINT
    local MOUNTPOINT
    MOUNTPOINT=$(realpath "$1")

    # ensure we have exactly one trailing slash, and escape all slashes for awk
    MOUNTPOINT_match=$(echo "$MOUNTPOINT" | sed -e's,/$,,; s,/,\\/,g;')'\/'
    # sort -r ensures that deeper MOUNTPOINTs are unmounted first
    awk </proc/self/mounts "\$2 ~ /$MOUNTPOINT_match/ { print \$2 }" | LC_ALL=C sort -r | while IFS= read -r submount; do
        mount --make-private "$submount"
        umount "$submount"
    done
}


export RELASE_NAME="Ubuntu 24.10 (Oracular Oriole)"
export RELASE_VERSION="24.10"

export PROJECT=ubuntu-cpc
export SUITE=oracular
export FLAVOR=server

export ARCH=arm64
export IMAGEFORMAT=none
export IMAGE_TARGETS=none

export DEBIAN_FRONTEND=noninteractive
export DEBCONF_NONINTERACTIVE_SEEN=true
export LC_ALL=C
export LC_CTYPE=C
export LANGUAGE=C
export LANG=C

export SYSROOT=aarch64




# Create a stock root directory and populate it with debootstrap.
mkdir $SYSROOT
debootstrap --arch=$ARCH oracular $SYSROOT "http://ports.ubuntu.com/ubuntu-ports"

# Attach sysroot.
attach_MOUNTPOINT $SYSROOT

# Update, Upgrade, Add repositories.
chroot $SYSROOT apt update
chroot $SYSROOT apt -y upgrade
chroot $SYSROOT apt -y dist-upgrade
chroot $SYSROOT apt -y install apt-utils software-properties-common python3-launchpadlib
chroot $SYSROOT add-apt-repository -y universe                     # Solves some unmet dependencies.
chroot $SYSROOT add-apt-repository -y multiverse                   # This one as well.
chroot $SYSROOT apt-add-repository -y restricted                   # Yep, this one too.
chroot $SYSROOT add-apt-repository -y ppa:jjriek/rockchip          # We need Joshua's repo.
chroot $SYSROOT add-apt-repository -y ppa:oibaf/graphics-drivers   # We need the upstream mesa repo.
chroot $SYSROOT apt update
chroot $SYSROOT apt -y upgrade
chroot $SYSROOT apt -y install ubuntu-server-rockchip u-boot-orangepi-5-plus u-boot-tools u-boot-menu \
                               linux-firmware cloud-initramfs-growroot grub-efi-arm64 initramfs-tools

7z x linux-rockchip-6.13-rc6_arm64.zip -O$SYSROOT/tmp/kernel
chroot $SYSROOT /bin/bash -c "dpkg -i /tmp/kernel/linux-*6.13*.deb"

chroot $SYSROOT update-initramfs -u

# Get every things clean.
chroot $SYSROOT apt -y autoremove
chroot $SYSROOT apt autoclean
chroot $SYSROOT apt clean

# Detach the sysroot.
detach_MOUNTPOINT $SYSROOT

# Package the minimal sysroot.
(cd $SYSROOT &&  tar -p -c --sort=name --xattrs ./*) | xz -3 -T0 > "ubuntu-${RELASE_VERSION}-preinstalled-${FLAVOR}-arm64.rootfs.tar.xz"