mkimage_vyos.sh

mkimage_vyos.sh

#!/bin/bash

# You need to install overlayroot
# sudo apt-get install overlayroot

LANG=C

set -e
set -x

docker_user=$(docker info | grep Username | awk '{print $2}')
tag="$docker_user/vyos"
vyos_iso_url=$1
vyos_iso_local=/tmp/vyos.iso
so3group_key_url=https://downloads.vyos.io/vyos-release.gpg
so3group_key_local=/tmp/so3group_maintainers.key

CD_ROOT=/tmp/cdrom
CD_SQUASH_ROOT=/tmp/cdsquash
SQUASHFS_IMAGE="${CD_ROOT}/live/filesystem.squashfs"

WRITE_ROOT=/tmp/wroot
READ_ROOT=/tmp/squashfs
INSTALL_ROOT=/tmp/inst_root

# Create directories
mkdir -p ${CD_ROOT}
mkdir -p ${CD_SQUASH_ROOT}
mkdir -p ${WRITE_ROOT}
mkdir -p ${READ_ROOT}
mkdir -p ${INSTALL_ROOT}

# ---- Set up the specified ISO release ----
# Download VyOS ISO release
curl ${vyos_iso_url} -o ${vyos_iso_local}

# Fetch VyOS ISO GPG signature
curl ${vyos_iso_url}.asc -o ${vyos_iso_local}.asc

# Fetch SO3 Group GPG key
curl ${so3group_key_url} -o ${so3group_key_local}

# Install SO3 Group GPG key
gpg --import ${so3group_key_local}

# Validate ISO GPG signature
gpg --verify ${vyos_iso_local}.asc ${vyos_iso_local}

# Mount ISO
sudo mount -o loop -t iso9660 ${vyos_iso_local} ${CD_ROOT}

# Verify checksums of all the files in the ISO image
pushd ${CD_ROOT}
md5sum -c md5sum.txt
popd

# Mount squashfs image from ISO
sudo mount -o loop -t squashfs ${SQUASHFS_IMAGE} ${CD_SQUASH_ROOT}

# Read version string from iso packages
version_string=$(cat ${CD_ROOT}/live/filesystem.packages | grep ^vyatta-version | awk '{print $2}')

# Debug version string as read from ISO
echo "This is version ${version_string}"

# ---- Install image from ISO ----
# Create {{ WRITE_ROOT }} directories
RW_DIR=${WRITE_ROOT}/boot/${version_string}/live-rw
mkdir -p ${RW_DIR}

# Copy squashfs image from ISO to root partition
cp -p ${SQUASHFS_IMAGE} ${WRITE_ROOT}/boot/${version_string}/${version_string}.squashfs

# Copy boot files (kernel and initrd images) from ISO to root partition
find ${CD_SQUASH_ROOT}/boot -maxdepth 1  \( -type f -o -type l \) -exec cp -dp {} ${WRITE_ROOT}/boot/${version_string}/ \;

# Mount squashfs image from root partition
sudo mount -o loop -t squashfs ${WRITE_ROOT}/boot/${version_string}/${version_string}.squashfs ${READ_ROOT}

# Copy all files to installation directory
sudo cp -pr ${READ_ROOT}/* ${INSTALL_ROOT}/

## ---- VyOS configuration ----
# Make sure that config partition marker exists
sudo touch ${INSTALL_ROOT}/opt/vyatta/etc/config/.vyatta_config

# Copy default config file to config directory
sudo chroot --userspec=root:vyattacfg ${INSTALL_ROOT} cp /opt/vyatta/etc/config.boot.default /opt/vyatta/etc/config/config.boot

# Change permissions on the new config file
sudo chmod 755 ${INSTALL_ROOT}/opt/vyatta/etc/config/config.boot

# Add interface eth0 and set address to dhcp
sudo sed -i '/interfaces {/ a    ethernet eth0 {\n        address dhcp\n    }' ${INSTALL_ROOT}/opt/vyatta/etc/config/config.boot

# Remove Linux Kernel
LINUX_IMAGE=$(sudo chroot ${INSTALL_ROOT} dpkg -l | grep linux-image | awk '{print $2}')
sudo chroot ${INSTALL_ROOT} apt-get -y remove --purge linux-firmware ${LINUX_IMAGE}
sudo chroot ${INSTALL_ROOT} rm -rf lib/modules/*

suite=$(sudo chroot ${INSTALL_ROOT} cat /opt/vyatta/etc/version | grep Description | awk '{print $4}' | sed 's/(//' | sed 's/)//')

# Generate Docker image
dir="$(mktemp -d ${TMPDIR:-/var/tmp}/docker-mkimage.XXXXXXXXXX)"
rootfsDir=$INSTALL_ROOT
tarFile="$dir/rootfs.tar.xz"
touch "$tarFile"
sudo tar --numeric-owner -Jcaf "$tarFile" -C "$rootfsDir" --transform='s,^./,,' .
echo >&2 "+ cat > '$dir/Dockerfile'"
cat > "$dir/Dockerfile" <<'EOF'
FROM scratch
ADD rootfs.tar.xz /
CMD ["/sbin/init"]
EOF
docker build -t "$tag" "$dir"
docker tag $tag:latest $tag:$version_string
docker tag $tag:latest $tag:$suite

echo "Cleanup"
sudo umount ${READ_ROOT}
sudo umount ${CD_SQUASH_ROOT}
sudo umount ${CD_ROOT}
sudo rm -rf ${READ_ROOT}
sudo rm -rf ${CD_SQUASH_ROOT}
sudo rm -rf ${CD_ROOT}
sudo rm -rf ${WRITE_ROOT}
sudo rm -rf ${INST_ROOT}
sudo rm -rf $dir