disk image builder support ubuntu eoan

#!/bin/bash
# These are useful, or at worst not harmful, for all images we build.

if [ ${DIB_DEBUG_TRACE:-1} -gt 0 ]; then
    set -x
fi
set -eu
set -o pipefail

[ -n "$ARCH" ]
[ -n "$TARGET_ROOT" ]

shopt -s extglob

DIB_RELEASE=${DIB_RELEASE:-trusty}
DIB_CLOUD_IMAGES=${DIB_CLOUD_IMAGES:-http://cloud-images.ubuntu.com/$DIB_RELEASE/current}
#if [ $DIB_RELEASE == "eoan" ] ;then
#    BASE_IMAGE_FILE=${BASE_IMAGE_FILE:-$DIB_RELEASE-server-cloudimg-$ARCH.squashfs}
if [ $DIB_RELEASE != "trusty" ] && [ $DIB_RELEASE != "xenial" ]; then
    BASE_IMAGE_FILE=${BASE_IMAGE_FILE:-$DIB_RELEASE-server-cloudimg-$ARCH.squashfs}
else
    BASE_IMAGE_FILE=${BASE_IMAGE_FILE:-$DIB_RELEASE-server-cloudimg-$ARCH-root.tar.gz}
fi
SHA256SUMS=${SHA256SUMS:-https://${DIB_CLOUD_IMAGES##http?(s)://}/SHA256SUMS}
CACHED_FILE=$DIB_IMAGE_CACHE/$BASE_IMAGE_FILE
CACHED_FILE_LOCK=$DIB_LOCKFILES/$BASE_IMAGE_FILE.lock
CACHED_SUMS=$DIB_IMAGE_CACHE/SHA256SUMS.ubuntu.$DIB_RELEASE.$ARCH
function set_pip()
{

    root=$TARGET_ROOT
    mkdir -p  $root/home/root/.pip
    touch $root/home/root/.pip/pip.conf
cat << EOF > $root/home/root/.pip/pip.conf
[global]
trusted-host =  pypi.douban.com
index-url = http://pypi.douban.com/simple
EOF
   cat $root/home/root/.pip/pip.conf
}
function get_ubuntu_tarball() {
    # Extract the base image (use --numeric-owner to avoid UID/GID mismatch between
    # image tarball and host OS e.g. when building Ubuntu image on an openSUSE host)
    #if [ $DIB_RELEASE == "eoan" ];then
    #    sudo unsquashfs -f -d $TARGET_ROOT $DIB_IMAGE_CACHE/$BASE_IMAGE_FILE
    #    #sudo tar -C $TARGET_ROOT --numeric-owner -xzf $DIB_IMAGE_CACHE/$BASE_IMAGE_FILE
    if [ $DIB_RELEASE != "trusty" ] && [ $DIB_RELEASE != "xenial" ]; then
        sudo unsquashfs -f -d $TARGET_ROOT $DIB_IMAGE_CACHE/$BASE_IMAGE_FILE
        sed -i "s/ports.ubuntu.com/mirror.tuna.tsinghua.edu.cn/g" $TARGET_ROOT/etc/apt/sources.list
        #sed -i "s/ports.ubuntu.com/ubuntu-ports/mirrors.aliyun.com/ubuntu/g" $TARGET_ROOT/etc/apt/sources.list
    else
        sudo tar -C $TARGET_ROOT --numeric-owner -xzf $DIB_IMAGE_CACHE/$BASE_IMAGE_FILE
    fi
}

(
    echo "Getting $CACHED_FILE_LOCK: $(date)"
    # Wait up to 20 minutes for another process to download
    if ! flock -w 1200 9 ; then
        echo "Did not get $CACHED_FILE_LOCK: $(date)"
        exit 1
    fi
    get_ubuntu_tarball
) 9> $CACHED_FILE_LOCK