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#!/bin/bash

# only for debug
#DEBUG=1

PREFIX=""
[ "$DEBUG" = "1" ] && PREFIX=/tmp/debug-80_xds

# install required tools for XDS

XDS_BINDIR=${PREFIX}/usr/local/bin
XDS_WWWDIR=${PREFIX}/var/www/xds-server
XDS_CONFDIR=${PREFIX}/${DEVUSER_HOME}/.xds
SDK_INSTALL_DIR=${PREFIX}/xdt/sdk

curdir=`pwd`

## Install Go 1.8 to build xds
GOSRC=${PREFIX}/tmp/xds/src
export GOINSTALLDIR=${PREFIX}/tmp/xds/go/install/go1.8.3

if [ ! -x ${GOINSTALLDIR}/go/bin/go ]; then
    mkdir -p ${GOINSTALLDIR}
    mkdir -p ${PREFIX}/tmp
    GO_TARBALL=${PREFIX}/tmp/go1.8.3.linux-amd64.tar.gz
    wget -O ${GO_TARBALL} https://storage.googleapis.com/golang/go1.8.3.linux-amd64.tar.gz
    (cd ${GOINSTALLDIR} && tar zxf ${GO_TARBALL})
fi

export GOROOT=${GOINSTALLDIR}/go
export GOPATH=${PREFIX}/tmp/xds
export PATH=${GOROOT}/bin:${GOPATH}/bin:${PATH}

mkdir -p ${GOPATH}/{src,bin,pkg}

## Build and install XDS server and XDS tools (eg. Syncthing)
url="https://github.com/iotbzh/xds-server" \
    && mkdir -p ${GOSRC}/github.com/iotbzh && cd ${GOSRC}/github.com/iotbzh \
    && git clone "${url}" \
    && cd xds-server \
    && INSTALL_DIR="${XDS_BINDIR}" INSTALL_WEBAPP_DIR="${XDS_WWWDIR}" make all install \
    && mkdir -p ${XDS_CONFDIR} \
    && cat <<EOF >${XDS_CONFDIR}/config.json
{
    "webAppDir": "${XDS_WWWDIR}",
    "shareRootDir": "${XDS_CONFDIR}/projects",
    "sdkRootDir": "${SDK_INSTALL_DIR}",
    "syncthing": {
        "home": "${XDS_CONFDIR}/syncthing-config",
        "gui-address": "http://localhost:8384"
    }
}
EOF

# Change owner of created files
chown -R ${DEVUSER}:${DEVUSER_UID} ${XDS_CONFDIR}
# Change owner of webapp assets files (allow dynamic download of xds-agent tarballs)
chown -R ${DEVUSER}:${DEVUSER_UID} ${XDS_WWWDIR}/assets


if [ "$DEBUG" != "1" ]; then

    # generate service file for startup
    SERVFILE=/lib/systemd/system/xds-server.service
    cat <<EOF >$SERVFILE
[Unit]
Description=XDS Server

[Service]
User=${DEVUSER}
Type=forking
EnvironmentFile=-/etc/default/xds-server
ExecStart=/usr/local/bin/xds-server-start.sh

[Install]
WantedBy=multi-user.target
EOF

    # config file
    cat <<EOF >/etc/default/xds-server
# defaults file for XDS Server
# this file is used for service environment in $SERVFILE

# no variable defined yet
EOF

    # install service
    ln -s $SERVFILE /etc/systemd/system/multi-user.target.wants/

    # cleanup (remove build tools)
    cd $curdir
    rm -rf ${PREFIX}/tmp/xds ${PREFIX}/tmp/go*
fi