#!/bin/sh

# find D-Bus session bus addresses
dbus_addr="$DBUS_SESSION_BUS_ADDRESS"
if [ -z "$dbus_addr" ]; then
    machine_id="$(cat /etc/machine-id 2>/dev/null)"
    display_num="${DISPLAY#*:}"
    display_num="${display_num%.*}"
    if [ -n "$machine_id" ] && [ -n "$display_num" ]; then
        file="$HOME/.dbus/session-bus/$machine_id-$display_num"
        dbus_addr="$(grep -m 1 '^DBUS_SESSION_BUS_ADDRESS=' "$file")"
        dbus_addr="${dbus_addr#DBUS_SESSION_BUS_ADDRESS=}"
    fi
fi

# check if the addresses contain a normal (non-abstract) unix domain
# socket transport
has_normal_unix_transport () {
    local IFS
    IFS=';'
    for addr in $dbus_addr; do
        case "$addr" in
            unix:path=*|unix:*,path=*)
                return 0 ;;
        esac
    done
    return 1
}

# don't start the proxy if there is no d-bus address or if there is a
# normal unix transport, which works fine without a proxy
if [ -n "$dbus_addr" ] && ! has_normal_unix_transport; then
    # find abstract unix transport
    IFS=';'
    for addr in $dbus_addr; do
        case "$addr" in
            unix:abstract=*|unix:*,abstract=*)
                # parse address, get socket name and guid
                name=
                guid_opt=
                IFS=','
                for part in ${addr#unix:}; do
                    case "$part" in
                        abstract=*)
                            name="${part#abstract=}" ;;
                        guid=*)
                            guid_opt=",$part" ;;
                    esac
                done

                if [ -n "$name" ]; then
                    # start proxy and kill it when shell exits
                    proxy_path="/tmp/dbus-proxy-$$"
                    socat UNIX-LISTEN:"$proxy_path",fork ABSTRACT-CONNECT:"$name" &
                    trap "kill -TERM $! && wait" 0
                    export DBUS_SESSION_BUS_ADDRESS="unix:path=$proxy_path$guid_opt"
                fi
                break
                ;;
        esac
    done
fi


netns-exec "$@"