#! /bin/bash

# Copyright (C) 2011 GRNET S.A. 
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.

### BEGIN TASK INFO
# Provides:		AssignHostname
# RunBefore:            EnforcePersonality
# RunAfter:		InstallUnattend
# Short-Description:	Assign Hostname/Computer Name to the instance
### END TASK INFO

set -e
. "@commondir@/common.sh"

trap task_cleanup EXIT
report_task_start

# Check if the task should be prevented from running.
check_if_excluded

windows_hostname() {
    local target password unattend tmp_unattend namespace
    target="$1"
    password="$2"

    tmp_unattend=$(mktemp)
    add_cleanup rm "$tmp_unattend"

    echo -n "Assigning new computer name..."

    namespace="urn:schemas-microsoft-com:unattend"

    unattend=$(get_unattend "$target")
    if [ -z "$unattend" ]; then
        log_error "Unattend.xml is missing."
    fi
    
    "$XMLSTARLET" ed -N x=$namespace -u "/x:unattend/x:settings/x:component/x:ComputerName" -v "$password" "$unattend" > "$tmp_unattend"

    cat "$tmp_unattend" > "$unattend"
    echo done
}

linux_hostname() {
    local target hostname distro
    target="$1"
    hostname="$2"

    if [ -f "$target/etc/hostname" ]; then
        echo "$hostname" > "$target/etc/hostname"
    else
        distro=$(get_base_distro "$target")
        case "$distro" in
            redhat)
                sed -ie "s/HOSTNAME=.*$/HOSTNAME=$hostname/g" "$target/etc/sysconfig/network";;
            slackware|suse)
                #local domain=$(sed -e 's/^[^\.]*//g' < /etc/HOSTNAME)

                # In slackware hostname and domain name are joined together. For now
                # I will not retain the domain name.
                echo "$hostname" > "${target}/etc/HOSTNAME";;
            gentoo)
                sed -ie "s/\(\(HOSTNAME\)\|\(hostname\)\)=.*$/\1=\"$hostname\"/" "$target/etc/conf.d/hostname";;
            arch)
                if [ -f "$target/etc/rc.conf" ]; then
                    sed -ie "s/^HOSTNAME=.*$/HOSTNAME=\"$hostname\"/" "$target/etc/rc.conf"
                else
                    # In new versions of arch, /etc/rc.conf is missing
                    echo "$hostname" > "$target/etc/hostname"
                fi

                if grep "^127\.0\.0\.1[ \t]*" "$target/etc/hosts" > /dev/null; then
                   sed -ie "s/127\.0\.0\.1[ \t]*.*$/127.0.0.1\t$hostname/" "$target/etc/hosts"
                else
                   echo -e "127.0.0.1\t$hostname" >> "$target/etc/hosts"
                fi;;
            *) log_error "Don't know how to assign hostname. Unknown linux distribution.";;
        esac
    fi

    # Some Linux distributions assign the hostname to 127.0.1.1 in order to be
    # resolvable to an IP address. Lets replace this if found in /etc/hosts
    sed -ie "s/^[[:blank:]]*127\.0\.1\.1[[:blank:]].\+$/127.0.1.1\t$hostname/" "$target/etc/hosts"
}

if [ ! -d "$SNF_IMAGE_TARGET" ]; then
    log_error "Target dir: \`$SNF_IMAGE_TARGET' is missing"	
fi

if [ -z "$SNF_IMAGE_HOSTNAME" ]; then
    log_error "Hostname is missing"
fi

if [ "$SNF_IMAGE_PROPERTY_OSFAMILY" = "windows" ]; then
    windows_hostname "$SNF_IMAGE_TARGET" "$SNF_IMAGE_HOSTNAME"
elif [ "$SNF_IMAGE_PROPERTY_OSFAMILY" = "linux" ]; then
    linux_hostname "$SNF_IMAGE_TARGET" "$SNF_IMAGE_HOSTNAME"
fi

exit 0

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