#!/bin/sh -e
#
# 2014-2017 Steven Armstrong (steven-cdist at armstrong.cc)
# 2014 Nico Schottelius (nico-cdist at schottelius.org)
# 2019 Dennis Camera (dennis.camera at ssrq-sds-fds.ch)
#
# This file is part of cdist.
#
# cdist 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 3 of the License, or
# (at your option) any later version.
#
# cdist 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 cdist. If not, see <http://www.gnu.org/licenses/>.
#

os=$(cat "$__global/explorer/os")
name_running=$(cat "$__global/explorer/hostname")
name_config=$(cat "$__object/explorer/persistent_hostname")
has_hostnamectl=$(cat "$__object/explorer/has_hostnamectl")


if [ -f "$__object/parameter/name" ]; then
    name_should="$(cat "$__object/parameter/name")"
else
    case $os in
        # RedHat-derivatives and BSDs
        centos|fedora|redhat|scientific|freebsd|netbsd|openbsd)
            # Hostname is FQDN
            name_should="${__target_host}"
        ;;
        *)
            # Hostname is only first component of FQDN
            name_should="${__target_host%%.*}"
        ;;
    esac
fi

################################################################################
# Check if the hostname is already correct
#
if [ "$name_running" = "$name_should" ] && [ ! "$name_config" -o "$name_config" = "$name_should" ]; then
    exit 0
fi

################################################################################
# Setup hostname
#
echo changed >> "$__messages_out"


# First try to set the hostname using hostnamectl, if available.
if [ "$has_hostnamectl" ]; then
    # Allow hostnamectl to fail silently.
    # Who the fuck invented a tool that needs dbus to set the hostname anyway ...

    cat <<EOF
if hostnamectl set-hostname '$name_should'; then
    printf '%s\\n' '$name_should' > /etc/hostname
    exit 0
fi
EOF
fi

# Use the good old way to set the hostname. Also if hostnamectl fails.
case $os in
    archlinux|debian|ubuntu|devuan|coreos|alpine)
        printf "printf '%%s\\\\n' '$name_should' > /etc/hostname\\n"
        echo "hostname -F /etc/hostname"
    ;;
    centos|fedora|redhat|scientific|freebsd|openbsd)
        # NOTE: Writing the hostname to file is done in the manifest.
        echo "hostname '$name_should'"
    ;;
    suse)
        echo "hostname '$name_should'"
        printf "printf '%%s\\\\n' '$name_should' > /etc/HOSTNAME\\n"
    ;;
    macosx)
        echo "scutil --set HostName '$name_should'"
    ;;
    *)
        echo "echo 'Unsupported OS: $os' >&2; exit 1"
    ;;
esac