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#!/bin/bash
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CONFIG_FILE="/etc/hostname"
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function set_hostname() {
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NAME=$1
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[ -n "$NAME" ] || exit 0
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echo $NAME > $CONFIG_FILE
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hostname $NAME
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}
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function get_dns_name() {
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first_ip=$(hostname -I | cut -d' ' -f1)
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text=$(host $first_ip)
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[ $? = 0 ] || exit 0
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[[ $text == *"has no PTR record" ]] && exit 0
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name=$(echo "$text" | awk '{print $(NF)}' | sed 's/\.$//')
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echo $name
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}
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if [ -n "$SET_HOSTNAME" ]; then
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set_hostname $(echo "$SET_HOSTNAME" | sed -e 's/[^-a-zA-Z0-9]/-/g' -e 's/^-*//g' -e 's/-*$//g')
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elif [ -n "$DNS_HOSTNAME" ]; then
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set_hostname $(get_dns_name)
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fi
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