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113 lines
2.8 KiB
113 lines
2.8 KiB
#!/bin/bash
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function set_hostname() {
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hostname=$1
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if [ -d /run/systemd/system/ ]; then
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hostnamectl set-hostname --static "${hostname}"
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else
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if [ -f /etc/sysconfig/network ]; then
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sed -i '/^HOSTNAME=.*$/d' /etc/sysconfig/network
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echo "HOSTNAME=${hostname}" >>/etc/sysconfig/network
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else
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echo "${hostname}" >/etc/hostname
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fi
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hostname "${hostname}"
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fi
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}
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function set_domainname() {
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domain=$1
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sed -i '/^domain .*/d' /etc/resolv.conf
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echo "domain ${domain}" >>/etc/resolv.conf
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}
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function get_first_ip() {
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hostname -I | cut -d' ' -f1
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}
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function get_dns_name() {
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text=$(LC_ALL=C host "$1" 2>/dev/null)
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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 '/(has address|name pointer)/ {print $(NF)}' | sed 's/\.$//')
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echo $name
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}
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function update_hosts() {
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ip=$1
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name=$2
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hostname=$3
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if [ "x${hostname}" = "x${name}" ]; then
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hosts="${name}"
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else
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hosts="${name} ${hostname}"
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fi
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note='# one-contextd'
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entry="${ip}\t${hosts}\t\t${note}"
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# update our old entry
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if grep -qi "${note}" /etc/hosts; then
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sed -i -e "s/^.*${note}\$/${entry}/" /etc/hosts
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# update entry with same IP (but not localhost)
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elif grep -E "^${ip}\s" /etc/hosts | grep -qv localhost; then
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sed -i -e "/localhost/! s/^${ip}\s.*\$/${entry}/" /etc/hosts
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# update entry with same name
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elif grep -qE "\s${name}(\s|#|\$)" /etc/hosts; then
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sed -i -re "s/^.*\s${name}([ #\t].*|$)/${entry}/" /etc/hosts
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# create new entry
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elif [ -f /etc/hosts ]; then
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sed -i -e "1s/^/${entry}\n/" /etc/hosts
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else
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echo -e "${entry}" >>/etc/hosts
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fi
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}
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#####
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first_ip=$(get_first_ip)
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if [ -n "$SET_HOSTNAME" ]; then
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name=$(echo "$SET_HOSTNAME" | \
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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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name=$(get_dns_name "${first_ip}")
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fi
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if [ -n "${name}" ]; then
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# split host and domain names
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hostname=${name%%.*}
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domain=${name#*.}
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if [ "x${domain}" = "x${hostname}" ]; then
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domain=''
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fi
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set_hostname "${hostname}"
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if [ -n "${domain}" ]; then
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set_domainname "${domain}"
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fi
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if [ -n "${DNS_HOSTNAME}" ]; then
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host_ip=$first_ip
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else
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# If selected hostname resolves on first IP,
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# use first IP for local hostname in /etc/hosts.
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# Otherwise use loopback IP.
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name_ip=$(get_dns_name "${name}")
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if [ "x${first_ip}" = "x${name_ip}" ]; then
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host_ip=$first_ip
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elif [ -f /etc/debian_version ]; then
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host_ip='127.0.1.1'
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else
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host_ip='127.0.0.1'
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fi
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fi
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if [ -n "${host_ip}" ]; then
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update_hosts "${host_ip}" "${name}" "${hostname}"
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fi
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fi
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