gh-44: Improved host and domain name handling

Issue OpenNebula/addon-context-linux#44

base.one/etc/one-context.d/15-hostname

@@ -0,0 +1,112 @@
+#!/bin/bash
+
+function set_hostname() {
+    hostname=$1
+
+    if [ -d /run/systemd/system/ ]; then
+        hostnamectl set-hostname --static "${hostname}"
+    else
+        if [ -f /etc/sysconfig/network ]; then
+            sed -i '/^HOSTNAME=.*$/d' /etc/sysconfig/network
+            echo "HOSTNAME=${hostname}" >>/etc/sysconfig/network
+        else
+            echo "${hostname}" >/etc/hostname
+        fi
+
+        hostname "${hostname}"
+    fi
+}
+
+function set_domainname() {
+    domain=$1
+    sed -i '/^domain .*/d' /etc/resolv.conf
+    echo "domain ${domain}" >>/etc/resolv.conf
+}
+
+function get_first_ip() {
+    hostname -I | cut -d' ' -f1
+}
+
+function get_dns_name() {
+    text=$(LC_ALL=C host "$1" 2>/dev/null)
+    [ $? = 0 ] || exit 0
+    [[ $text == *"has no PTR record" ]] && exit 0
+    name=$(echo "$text" | awk '/(has address|name pointer)/ {print $(NF)}' | sed 's/\.$//')
+    echo $name
+}
+
+function update_hosts() {
+    ip=$1
+    name=$2
+    hostname=$3
+
+    if [ "x${hostname}" = "x${name}" ]; then
+        hosts="${name}"
+    else
+        hosts="${name} ${hostname}"
+    fi
+
+    note='# one-contextd'
+    entry="${ip}\t${hosts}\t\t${note}"
+
+    # update our old entry
+    if grep -qi "${note}" /etc/hosts; then
+        sed -i -e "s/^.*${note}\$/${entry}/" /etc/hosts
+    # update entry with same IP (but not localhost)
+    elif grep -E "^${ip}\s" /etc/hosts | grep -qv localhost; then
+        sed -i -e "/localhost/! s/^${ip}\s.*\$/${entry}/" /etc/hosts
+    # update entry with same name
+    elif grep -qE "\s${name}(\s|#|\$)" /etc/hosts; then
+        sed -i -re "s/^.*\s${name}([ #\t].*|$)/${entry}/" /etc/hosts
+    # create new entry
+    elif [ -f /etc/hosts ]; then
+        sed -i -e "1s/^/${entry}\n/" /etc/hosts
+    else
+        echo -e "${entry}" >>/etc/hosts
+    fi
+}
+
+#####
+
+first_ip=$(get_first_ip)
+
+if [ -n "$SET_HOSTNAME" ]; then
+    name=$(echo "$SET_HOSTNAME" | \
+        sed -e 's/[^-a-zA-Z0-9\.]/-/g' -e 's/^-*//g' -e 's/-*$//g')
+elif [ -n "$DNS_HOSTNAME" ]; then
+    name=$(get_dns_name "${first_ip}")
+fi
+
+if [ -n "${name}" ]; then
+    # split host and domain names
+    hostname=${name%%.*}
+    domain=${name#*.}
+    if [ "x${domain}" = "x${hostname}" ]; then
+        domain=''
+    fi
+
+    set_hostname "${hostname}"
+    if [ -n "${domain}" ]; then
+        set_domainname "${domain}"
+    fi
+
+    if [ -n "${DNS_HOSTNAME}" ]; then
+        host_ip=$first_ip
+    else
+        # If selected hostname resolves on first IP,
+        # use first IP for local hostname in /etc/hosts.
+        # Otherwise use loopback IP.
+        name_ip=$(get_dns_name "${name}")
+        if [ "x${first_ip}" = "x${name_ip}" ]; then
+            host_ip=$first_ip
+        elif [ -f /etc/debian_version ]; then
+            host_ip='127.0.1.1'
+        else
+            host_ip='127.0.0.1'
+        fi
+    fi
+
+    if [ -n "${host_ip}" ]; then
+        update_hosts "${host_ip}" "${name}" "${hostname}"
+    fi
+fi

base_arch/etc/one-context.d/15-hostname

@@ -1,26 +1,112 @@
 #!/bin/bash
 
-CONFIG_FILE="/etc/hostname"
-
 function set_hostname() {
-    NAME=$1
+    hostname=$1
+
+    if [ -d /run/systemd/system/ ]; then
+        hostnamectl set-hostname --static "${hostname}"
+    else
+        if [ -f /etc/sysconfig/network ]; then
+            sed -i '/^HOSTNAME=.*$/d' /etc/sysconfig/network
+            echo "HOSTNAME=${hostname}" >>/etc/sysconfig/network
+        else
+            echo "${hostname}" >/etc/hostname
+        fi
 
-    [ -n "$NAME" ] || exit 0
+        hostname "${hostname}"
+    fi
+}
+
+function set_domainname() {
+    domain=$1
+    sed -i '/^domain .*/d' /etc/resolv.conf
+    echo "domain ${domain}" >>/etc/resolv.conf
+}
 
-    hostnamectl set-hostname $NAME
+function get_first_ip() {
+    hostname -I | cut -d' ' -f1
 }
 
 function get_dns_name() {
-    first_ip=$(hostname -I | cut -d' ' -f1)
+    text=$(LC_ALL=C host "$1" 2>/dev/null)
-    text=$(host $first_ip)
     [ $? = 0 ] || exit 0
     [[ $text == *"has no PTR record" ]] && exit 0
-    name=$(echo "$text" | awk '{print $(NF)}' | sed 's/\.$//')
+    name=$(echo "$text" | awk '/(has address|name pointer)/ {print $(NF)}' | sed 's/\.$//')
     echo $name
 }
 
+function update_hosts() {
+    ip=$1
+    name=$2
+    hostname=$3
+
+    if [ "x${hostname}" = "x${name}" ]; then
+        hosts="${name}"
+    else
+        hosts="${name} ${hostname}"
+    fi
+
+    note='# one-contextd'
+    entry="${ip}\t${hosts}\t\t${note}"
+
+    # update our old entry
+    if grep -qi "${note}" /etc/hosts; then
+        sed -i -e "s/^.*${note}\$/${entry}/" /etc/hosts
+    # update entry with same IP (but not localhost)
+    elif grep -E "^${ip}\s" /etc/hosts | grep -qv localhost; then
+        sed -i -e "/localhost/! s/^${ip}\s.*\$/${entry}/" /etc/hosts
+    # update entry with same name
+    elif grep -qE "\s${name}(\s|#|\$)" /etc/hosts; then
+        sed -i -re "s/^.*\s${name}([ #\t].*|$)/${entry}/" /etc/hosts
+    # create new entry
+    elif [ -f /etc/hosts ]; then
+        sed -i -e "1s/^/${entry}\n/" /etc/hosts
+    else
+        echo -e "${entry}" >>/etc/hosts
+    fi
+}
+
+#####
+
+first_ip=$(get_first_ip)
+
 if [ -n "$SET_HOSTNAME" ]; then
-    set_hostname $(echo "$SET_HOSTNAME" | sed -e 's/[^-a-zA-Z0-9]/-/g' -e 's/^-*//g' -e 's/-*$//g')
+    name=$(echo "$SET_HOSTNAME" | \
+        sed -e 's/[^-a-zA-Z0-9\.]/-/g' -e 's/^-*//g' -e 's/-*$//g')
 elif [ -n "$DNS_HOSTNAME" ]; then
-    set_hostname $(get_dns_name)
+    name=$(get_dns_name "${first_ip}")
+fi
+
+if [ -n "${name}" ]; then
+    # split host and domain names
+    hostname=${name%%.*}
+    domain=${name#*.}
+    if [ "x${domain}" = "x${hostname}" ]; then
+        domain=''
+    fi
+
+    set_hostname "${hostname}"
+    if [ -n "${domain}" ]; then
+        set_domainname "${domain}"
+    fi
+
+    if [ -n "${DNS_HOSTNAME}" ]; then
+        host_ip=$first_ip
+    else
+        # If selected hostname resolves on first IP,
+        # use first IP for local hostname in /etc/hosts.
+        # Otherwise use loopback IP.
+        name_ip=$(get_dns_name "${name}")
+        if [ "x${first_ip}" = "x${name_ip}" ]; then
+            host_ip=$first_ip
+        elif [ -f /etc/debian_version ]; then
+            host_ip='127.0.1.1'
+        else
+            host_ip='127.0.0.1'
+        fi
+    fi
+
+    if [ -n "${host_ip}" ]; then
+        update_hosts "${host_ip}" "${name}" "${hostname}"
+    fi
 fi

base_deb.one/etc/one-context.d/15-hostname

@@ -1,28 +0,0 @@
-#!/bin/bash
-
-CONFIG_FILE="/etc/hostname"
-
-function set_hostname() {
-    NAME=$1
-
-    [ -n "$NAME" ] || exit 0
-
-    echo $NAME > $CONFIG_FILE
-
-    hostname $NAME
-}
-
-function get_dns_name() {
-    first_ip=$(hostname -I | cut -d' ' -f1)
-    text=$(host $first_ip)
-    [ $? = 0 ] || exit 0
-    [[ $text == *"has no PTR record" ]] && exit 0
-    name=$(echo "$text" | awk '{print $(NF)}' | sed 's/\.$//')
-    echo $name
-}
-
-if [ -n "$SET_HOSTNAME" ]; then
-    set_hostname $(echo "$SET_HOSTNAME" | sed -e 's/[^-a-zA-Z0-9]/-/g' -e 's/^-*//g' -e 's/-*$//g')
-elif [ -n "$DNS_HOSTNAME" ]; then
-    set_hostname $(get_dns_name)
-fi

base_rpm.one/etc/one-context.d/15-hostname

@@ -1,30 +0,0 @@
-#!/bin/bash
-
-CONFIG_FILE="/etc/sysconfig/network"
-
-function set_hostname() {
-    NAME=$1
-
-    [ -n "$NAME" ] || exit 0
-
-    sed -i '/^HOSTNAME=.*$/d' $CONFIG_FILE
-    echo "HOSTNAME=$NAME" >> $CONFIG_FILE
-    [[ $(awk -F= '/^VERSION_ID/ {gsub("\"","");print $2}' /etc/os-release) -ge 7 ]] && echo $NAME > /etc/hostname
-        
-    hostname $NAME
-}
-
-function get_dns_name() {
-    first_ip=$(hostname -I | cut -d' ' -f1)
-    text=$(host $first_ip)
-    [ $? = 0 ] || exit 0
-    [[ $text == *"has no PTR record" ]] && exit 0
-    name=$(echo "$text" | awk '{print $(NF)}' | sed 's/\.$//')
-    echo $name
-}
-
-if [ -n "$SET_HOSTNAME" ]; then
-    set_hostname $(echo "$SET_HOSTNAME" | sed -e 's/[^-a-zA-Z0-9]/-/g' -e 's/^-*//g' -e 's/-*$//g')
-elif [ -n "$DNS_HOSTNAME" ]; then
-    set_hostname $(get_dns_name)
-fi