scripts/hosts-config.sh

   1 #!/bin/bash
   2 set -eux
   3 set -o pipefail
   4
   5 write_entries() {
   6     local file="$1"
   7     local entries="$2"
   8
   9     # Don't do anything if the file isn't there
  10     if [ ! -f "$file" ]; then
  11         return
  12     fi
  13
  14     if grep -q "^# HEAT_HOSTS_START" "$file"; then
  15         temp=$(mktemp)
  16         awk -v v="$entries" '/^# HEAT_HOSTS_START/ {
  17             print $0
  18             print v
  19             f=1
  20             }f &&!/^# HEAT_HOSTS_END$/{next}/^# HEAT_HOSTS_END$/{f=0}!f' "$file" > "$temp"
  21             echo "INFO: Updating hosts file $file, check below for changes"
  22             diff "$file" "$temp" || true
  23             cat "$temp" > "$file"
  24     else
  25         echo -ne "\n# HEAT_HOSTS_START - Do not edit manually within this section!\n" >> "$file"
  26         echo "$entries" >> "$file"
  27         echo -ne "# HEAT_HOSTS_END\n\n" >> "$file"
  28     fi
  29
  30 }
  31
  32 if [ ! -z "$hosts" ]; then
  33     for tmpl in /etc/cloud/templates/hosts.*.tmpl ; do
  34         write_entries "$tmpl" "$hosts"
  35     done
  36     write_entries "/etc/hosts" "$hosts"
  37 else
  38     echo "No hosts in Heat, nothing written."
  39 fi