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         (
  17         sed '/^# HEAT_HOSTS_START/,$d' "$file"
  18         echo -ne "\n# HEAT_HOSTS_START - Do not edit manually within this section!\n"
  19         echo "$entries"
  20         echo -ne "# HEAT_HOSTS_END\n\n"
  21         sed '1,/^# HEAT_HOSTS_END/d' "$file"
  22         ) > "$temp"
  23         echo "INFO: Updating hosts file $file, check below for changes"
  24         diff "$file" "$temp" || true
  25         cat "$temp" > "$file"
  26     else
  27         echo -ne "\n# HEAT_HOSTS_START - Do not edit manually within this section!\n" >> "$file"
  28         echo "$entries" >> "$file"
  29         echo -ne "# HEAT_HOSTS_END\n\n" >> "$file"
  30     fi
  31
  32 }
  33
  34 if [ ! -z "$hosts" ]; then
  35     for tmpl in /etc/cloud/templates/hosts.*.tmpl ; do
  36         write_entries "$tmpl" "$hosts"
  37     done
  38     write_entries "/etc/hosts" "$hosts"
  39 else
  40     echo "No hosts in Heat, nothing written."
  41 fi