Heat templates for deploying OpenStack
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#!/bin/bash
set -eux
set -o pipefail
write_entries() {
local file="$1"
local entries="$2"
# Don't do anything if the file isn't there
if [ ! -f "$file" ]; then
return
fi
if grep -q "^# HEAT_HOSTS_START" "$file"; then
temp=$(mktemp)
(
sed '/^# HEAT_HOSTS_START/,$d' "$file"
echo -ne "\n# HEAT_HOSTS_START - Do not edit manually within this section!\n"
echo "$entries"
echo -ne "# HEAT_HOSTS_END\n\n"
sed '1,/^# HEAT_HOSTS_END/d' "$file"
) > "$temp"
echo "INFO: Updating hosts file $file, check below for changes"
diff "$file" "$temp" || true
cat "$temp" > "$file"
else
echo -ne "\n# HEAT_HOSTS_START - Do not edit manually within this section!\n" >> "$file"
echo "$entries" >> "$file"
echo -ne "# HEAT_HOSTS_END\n\n" >> "$file"
fi
}
hosts="WRITE_HOSTS"
if [ ! -z "$hosts" ]; then
for tmpl in /etc/cloud/templates/hosts.*.tmpl ; do
write_entries "$tmpl" "$hosts"
done
write_entries "/etc/hosts" "$hosts"
else
echo "No hosts in Heat, nothing written."
fi