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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)
awk -v v="$entries" '/^# HEAT_HOSTS_START/ {
print $0
print v
f=1
}f &&!/^# HEAT_HOSTS_END$/{next}/^# HEAT_HOSTS_END$/{f=0}!f' "$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" >> "$file"
fi
}
if [ ! -z "$hosts" ]; then
# cloud-init files are /etc/cloud/templates/hosts.OSNAME.tmpl
DIST=$(lsb_release -is | tr -s [A-Z] [a-z])
case $DIST in
fedora|redhatenterpriseserver)
name="redhat"
;;
*)
name="$DIST"
;;
esac
write_entries "/etc/cloud/templates/hosts.${name}.tmpl" "$hosts"
write_entries "/etc/hosts" "$hosts"
else
echo "No hosts in Heat, nothing written."
fi
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