Merge "Configure /etc/hosts via os-collect-config script"

1 files changed, 47 insertions, 0 deletions

diff --git a/scripts/hosts-config.sh b/scripts/hosts-config.sh
new file mode 100755
index 00000000..4826d615
--- /dev/null
+++ b/scripts/hosts-config.sh
@@ -0,0 +1,47 @@
+#!/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