Make packer build script interactive

Prompts for config values on first run, saves to server.pkrvars.hcl.
On subsequent runs, shows existing config and asks whether to reuse or
enter new values. Secret keys are hidden when displaying existing config.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packer/build.sh

@@ -4,12 +4,62 @@ set -e
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 cd "$SCRIPT_DIR"
 
-if [ ! -f server.pkrvars.hcl ]; then
+VARS_FILE="server.pkrvars.hcl"
-    echo "Error: server.pkrvars.hcl not found."
+
-    echo "Copy server.pkrvars.hcl.example to server.pkrvars.hcl and fill in your values."
+collect_values() {
-    exit 1
+    echo "=== Server Configuration ==="
+    echo ""
+
+    read -p "Base domain: " BASE_DOMAIN
+
+    read -p "SSH public key path [~/.ssh/id_ed25519.pub]: " PUBKEY_PATH
+    PUBKEY_PATH="${PUBKEY_PATH:-$HOME/.ssh/id_ed25519.pub}"
+    if [ ! -f "$PUBKEY_PATH" ]; then
+        echo "Warning: $PUBKEY_PATH not found, leaving SSH key empty"
+        SSH_PUBKEY=""
+    else
+        SSH_PUBKEY=$(cat "$PUBKEY_PATH")
     fi
 
+    echo ""
+    echo "--- JuiceFS / Nextcloud Storage ---"
+    read -p "S3 endpoint (e.g. https://s3.amazonaws.com): " JUICEFS_S3_ENDPOINT
+    read -p "S3 bucket name: " JUICEFS_S3_BUCKET
+    read -p "S3 access key: " JUICEFS_S3_ACCESS_KEY
+    read -s -p "S3 secret key: " JUICEFS_S3_SECRET_KEY
+    echo
+    read -p "JuiceFS local cache size [50G]: " JUICEFS_CACHE_SIZE
+    JUICEFS_CACHE_SIZE="${JUICEFS_CACHE_SIZE:-50G}"
+
+    cat > "$VARS_FILE" <<EOF
+base_domain           = "$BASE_DOMAIN"
+ssh_pubkey            = "$SSH_PUBKEY"
+juicefs_s3_endpoint   = "$JUICEFS_S3_ENDPOINT"
+juicefs_s3_bucket     = "$JUICEFS_S3_BUCKET"
+juicefs_s3_access_key = "$JUICEFS_S3_ACCESS_KEY"
+juicefs_s3_secret_key = "$JUICEFS_S3_SECRET_KEY"
+juicefs_cache_size    = "$JUICEFS_CACHE_SIZE"
+EOF
+
+    echo ""
+    echo "Configuration saved to $VARS_FILE"
+}
+
+if [ -f "$VARS_FILE" ]; then
+    echo "Existing configuration found ($VARS_FILE):"
+    echo ""
+    grep -v "secret_key" "$VARS_FILE"
+    echo "  (secret keys hidden)"
+    echo ""
+    read -p "Use existing config? [Y/n]: " USE_EXISTING
+    if [[ "$USE_EXISTING" =~ ^[Nn] ]]; then
+        collect_values
+    fi
+else
+    collect_values
+fi
+
+echo ""
 echo "=== Initializing Packer plugins ==="
 packer init ubuntu-server.pkr.hcl
 
@@ -18,7 +68,7 @@ echo "=== Building image ==="
 echo "This will take 15-30 minutes depending on your machine."
 echo ""
 
-packer build -var-file=server.pkrvars.hcl ubuntu-server.pkr.hcl
+packer build -var-file="$VARS_FILE" ubuntu-server.pkr.hcl
 
 echo ""
 echo "==========================================="