add backup suite

backup/backup.sh

@@ -0,0 +1,136 @@
+#!/bin/bash
+
+# ==============================================================================
+# SAP HANA Backup Script
+#
+# Performs schema exports and/or tenant backups for a SAP HANA database.
+# Designed to be executed via a cronjob.
+# Reads all settings from the backup.conf file in the same directory.
+# ==============================================================================
+
+# --- Configuration and Setup ---
+
+# Find the script's own directory to locate the config file
+SCRIPT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &> /dev/null && pwd)
+CONFIG_FILE="${SCRIPT_DIR}/backup.conf"
+
+# Check for config file and source it
+if [[ -f "$CONFIG_FILE" ]]; then
+    source "$CONFIG_FILE"
+else
+    echo "❌ Error: Configuration file not found at '${CONFIG_FILE}'"
+    exit 1
+fi
+
+# Check if hdbsql executable exists
+if [[ ! -x "$HDBSQL_PATH" ]]; then
+    echo "❌ Error: hdbsql not found or not executable at '${HDBSQL_PATH}'"
+    exit 1
+fi
+
+# Calculate threads to use (half of the available cores, but at least 1)
+TOTAL_THREADS=$(nproc --all)
+THREADS=$((TOTAL_THREADS / 2))
+if [[ "$THREADS" -eq 0 ]]; then
+    THREADS=1
+fi
+
+# --- Functions ---
+
+# Performs a binary export of a specific schema and compresses it.
+perform_schema_export() {
+    echo "⬇️  Starting schema export for '${SCHEMA_NAME}'..."
+
+    local timestamp
+    timestamp=$(date +%Y%m%d_%H%M%S)
+    local export_dir="${BACKUP_BASE_DIR}/schema_exports"
+    local export_path="${export_dir}/${SCHEMA_NAME}_${timestamp}"
+    local archive_file="${export_path}.tar.gz"
+
+    # Create the target directory if it doesn't exist
+    mkdir -p "$export_dir"
+
+    # Construct and execute the EXPORT query
+    local query="EXPORT \"${SCHEMA_NAME}\".\"*\" AS BINARY INTO '${export_path}' WITH REPLACE THREADS ${THREADS};"
+
+    # We redirect stdout and stderr to /dev/null for cleaner cron logs.
+    # Remove "> /dev/null 2>&1" if you need to debug connection issues.
+    "$HDBSQL_PATH" -U "$USER_KEY" "$query" > /dev/null 2>&1
+    local exit_code=$?
+
+    if [[ "$exit_code" -eq 0 ]]; then
+        echo "    ✅ Successfully exported schema '${SCHEMA_NAME}'."
+
+        # Compress the exported directory
+        echo "    🗜️  Compressing exported files..."
+        tar -czf "$archive_file" -C "$export_dir" "$(basename "$export_path")"
+        local tar_exit_code=$?
+
+        if [[ "$tar_exit_code" -eq 0 ]]; then
+            echo "    ✅ Successfully created archive '${archive_file}'."
+            echo "    🧹 Cleaning up temporary directory..."
+            rm -rf "$export_path"
+            echo "    ✨ Cleanup complete."
+        else
+            echo "    ❌ Error: Failed to compress '${export_path}'."
+        fi
+    else
+        echo "    ❌ Error: Failed to export schema '${SCHEMA_NAME}' (hdbsql exit code: ${exit_code})."
+    fi
+}
+
+# Performs a full backup of the tenant database.
+perform_tenant_backup() {
+    echo "⬇️  Starting tenant backup..."
+    
+    local timestamp
+    timestamp=$(date +%Y%m%d_%H%M%S)
+    local backup_dir="${BACKUP_BASE_DIR}/tenant_backups"
+    # HANA will create the final file; we just provide the location and prefix.
+    local backup_path_prefix="${backup_dir}/backup_${timestamp}"
+
+    # Create the target directory if it doesn't exist
+    mkdir -p "$backup_dir"
+
+    # The USER_KEY must be configured to connect to the desired tenant database.
+    local query="BACKUP DATA USING FILE ('${backup_path_prefix}')"
+
+    # We redirect stdout and stderr to /dev/null for cleaner cron logs.
+    # Remove "> /dev/null 2>&1" if you need to debug connection issues.
+    "$HDBSQL_PATH" -U "$USER_KEY" "$query" > /dev/null 2>&1
+    local exit_code=$?
+
+    if [[ "$exit_code" -eq 0 ]]; then
+        echo "    ✅ Successfully initiated tenant backup with prefix '${backup_path_prefix}'."
+    else
+        echo "    ❌ Error: Failed to initiate tenant backup (hdbsql exit code: ${exit_code})."
+    fi
+}
+
+# --- Main Execution ---
+
+echo "⚙️  Starting HANA backup process..."
+
+# Ensure the base directory exists
+mkdir -p "$BACKUP_BASE_DIR"
+
+case "$BACKUP_TYPE" in
+    schema)
+        perform_schema_export
+        ;;
+    tenant)
+        perform_tenant_backup
+        ;;
+    all)
+        perform_schema_export
+        echo "" # Add a newline for better readability
+        perform_tenant_backup
+        ;;
+    *)
+        echo "    ❌ Error: Invalid BACKUP_TYPE '${BACKUP_TYPE}' in config. Use 'schema', 'tenant', or 'all'."
+        ;;
+esac
+
+echo "📦 Backup process complete."
+echo "👋 Exiting."
+