Optimized exits

docker-volume-recover.sh

@@ -1,32 +1,61 @@
 #!/bin/bash
+
+# Check minimum number of arguments
+if [ $# -lt 3 ]; then
+  echo "ERROR: Not enough arguments. Please provide at least a volume name, backup hash, and version."
+  exit 1
+fi
+
 volume_name="$1"          # Volume-Name
 backup_hash="$2"          # Hashed Machine ID
 version="$3"              # version to backup
-container="$4"            # optional
-mysql_root_password="$5"  # optional
-database="$6"             # optional
+container="${4:-}"        # optional
+mysql_root_password="${5:-}"  # optional
+database="${6:-}"         # optional
 backup_folder="Backups/$backup_hash/docker-volume-backup/$version/$volume_name"
 backup_files="/$backup_folder/files"
 backup_sql="/$backup_folder/sql/backup.sql"
+
 echo "Inspect volume $volume_name"
 docker volume inspect "$volume_name"
 exit_status_volume_inspect=$?
+
 if [ $exit_status_volume_inspect -eq 0 ]; then
-    echo "Volume $volume_name allready exists"
-  else
+    echo "Volume $volume_name already exists"
+else
     echo "Create volume $volume_name"
     docker volume create "$volume_name"
+    if [ $? -ne 0 ]; then
+        echo "ERROR: Failed to create volume $volume_name"
+        exit 1
+    fi
 fi
 
 if [ -f "$backup_sql" ]; then
-  echo "recover mysql dump"
-  cat $backup_sql | docker exec -i "$container" /usr/bin/mysql -u root --password="$mysql_root_password" $database
+  if [ -n "$container" ] && [ -n "$mysql_root_password" ] && [ -n "$database" ]; then
+    echo "recover mysql dump"
+    cat "$backup_sql" | docker exec -i "$container" /usr/bin/mysql -u root --password="$mysql_root_password" "$database"
+    if [ $? -ne 0 ]; then
+        echo "ERROR: Failed to recover mysql dump"
+        exit 1
+    fi
+    exit 0
+  fi
+  echo "A database backup exists, but a parameter is missing. Files will be recovered instead."
+fi 
+
+if [ -d "$backup_files" ]; then    
+  echo "recover files"
+  docker run --rm -v "$volume_name:/recover/" -v "$backup_files:/backup/" "kevinveenbirkenbach/alpine-rsync" sh -c "rsync -avv --delete /backup/ /recover/"
+  if [ $? -ne 0 ]; then
+    echo "ERROR: Failed to recover files"
+    exit 1
+  fi
   exit 0
 else
-  if [ -d "$backup_files" ]; then    
-    echo "recover files"
-    docker run --rm -v "$volume_name:/recover/" -v "$backup_files:/backup/" "kevinveenbirkenbach/alpine-rsync" sh -c "rsync -avv --delete /backup/ /recover/"
-  fi
+  echo "ERROR: $backup_files doesn't exist"
+  exit 1
 fi
-echo "ERROR: $backup_files and $backup_sql don't exist"
-exit 1
+
+echo "ERROR: Unhandled case"
+exit 1