adding logger for inclusion in templates

pkgroot/usr/local/vfuse/bin/vfuse

@@ -3,7 +3,7 @@
 This script takes a never-booted DMG and converts it to a VMware Fusion VM.
 
 Requirements:
-    OS X 10.9.5+
+    OS X 10.13.6+
     VMware Fusion Pro
     DMG created with AutoDMG
 '''
@@ -30,6 +30,7 @@ import argparse
 import glob
 import hashlib
 import json
+import logging
 import os
 import plistlib
 import shutil
@@ -771,6 +772,7 @@ def main():
     serial_format = False
     dmg_name = ''
     guest_os = ''
+    logger_file = None
 
     if args.list_templates:
         templates = []
@@ -1007,6 +1009,8 @@ def main():
             snapshot = d['snapshot']
         if d.get('snapshot_name'):
             snapshot_name = d['snapshot_name']
+        if d.get('logger_file'):
+            logger_file = d['logger_file']
 
     mount_point, disk_id, volume_kind = mount_dmg(source_dmg)
 
@@ -1130,6 +1134,30 @@ def main():
         if os.getuid() == 0:
             set_perms(cache_receipt)
 
+    if logger_file:
+        msg_type = 'vfuse'
+        action = 'build'
+        status = 'success'
+        message = args.template.split('/')[-1].replace('.json', '')
+
+        root_logger = logging.getLogger()
+        mylogger = logging.getLogger("vfuse_logger")
+        mylogger.setLevel(logging.INFO)
+        our_formatter = logging.Formatter(
+            fmt='%(asctime)s; %(message)s',
+            datefmt='%Y-%m-%d %H:%M:%S %z'
+        )
+        # Set up file handler
+        file_handler = logging.FileHandler(logger_file)
+        file_handler.setLevel(logging.INFO)
+        file_handler.setFormatter(our_formatter)
+        mylogger.addHandler(file_handler)
+        root_logger.disabled = True
+        # Message must always match a certain structure
+        msg = 'type: {}; action: {}; status: {}; msg: {};'.format(
+            msg_type, action, status, message
+        )
+        mylogger.info(msg)
 
 
 if __name__ == '__main__':