add file exists check

check_cert_file_expiry.py

@@ -4,6 +4,7 @@ import subprocess
 import datetime
 import argparse
 import enum
+import os
 import sys
 from email.utils import parsedate_to_datetime
 
@@ -50,31 +51,36 @@ if __name__ == '__main__':
     message = "Plugin failed"
     perfdata = {}
 
-    try:
-        expiry_date = get_expiry_date(args.file)
-
-
-        perfdata["expires_in"] = (expiry_date - datetime.datetime.now(expiry_date.tzinfo)).days
-
-        if is_expired(args.file, 0):
-            message = f"Expired on {expiry_date}"
-            status = Status.CRITICAL
-
-        elif is_expired(args.file, args.critical_threshold):
-            message = f"Will expire on {expiry_date}"
-            status = Status.CRITICAL
-
-        elif is_expired(args.file, args.warning_threshold):
-            message = f"Will expire on {expiry_date}"
-            status = Status.WARNING
-
-        else:
-            message = f"Will expire on {expiry_date}"
-            status = Status.OK
-
-    except Exception as e:
-        message = f"Failed: {e}"
+    if not os.path.isfile(args.file):
         status = Status.UNKNOWN
+        message = "File not found"
+
+    else:
+        try:
+            expiry_date = get_expiry_date(args.file)
+
+
+            perfdata["expires_in"] = (expiry_date - datetime.datetime.now(expiry_date.tzinfo)).days
+
+            if is_expired(args.file, 0):
+                message = f"Expired on {expiry_date}"
+                status = Status.CRITICAL
+
+            elif is_expired(args.file, args.critical_threshold):
+                message = f"Will expire on {expiry_date}"
+                status = Status.CRITICAL
+
+            elif is_expired(args.file, args.warning_threshold):
+                message = f"Will expire on {expiry_date}"
+                status = Status.WARNING
+
+            else:
+                message = f"Will expire on {expiry_date}"
+                status = Status.OK
+
+        except Exception as e:
+            message = f"Failed: {e}"
+            status = Status.UNKNOWN
 
     perfdata_str = ""
     for key,value in perfdata.items():