NissimShiman commented on a change in pull request #4627:
URL: https://github.com/apache/nifi/pull/4627#discussion_r526382460



##########
File path: 
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/TailFile.java
##########
@@ -131,7 +131,7 @@
             .displayName("Base directory")
             .description("Base directory used to look for files to tail. This 
property is required when using Multifile mode.")
             
.expressionLanguageSupported(ExpressionLanguageScope.VARIABLE_REGISTRY)
-            .addValidator(StandardValidators.FILE_EXISTS_VALIDATOR)
+            .addValidator(StandardValidators.DIRECTORY_EXISTS_VALIDATOR)

Review comment:
       @tlsmith109 A new ticket should be opened if we want to modify TailFile 
as well as the ticket is specific to FetchSFTP
   
   That being said, it looks like there is code that already makes sure this is 
a directory [1].  Although, at first glance I am unsure why this wasn't handled 
here, as your code is suggesting. 
   
   [1] 
https://github.com/apache/nifi/blob/main/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/TailFile.java#L277

##########
File path: 
nifi-commons/nifi-utils/src/main/java/org/apache/nifi/processor/util/StandardValidators.java
##########
@@ -848,8 +849,8 @@ public ValidationResult validate(final String subject, 
final String value, final
             }
 
             final File file = new File(substituted);
-            final boolean valid = file.exists();
-            final String explanation = valid ? null : "File " + file + " does 
not exist";
+            final boolean valid = file.exists() & !file.isDirectory();
+            final String explanation = valid ? null : "File " + file + " does 
not exist or is directory";
             return new 
ValidationResult.Builder().subject(subject).input(value).valid(valid).explanation(explanation).build();
         }

Review comment:
       @tlsmith109   I can see why these modifications were made, but it is out 
of the scope of this ticket.  It is best to open a new ticket specifically for 
this so the community has visibility into modifying FileExistsValidator to not 
include directories.




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