Logan created SSHD-1130:
---------------------------

             Summary: Sftp directory listing with permission denied error
                 Key: SSHD-1130
                 URL: https://issues.apache.org/jira/browse/SSHD-1130
             Project: MINA SSHD
          Issue Type: Improvement
    Affects Versions: 2.1.0, 2.6.0
            Reporter: Logan


Iterating a directory with no valid permission using DirectoryStream throws 
SftpException wrapped as RuntimeException on the iterator.next(), While this is 
perfectly valid with Iterator interface standard, to really determine if the 
issue is with permissions we have look at the cause of RuntimeException.

 
{code:java}
try (DirectoryStream<Path> ds = Files.newDirectoryStream(remoteDir)) {
   for (Path remoteFile : ds) { ..}
} catch (RuntimeException ex) { 
    Throwable cause = ex.getCause();  
    if (cause != null && cause instanceof SftpException) { 
       System.err.println("sftp error..probably permissions issue: " + 
ex.getMessage());
    } else {
       System.err.println("Unknown error: " + ex.getMessage()); 
    }
}
{code}
 

On the flip side using SftpClient and SftpDirEntryIterator, an SftpException is 
throw in the constructor of SftpDirEntryIterator.  This makes easy to determine 
that cause of the error for invalid permissions.  So wondering if the 
implementation of SftpDirectoryStream can be improved throw SftpException in 
the constructor?

 
{code:java}
try (SftpDirEntryIterator pathIterator = new SftpDirEntryIterator(sftpClient, 
remotePath)) {
   while (pathIterator.hasNext()) {
   DirEntry dirEntry = pathIterator.next();
   ...
 }
 } catch (SftpException ex) {}
{code}
 



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