[VFS-822] [SFTP] getGroupIds() throws NumberFormatException when a user has no groups

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.9.0
• Fix Version/s: 2.10.0
• Assignee: Unassigned
• Reporter: Mark van der Walle
• Created: 27/Jul/22 09:28
• Updated: 01/Sep/22 10:35
• Resolved: 28/Jul/22 19:27

Description

In https://github.com/apache/commons-vfs/blob/master/commons-vfs2/src/main/java/org/apache/commons/vfs2/provider/sftp/SftpFileSystem.java#L258 the groupIds are retrieved using the command id -G. If a user has no groups (gid=0 for example) then the result is that:

https://github.com/apache/commons-vfs/blob/master/commons-vfs2/src/main/java/org/apache/commons/vfs2/provider/sftp/SftpFileSystem.java#L264

will have an array with one entry being an empty string. This results in a NumberFormatException.