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https://issues.apache.org/jira/browse/VFS-617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15468193#comment-15468193
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David Johansson commented on VFS-617:
-------------------------------------
I have the same problem in a chrooted SFTP only enviroment.
The call "id -G" returns -1 and the output string from the server is "This
service allows sftp connections only."
The "id -G" fails because SSH is not available.
Reverted to VFS 2.0 and everything works as expected
> isReadable fails if unable to determine group identity
> ------------------------------------------------------
>
> Key: VFS-617
> URL: https://issues.apache.org/jira/browse/VFS-617
> Project: Commons VFS
> Issue Type: Bug
> Affects Versions: 2.1
> Environment: Windows 7 Java 7. Failure occured connecting via SFTP to
> a Synology box running DSM 6.
> Reporter: Tim Nickels
>
> The doIsReadable method of SftpFileObject throws an exception if the system
> cannot identify group/owner permissions.......
> Exception in thread "main" org.apache.commons.vfs2.FileSystemException: Could
> not determine if file "sftp://myURI"; is readable.
> at
> org.apache.commons.vfs2.provider.AbstractFileObject.isReadable(AbstractFileObject.java:1761)
> at com.avenca.vfs.VFSUtils.main(VFSUtils.java:41)
> Caused by: com.jcraft.jsch.JSchException: Could not get the groups id of the
> current user (error code: 1)
> at
> org.apache.commons.vfs2.provider.sftp.SftpFileSystem.getGroupsIds(SftpFileSystem.java:263)
> at
> org.apache.commons.vfs2.provider.sftp.SftpFileObject.getPermissions(SftpFileObject.java:317)
> at
> org.apache.commons.vfs2.provider.sftp.SftpFileObject.doIsReadable(SftpFileObject.java:335)
> at
> org.apache.commons.vfs2.provider.AbstractFileObject.isReadable(AbstractFileObject.java:1757)
> The problem is the method is using
> return getPermissions(true).isReadable()
> The folder *is* readable without these permissions, and so should be set to
> return getPermissions(false).isReadable()
> Which correctly allows the system to identify a readable folder without
> adding unnecessary restrictions.
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