[jira] (VFS-617) SFTP isReadable fails if unable to determine group identity

["Nim Lhûg (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/VFS-617 ]


    Nim Lhûg deleted comment on VFS-617:
    ------------------------------

was (Author: nimlhug):
I've created a PR against trunk: https://github.com/apache/commons-vfs/pull/27

It's difficult to create a useful testcase against the embedded SFTP server, as I don't see an immediate way to disable its exec channel.

> SFTP 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
>            Priority: Major
>             Fix For: 2.5.0
>
>
> 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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