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Date: Mon, 19 Jun 2017 14:51:01 +0000 (UTC)
From: "Len (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
Message-ID: <JIRA.12985719.1467284827000.48342.1497883861818@Atlassian.JIRA>
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References: <JIRA.12985719.1467284827000@Atlassian.JIRA> <JIRA.12985719.1467284827571@jira-lw-us.apache.org>
Subject: [jira] [Commented] (VFS-617) isReadable fails if unable to
 determine group identity
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archived-at: Mon, 19 Jun 2017 14:51:17 -0000


    [ https://issues.apache.org/jira/browse/VFS-617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16054136#comment-16054136 ] 

Len commented on VFS-617:
-------------------------

I had the same issue as L. If the user is only allowed sftp (no exec) this fails. I also ended up patching SftpFileObject.java as following:


{code:java}
protected PosixPermissions getPermissions(final boolean checkIds) throws Exception
    {
        statSelf();
        /*boolean isInGroup = false;
        if (checkIds)
        {
            for (final int groupId : getAbstractFileSystem().getGroupsIds())
            {
                if (groupId == attrs.getGId())
                {
                    isInGroup = true;
                    break;
                }
            }
        }
        final boolean isOwner = checkIds ?  attrs.getUId() == getAbstractFileSystem().getUId() : false;*/
        return new PosixPermissions(attrs.getPermissions(), true, true);
    }
{code}


> 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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