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https://issues.apache.org/jira/browse/VFS-651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16365483#comment-16365483
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Syed Aqeel Ashiq commented on VFS-651:
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[~ottobackwards] I have added sample source code, and some explanation in code
comments above. Please have another look. Thanks in advance!!
> SftpFileSystem Should not switch to root directory when not absolutely needed
> -----------------------------------------------------------------------------
>
> Key: VFS-651
> URL: https://issues.apache.org/jira/browse/VFS-651
> Project: Commons VFS
> Issue Type: Bug
> Affects Versions: 2.0
> Reporter: Syed Aqeel Ashiq
> Priority: Major
> Fix For: 2.3
>
>
> Consider a user X only has read/write access to let's say /sftp and /sftp/abc
> directory on a sftp server. And default directory for user is /sftp
> In this case, we have to set userDirIsRoot to false, and thus vfs will try to
> switch to root directory, which will fail due to lack of read permission.
> Consider following code:
> {code:java}
> public void uploadFile(String localFilePath) throws FileSystemException {
>
> FileSystemManager manager = VFS.getManager();
> FileObject localFile = manager.resolveFile(localFilePath);
> FileSystemOptions opts = new FileSystemOptions();
> SftpFileSystemConfigBuilder.getInstance().setUserDirIsRoot(opts, false);
> // I set it to false, because user default dir is /sftp and it is obviously
> not root directory. As a workaround, If I set it to true, it will work after
> also tweaking with the file path while resolving a file, but semantics will
> be wrong, since the user directory is not root.
> SftpFileSystemConfigBuilder.getInstance().setTimeout(opts, 90000);
> String remoteFilePath =
> "sftp://myuser:[email protected]/sftp/abc/abc.txt";;
> FileObject remoteFile = manager.resolveFile(remoteFilePath, opts); //
> Exception at this line
> remoteFile.copyFrom(localFile, Selectors.SELECT_SELF);
> }
> {code}
> This is the underlying code responsible in
> {code:java}
> org.apache.commons.vfs.provider.sftp.SftpFileSystem
> {code}
> :
> {code:java}
> Boolean userDirIsRoot =
> SftpFileSystemConfigBuilder.getInstance().getUserDirIsRoot(getFileSystemOptions());
> String workingDirectory = getRootName().getPath();
> if (workingDirectory != null && (userDirIsRoot == null ||
> !userDirIsRoot.booleanValue())) {
> try {
> channel.cd(workingDirectory);
> } catch (SftpException e) {
> throw new
> FileSystemException("vfs.provider.sftp/change-work-directory.error",
> workingDirectory);
> }
> }{code}
> It purposelessly switches to root directory of filesystem. There is a fair
> use-case that root directory doesn't have read access.
> *Possible Fix:* It should not switch to root directory, rather it should
> switch to actual final directory. This approach would be the safest. E.g. if
> the needed directory is '/sftp/abc' then it can switch to that directory in
> above code, rather than switching to root.
> Please also see related SO question:
> https://stackoverflow.com/questions/48709971/why-apache-vfs-sftp-tries-to-switch-to-root-directory-even-when-not-needed
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