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[Bug 387218] Re: Add SFTP-only backend

To: duplicity-team@xxxxxxxxxxxxxxxxxxx
From: Kenneth Loafman <kenneth@xxxxxxxxxxx>
Date: Wed, 01 Jul 2009 15:14:36 -0000
Reply-to: Bug 387218 <387218@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: duplicity
    Milestone: None => 0.6.1

-- 
Add SFTP-only backend
https://bugs.launchpad.net/bugs/387218
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Status in duplicity - Bandwidth Efficient Encrypted Backup: Fix Committed

Bug description:
As of v0.6.0 duplicity does not have a pure SFTP backend, i.e. a backend that uses *only* the SFTP command to communicate with the backup host. The existing backends (SSH / SCP) use SFTP but also SCP. Using only SFTP is desired, because one may create a restricted shell in which SFTP can be run without shell (PTY) access. This is not possible with SCP.

The patch below addresses this issue, by adding a "sftp://"; scheme. The most important file (backends/sftpbackend.py) is a modification of sshbackend, but replaces all scp commands with their equivalent sftp ones.