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Re: [Duplicity-talk] duplicity incr - private key missing

From: Kenneth Loafman
Subject: Re: [Duplicity-talk] duplicity incr - private key missing
Date: Tue, 23 Nov 2010 07:07:55 -0600

To guarantee that the remote and local caches are the same duplicity compares the manifest files.  The remote manifest is encrypted, thus the need for the private key.


On Tue, Nov 23, 2010 at 6:49 AM, <address@hidden> wrote:
In theory duplicity does not need the private key of a backups encryption public key for incremental backup anymore. This is possible due to the unencrypted contents of the archive dir.

In practice a duply user now stumbled over the following. I can reproduce this.

Generate a key pair. Export it.
Delete the private key from your keyring.
Do an initial backup with duplicity.
Do a second backup or force an incremental backup. This fails with an error like

"The matching private key is missing"

What is going on here. Can somebody more familiar with the encryption code please confirm this behaviour. I tried version 0.6.06, 0.6.08 and 0.6.11 .. none works as expected.

Commandline generated by duply is

TMPDIR='/tmp' /srv/www/vhosts/jamoke.net/_apps/duplicity-0.6.06/bin/duplicity --encrypt-key DA3FEEDB --verbosity '4' --exclude-globbing-filelist '/srv/www/vhosts/jamoke.net/.duply/keytest/exclude' '~/duply_dev' 'file:///tmp/keyt3esrt'

thanks ede/duply.net

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