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[Duplicity-talk] duplicity incr - private key missing

From: edgar . soldin
Subject: [Duplicity-talk] duplicity incr - private key missing
Date: Tue, 23 Nov 2010 13:49:38 +0100
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20101027 Thunderbird/3.1.6

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' 

thanks ede/duply.net

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