Comment 6 for bug 946988

Using duplicity 0.6.19 and seeing this issue

* Not using gpg-agent
* Exporting PASSPHRASE on script that runs duplicity
* Sign and encryption keys are the same

```
Reading globbing filelist offsite-backup.list
Local and Remote metadata are synchronized, no sync needed.
Last full backup left a partial set, restarting.
Last full backup date: Wed Jul 11 16:39:03 2012
Reuse configured PASSPHRASE as SIGN_PASSPHRASE
RESTART: Volumes 35 to 35 failed to upload before termination.
         Restarting backup at volume 35.
GPGError: GPG Failed, see log below:
===== Begin GnuPG log =====
gpg: encrypted with 2048-bit RSA key, ID 49A09DC2, created 2012-07-11
"Backup (Encryption key for backups) <*obfuscated*@*obfuscated*.com>"
gpg: public key decryption failed: bad passphrase
gpg: decryption failed: secret key not available
===== End GnuPG log =====
```

GnuPG version 1.4.12 on Mac OSX Lion 10.7.4