Duplicity requires a password-less key pair for backup.  It needs to decrypt
the manifest to compare the local cache against the remote store.  This is a
known limitation.

...Ken

On Mon, Apr 11, 2011 at 4:00 PM, Joshua Jensen <email address hidden>wrote:

> Public bug reported:
>
> I'm running a duplicity nightly backup from cron that is having
> problems.  I'm using a GPG keypair.  The public key is used to encrypt
> without a PASSPHRASE or interaction, and the private key to decrypt and
> restore interactively with a PASSPHRASE later if necessary.
>
> This works from my command prompt  *where I am not prompted for anything
> when running this command*.
>
> However, from cron, this fails with getpass.py being uncomfortable about
> not being able to control echo on the terminal:
>
> ARGS="--asynchronous-upload --tempdir /tmp --no-print-statistics \
>        --include /data/backups/bin --encrypt-key CE71E9DC \
>        --exclude-globbing-filelist $DEST/bin/rdiff-backup-excludes \
>        -v2 --volsize 100 $@"
>
> duplicity $ARGS / file://$DESTDIR
>
>
> /usr/lib64/python2.6/getpass.py:83: GetPassWarning: Can not control echo on
> the terminal.
>  passwd = fallback_getpass(prompt, stream)
> Warning: Password input may be echoed.
> GnuPG passphrase: Traceback (most recent call last):
>  File "/usr/bin/duplicity", line 1245, in <module>
>    with_tempdir(main)
>  File "/usr/bin/duplicity", line 1238, in with_tempdir
>    fn()
>  File "/usr/bin/duplicity", line 1139, in main
>    sync_archive()
>  File "/usr/bin/duplicity", line 949, in sync_archive
>    globals.gpg_profile.passphrase = get_passphrase(1, "sync")
>  File "/usr/bin/duplicity", line 129, in get_passphrase
>    pass1 = getpass.getpass("GnuPG passphrase: ")
>  File "/usr/lib64/python2.6/getpass.py", line 83, in unix_getpass
>    passwd = fallback_getpass(prompt, stream)
>  File "/usr/lib64/python2.6/getpass.py", line 118, in fallback_getpass
>    return _raw_input(prompt, stream)
>  File "/usr/lib64/python2.6/getpass.py", line 135, in _raw_input
>    raise EOFError
> EOFError
>
> duplicity version 0.6.11, Python 2.6.5, RHEL 6.0 x86_64, target
> filesystem is an NFS mount
>
>
> Surely non-interactive duplicity commands shouldn't fail because
> duplicity can't go interactive!!
>
> ** Affects: duplicity
>     Importance: Undecided
>         Status: New
>
> --
> You received this bug notification because you are subscribed to
> Duplicity.
> https://bugs.launchpad.net/bugs/758077
>
> Title:
>  non-interactive duplicity job using GPG keys crashes
>
> Status in Duplicity - Bandwidth Efficient Encrypted Backup:
>  New
>
> Bug description:
>  I'm running a duplicity nightly backup from cron that is having
>  problems.  I'm using a GPG keypair.  The public key is used to encrypt
>  without a PASSPHRASE or interaction, and the private key to decrypt
>  and restore interactively with a PASSPHRASE later if necessary.
>
>  This works from my command prompt  *where I am not prompted for
>  anything when running this command*.
>
>  However, from cron, this fails with getpass.py being uncomfortable
>  about not being able to control echo on the terminal:
>
>  ARGS="--asynchronous-upload --tempdir /tmp --no-print-statistics \
>        --include /data/backups/bin --encrypt-key CE71E9DC \
>        --exclude-globbing-filelist $DEST/bin/rdiff-backup-excludes \
>        -v2 --volsize 100 $@"
>
>  duplicity $ARGS / file://$DESTDIR
>
>
>  /usr/lib64/python2.6/getpass.py:83: GetPassWarning: Can not control echo
> on the terminal.
>    passwd = fallback_getpass(prompt, stream)
>  Warning: Password input may be echoed.
>  GnuPG passphrase: Traceback (most recent call last):
>    File "/usr/bin/duplicity", line 1245, in <module>
>      with_tempdir(main)
>    File "/usr/bin/duplicity", line 1238, in with_tempdir
>      fn()
>    File "/usr/bin/duplicity", line 1139, in main
>      sync_archive()
>    File "/usr/bin/duplicity", line 949, in sync_archive
>      globals.gpg_profile.passphrase = get_passphrase(1, "sync")
>    File "/usr/bin/duplicity", line 129, in get_passphrase
>      pass1 = getpass.getpass("GnuPG passphrase: ")
>    File "/usr/lib64/python2.6/getpass.py", line 83, in unix_getpass
>      passwd = fallback_getpass(prompt, stream)
>    File "/usr/lib64/python2.6/getpass.py", line 118, in fallback_getpass
>      return _raw_input(prompt, stream)
>    File "/usr/lib64/python2.6/getpass.py", line 135, in _raw_input
>      raise EOFError
>  EOFError
>
>  duplicity version 0.6.11, Python 2.6.5, RHEL 6.0 x86_64, target
>  filesystem is an NFS mount
>
>
>
>  Surely non-interactive duplicity commands shouldn't fail because duplicity
> can't go interactive!!
>