sign-key with passphrase needs extra gpg options

[az]

this is a forward of debian bug #842552, which lives over there: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=842552

the issue is that with gpg 2.1, duplicity's method of providing passphrases does no longer work:
--passphrase-fd 0 is not supported UNLESS you also feed it --batch (check, duplicity does that already), AND if you also add --pinentry-mode=loopback, which duplicity does not.

this is discussed in greater detail with gpg's upstream in https://bugs.g10code.com/gnupg/issue1772

workaround for now: add --gpg-options="--pinentry-mode=loopback" to your duplicity invocation,
iff you're using gpg2. gpg(1) doesn't support that option.

long-term fix: ideally duplicity should handle both gpg 1 and 2 automatically.
until then this problem should get at least a line or two in the documentation.

[Kenneth Loafman (kenneth-loafman)]

This was fixed in 0.7.13, so closing this bug report.