[pkg-gnupg-maint] Bug#820676: https://bugs.debian.org/820676 is known and expected upstream.

[Daniel Kahn Gillmor]

Control: forwarded 820676 https://bugs.gnupg.org/gnupg/issue2331

I reported the issue upstream and Werner Koch wrote:

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gpg1 does not known about keygrips.  Instead of the keygrip, gpg1 uses the
fingerprint as cacheid for gpg-agent.  The agent's command GET_PASSPHRAE, as
used by gpg1, uses a different cache mode from what gpg-preset-passphrases uses.
 Thus even if you replace the keygrip with the fingerprint of the (sub)key, it
won't work.

I'll add 
  Note, that the tool @command{gpg-preset-passphrase}, which comes
  with GnuPG-2, cannot be used to preset a passphrase for this
  version of GnuPG.
to the gpg 1 man page.
--------------------

When this change makes it into the documentation, i'll close the debian bug.

        --dkg