Won't recognize my secret key

[NIIBE Yutaka]

Hello,

Thank you for your report.  I think I located the issue of migration.

Phillip Susi <psusi at ubuntu.com> wrote:
> I just noticed that I do have a bunch of key files in
> ~/.gnupg/private-keys-v1.d, even though gpg -K does not show them.
>
> Ahah, gpg -K -v shows them... it seems to think they are all expired.
> It lists the expiration date on my current key as 2018-1-6.  I believe
> that was the *original* expiration date, but then I extended it.  gpg
> 2.1 seems to be failing to recognize the extension.

For the problem of importing secring.gpg directly, we have a task:

	https://dev.gnupg.org/T3101

Basically, secring.gpg only has the information of expiration when it's
created.  After changing expiration, it is only recorded in pubring.gpg.
So, it is recommended to do somthing like:

   $ gpg --homedir ~/.gnupg.old --export-secret-keys | \
	gpg --homedir ~/.gnupg --import

(instead of doing --import ~/.gnupg/secring.gpg directly.)

However, in gnupg/g10/migrate.c, GnuPG itself does that (!).  This
should be fixed.
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