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gpg: Add new usage option for drop-subkey filters.

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* g10/import.c (impex_filter_getval): Add new "usage" property for
drop-subkey filter.
--

For example, this permits extraction of only encryption-capable
subkeys like so:

    gpg --export-filter 'drop-subkey=usage !~ e' --export $FPR

GnuPG-Bug-id: 4019
Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
(cherry picked from commit 2ddfb5bef9)
This commit is contained in:
Daniel Kahn Gillmor 2018-06-12 00:41:59 -04:00 • committed by Werner Koch
parent dc96fd8835
commit 86b64876be
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doc/gpg.texi
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@ -2418,6 +2418,11 @@ The available properties are:
Boolean indicating whether a key or subkey is a secret one.
(drop-subkey)
@item usage
A string indicating the usage flags for the subkey, from the
sequence ``ecsa?''. For example, a subkey capable of just signing
and authentication would be an exact match for ``sa''. (drop-subkey)
@item sig_created
@itemx sig_created_d
The first is the timestamp a signature packet was created. The