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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>
This commit is contained in:
Daniel Kahn Gillmor 2018-06-12 00:41:59 -04:00 • committed by Werner Koch
parent 615b9d1fb7
commit 2ddfb5bef9
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GPG key ID: E3FDFF218E45B72B
2 changed files with 15 additions and 0 deletions
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10
g10/import.c
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@ -1314,6 +1314,16 @@ impex_filter_getval (void *cookie, const char *propname)
{
result = pk_is_disabled (pk)? "1":"0";
}
else if (!strcmp (propname, "usage"))
{
snprintf (numbuf, sizeof numbuf, "%s%s%s%s%s",
(pk->pubkey_usage & PUBKEY_USAGE_ENC)?"e":"",
(pk->pubkey_usage & PUBKEY_USAGE_SIG)?"s":"",
(pk->pubkey_usage & PUBKEY_USAGE_CERT)?"c":"",
(pk->pubkey_usage & PUBKEY_USAGE_AUTH)?"a":"",
(pk->pubkey_usage & PUBKEY_USAGE_UNKNOWN)?"?":"");
result = numbuf;
}
else
result = NULL;
}