[git] GnuPG - branch, fix-T4019, created. gnupg-2.2.8-5-ge037657

[by Daniel Kahn Gillmor]

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The branch, fix-T4019 has been created
        at  e037657edaf0b3ee9d2e30f6fe3edf6879976472 (commit)

- Log -----------------------------------------------------------------
commit e037657edaf0b3ee9d2e30f6fe3edf6879976472
Author: Daniel Kahn Gillmor <dkg at fifthhorseman.net>
Date:   Tue Jun 12 00:41:59 2018 -0400

    gpg: Add new usage option for drop-subkey filters.
    
    * 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 at fifthhorseman.net>

diff --git a/doc/gpg.texi b/doc/gpg.texi
index 2915d25..d0aa010 100644
--- a/doc/gpg.texi
+++ b/doc/gpg.texi
@@ -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
diff --git a/g10/import.c b/g10/import.c
index 6d2beaf..b609660 100644
--- a/g10/import.c
+++ b/g10/import.c
@@ -1296,6 +1296,16 @@ 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;
     }

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