gpg: Let --card--status create a shadow key (card key stub).

* agent/command.c (cmd_learn): Add option --sendinfo.
* agent/learncard.c (agent_handle_learn): Add arg "send" andsend
certifciate only if that is set.
* g10/call-agent.c (agent_scd_learn): Use --sendinfo.  Make INFO
optional.
(agent_learn): Remove.
* g10/keygen.c (gen_card_key): Replace agent_learn by agent_scd_learn.
--

The requirement of using --card-status on the first use of card on a
new box is a bit annoying but the alternative of always checking
whether a card is available before a decryption starts does not sound
promising either.

Signed-off-by: Werner Koch <wk@gnupg.org>

g10/call-agent.c

@@ -655,6 +655,7 @@ agent_scd_learn (struct agent_card_info_s *info)
 {
   int rc;
   struct default_inq_parm_s parm;
+  struct agent_card_info_s dummyinfo;
 
   memset (&parm, 0, sizeof parm);
 
@@ -674,42 +675,25 @@ agent_scd_learn (struct agent_card_info_s *info)
   if (rc)
     return rc;
 
+  if (!info)
+    info = &dummyinfo;
+
   parm.ctx = agent_ctx;
   memset (info, 0, sizeof *info);
-  rc = assuan_transact (agent_ctx, "SCD LEARN --force",
+  rc = assuan_transact (agent_ctx, "LEARN --sendinfo",
                         dummy_data_cb, NULL, default_inq_cb, &parm,
                         learn_status_cb, info);
   /* Also try to get the key attributes.  */
   if (!rc)
     agent_scd_getattr ("KEY-ATTR", info);
 
+  if (info == &dummyinfo)
+    agent_release_card_info (info);
+
   return rc;
 }
 
 
-/* Call the agent to learn about the current smartcard.  This is
-   currently only used to have the agent create the shadow key.  */
-gpg_error_t
-agent_learn (void)
-{
-  gpg_error_t err;
-  struct default_inq_parm_s parm;
-
-  memset (&parm, 0, sizeof parm);
-
-  err = start_agent (NULL, 1);
-  if (err)
-    return err;
-
-  parm.ctx = agent_ctx;
-  err = assuan_transact (agent_ctx, "LEARN",
-                         dummy_data_cb, NULL, default_inq_cb, &parm,
-                         NULL, NULL);
-
-  return err;
-}
-
-
 int
 agent_keytocard (const char *hexgrip, int keyno, int force,
                  const char *serialno, const char *timestamp)

g10/call-agent.h

@@ -78,9 +78,6 @@ void agent_release_card_info (struct agent_card_info_s *info);
 /* Return card info. */
 int agent_scd_learn (struct agent_card_info_s *info);
 
-/* Let the agent learn about the current card.  */
-gpg_error_t agent_learn (void);
-
 /* Update INFO with the attribute NAME. */
 int agent_scd_getattr (const char *name, struct agent_card_info_s *info);
 

g10/keygen.c

@@ -4447,7 +4447,7 @@ gen_card_key (int algo, int keyno, int is_primary, kbnode_t pub_root,
   /* Send the learn command so that the agent creates a shadow key for
      card key.  We need to do that now so that we are able to create
      the self-signatures. */
-  err = agent_learn ();
+  err = agent_scd_learn (NULL);
   if (err)
     {
       /* Oops: Card removed during generation.  */