gpg: Make card key generation work again.

* g10/call-agent.c (agent_scd_learn): Rename from agent_learn.
(agent_learn): New.
* g10/keygen.c (gen_card_key): Call new agent-learn.
--

Without a shadow key we can't create the self-signatures.  Thus we
need to issue the learn command after each key generation.

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

g10/call-agent.c

@@ -639,9 +639,9 @@ learn_status_cb (void *opaque, const char *line)
   return 0;
 }
 
-/* Call the agent to learn about a smartcard */
+/* Call the scdaemon to learn about a smartcard */
 int
-agent_learn (struct agent_card_info_s *info)
+agent_scd_learn (struct agent_card_info_s *info)
 {
   int rc;
   struct default_inq_parm_s parm;
@@ -677,6 +677,29 @@ agent_learn (struct agent_card_info_s *info)
 }
 
 
+/* 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

@@ -76,7 +76,10 @@ struct agent_card_genkey_s {
 void agent_release_card_info (struct agent_card_info_s *info);
 
 /* Return card info. */
-int agent_learn (struct agent_card_info_s *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/card-util.c

@@ -80,7 +80,7 @@ change_pin (int unblock_v2, int allow_admin)
   struct agent_card_info_s info;
   int rc;
 
-  rc = agent_learn (&info);
+  rc = agent_scd_learn (&info);
   if (rc)
     {
       log_error (_("OpenPGP card not available: %s\n"),
@@ -370,7 +370,7 @@ card_status (estream_t fp, char *serialno, size_t serialnobuflen)
   if (serialno && serialnobuflen)
     *serialno = 0;
 
-  rc = agent_learn (&info);
+  rc = agent_scd_learn (&info);
   if (rc)
     {
       if (opt.with_colons)

g10/keygen.c

@@ -4510,6 +4510,19 @@ gen_card_key (int algo, int keyno, int is_primary, kbnode_t pub_root,
       return err;
     }
 
+  /* 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 ();
+  if (err)
+    {
+      /* Oops: Card removed during generation.  */
+      log_error (_("OpenPGP card not available: %s\n"), gpg_strerror (err));
+      xfree (pkt);
+      xfree (pk);
+      return err;
+    }
+
   if (*timestamp != info.created_at)
     log_info ("NOTE: the key does not use the suggested creation date\n");
   *timestamp = info.created_at;