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 <[email protected]>

1 files changed, 10 insertions, 5 deletions

diff --git a/agent/command.c b/agent/command.c
index 3e8066381..c875f5516 100644
--- a/agent/command.c
+++ b/agent/command.c
@@ -1619,21 +1619,26 @@ cmd_get_confirmation (assuan_context_t ctx, char *line)
 
 
 static const char hlp_learn[] =
-  "LEARN [--send]\n"
+  "LEARN [--send][--sendinfo]\n"
   "\n"
   "Learn something about the currently inserted smartcard.  With\n"
-  "--send the new certificates are send back.";
+  "--sendinfo information about the card is returned; with --send\n"
+  "the available certificates are returned as D lines.";
 static gpg_error_t
 cmd_learn (assuan_context_t ctx, char *line)
 {
   ctrl_t ctrl = assuan_get_pointer (ctx);
-  int rc;
+  gpg_error_t err;
+  int send, sendinfo;
+
+  send = has_option (line, "--send");
+  sendinfo = send? 1 : has_option (line, "--sendinfo");
 
   if (ctrl->restricted)
     return leave_cmd (ctx, gpg_error (GPG_ERR_FORBIDDEN));
 
-  rc = agent_handle_learn (ctrl, has_option (line, "--send")? ctx : NULL);
-  return leave_cmd (ctx, rc);
+  err = agent_handle_learn (ctrl, send, sendinfo? ctx : NULL);
+  return leave_cmd (ctx, err);
 }