gpg: New command "openpgp" for --card-edit.

* g10/card-util.c (current_card_status): Print a hint for fishy
outputs.
(enum cmdids): Add cmdOPENPGP.
(cmds): Add "openpgp".
(card_edit): Implement that command.
--

If a Yubikey has been used in PIV mode the initial listing does not
look correct.  Although we explicitly switch to the OpenPGP app when
needed, we don't want to do this in listing mode.  Instead we offer a
new command "openpgp" to force the openpgp mode.  The ultimate goal
will be to enhance the gpg-card tool to completely take over the
--card-edit features.  But we are not yet there.

GnuPG-bug-id: 6462

g10/card-util.c

@@ -705,6 +705,14 @@ current_card_status (ctrl_t ctrl, estream_t fp,
         }
       else
         tty_fprintf (fp, "[none]\n");
+
+      if (!info.manufacturer_name)
+        {
+          tty_fprintf (fp, "\n");
+          tty_fprintf (fp, _("Please try command \"%s\""
+                             " if the listing does not look correct\n"),
+                       "openpgp");
+        }
     }
 
   release_kbnode (keyblock);
@@ -2243,7 +2251,7 @@ enum cmdids
     cmdNAME, cmdURL, cmdFETCH, cmdLOGIN, cmdLANG, cmdSEX, cmdCAFPR,
     cmdFORCESIG, cmdGENERATE, cmdPASSWD, cmdPRIVATEDO, cmdWRITECERT,
     cmdREADCERT, cmdUNBLOCK, cmdFACTORYRESET, cmdKDFSETUP,
-    cmdKEYATTR, cmdUIF,
+    cmdKEYATTR, cmdUIF, cmdOPENPGP,
     cmdINVCMD
   };
 
@@ -2281,6 +2289,7 @@ static struct
       N_("setup KDF for PIN authentication (on/single/off)")},
     { "key-attr", cmdKEYATTR, 1, N_("change the key attribute")},
     { "uif", cmdUIF, 1, N_("change the User Interaction Flag")},
+    { "openpgp", cmdOPENPGP, 0, N_("switch to the OpenPGP app")},
     /* Note, that we do not announce these command yet. */
     { "privatedo", cmdPRIVATEDO, 0, NULL },
     { "readcert", cmdREADCERT, 0, NULL },
@@ -2580,6 +2589,11 @@ card_edit (ctrl_t ctrl, strlist_t commands)
             uif (arg_number, arg_rest);
           break;
 
+        case cmdOPENPGP:
+          agent_scd_switchapp ("openpgp");
+          redisplay = 1;
+          break;
+
         case cmdQUIT:
           goto leave;