* gpgsm.c: New option --auto-issuer-key-retrieve.

* certpath.c (find_up): Try to retrieve an issuer key from an
external source and from the ephemeral key DB.
(find_up_store_certs_cb): New.

* keydb.c (keydb_set_ephemeral): Does now return the old
state.  Call the backend only when required.

* call-dirmngr.c (start_dirmngr): Use GNUPG_DEFAULT_DIRMNGR.
(lookup_status_cb): Issue status only when CTRL is not NULL.
(gpgsm_dirmngr_lookup): Document that CTRL is optional.

* call-agent.c (start_agent): Use GNUPG_DEFAULT_AGENT.

sm/gpgsm.c

@@ -112,7 +112,7 @@ enum cmd_and_opt_values {
   oPolicyFile,
   oDisablePolicyChecks,
   oEnablePolicyChecks,
-
+  oAutoIssuerKeyRetrieve,
   
 
   oTextmode,
@@ -259,6 +259,9 @@ static ARGPARSE_OPTS opts[] = {
                            N_("do not check certificate policies")},
     { oEnablePolicyChecks, "enable-policy-checks", 0, "@"},
 
+    { oAutoIssuerKeyRetrieve, "auto-issuer-key-retrieve", 0, 
+      N_("fetch missing issuer certificates")},
+
 #if 0
     { oDefRecipient, "default-recipient" ,2,
 				  N_("|NAME|use NAME as default recipient")},
@@ -809,7 +812,10 @@ main ( int argc, char **argv)
         case oEnablePolicyChecks:
           opt.no_policy_check = 0;
           break;
-
+          
+        case oAutoIssuerKeyRetrieve:
+          opt.auto_issuer_key_retrieve = 1;
+          break;
 
         case oOutput: opt.outfile = pargs.r.ret_str; break;