gpg: Prepare enhancement of agent_probe_secret_key.

* g10/call-agent.c (agent_probe_secret_key): Change semantics of
return value.
* g10/call-agent.h (agent_probe_secret_key): Change comment.
* g10/delkey.c (do_delete_key): Follow the change.
* g10/getkey.c (get_seckey, parse_def_secret_key): Likewise.
(finish_lookup, have_secret_key_with_kid): Likewise.
* g10/gpgv.c (agent_probe_secret_key): Likewise.
* g10/keyedit.c (keyedit_menu, quick_find_keyblock): Likewise.
(show_key_with_all_names_colon): Likewise.
* g10/revoke.c (gen_desig_revoke, gen_revoke): Likewise
* g10/test-stubs.c (agent_probe_secret_key): Likewise.

--

Cherry picked from 2.4 branch of:
	853d5b7677ea01f65c9bc5160cd8509b62f486f7

GnuPG-bug-id: 3416
Signed-off-by: NIIBE Yutaka <[email protected]>

8 files changed, 32 insertions, 26 deletions

diff --git a/g10/call-agent.c b/g10/call-agent.c
index abd6eb34d..4a8a463b6 100644
--- a/g10/call-agent.c
+++ b/g10/call-agent.c
@@ -1783,8 +1783,8 @@ agent_get_s2k_count (unsigned long *r_count)
 
 
 /* Ask the agent whether a secret key for the given public key is
-   available.  Returns 0 if available.  */
-gpg_error_t
+   available.  Returns 0 if not available.  */
+int
 agent_probe_secret_key (ctrl_t ctrl, PKT_public_key *pk)
 {
   gpg_error_t err;
@@ -1803,7 +1803,9 @@ agent_probe_secret_key (ctrl_t ctrl, PKT_public_key *pk)
   xfree (hexgrip);
 
   err = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
-  return err;
+  if (err)
+    return 0;
+  return 1;
 }
 
 /* Ask the agent whether a secret key is available for any of the
diff --git a/g10/call-agent.h b/g10/call-agent.h
index dbc6e2fe9..3728c5ff1 100644
--- a/g10/call-agent.h
+++ b/g10/call-agent.h
@@ -153,8 +153,8 @@ gpg_error_t gpg_agent_get_confirmation (const char *desc);
 gpg_error_t agent_get_s2k_count (unsigned long *r_count);
 
 /* Check whether a secret key for public key PK is available.  Returns
-   0 if the secret key is available. */
-gpg_error_t agent_probe_secret_key (ctrl_t ctrl, PKT_public_key *pk);
+   0 if not available, positive value if the secret key is available. */
+int agent_probe_secret_key (ctrl_t ctrl, PKT_public_key *pk);
 
 /* Ask the agent whether a secret key is availabale for any of the
    keys (primary or sub) in KEYBLOCK.  Returns 0 if available.  */
diff --git a/g10/delkey.c b/g10/delkey.c
index 13dbcf062..83dbeb0f4 100644
--- a/g10/delkey.c
+++ b/g10/delkey.c
@@ -239,7 +239,7 @@ do_delete_key (ctrl_t ctrl, const char *username, int secret, int force,
               if (thiskeyonly && targetnode != node)
                 continue;
 
-              if (agent_probe_secret_key (NULL, node->pkt->pkt.public_key))
+              if (!agent_probe_secret_key (NULL, node->pkt->pkt.public_key))
                 continue;  /* No secret key for that public (sub)key.  */
 
               prompt = gpg_format_keydesc (ctrl,
diff --git a/g10/getkey.c b/g10/getkey.c
index a72545a71..20b717b50 100644
--- a/g10/getkey.c
+++ b/g10/getkey.c
@@ -767,9 +767,11 @@ get_seckey (ctrl_t ctrl, PKT_public_key *pk, u32 *keyid)
 
   if (!err)
     {
-      err = agent_probe_secret_key (/*ctrl*/NULL, pk);
-      if (err)
-	release_public_key_parts (pk);
+      if (!agent_probe_secret_key (/*ctrl*/NULL, pk))
+        {
+          release_public_key_parts (pk);
+          err = gpg_error (GPG_ERR_NO_SECKEY);
+        }
     }
 
   return err;
@@ -2157,10 +2159,12 @@ parse_def_secret_key (ctrl_t ctrl)
               continue;
             }
 
-          err = agent_probe_secret_key (ctrl, pk);
-          if (! err)
-            /* This is a valid key.  */
-            break;
+          if (agent_probe_secret_key (ctrl, pk))
+            {
+              /* This is a valid key.  */
+              err = 0;
+              break;
+            }
         }
       while ((node = find_next_kbnode (node, PKT_PUBLIC_SUBKEY)));
 
@@ -3816,7 +3820,7 @@ finish_lookup (kbnode_t keyblock, unsigned int req_usage, int want_exact,
 	      continue;
 	    }
 
-          if (want_secret && agent_probe_secret_key (NULL, pk))
+          if (want_secret && !agent_probe_secret_key (NULL, pk))
             {
               if (DBG_LOOKUP)
                 log_debug ("\tno secret key\n");
@@ -4565,7 +4569,7 @@ have_secret_key_with_kid (u32 *keyid)
               log_assert (node->pkt->pkttype == PKT_PUBLIC_KEY
                           || node->pkt->pkttype == PKT_PUBLIC_SUBKEY);
 
-              if (!agent_probe_secret_key (NULL, node->pkt->pkt.public_key))
+              if (agent_probe_secret_key (NULL, node->pkt->pkt.public_key))
 		result = 1; /* Secret key available.  */
 	      else
 		result = 0;
diff --git a/g10/gpgv.c b/g10/gpgv.c
index 4e9c35de5..df2f70047 100644
--- a/g10/gpgv.c
+++ b/g10/gpgv.c
@@ -706,12 +706,12 @@ dotlock_remove_lockfiles (void)
 {
 }
 
-gpg_error_t
+int
 agent_probe_secret_key (ctrl_t ctrl, PKT_public_key *pk)
 {
   (void)ctrl;
   (void)pk;
-  return gpg_error (GPG_ERR_NO_SECKEY);
+  return 0;
 }
 
 gpg_error_t
diff --git a/g10/keyedit.c b/g10/keyedit.c
index f2bf6a4d6..01de7bb48 100644
--- a/g10/keyedit.c
+++ b/g10/keyedit.c
@@ -1457,7 +1457,7 @@ keyedit_menu (ctrl_t ctrl, const char *username, strlist_t locusr,
     {
       have_anyseckey = !agent_probe_any_secret_key (ctrl, keyblock);
       if (have_anyseckey
-          && !agent_probe_secret_key (ctrl, keyblock->pkt->pkt.public_key))
+          && agent_probe_secret_key (ctrl, keyblock->pkt->pkt.public_key))
         {
           /* The primary key is also available.   */
           have_seckey = 1;
@@ -2359,7 +2359,8 @@ quick_find_keyblock (ctrl_t ctrl, const char *username, int want_secret,
           /* We require the secret primary key to set the primary UID.  */
           node = find_kbnode (keyblock, PKT_PUBLIC_KEY);
           log_assert (node);
-          err = agent_probe_secret_key (ctrl, node->pkt->pkt.public_key);
+          if (!agent_probe_secret_key (ctrl, node->pkt->pkt.public_key))
+            err = gpg_error (GPG_ERR_NO_SECKEY);
         }
     }
   else if (gpg_err_code (err) == GPG_ERR_NOT_FOUND)
@@ -3460,7 +3461,7 @@ show_key_with_all_names_colon (ctrl_t ctrl, estream_t fp, kbnode_t keyblock)
 	    }
 
 	  keyid_from_pk (pk, keyid);
-          have_seckey = !agent_probe_secret_key (ctrl, pk);
+          have_seckey = agent_probe_secret_key (ctrl, pk);
 
           if (node->pkt->pkttype == PKT_PUBLIC_KEY)
             es_fputs (have_seckey? "sec:" : "pub:", fp);
diff --git a/g10/revoke.c b/g10/revoke.c
index 035a2e9e6..7c01149a8 100644
--- a/g10/revoke.c
+++ b/g10/revoke.c
@@ -315,8 +315,7 @@ gen_desig_revoke (ctrl_t ctrl, const char *uname, strlist_t locusr)
 	      tty_printf(_("(This is a sensitive revocation key)\n"));
 	    tty_printf("\n");
 
-	    rc = agent_probe_secret_key (ctrl, pk2);
-	    if (rc)
+	    if (!agent_probe_secret_key (ctrl, pk2))
 	      {
 		tty_printf (_("Secret key is not available.\n"));
 		continue;
@@ -714,9 +713,9 @@ gen_revoke (ctrl_t ctrl, const char *uname)
     BUG ();
 
   psk = node->pkt->pkt.public_key;
-  rc = agent_probe_secret_key (NULL, psk);
-  if (rc)
+  if (!agent_probe_secret_key (NULL, psk))
     {
+      rc = gpg_error (GPG_ERR_NO_SECKEY);
       log_error (_("secret key \"%s\" not found: %s\n"),
                  uname, gpg_strerror (rc));
       goto leave;
diff --git a/g10/test-stubs.c b/g10/test-stubs.c
index 2ae4a4183..9c4596199 100644
--- a/g10/test-stubs.c
+++ b/g10/test-stubs.c
@@ -463,12 +463,12 @@ dotlock_remove_lockfiles (void)
 {
 }
 
-gpg_error_t
+int
 agent_probe_secret_key (ctrl_t ctrl, PKT_public_key *pk)
 {
   (void)ctrl;
   (void)pk;
-  return gpg_error (GPG_ERR_NO_SECKEY);
+  return 0;
 }
 
 gpg_error_t