agent: Default to extended key format.

* agent/gpg-agent.c (oDisableExtendedKeyFormat, oNoop): New.
(oEnableExtendedKeyFormat): Remove.
(opts): Make --enable-extended-key-format a dummy option.  Add
disable-extended-key-format.
(parse_rereadable_options): Implement oDisableExtendedKeyFormat.
--

Extended key format is supported since vesion 2.1.12 which should have
long been replaced by a newer version inh all installations.  Thus for
2.3 we will make use of the extended-key-format by default.

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

agent/gpg-agent.c

@@ -112,7 +112,7 @@ enum cmd_and_opt_values
   oCheckPassphrasePattern,
   oMaxPassphraseDays,
   oEnablePassphraseHistory,
-  oEnableExtendedKeyFormat,
+  oDisableExtendedKeyFormat,
   oUseStandardSocket,
   oNoUseStandardSocket,
   oExtraSocket,
@@ -139,7 +139,9 @@ enum cmd_and_opt_values
   oAutoExpandSecmem,
   oListenBacklog,
 
-  oWriteEnvFile
+  oWriteEnvFile,
+
+  oNoop
 };
 
 
@@ -251,7 +253,7 @@ static ARGPARSE_OPTS opts[] = {
                 /* */           "@"
 #endif
                 ),
-  ARGPARSE_s_n (oEnableExtendedKeyFormat, "enable-extended-key-format", "@"),
+  ARGPARSE_s_n (oDisableExtendedKeyFormat, "disable-extended-key-format", "@"),
 
   ARGPARSE_s_u (oS2KCount, "s2k-count", "@"),
   ARGPARSE_s_u (oS2KCalibration, "s2k-calibration", "@"),
@@ -265,6 +267,10 @@ static ARGPARSE_OPTS opts[] = {
   ARGPARSE_s_n (oUseStandardSocket, "use-standard-socket", "@"),
   ARGPARSE_s_n (oNoUseStandardSocket, "no-use-standard-socket", "@"),
 
+  /* Dummy options.  */
+  ARGPARSE_s_n (oNoop, "enable-extended-key-format", "@"),
+
+
   ARGPARSE_end () /* End of list */
 };
 
@@ -825,7 +831,7 @@ parse_rereadable_options (ARGPARSE_ARGS *pargs, int reread)
       opt.check_passphrase_pattern = NULL;
       opt.max_passphrase_days = MAX_PASSPHRASE_DAYS;
       opt.enable_passphrase_history = 0;
-      opt.enable_extended_key_format = 0;
+      opt.enable_extended_key_format = 1;
       opt.ignore_cache_for_signing = 0;
       opt.allow_mark_trusted = 1;
       opt.allow_external_cache = 1;
@@ -900,9 +906,7 @@ parse_rereadable_options (ARGPARSE_ARGS *pargs, int reread)
       opt.enable_passphrase_history = 1;
       break;
 
-    case oEnableExtendedKeyFormat:
-      opt.enable_extended_key_format = 1;
-      break;
+    case oDisableExtendedKeyFormat: opt.enable_extended_key_format = 0; break;
 
     case oIgnoreCacheForSigning: opt.ignore_cache_for_signing = 1; break;
 
@@ -936,6 +940,8 @@ parse_rereadable_options (ARGPARSE_ARGS *pargs, int reread)
       set_s2k_calibration_time (pargs->r.ret_ulong);
       break;
 
+    case oNoop: break;
+
     default:
       return 0; /* not handled */
     }
@@ -1451,8 +1457,6 @@ main (int argc, char **argv )
                  GC_OPT_FLAG_NONE|GC_OPT_FLAG_RUNTIME);
       es_printf ("pinentry-timeout:%lu:0:\n",
                  GC_OPT_FLAG_DEFAULT|GC_OPT_FLAG_RUNTIME);
-      es_printf ("enable-extended-key-format:%lu:\n",
-                 GC_OPT_FLAG_NONE|GC_OPT_FLAG_RUNTIME);
       es_printf ("grab:%lu:\n",
                  GC_OPT_FLAG_NONE|GC_OPT_FLAG_RUNTIME);
 

doc/gpg-agent.texi

@@ -585,16 +585,16 @@ local gpg-agent and use its private keys.  This enables decrypting or
 signing data on a remote machine without exposing the private keys to the
 remote machine.
 
-@anchor{option --enable-extended-key-format}
-@item --enable-extended-key-format
-@opindex enable-extended-key-format
-This option creates keys in the extended private key format.  Changing
-the passphrase of a key will also convert the key to that new format.
-Using this option makes the private keys unreadable for gpg-agent
-versions before 2.1.12.  The advantage of the extended private key
-format is that it is text based and can carry additional meta data.
-Note that this option also changes the key protection format to use
-OCB mode.
+@item --disable-extended-key-format
+@opindex disable-extended-key-format
+Since version 2.3 keys are created in the extended private key format.
+Changing the passphrase of a key will also convert the key to that new
+format.  This new key format is supported since GnuPG version 2.1.12
+and thus there should be no need to disable it.  However, this options
+allows to revert to the old behaviour for new keys; be aware that keys
+are never migrated back to the old format.  The advantage of the
+extended private key format is that it is text based and can carry
+additional meta data.
 
 @anchor{option --enable-ssh-support}
 @item --enable-ssh-support

tools/gpgconf-comp.c

@@ -508,9 +508,6 @@ static gc_option_t gc_options_gpg_agent[] =
    { "enable-putty-support", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
      "gnupg", "enable putty support",
      GC_ARG_TYPE_NONE, GC_BACKEND_GPG_AGENT },
-   { "enable-extended-key-format", GC_OPT_FLAG_RUNTIME, GC_LEVEL_INVISIBLE,
-     NULL, NULL,
-     GC_ARG_TYPE_NONE, GC_BACKEND_GPG_AGENT },
 
    { "Debug",
      GC_OPT_FLAG_GROUP, GC_LEVEL_ADVANCED,