gpg: Warn about (but don't fail) on scdaemon options in gpg.conf.

* g10/gpg.c: Add config options that should belong in scdaemon.conf
* g10/main.h, g10/misc.c (obsolete_scdaemon_option): New.

--

In gpg2, the following options are only relevant for scdaemon:

 reader-port
 ctapi-driver
 pcsc-driver
 disable-ccid

but in gpg1, they are options for gpg itself.

Some users of gpg1 might have these options in their
~/.gnupg/gpg.conf, which causes gpg2 to fail hard if it reads that
config file.

gpg2 should not fail hard, though giving a warning (and suggesting a
move to scdaemon.conf) seems OK.

This patch does *not* reintroduce any documentation for these options
in gpg.texi, even to indicate that they are "dummy" options, since
scdaemon.texi contains the appropriate documentation.

Debian-bug-id: 762844

Program names factored out from obsolete_scdaemon_option to make
reuse without new translations easier. -wk

This is a backport of commit 371c2b14b0
with parts of 20c6da50d4 but without those
which would change existing translated strings. -wk

g10/gpg.c

@@ -358,6 +358,10 @@ enum cmd_and_opt_values
     oKeyidFormat,
     oExitOnStatusWriteError,
     oLimitCardInsertTries,
+    oReaderPort,
+    octapiDriver,
+    opcscDriver,
+    oDisableCCID,
     oRequireCrossCert,
     oNoRequireCrossCert,
     oAutoKeyLocate,
@@ -506,10 +510,6 @@ static ARGPARSE_OPTS opts[] = {
   ARGPARSE_s_n (oDryRun, "dry-run", N_("do not make any changes")),
   ARGPARSE_s_n (oInteractive, "interactive", N_("prompt before overwriting")),
 
-  ARGPARSE_s_n (oUseAgent,      "use-agent", "@"),
-  ARGPARSE_s_n (oNoUseAgent, "no-use-agent", "@"),
-  ARGPARSE_s_s (oGpgAgentInfo, "gpg-agent-info", "@"),
-
   ARGPARSE_s_n (oBatch, "batch", "@"),
   ARGPARSE_s_n (oAnswerYes, "yes", "@"),
   ARGPARSE_s_n (oAnswerNo, "no", "@"),
@@ -761,6 +761,21 @@ static ARGPARSE_OPTS opts[] = {
   ARGPARSE_s_s (oAutoKeyLocate, "auto-key-locate", "@"),
   ARGPARSE_s_n (oNoAutoKeyLocate, "no-auto-key-locate", "@"),
 
+  /* Dummy options with warnings.  */
+  ARGPARSE_s_n (oUseAgent,      "use-agent", "@"),
+  ARGPARSE_s_n (oNoUseAgent, "no-use-agent", "@"),
+  ARGPARSE_s_s (oGpgAgentInfo, "gpg-agent-info", "@"),
+  ARGPARSE_s_s (oReaderPort, "reader-port", "@"),
+  ARGPARSE_s_s (octapiDriver, "ctapi-driver", "@"),
+  ARGPARSE_s_s (opcscDriver, "pcsc-driver", "@"),
+  ARGPARSE_s_n (oDisableCCID, "disable-ccid", "@"),
+
+  /* Dummy options.  */
+  ARGPARSE_s_n (oNoop, "sk-comments", "@"),
+  ARGPARSE_s_n (oNoop, "no-sk-comments", "@"),
+  ARGPARSE_s_n (oNoop, "compress-keys", "@"),
+  ARGPARSE_s_n (oNoop, "compress-sigs", "@"),
+
   ARGPARSE_end ()
 };
 
@@ -2239,6 +2254,19 @@ main (int argc, char **argv)
 	    obsolete_option (configname, configlineno, "--gpg-agent-info");
             break;
 
+          case oReaderPort:
+	    obsolete_scdaemon_option (configname, configlineno, "reader-port");
+            break;
+          case octapiDriver:
+	    obsolete_scdaemon_option (configname, configlineno, "ctapi-driver");
+            break;
+          case opcscDriver:
+	    obsolete_scdaemon_option (configname, configlineno, "pcsc-driver");
+            break;
+          case oDisableCCID:
+	    obsolete_scdaemon_option (configname, configlineno, "disable-ccid");
+            break;
+
 	  case oAnswerYes: opt.answer_yes = 1; break;
 	  case oAnswerNo: opt.answer_no = 1; break;
 	  case oKeyring: append_to_strlist( &nrings, pargs.r.ret_str); break;

g10/main.h

@@ -118,6 +118,8 @@ void deprecated_warning(const char *configname,unsigned int configlineno,
 void deprecated_command (const char *name);
 void obsolete_option (const char *configname, unsigned int configlineno,
                       const char *name);
+void obsolete_scdaemon_option (const char *configname,
+                               unsigned int configlineno, const char *name);
 
 int string_to_cipher_algo (const char *string);
 int string_to_digest_algo (const char *string);

g10/misc.c

@@ -851,6 +851,20 @@ obsolete_option (const char *configname, unsigned int configlineno,
 }
 
 
+void
+obsolete_scdaemon_option (const char *configname, unsigned int configlineno,
+                          const char *name)
+{
+  if (configname)
+    log_info (_("%s:%u: \"%s%s\" is obsolete in this file"
+                " - it only has effect in %s\n"),
+              configname, configlineno, name, "--", "scdaemon.conf");
+  else
+    log_info (_("WARNING: \"%s%s\" is an obsolete option"
+                " - it has no effect except on %s\n"), "--", name, "scdaemon");
+}
+
+
 /*
  * Wrapper around gcry_cipher_map_name to provide a fallback using the
  * "Sn" syntax as used by the preference strings.