wkd: Support option --output for command --check.

* tools/wks-util.c (write_to_file): Rename to ...
(wks_write_to_file): this, make global, and support NULL for fname.
* tools/gpg-wks-client.c (command_check): Write to key.

doc/wks.texi

@@ -189,7 +189,9 @@ fields are (future versions may specify additional fields):
 @itemx -o
 @opindex output
 Write the created mail to @var{file} instead of stdout.  Note that the
-value @code{-} for @var{file} is the same as writing to stdout.
+value @code{-} for @var{file} is the same as writing to stdout.  If
+this option is used with the @option{--check} command and a key was
+found it is written to the given file.
 
 @item --status-fd @var{n}
 @opindex status-fd

tools/gpg-wks-client.c

@@ -1126,6 +1126,19 @@ command_check (char *userid)
                  addrspec);
       err = gpg_error (GPG_ERR_CERT_REVOKED);
     }
+  else if (opt.output)
+    {
+      /* Save to file.  */
+      const char *fname = opt.output;
+
+      if (*fname == '-' && !fname[1])
+        fname = NULL;
+      es_rewind (key);
+      err = wks_write_to_file (key, fname);
+      if (err)
+        log_error ("writing key to '%s' failed: %s\n",
+                   fname? fname : "[stdout]", gpg_strerror (err));
+    }
 
  leave:
   xfree (fpr);

tools/gpg-wks.h

@@ -106,6 +106,7 @@ gpg_error_t wks_send_mime (mime_maker_t mime);
 gpg_error_t wks_parse_policy (policy_flags_t flags, estream_t stream,
                               int ignore_unknown);
 void wks_free_policy (policy_flags_t policy);
+gpg_error_t wks_write_to_file (estream_t src, const char *fname);
 
 gpg_error_t wks_fname_from_userid (const char *userid, int hash_only,
                                    char **r_fname, char **r_addrspec);

tools/wks-util.c

@@ -892,18 +892,27 @@ wks_free_policy (policy_flags_t policy)
 }
 
 
-/* Write the content of SRC to the new file FNAME.  */
-static gpg_error_t
-write_to_file (estream_t src, const char *fname)
+/* Write the content of SRC to the new file FNAME.  If FNAME is NULL
+ * SRC is written to stdout. */
+gpg_error_t
+wks_write_to_file (estream_t src, const char *fname)
 {
   gpg_error_t err;
   estream_t dst;
   char buffer[4096];
   size_t nread, written;
 
-  dst = es_fopen (fname, "wb");
-  if (!dst)
-    return gpg_error_from_syserror ();
+  if (!fname)
+    {
+      dst = es_stdout;
+      es_set_binary (es_stdout);
+    }
+  else
+    {
+      dst = es_fopen (fname, "wb");
+      if (!dst)
+        return gpg_error_from_syserror ();
+    }
 
   do
     {
@@ -918,12 +927,15 @@ write_to_file (estream_t src, const char *fname)
   if (!es_feof (src) || es_ferror (src) || es_ferror (dst))
     {
       err = gpg_error_from_syserror ();
-      es_fclose (dst);
-      gnupg_remove (fname);
+      if (dst != es_stdout)
+        {
+          es_fclose (dst);
+          gnupg_remove (fname);
+        }
       return err;
     }
 
-  if (es_fclose (dst))
+  if (dst != es_stdout && es_fclose (dst))
     {
       err = gpg_error_from_syserror ();
       log_error ("error closing '%s': %s\n", fname, gpg_strerror (err));
@@ -1225,7 +1237,7 @@ wks_install_key_core (estream_t key, const char *addrspec)
     goto leave;
 
   /* Publish.  */
-  err = write_to_file (key, huname);
+  err = wks_write_to_file (key, huname);
   if (err)
     {
       log_error ("copying key to '%s' failed: %s\n", huname,gpg_strerror (err));