core: New export mode to export secret subkeys.

* src/gpgme.h.in (GPGME_EXPORT_MODE_SECRET_SUBKEY): New.
* src/export.c (check_mode): Allow new mode and check for invalid
combinations.
(export_keys_start): Return error if new mode flag is set.
* src/engine-gpg.c (export_common): Implement.
* src/gpgme-tool.c (cmd_export): New option --secret-subkey.
* tests/run-export.c (main): New option --secret-subkey.
--

This adds support for exporting secret subkeys (via gpg's
--export-secret-subkeys) to gpgme_op_export[_ext][_start].
The flag is not supported by gpgme_op_export_keys[_start] because
there is no way to specify which subkey(s) to export with these
functions.

GnuPG-bug-id: 5757

1 files changed, 15 insertions, 0 deletions

diff --git a/tests/run-export.c b/tests/run-export.c
index 623c7331..f071b8c2 100644
--- a/tests/run-export.c
+++ b/tests/run-export.c
@@ -128,6 +128,11 @@ main (int argc, char **argv)
           mode |= GPGME_EXPORT_MODE_SECRET;
           argc--; argv++;
         }
+      else if (!strcmp (*argv, "--secret-subkey"))
+        {
+          mode |= GPGME_EXPORT_MODE_SECRET_SUBKEY;
+          argc--; argv++;
+        }
       else if (!strcmp (*argv, "--raw"))
         {
           mode |= GPGME_EXPORT_MODE_RAW;
@@ -168,6 +173,16 @@ main (int argc, char **argv)
       err = gpgme_op_export_ext (ctx, (const char**)argv, mode, out);
       fail_if_err (err);
     }
+  else if ((mode & GPGME_EXPORT_MODE_SECRET_SUBKEY))
+    {
+      keyarray[0] = NULL;
+
+      printf ("exporting secret subkeys!\n");
+
+      gpgme_set_armor (ctx, 1);
+      err = gpgme_op_export_ext (ctx, (const char**)argv, mode, out);
+      fail_if_err (err);
+    }
   else
     {
       /* Lookup the keys as required by the export_keys function.  */