core: New context flag "auto-key-retrieve"

* src/gpgme.c (gpgme_set_ctx_flag, gpgme_get_ctx_flag): New flag
"auto-key-retrieve".
* src/context.h (gpgme_context): New field auto_key_retrieve.
* src/engine-backend.h (struct engine_ops): Add arg auto_key_retrieve
to field 'decrypt'.
* src/engine-gpg.c (gpg_decrypt): Add arg auto_key_retrieve and pass
option --auto-key-retrieve to gpg.  Adjust all callers.
(gpg_verify): Ditto.
* src/engine-gpgsm.c (gpgsm_decrypt): Add dummy arg auto_key_retrieve.
* src/engine-uiserver.c (uiserver_decrypt): Ditto.
* tests/run-verify.c (main): Add option --auto-key-retrieve.
--

This makes the --auto-key-retrieve option available in the GPGME API.

Test plan:
Run

  GPGME_DEBUG=9:out tests/run-verify SIGNEDFILE

with and without its new option --auto-key-retrieve and check in the
trace stored in "out" whether --auto-key-retrieve was passed to gpg.

Signed-off-by: Werner Koch <[email protected]>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/engine.c b/src/engine.c
index 2c7e625f..28ba9fdf 100644
--- a/src/engine.c
+++ b/src/engine.c
@@ -656,7 +656,8 @@ _gpgme_engine_op_decrypt (engine_t engine,
                           gpgme_decrypt_flags_t flags,
                           gpgme_data_t ciph,
 			  gpgme_data_t plain, int export_session_key,
-                          const char *override_session_key)
+                          const char *override_session_key,
+                          int auto_key_retrieve)
 {
   if (!engine)
     return gpg_error (GPG_ERR_INV_VALUE);
@@ -665,7 +666,8 @@ _gpgme_engine_op_decrypt (engine_t engine,
     return gpg_error (GPG_ERR_NOT_IMPLEMENTED);
 
   return (*engine->ops->decrypt) (engine->engine, flags, ciph, plain,
-                                  export_session_key, override_session_key);
+                                  export_session_key, override_session_key,
+                                  auto_key_retrieve);
 }