core: Add trust-model flag

* src/context.h (gpgme_context): Extend with trust_model.
* src/engine-gpg.c (engine_gpg): Extend with trust_model.
(gpg_set_engine_flags): Take trust_model from context.
(build_argv): Handle trust_model.
(gpg_release): Free trust_model.
* src/gpgme.c (gpgme_set_ctx_flag): Handle trust-model flag.
(gpgme_release): Release trust-model.
* doc/gpgme.texi: Document new flag for gpgme_set_ctx_flag.
(Context Flags): New subsection for the context flags.
* tests/run-keylist.c (show_usage, main): Add new --trust-model
parameter.

--
This gives a GPGME user fine grained control over the
trust-model.

Changing the trust model for only a single application depends
on:
GnuPG-Bug-Id: T4134
Maniphest Tasks: T4134
Differential Revision: https://dev.gnupg.org/D466

1 files changed, 8 insertions, 0 deletions

diff --git a/src/gpgme.c b/src/gpgme.c
index 2d829d9b..3d72f695 100644
--- a/src/gpgme.c
+++ b/src/gpgme.c
@@ -250,6 +250,7 @@ gpgme_release (gpgme_ctx_t ctx)
   free (ctx->override_session_key);
   free (ctx->request_origin);
   free (ctx->auto_key_locate);
+  free (ctx->trust_model);
   _gpgme_engine_info_release (ctx->engine_info);
   ctx->engine_info = NULL;
   DESTROY_LOCK (ctx->lock);
@@ -554,6 +555,13 @@ gpgme_set_ctx_flag (gpgme_ctx_t ctx, const char *name, const char *value)
       if (!ctx->auto_key_locate)
         err = gpg_error_from_syserror ();
     }
+  else if (!strcmp (name, "trust-model"))
+    {
+      free (ctx->trust_model);
+      ctx->trust_model = strdup (value);
+      if (!ctx->trust_model)
+        err = gpg_error_from_syserror ();
+    }
   else
     err = gpg_error (GPG_ERR_UNKNOWN_NAME);