agent: Add option --allow-emacs-pinentry

* agent/agent.h (opt): Add field allow_emacs_pinentry.
* agent/call-pinentry.c (start_pinentry): Act upon new var.
* agent/gpg-agent.c (oAllowEmacsPinentry): New.
(opts): Add option --allow-emacs-pinentry.
(parse_rereadable_options): Set this option.
* tools/gpgconf-comp.c (gc_options_gpg_agent): Add new option.
--

gpgconf-comp and manual entry added by wk.

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

3 files changed, 23 insertions, 0 deletions

diff --git a/agent/agent.h b/agent/agent.h
index dbbf68922..ab8dc9f22 100644
--- a/agent/agent.h
+++ b/agent/agent.h
@@ -133,6 +133,10 @@ struct
      to allow it to enable such a cache.  */
   int allow_external_cache;
 
+  /* If this global option is true, the Assuan option of Pinentry
+     allow-emacs-prompt is allowed.  */
+  int allow_emacs_pinentry;
+
   int keep_tty;      /* Don't switch the TTY (for pinentry) on request */
   int keep_display;  /* Don't switch the DISPLAY (for pinentry) on request */
 
diff --git a/agent/call-pinentry.c b/agent/call-pinentry.c
index 018a609a3..ba40f4dc1 100644
--- a/agent/call-pinentry.c
+++ b/agent/call-pinentry.c
@@ -423,6 +423,16 @@ start_pinentry (ctrl_t ctrl)
         return unlock_pinentry (rc);
     }
 
+  if (opt.allow_emacs_pinentry)
+    {
+      /* Indicate to the pinentry that it may read passphrase through
+	 Emacs minibuffer, if possible.  */
+      rc = assuan_transact (entry_ctx, "OPTION allow-emacs-prompt",
+                            NULL, NULL, NULL, NULL, NULL, NULL);
+      if (rc && gpg_err_code (rc) != GPG_ERR_UNKNOWN_OPTION)
+        return unlock_pinentry (rc);
+    }
+
 
   {
     /* Provide a few default strings for use by the pinentries.  This
diff --git a/agent/gpg-agent.c b/agent/gpg-agent.c
index 659aa2c29..2acb65063 100644
--- a/agent/gpg-agent.c
+++ b/agent/gpg-agent.c
@@ -120,6 +120,7 @@ enum cmd_and_opt_values
   oAllowPresetPassphrase,
   oAllowLoopbackPinentry,
   oNoAllowExternalCache,
+  oAllowEmacsPinentry,
   oKeepTTY,
   oKeepDISPLAY,
   oSSHSupport,
@@ -214,6 +215,8 @@ static ARGPARSE_OPTS opts[] = {
                 /* */                    N_("allow presetting passphrase")),
   ARGPARSE_s_n (oAllowLoopbackPinentry, "allow-loopback-pinentry",
                                    N_("allow caller to override the pinentry")),
+  ARGPARSE_s_n (oAllowEmacsPinentry,  "allow-emacs-pinentry",
+                /* */    N_("allow passphrase to be prompted through Emacs")),
 
   ARGPARSE_s_n (oSSHSupport,   "enable-ssh-support", N_("enable ssh support")),
   ARGPARSE_s_n (oPuttySupport, "enable-putty-support",
@@ -565,6 +568,7 @@ parse_rereadable_options (ARGPARSE_ARGS *pargs, int reread)
       opt.ignore_cache_for_signing = 0;
       opt.allow_mark_trusted = 1;
       opt.allow_external_cache = 1;
+      opt.allow_emacs_pinentry = 0;
       opt.disable_scdaemon = 0;
       disable_check_own_socket = 0;
       return 1;
@@ -634,6 +638,9 @@ parse_rereadable_options (ARGPARSE_ARGS *pargs, int reread)
     case oNoAllowExternalCache: opt.allow_external_cache = 0;
       break;
 
+    case oAllowEmacsPinentry: opt.allow_emacs_pinentry = 1;
+      break;
+
     default:
       return 0; /* not handled */
     }
@@ -1080,6 +1087,8 @@ main (int argc, char **argv )
 #endif
       es_printf ("allow-loopback-pinentry:%lu:\n",
                  GC_OPT_FLAG_NONE|GC_OPT_FLAG_RUNTIME);
+      es_printf ("allow-emacs-pinentry:%lu:\n",
+                 GC_OPT_FLAG_NONE|GC_OPT_FLAG_RUNTIME);
 
       agent_exit (0);
     }