CLI: make gpg binary used by libgmime configurable.

Previously we set up a way for the top level notmuch command to choose
which gpg binary was invoked by libgmime. In this commit we add the
(mostly boilerplate) code to allow the notmuch-config command to read
and write this path, and use it in the appropriate struct.

Update tests for new default variable

7 files changed, 56 insertions, 2 deletions

diff --git a/doc/man1/notmuch-config.rst b/doc/man1/notmuch-config.rst
index 2676a86c..40c12721 100644
--- a/doc/man1/notmuch-config.rst
+++ b/doc/man1/notmuch-config.rst
@@ -125,6 +125,14 @@ The available configuration items are described below.
 
         Default: ``true``.
 
+    **crypto.gpg_path**
+
+        Name (or full path) of gpg binary to use in verification and
+        decryption of PGP/MIME messages.
+    
+        Default: ``gpg``.
+
+
 ENVIRONMENT
 ===========
 
diff --git a/notmuch-client.h b/notmuch-client.h
index c25c4ea8..fb3021cc 100644
--- a/notmuch-client.h
+++ b/notmuch-client.h
@@ -279,6 +279,13 @@ notmuch_config_set_database_path (notmuch_config_t *config,
 				  const char *database_path);
 
 const char *
+notmuch_config_get_crypto_gpg_path (notmuch_config_t *config);
+
+void
+notmuch_config_set_crypto_gpg_path (notmuch_config_t *config,
+				  const char *gpg_path);
+
+const char *
 notmuch_config_get_user_name (notmuch_config_t *config);
 
 void
diff --git a/notmuch-config.c b/notmuch-config.c
index a564bcae..2d5c297b 100644
--- a/notmuch-config.c
+++ b/notmuch-config.c
@@ -101,12 +101,21 @@ static const char search_config_comment[] =
     "\t\tsearch results by default.  Using an excluded tag in a\n"
     "\t\tquery will override that exclusion.\n";
 
+static const char crypto_config_comment[] =
+    " Cryptography related configuration\n"
+    "\n"
+    " The following option is supported here:\n"
+    "\n"
+    "\tgpg_path\n"
+    "\t\tbinary name or full path to invoke gpg.\n";
+
 struct _notmuch_config {
     char *filename;
     GKeyFile *key_file;
     notmuch_bool_t is_new;
 
     char *database_path;
+    char *crypto_gpg_path;
     char *user_name;
     char *user_primary_email;
     const char **user_other_email;
@@ -244,6 +253,7 @@ notmuch_config_open (void *ctx,
     int file_had_user_group;
     int file_had_maildir_group;
     int file_had_search_group;
+    int file_had_crypto_group;
 
     notmuch_config_t *config = talloc (ctx, notmuch_config_t);
     if (config == NULL) {
@@ -277,6 +287,7 @@ notmuch_config_open (void *ctx,
     config->maildir_synchronize_flags = TRUE;
     config->search_exclude_tags = NULL;
     config->search_exclude_tags_length = 0;
+    config->crypto_gpg_path = NULL;
 
     if (! g_key_file_load_from_file (config->key_file,
 				     config->filename,
@@ -326,7 +337,7 @@ notmuch_config_open (void *ctx,
     file_had_user_group = g_key_file_has_group (config->key_file, "user");
     file_had_maildir_group = g_key_file_has_group (config->key_file, "maildir");
     file_had_search_group = g_key_file_has_group (config->key_file, "search");
-
+    file_had_crypto_group = g_key_file_has_group (config->key_file, "crypto");
 
     if (notmuch_config_get_database_path (config) == NULL) {
 	char *path = getenv ("MAILDIR");
@@ -406,6 +417,10 @@ notmuch_config_open (void *ctx,
 	g_error_free (error);
     }
 
+    if (notmuch_config_get_crypto_gpg_path (config) == NULL) {
+	notmuch_config_set_crypto_gpg_path (config, "gpg");
+    }
+    
     /* Whenever we know of configuration sections that don't appear in
      * the configuration file, we add some comments to help the user
      * understand what can be done. */
@@ -433,6 +448,10 @@ notmuch_config_open (void *ctx,
 	g_key_file_set_comment (config->key_file, "search", NULL,
 				search_config_comment, NULL);
 
+    if (! file_had_crypto_group)
+	g_key_file_set_comment (config->key_file, "crypto", NULL,
+				crypto_config_comment, NULL);
+
     return config;
 }
 
@@ -690,6 +709,20 @@ notmuch_config_set_search_exclude_tags (notmuch_config_t *config,
 		      &(config->search_exclude_tags));
 }
 
+const char *
+notmuch_config_get_crypto_gpg_path (notmuch_config_t *config)
+{
+    return _config_get (config, &config->crypto_gpg_path, "crypto", "gpg_path");
+}
+
+void
+notmuch_config_set_crypto_gpg_path (notmuch_config_t *config,
+			      const char *gpg_path)
+{
+    _config_set (config, &config->crypto_gpg_path, "crypto", "gpg_path", gpg_path);
+}
+
+
 /* Given a configuration item of the form <group>.<key> return the
  * component group and key. If any error occurs, print a message on
  * stderr and return 1. Otherwise, return 0.
diff --git a/notmuch-reply.c b/notmuch-reply.c
index e18370f8..d51fdfc3 100644
--- a/notmuch-reply.c
+++ b/notmuch-reply.c
@@ -822,6 +822,8 @@ notmuch_reply_command (notmuch_config_t *config, int argc, char *argv[])
 	return EXIT_FAILURE;
     }
 
+    params.crypto.gpgpath = notmuch_config_get_crypto_gpg_path (config);
+
     if (notmuch_database_open (notmuch_config_get_database_path (config),
 			       NOTMUCH_DATABASE_MODE_READ_ONLY, &notmuch))
 	return EXIT_FAILURE;
diff --git a/notmuch-show.c b/notmuch-show.c
index d292f29f..43bf71c8 100644
--- a/notmuch-show.c
+++ b/notmuch-show.c
@@ -1204,6 +1204,8 @@ notmuch_show_command (notmuch_config_t *config, int argc, char *argv[])
 	return EXIT_FAILURE;
     }
 
+    params.crypto.gpgpath = notmuch_config_get_crypto_gpg_path (config);
+
     if (notmuch_database_open (notmuch_config_get_database_path (config),
 			       NOTMUCH_DATABASE_MODE_READ_ONLY, &notmuch))
 	return EXIT_FAILURE;
diff --git a/test/T030-config.sh b/test/T030-config.sh
index ca4cf330..7d14a85f 100755
--- a/test/T030-config.sh
+++ b/test/T030-config.sh
@@ -54,6 +54,7 @@ new.tags=unread;inbox;
 new.ignore=
 search.exclude_tags=
 maildir.synchronize_flags=true
+crypto.gpg_path=gpg
 foo.string=this is another string value
 foo.list=this;is another;list value;"
 
diff --git a/test/T040-setup.sh b/test/T040-setup.sh
index b1972e70..0e9f279a 100755
--- a/test/T040-setup.sh
+++ b/test/T040-setup.sh
@@ -28,6 +28,7 @@ user.other_email=another.suite@example.com;
 new.tags=foo;bar;
 new.ignore=
 search.exclude_tags=baz;
-maildir.synchronize_flags=true"
+maildir.synchronize_flags=true
+crypto.gpg_path=gpg"
 
 test_done