[tracker/sam/debug-help] libtracker-sparql: Call tracker_get_debug_flags() on connection construct

[Sam Thursfield <sthursfield src gnome org>]

commit b1d468b453d014d543f0a15876f937a7004c8693
Author: Sam Thursfield <sam afuera me uk>
Date:   Tue Dec 1 14:13:47 2020 +0100

    libtracker-sparql: Call tracker_get_debug_flags() on connection construct
    
    This ensures our TRACKER_DEBUG=help functionality always works.

 src/libtracker-common/libtracker-common.vapi |  3 +++
 src/libtracker-sparql/tracker-backend.vala   | 10 ++++++++++
 2 files changed, 13 insertions(+)
---
diff --git a/src/libtracker-common/libtracker-common.vapi b/src/libtracker-common/libtracker-common.vapi
index 9640b1999..9e4298897 100644
--- a/src/libtracker-common/libtracker-common.vapi
+++ b/src/libtracker-common/libtracker-common.vapi
@@ -97,6 +97,9 @@ namespace Tracker {
        [CCode (cheader_filename = "libtracker-common/tracker-common.h")]
        public void ioprio_init ();
 
+       [CCode (cheader_filename = "libtracker-common/tracker-debug.h")]
+       public uint get_debug_flags ();
+
        [CCode (cname = "g_message", cheader_filename = "glib.h")]
        [PrintfFormat]
        public void message (string format, ...);
diff --git a/src/libtracker-sparql/tracker-backend.vala b/src/libtracker-sparql/tracker-backend.vala
index 9a84a648a..7ae95eaf8 100644
--- a/src/libtracker-sparql/tracker-backend.vala
+++ b/src/libtracker-sparql/tracker-backend.vala
@@ -17,7 +17,13 @@
  * Boston, MA  02110-1301, USA.
  */
 
+/* All apps using libtracker-sparql will call one of these constructors, so
+ * we take the opportunity to call tracker_get_debug_flags(). This has the
+ * effect of printing the 'help' message if TRACKER_DEBUG=help is set.
+ */
+
 public static Tracker.Sparql.Connection tracker_sparql_connection_remote_new (string url_base) {
+       Tracker.get_debug_flags ();
        return new Tracker.Remote.Connection (url_base);
 }
 
@@ -25,6 +31,8 @@ public static Tracker.Sparql.Connection tracker_sparql_connection_bus_new (strin
        GLib.DBusConnection dbus_conn;
        string path;
 
+       Tracker.get_debug_flags ();
+
        if (conn != null)
                dbus_conn = conn;
        else
@@ -39,12 +47,14 @@ public static Tracker.Sparql.Connection tracker_sparql_connection_bus_new (strin
 }
 
 public static Tracker.Sparql.Connection tracker_sparql_connection_new (Tracker.Sparql.ConnectionFlags flags, 
File? store, File? ontology, Cancellable? cancellable = null) throws GLib.Error, Tracker.Sparql.Error, 
IOError {
+       Tracker.get_debug_flags ();
        var conn = new Tracker.Direct.Connection (flags, store, ontology);
        conn.init (cancellable);
        return conn;
 }
 
 public static async Tracker.Sparql.Connection tracker_sparql_connection_new_async 
(Tracker.Sparql.ConnectionFlags flags, File? store, File ontology, Cancellable? cancellable = null) throws 
GLib.Error, Tracker.Sparql.Error, IOError {
+       Tracker.get_debug_flags ();
        var conn = new Tracker.Direct.Connection (flags, store, ontology);
        yield conn.init_async (Priority.DEFAULT, cancellable);
        return conn;