[tracker/external-crawler: 42/42] libtracker-control: Allow miner status to be gained from running processes

[Martyn James Russell <mr src gnome org>]

commit e5b5280b5f336b80b00d9c9671a72391ab1f0a9b
Author: Martyn Russell <martyn lanedo com>
Date:   Thu Jul 17 19:32:32 2014 +0100

    libtracker-control: Allow miner status to be gained from running processes
    
    Using environment variable: TRACKER_MINERS_DIR_DISABLED

 docs/manpages/tracker-control.1                |   16 ++++++++
 src/libtracker-control/tracker-miner-manager.c |   46 +++++++++++++++++++++++-
 2 files changed, 61 insertions(+), 1 deletions(-)
---
diff --git a/docs/manpages/tracker-control.1 b/docs/manpages/tracker-control.1
index 5ee33c2..76ea639 100644
--- a/docs/manpages/tracker-control.1
+++ b/docs/manpages/tracker-control.1
@@ -225,5 +225,21 @@ The COOKIE is given by a successful
 command. It is a number which identifies each pause request. When all
 pauses have been resumed, the miner will resume working.
 
+.SH ENVIRONMENT
+.TP
+.B TRACKER_MINERS_DIR
+Miners that are installed should have a .desktop file in
+/usr/share/tracker/miners/, this is how tracker-control knows about
+miners which exist but may not have not been started. This environment
+variable allows the location that miner .desktop files are loaded from
+to be overridden by setting it to a new path.
+.TP
+.B TRACKER_MINERS_DIR_DISABLED
+If you don't have .desktop files for miners, you can use this
+environment variable to get status information from \fBRUNNING\fR
+processes. This doesn't give any indication for miners \fBNOT\fR
+running. This uses registered miners on DBus to know about existing
+Tracker based data miners.
+
 .SH SEE ALSO
 .BR tracker-store (1).
diff --git a/src/libtracker-control/tracker-miner-manager.c b/src/libtracker-control/tracker-miner-manager.c
index 573b201..8928487 100644
--- a/src/libtracker-control/tracker-miner-manager.c
+++ b/src/libtracker-control/tracker-miner-manager.c
@@ -683,6 +683,41 @@ tracker_miner_manager_get_running (TrackerMinerManager *manager)
 }
 
 static void
+load_running_miners_only (TrackerMinerManager *manager)
+{
+       TrackerMinerManagerPrivate *priv;
+       GSList *running, *l;
+       gint prefix_len;
+
+       priv = TRACKER_MINER_MANAGER_GET_PRIVATE (manager);
+
+       running = tracker_miner_manager_get_running (manager);
+       prefix_len = strlen (TRACKER_MINER_DBUS_NAME_PREFIX);
+
+       for (l = running; l; l = l->next) {
+               MinerData *data;
+               const gchar *dbus_name;
+               gchar *p;
+
+               dbus_name = l->data;
+               data = g_slice_new0 (MinerData);
+               data->dbus_path = g_strdup_printf ("/%s", dbus_name);
+
+               p = data->dbus_path;
+               while ((p = strchr (p, '.')) != NULL) {
+                       *p++ = '/';
+               }
+
+               data->dbus_name = l->data;
+               data->display_name = g_strdup (dbus_name + prefix_len);
+               data->description = g_strdup (data->display_name);
+               priv->miners = g_list_prepend (priv->miners, data);
+       }
+
+       g_slist_free (running);
+}
+
+static void
 check_file (GFile    *file,
             gpointer  user_data)
 {
@@ -774,7 +809,16 @@ static void
 initialize_miners_data (TrackerMinerManager *manager)
 {
        GFile *file;
-       const gchar *miners_dir;
+       const gchar *miners_dir, *miners_dir_disabled;
+
+       miners_dir_disabled = g_getenv ("TRACKER_MINERS_DIR_DISABLED");
+       if (G_UNLIKELY (miners_dir_disabled != NULL)) {
+               miners_dir = TRACKER_MINERS_DIR;
+               g_message ("Crawling miners found on DBus not from .desktop files (set in env)");
+
+               load_running_miners_only (manager);
+               return;
+       }
 
        /* Go through service files */
        miners_dir = g_getenv ("TRACKER_MINERS_DIR");