[tracker-miners/wip/carlosg/stable-urn-cache-init] tracker-extract: Initialize cache for stable content URNs at startup

[Carlos Garnacho <carlosg src gnome org>]

commit 4cda983b02e49f6bd28b94a6b96c9fe7026887ef
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Mar 16 13:47:50 2022 +0100

    tracker-extract: Initialize cache for stable content URNs at startup
    
    This cache initialization may incur in unexpected ioctls to probe
    floppy/cdrom devices, and is nowadays left up to the first extractor
    thread that queries a content identifier. This may result in seccomp
    issues.
    
    Perform this initialization on the main thread early during initialization
    so the extractor threads find a populated cache when querying content
    identifiers.
    
    Fixes: https://gitlab.gnome.org/GNOME/tracker/-/issues/355

 src/libtracker-miners-common/tracker-file-utils.c | 9 +++++++++
 src/libtracker-miners-common/tracker-file-utils.h | 2 ++
 src/tracker-extract/tracker-main.c                | 2 ++
 3 files changed, 13 insertions(+)
---
diff --git a/src/libtracker-miners-common/tracker-file-utils.c 
b/src/libtracker-miners-common/tracker-file-utils.c
index 8faa80713..ddc0e4c57 100644
--- a/src/libtracker-miners-common/tracker-file-utils.c
+++ b/src/libtracker-miners-common/tracker-file-utils.c
@@ -852,6 +852,15 @@ tracker_unix_mount_cache_lookup_filesystem_id (GFile *file)
        return id;
 }
 
+void
+tracker_content_identifier_cache_init (void)
+{
+       TrackerUnixMountCache *cache;
+
+       cache = tracker_unix_mount_cache_get ();
+       g_assert (cache != NULL);
+}
+
 gchar *
 tracker_file_get_content_identifier (GFile       *file,
                                      GFileInfo   *info,
diff --git a/src/libtracker-miners-common/tracker-file-utils.h 
b/src/libtracker-miners-common/tracker-file-utils.h
index f05535a41..6a0b1495d 100644
--- a/src/libtracker-miners-common/tracker-file-utils.h
+++ b/src/libtracker-miners-common/tracker-file-utils.h
@@ -44,6 +44,8 @@ gboolean tracker_file_is_locked                             (GFile       *file);
 gboolean tracker_file_is_hidden                             (GFile       *file);
 gint     tracker_file_cmp                                   (GFile       *file_a,
                                                              GFile       *file_b);
+
+void     tracker_content_identifier_cache_init              (void);
 gchar *  tracker_file_get_content_identifier                (GFile       *file,
                                                              GFileInfo   *info,
                                                              const gchar *suffix);
diff --git a/src/tracker-extract/tracker-main.c b/src/tracker-extract/tracker-main.c
index c1a09685c..9aae5f6fd 100644
--- a/src/tracker-extract/tracker-main.c
+++ b/src/tracker-extract/tracker-main.c
@@ -368,6 +368,8 @@ main (int argc, char *argv[])
                return EXIT_FAILURE;
        }
 
+       tracker_content_identifier_cache_init ();
+
        cache_dir = get_cache_dir (domain_ontology);
        tracker_error_report_init (cache_dir);
        g_object_unref (cache_dir);