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1 Introduction Tracker is a search engine and that allows the user to find their data as fast as possible. Users can search for their files and search for content in their files too. Tracker is a semantic data storage for desktop and mobile devices. Tracker uses W3C standards for RDF ontologies using Nepomuk with SPARQL to query and update the data. Tracker is a central repository of user information, that provides two big benefits for the desktop; shared data between applications and information which is relational to other information (for example: mixing contacts with files, locations, activities and etc.). This central repository works with a well defined data model that applications can rely on to store and recover their information. That data model is defined using a semantic web artifact called ontology. An ontology defines the relationships between the information stored in the repository. An EU-funded project called Nepomuk was started to define some of the core ontologies to be modelled on the Desktop. Tracker uses this to define the data's relationships in a database. All discussion related to tracker happens on the Tracker mailing list http://mail.gnome.org/mailman/listinfo/tracker-list IRC channel #tracker on: irc.gimp.net Bugs and feature requests should be filed at: http://bugzilla.gnome.org More infomation on Tracker can be found at: http://tracker-project.org. Repository (first is readonly, second is write access): git://git.gnome.org/tracker ssh://<user>@git.gnome.org/git/tracker The official RoadMap (aka TODO) can be found at: http://live.gnome.org/Tracker/Roadmap 2 Use Cases Tracker is the most powerful open source metadata database and indexer framework currently available and because it is built around a combination indexer and sql database and not a dedicated indexer, it has much more powerful use cases: * Provide search and indexing facilities similiar to those on other systems (Windows Vista and Mac OS X). * Common database storage for all first class objects (e.g. a common music/photo/contacts/email/bookmarks/history database) complete with additional metadata and tags/keywords. * Comprehensive one stop solution for all applications needing an object database, powerful search (via RDF Query), first class methods, related metadata and user-definable metadata/tags. * Can provide a full semantic desktop with metadata everywhere. * Can provide powerful criteria-based searching suitable for creating smart file dialogs and vfolder systems. * Can provide a more intelligent desktop using statistical metadata. 3 Features * Desktop-neutral design (it's a freedesktop product built around other freedesktop technologies like D-Bus and XDGMime but contains no GNOME-specific dependencies besides GLib). * Very memory efficient. Unlike some other indexers, Tracker is designed and built to run well on mobile and desktop systems with lower memory (256MB or less). * Non-bloated and written in C for maximum efficiency. * Small size and minimal dependencies makes it easy to bundle into various distros, including live cds. * Provides option to disable indexing when running on battery. * Provides option to index removable devices. * Implements the freedesktop specification for metadata (http://freedesktop.org/wiki/Standards/shared-filemetadata-spec). * Extracts embedded File, Image, Document and Audio type metadata from files. * Supports the WC3's RDF Query syntax for querying metadata * Provides support for both free text search (like Beagle/Google) as well as structured searches using RDF Query. * Responds in real time to file system changes to keep its metadata database up to date and in sync. * Fully extensible with custom metadata - you can store, retrieve, register and search via RDF Query all your own custom metadata. * Can extract a file's contents as plain text and index them. * Can provide thumbnailing on the fly. * It auto-pauses indexing when running low on diskspace. 4 Compilation The git repository contains input to the GNU Autotools however a number of commands need to be run to initialize GNU Autotools in the project directory. To setup the project for compilation after checking it out from the git repository, use: ./autogen.sh --prefix=/usr --sysconfdir=/etc --localstatedir=/var Or if you don't have autogen.sh (i.e. you are using the released tarball), you can use: ./configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var To start compiling the project use: make sudo make install If you install using any other prefix, you might have problems with files not being installed correctly. (You may need to copy and amend the dbus service file to the correct directory and/or might need to update ld_conf if you install into non-standard directories.) 4.1 Notes on Solaris To compile Tracker with GCC on Solaris uses the following commands : CFLAGS="-D_POSIX_PTHREAD_SEMANTICS" ./configure \ --prefix=/usr \ --sysconfdir=/etc \ --localstatedir=/var \ --with-pic make sudo make install To compile Tracker with SUN Studio on Solaris uses the following commands, because there are some problems to compile exiv2 using SUN C++ compiler : CFLAGS="-D_POSIX_PTHREAD_SEMANTICS" ./configure \ --prefix=/usr \ --sysconfdir=/etc \ --localstatedir=/var \ --with-pic \ --disable-exiv2 make sudo make install 4.2 Compile Options Tracker has several compiler options to enable/disable certain features. You can get a full listing by running ./configure --help 5 Running Tracker 5.1 Usage Tracker normally starts itself when users log in. You can indexing by running: $prefix/libexec/tracker-miner-fs You can configure how this works using: $prefix/bin/tracker-preferences You can monitor data miners using: $prefix/bin/tracker-status-icon You can do simple searching using an applet: $prefix/libexec/tracker-search-bar You can do more extensive searching using: $prefix/bin/tracker-search-tool 5.2 Setting Inotify Watch Limit When watching large numbers of folders, its possible to exceed the default number of inotify watches. In order to get real time updates when this value is exceeded it is necessary to increase the number of allowed watches. This can be done as follows: 1. Add this line to /etc/sysctl.conf: "fs.inotify.max_user_watches = (number of folders to be watched; default used to be 8192 and now is 524288)" 2. Reboot the system OR (on a Debian-like system) run "sudo /etc/init.d/procps restart" 6 Further Help 6.1 Man pages Every config file and every binary has a man page. If you start with tracker-store, you should be able to find out about most other commands on the SEE ALSO section. 6.2 Utilities There are a range of tracker utilities that help you query for data.