%general-entities; ]> $LastChangedBy$ $Date$ D-Bus D-Bus is a message bus system, a simple way for applications to talk to one another. D-Bus supplies both a system daemon (for events such as new hardware device added or printer queue changed) and a per-user-login-session daemon (for general IPC needs among user applications). Also, the message bus is built on top of a general one-to-one message passing framework, which can be used by any two applications to communicate directly (without going through the message bus daemon). Even though D-Bus was built in LFS, there are some features provided by the package that other BLFS packages need, but their dependencies didn't fit into LFS. &lfs80_checked; Package Information Download (HTTP): Download (FTP): Download MD5 sum: &dbus-md5sum; Download size: &dbus-size; Estimated disk space required: &dbus-buildsize; Estimated build time: &dbus-time; D-Bus Dependencies Recommended (for dbus-launch program) Optional For the tests: , , , and ; for documentation: , , Ducktype, and Yelp Tools User Notes: If they do not already exist, as the root user, create a system user and group to handle the system message bus activity: groupadd -g 18 messagebus && useradd -c "D-Bus Message Daemon User" -d /var/run/dbus \ -u 18 -g messagebus -s /bin/false messagebus Install D-Bus by running the following commands (you may wish to review the output from ./configure --help first and add any desired parameters to the configure command shown below): ./configure --prefix=/usr \ --sysconfdir=/etc \ --localstatedir=/var \ --disable-doxygen-docs \ --disable-xml-docs \ --disable-static \ --disable-systemd \ --without-systemdsystemunitdir \ --with-console-auth-dir=/run/console/ \ --docdir=/usr/share/doc/dbus-&dbus-version; && make ./configure --prefix=/usr \ --sysconfdir=/etc \ --localstatedir=/var \ --disable-doxygen-docs \ --disable-xml-docs \ --disable-static \ --with-console-auth-dir=/run/console/ \ --docdir=/usr/share/doc/dbus-&dbus-version; && make See below for test instructions. Installing the package will override all files installed by D-Bus in LFS. It is critical that nothing uses D-Bus libraries or programs during the installation. The best way to ensure that these libraries are not being used is to run the installation in rescue mode. To switch to rescue mode, run the following command as the root user (from a TTY): systemctl start rescue.target Now, as the root user: make install The shared library needs to be moved to /lib, and as a result the .so file in /usr/lib will need to be recreated. Run the following command as the root user: mv -v /usr/lib/libdbus-1.so.* /lib ln -sfv ../../lib/$(readlink /usr/lib/libdbus-1.so) /usr/lib/libdbus-1.so If you are using a DESTDIR install, dbus-daemon-launch-helper needs to be fixed afterwards. Issue, as root user: chown -v root:messagebus /usr/libexec/dbus-daemon-launch-helper && chmod -v 4750 /usr/libexec/dbus-daemon-launch-helper If you are still building your system in chroot or you did not start the daemon yet, but you want to compile some packages that require D-Bus, generate D-Bus UUID to avoid warnings when compiling some packages with the following command as the root user: dbus-uuidgen --ensure If not in chroot, at this point, you should reload the systemd daemon, and reenter multi-user mode with the following commands (as the root user): systemctl daemon-reload systemctl start multi-user.target The dbus tests cannot be run until after has been installed. They must be run as an unprivileged user from a local session with bus address. Tests fail through ssh. If you want to run only the unit tests, replace, below, --enable-tests by --enable-embedded-tests, otherwise, has to be installed, before. The tests require passing additional parameters to configure and exposing additional functionality in the binaries. These interfaces are not intended to be used in a production build of D-Bus. If you would like to run the tests, issue the following commands (for the tests, you don't need to build the docs): make distclean && ./configure --enable-tests \ --enable-asserts \ --disable-doxygen-docs \ --disable-xml-docs && make && make check The estimated disk space required reported above is obtained in a build using the switches disabling documents generation. This and the use of the make distclean command implies that the build directory size is smaller than the one for a full build with documents generated. There is one error, for unknown reasons. There has been a report that the tests may fail if running inside a Midnight Commander shell. You may get out-of-memory error messages when running the tests. These are normal and can be safely ignored. --disable-doxygen-docs: This switch disables doxygen documentation build and install, if you have doxygen installed. If doxygen is installed, and you wish to build them, remove this parameter. --disable-xml-docs: This switch disables html documentation build and install, if you have xmlto installed. If xmlto is installed, and you wish to build them, remove this parameter. --disable-systemd: This switch disables systemd support in D-Bus. --without-systemdsystemunitdir: This switch prevents installation of systemd unit files. --with-console-auth-dir=/run/console/: This parameter specifies location of the ConsoleKit auth dir. --enable-tests: Build extra parts of the code to support all tests. Configure will end with a NOTE warning about increased size of libraries and decreased security. --enable-embedded-tests: Build extra parts of the code to support only unit tests. Configure will end with a NOTE warning about increased size of libraries and decreased security. --enable-asserts: Enable debugging code to run assertions for statements normally assumed to be true. This prevents a warning that '--enable-tests' on its own is only useful for profiling and might not give true results for all tests, but adds its own NOTE that this should not be used in a production build. /etc/dbus-1/session.conf, /etc/dbus-1/system.conf and /etc/dbus-1/system.d/* /etc/dbus-1/session.conf /etc/dbus-1/system.conf /etc/dbus-1/system.d/* The configuration files listed above should probably not be modified. If changes are required, you should create /etc/dbus-1/session-local.conf and/or /etc/dbus-1/system-local.conf and make any desired changes to these files. If any packages install a D-Bus .service file outside of the standard /usr/share/dbus-1/services directory, that directory should be added to the local session configuration. For instance, /usr/local/share/dbus-1/services can be added by performing the following commands as the root user: cat > /etc/dbus-1/session-local.conf << "EOF" <!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN" "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd"> <busconfig> <!-- Search for .service files in /usr/local --> <servicedir>/usr/local/share/dbus-1/services</servicedir> </busconfig> EOF To automatically start dbus-daemon when the system is rebooted, install the /etc/rc.d/init.d/dbus bootscript from the package. dbus make install-dbus Note that this boot script only starts the system-wide D-Bus daemon. Each user requiring access to D-Bus services will also need to run a session daemon as well. There are many methods you can use to start a session daemon using the dbus-launch command. Review the dbus-launch man page for details about the available parameters and options. Here are some suggestions and examples: There are many methods you can use to start a session daemon using the dbus-launch command. Review the dbus-launch man page for details about the available parameters and options. Here are some suggestions and examples: Add dbus-launch to the line in the ~/.xinitrc file that starts your graphical desktop environment. If you use xdm or some other display manager that calls the ~/.xsession file, you can add dbus-launch to the line in your ~/.xsession file that starts your graphical desktop environment. The syntax would be similar to the example in the ~/.xinitrc file. The examples shown previously use dbus-launch to specify a program to be run. This has the benefit (when also using the --exit-with-session parameter) of stopping the session daemon when the specified program is stopped. You can also start the session daemon in your system or personal startup scripts by adding the following lines: # Start the D-Bus session daemon eval `dbus-launch` export DBUS_SESSION_BUS_ADDRESS This method will not stop the session daemon when you exit your shell, therefore you should add the following line to your ~/.bash_logout file: # Kill the D-Bus session daemon kill $DBUS_SESSION_BUS_PID A hint has been written that provides ways to start scripts using the KDM session manager of KDE. The concepts in this hint could possibly be used with other session managers as well. The hint is located at . Installed Programs Installed Library Installed Directories dbus-cleanup-sockets, dbus-daemon, dbus-launch, dbus-monitor, dbus-run-session, dbus-send, dbus-test-tool, dbus-update-activation-environment, and dbus-uuidgen libdbus-1.so /etc/dbus-1, /usr/{include,lib}/dbus-1.0, /usr/share/dbus-1, /usr/share/doc/dbus-&dbus-version;, and /var/{lib,run}/dbus Short Descriptions dbus-cleanup-sockets is used to clean up leftover sockets in a directory. dbus-cleanup-sockets dbus-daemon is the D-Bus message bus daemon. dbus-daemon dbus-launch is used to start dbus-daemon from a shell script. It would normally be called from a user's login scripts. dbus-launch dbus-monitor is used to monitor messages going through a D-Bus message bus. dbus-monitor dbus-run-session start a process as a new D-Bus session. dbus-run-session dbus-send is used to send a message to a D-Bus message bus. dbus-send dbus-test-tool is a D-Bus traffic generator and test tool; it is a multi-purpose tool for debugging and profiling D-Bus. dbus-test-tool dbus-update-activation-environment is used to update the environment used for D-Bus session services; it updates the list of environment variables used by dbus-daemon --session when it activates session services without using systemd. dbus-update-activation-environment dbus-uuidgen is used to generate a universally unique ID. dbus-uuidgen libdbus-1.so contains the API functions used by the D-Bus message daemon. D-Bus is first a library that provides one-to-one communication between any two applications; dbus-daemon is an application that uses this library to implement a message bus daemon. libdbus-1.so A list of the installed files, along with their short descriptions can be found at .