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- plymouth - graphical boot animation and logger
-
- Plymouth is an application that runs very early in the boot process
- (even before the root filesystem is mounted!) that provides a graphical
- boot animation while the boot process happens in the background.
-
- It is designed to work on systems with DRM modesetting drivers. The
- idea is that early on in the boot process the native mode for the
- computer is set, plymouth uses that mode, and that mode stays throughout
- the entire boot process up to and after X starts. Ideally, the goal is
- to get rid of all flicker during startup.
-
- For systems that don't have DRM mode settings drivers, plymouth falls
- back to text mode.
-
- In either text or graphics mode, the boot messages are completely
- occluded. After the root file system is mounted read-write, the
- messages are dumped to /var/log/boot.log. Also, the user can see the
- messages at any time during boot up by hitting the escape key.
-
- Plymouth isn't really designed to be built from source by end users.
- For it to work correctly, it needs integration with the distribution.
- Because it starts so early, it needs to be packed into the
- distribution's initial ram disk, and the distribution needs to poke
- plymouth to tell it how boot is progressing.
-
- plymouth ships with two binaries: /sbin/plymouthd and /bin/plymouth
-
- The first one, plymouthd, does all the heavy lifting. It logs the
- session and shows the splash screen. The second one, /bin/plymouth, is
- the control interface to plymouthd.
-
- It supports things like plymouth --show-splash, or plymouth
- --ask-for-password, which trigger the associated action in plymouthd.
-
- plymouth supports various "splash" plugins which are analagous to
- screensavers, but happen at boot time. Currently there are three
- graphical splash plugins: solar, fade-in, and spinfinity. There are
- also three non-graphical plugins which are for text mode and the
- detailed view.
-
- The graphical plugins need a logo image and background color to
- function. Distributions are expected to set these up in their packages
- at ./configure time, but there are some placeholder values set up if
- ./configure doesn't get those options.
-
- Plymouth isn't done yet. It's still under active development and isn't
- ready for distros to use as-is. That should change in the near future
- though.
-