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