Joachim Wiberg
a814e85356
dbus.md was orphaned: not in dist_docs_DATA, not linked from the user guide. Wire it into the doc dist and link it from the index features list, features.md, initctl.md, and plugins.md, where the dbus.so plugin entry now disambiguates the external system bus from the built-in org.finit API. Document the 64-peer cap, the supported AddMatch keys, the busconfig policy file, the legacy-parity edge semantics with the deliberate SetRunlevel InvalidArgs divergence, the reload-signal behavior of Service1.Reload, and the reboot family timeout. Refresh the stale initctl.md usage paste, add monitor and the D-Bus transport to initctl(8), add /run/finit/bus to the filesystem layout, and flatten the ChangeLog D-Bus entry to house style. Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
4.2 KiB
Introduction
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Reverse engineered from the EeePC fastinit
"gaps filled with frog DNA …"
— Claudio Matsuoka
Finit is a process starter and supervisor designed to run as PID 1 on Linux systems. It consists of a set of plugins and can be set up using configuration files. Plugins start at hook points and can run various set up tasks and/or install event handlers that later provide runtime services, e.g., PID file monitoring, or conditions.
Features
- Runlevels, defined per service
- One-shot tasks, services (daemons), or SysV init start/stop scripts
- Runparts and
/etc/rc.localsupport - Process supervision similar to systemd
- Fine-grained privilege control:
- Linux capabilities for minimal required privileges
- Supplementary groups for multi-group resource access
- Sourcing environment files
- Conditions for network/process/custom dependencies
- Readiness notification; PID files (native) for synchronizing system startup, support for systemd sd_notify(), or s6 style too
- Limited support for tmpfiles.d(5) (no aging, attributes, or subvolumes)
- Pre/Post script actions
- Rudimentary templating support
- Tooling to enable/disable services
- D-Bus API,
org.finitcontrol and signals for bus clients - Automatic reload of modified configuration files (optional)
- Built-in getty
- Built-in watchdog, with support for hand-over to watchdogd
- Built-in support for Debian/BusyBox
/etc/network/interfaces - Cgroups v2, both configuration and monitoring in
initctl top - Plugin support for customization
- Proper rescue mode with bundled
suloginfor protected maintenance shell - Switch root support for initramfs-to-real-root transitions
- Integration with watchdogd for full system supervision
- Logging to kernel ring buffer before
syslogdhas started, see the recommended sysklogd project for complete logging integration and how to log to the kernel ring buffer from scripts usinglogger
For a more thorough overview, see the Features section.
Tip
See SysV Init Compatibility for help to quickly get going with an existing SysV or BusyBox init setup.
Origin
This project is based on the original finit by Claudio Matsuoka which was reverse engineered from syscalls of the EeePC fastinit.
Finit is developed and maintained by Joachim Wiberg at GitHub. Please file bug reports, clone it, or send pull requests for bug fixes and proposed extensions.