Joachim Wiberg
2e0b1d6f8b
Finit speaks D-Bus itself now and claims org.finit on the system bus when it finds one, but nothing in a default build ever brings that bus up. The plugin that does was opt-in, so the built-in support sat idle unless the integrator knew to ask for both halves. Defaulting it on is only reasonable if the result stays the admin's to change, and a service registered from C through conf_save_service() is not: it lands in the run path where it cannot be overridden or emptied out. So the daemon moves to 20-dbus.conf and its directories to tmpfiles.d/dbus.conf, the same way hotplug and every other daemon we ship them for. The plugin keeps only what has to look at the running system, the stale pidfile and the machine UUID. Those directories are no longer chowned to messagebus. tmpfiles.d skips a line whose user does not exist rather than falling back, so the plugin's messagebus/dbus/root ladder has no equivalent there, and dbus-daemon binds its socket before dropping privileges anyway. The plugin already bows out where there is no dbus-daemon installed, so systems that never wanted a bus are unaffected, and --disable-dbus-plugin is there for those that have one and would still rather init left it alone. Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
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
- 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.