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107 lines
3.3 KiB
Markdown
107 lines
3.3 KiB
Markdown
TODO
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====
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Unsorted TODO list of features and points of investigation that could be
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useful for improving finit. But what is an improvement to finit? Well,
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similiar to launchd, the goal of finit is to be a FAST replacement for:
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* init
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* inetd
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* crond
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* watchdogd
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The main goal is to be FAST. Secondary goals are to be: small, simple
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and with a very low dependency on external packages.
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Inetd
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-----
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Simple way of running Internet services on demand, like the old inetd:
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inetd SVC [RUNLVL] /path/to/daemon args -- description
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Example:
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# Inetd services, launched on demand
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inetd ssh [2345] /usr/sbin/sshd -i -- SSH Daemon
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In keeping with the finit tradition, an optional callback can be setup
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to each inetd service. When a client connects the finit will call the
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callback with a `struct in_pktinfo` argument which the callback then can
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allowed or deny.
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Alternatively, borrowing from TCP wrappers by Wietse Wenema, a set of
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`allow` and `deny` directives can be added to `finit.conf` to control
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inetd services. It could be what IP addreses, networks or interfaces
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are allowed to connect to the given inetd services. To start with the
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easiest (and what we need for WeOS at Westermo) is allow/deny per iface.
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# Disable access to SSH
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deny ssh all
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# Allow SSH connections originating from eth0
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allow ssh eth0
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Priority
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--------
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The intent of finit is to monitor not just processes, but to supervise
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an entire system and the behavior of certain processes that declare
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themselves to be finit compliant.
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* Integrate libev, or libuev, to handle events: signals, I/O, etc.
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"Event driven software improves concurrency" -- Dave Zarzycki, Apple
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See the [launchd video](http://www.youtube.com/watch?v=cD_s6Fjdri8)
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for more info!
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* Add support for a `/dev/watchdog` plugin to replace `watchdogd`
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* Integrate watchdog plugin with process/system supervisor to optionally
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reboot the system when a process stops responding, or when a respawn
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limit has been reached, as well as when system load gets too high.
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Configuration
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-------------
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* Add support for `init <q | reload-configuration>` and `SIGHUP` to
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have finit reload its `finit.conf`, but also
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* Add support for inotify to automatically reload `finit.conf`
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Runlevels
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---------
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* Implement `initctl stop|start|restart|reload|status <SVC>` and
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`service <SVC> stop|start|restart|reload|status` on top
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* Add PRE and POST hooks for when switching between runlevels
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Miscellaneous
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-------------
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* Add support for `init -v,--version | version`
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* Cleanup move sources from top-level directory to `src/` and `include/`
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* Make sure to install `queue.h` to `$(PREFIX)/include/finit/queue.h`
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* Move `finit.conf` "check" command to plugin which checks `/etc/fstab`
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instead. This is the de-facto practice. But keep the check command
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for really low-end systems w/o `/etc/fstab`.
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Documentation
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-------------
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* Write man pages for finit and `finit.conf`, steal from the excellent
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`pimd` man pages ...
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* Update Debian `finit.conf` example with runlevels, `tty/console` and
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dependency handling for Debian 8 (the dreaded systemd release).
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Investigation
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-------------
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* [FHS changes](http://askubuntu.com/questions/57297/why-has-var-run-been-migrated-to-run)
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affecting runtime status, plugins, etc.
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