* When a PROCESS service process dies, and smooth_recovery is false, probably need to force-stop dependents even if the process itself was stopped deliberately. * Complete control socket handling and protocol - support for pinned-start and pinned-stop - support for listing all services * Implement a control utility to start/stop services after dinit has started - very basic version exists, needs thorough cleanup * Clean up tree a little, move source files into "src" For version 1.0: ---------------- * Log messages need to be duplicated to file (or to a logging process) once the file system comes up read/write. * Log messages are completely prevented from going to the console if the console is being held by a service, meaning some can get lost. It would be better if there was a (limited) buffer. * Perhaps need a way to prevent script services from re-starting. (eg there's no need to mount filesystems twice; there might be various other system initialisations that can't or shouldn't really be "undone" and so do not need to be re-done). * Documentation including sample service definitions * Better error handling, logging of errors (largely done, still some patches of code where it may be missing). * Write wtmp entry on startup (see simpleinit) * Allow running services as a different UID * On linux when running with PID != 1, write PID to /proc/sys/kernel/cad_pid so that we still receive SIGINT from ctrl+alt+del (must be done after /proc is mounted, possibly could be left to a service script) For later: * Internationalisation * A service can prevent shutdown/reboot by failing to stop. Maybe make multiple CTRL-ALT-DEL presses (or ^C since that's more portable) commence immediate shutdown (or launch a simple control interface). * Interruptible scripted services - where it's ok to terminate the start script with a signal (and return the service to the STOPPED state). So a long- running filesystem check, for instance, need not hold up shutdown. * When we take down a service or tty session, it would be ideal if we could kill the whole process tree, not just the leader process. * Investigate using cn_proc netlink connector (cn_proc.h) to receive process termination events even when running with PID != 1 (Linux only). Also, there is the possibility of having a small, simple PID-1 init which sends terminated process IDs over a pipe to Dinit. Finally, it may be possible to run dinit (and subprocesses) in a new PID namespace (again linux-only). * Allow logging tasks to memory (growing or circular buffer) and later switching to disk logging (allows for filesystem mounted readonly on boot) * Rate control on process respawn * Allow running services with different resource limits, chroot, cgroups, namespaces (pid/fs/uid), etc * Make default control socket location build-time configurable * Allow specifying a timeout for killing services; if they don't die within the timeout (after a TERM) then hit them with a KILL. Even later / Maybe never: * Support recognising /etc/init.d services automatically (as script services, with no dependency management - or upstart compatible dependency management) Also BSD's rc.d style scripts (PROVIDE, REQUIRE). * Place some reasonable, soft limit on the number of services to be started simultaneously, to prevent thrashing. Services that are taking a long time to start don't count to the limit. Maybe use CPU/IO usage as a controlling factor. * Cron-like tasks (if started, they run a sub-task periodically. Stopping the task will wait until the sub-task is complete). * Socket activation of services? Not sure if enough non-SystemD derived daemons actually support this to warrant implementing it. * Allow to run services attached to virtual tty, allow connection to that tty (ala "screen"). * SystemD-like handling of filesystem mounts (see autofs documentation in kernel) i.e. a mount point gets an autofs attached, and lazily gets mounted when accessed (or is mounted in parallel). Probably put the functionality in a separate daemon. Documentation: * Design philosophy/rationale document * Coding style guidelines * What's the best TERM setting? gogetty gives me "linux" but I think other variants may be better (eg "linux-c"). * Figure out the ConsoleKit/logind / PolicyKit mess & how dinit needs to fit into it. * Consolekit/logind tracks "sessions". Provides a mechanism to mark a session starting, associates processes with sessions, provides calls to terminate sessions etc (why?!!) Can use environment variable or cgroups to track processes in a session. A PAM module exists to create/destroy sessions. * Consolekit/logind also allows for requesting shutdown, reboot, and inhibiting reboot (via dbus API). * "seats" are a set of input/output hardware (mouse/keyboard/monitor) on which a session can be run. You can have multiple sessions on a seat - one is in the foreground (eg linux virtual ttys implement multiple sessions on a single seat). Sessions can run without a seat (eg ssh session).