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Deprecation warning: inetd removal, update TODO accordingly
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg
+7
-2
@@ -4,13 +4,18 @@ Change Log
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All relevant changes are documented in this file.
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[3.2][UNRELEASED] - 2020-04-xx
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[3.2][UNRELEASED] - 2021-03-xx
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------------------------------
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Bug fix release, but also cgroups and a new progress!
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Major bug fix release. New features include cgroups and a new progress!
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https://twitter.com/b0rk/status/1214341831049252870?s=20
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> **Note:** deprecation warning, this is likely the last release with
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> built-in inetd support! Current plan is to rip it out at
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> the start of the next release cycle. It *may* return as
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> a separate stand-alone daemon.
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### Changes
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* Introducing Finit progress 𝓜𝓸𝓭𝓮𝓻𝓷
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* Support for `sysv` start/stop scripts as well as monitoring forking
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+14
-63
@@ -1,36 +1,33 @@
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Goals of Finit
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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. Similar to launchd, the goal of
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finit is to be a replacement for:
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Initially Finit aimed to be more than a processes monitor, acting as a
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replacement for cron/at and inetd as well. Over time, however, the true
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value in the project turned out to be:
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* init
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* inetd
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* crond
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* watchdogd
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A small and simple replacement, primarily for embedded systems, with a
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low dependency on external packages. A compliant software is one that
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can run as a damon in the foreground. If it can also touch its PID file
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after a reconfiguration (`initctl reload`), the Finit dependency system
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can also be used.
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> A simple SysV init and systemd replacement, primarily for embedded
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> systems, container, and dedicated server applications.
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Near Future
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-----------
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* Remove native inetd support. Relocate to a stand-alone application,
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possibly even outside of the Finit project. Will greatly simplify
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the remaining bits ...
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* ... when inetd support has been removed, we can refactor the .conf
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parser, parse user input in a separate process, move process monitor
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to separate process (same as parser?), and possibly even ...
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* ... add new (complimentary) .svc file format to slowly migrate away
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from the very terse one-liner format currently used.
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* When a process dies, and Finit does not restart it, we should collect
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a `siginfo_t` from the SIGCHLD signal and supply to the user in case
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`initctl status <process>` is called to debug the issue.
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* Merge UDP redirect service uredir as an UDP inetd variant
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* Add `finit.conf` support for UPS notification (SIGPWR) to start a task
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using, e.g. <sys/power/{ok,fail,low}> conditions. More info in sig.c
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* Add `finit.conf` support for ctrl-alt-delete (SIGINT) and kbrequest,
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i.e. KeyboardSignal, (SIGWINCH) behavior. Using conditions to a task,
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e.g, <sys/key/ctrlaltdel> and <sys/key/signal> like SIGPWR handling.
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* Cron/At support, see below
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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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@@ -67,53 +64,7 @@ Init
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----
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Finit in itself is not SysV Init compatible, it doesn't use `/etc/rc.d`
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and `/etc/inet.d` scripts to boot the system. However, a plausible way
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and `/etc/init.d` scripts to boot the system. However, a plausible way
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to achieve compatibility would be to add a plugin to finit which reads
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`/etc/inittab` to be able to start standard Linux systems.
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Inetd
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-----
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* Add support for throttling connections.
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* Optimize interface filtering by using socket filter. The functions
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`inet_*_peek()` and `inetd_is_allowed()` used for interace filtering
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should be possible to rewrite as socket filters.
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* Optimize HTTP/HTTPS inetd connections by adding basic support for the
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`inetd` variant `redir http/tcp@eth0 nowait [2345] 127.0.0.1:8080`,
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which would reduce the overhead of spawn the web server on each HTTP
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connection, yet still provide a means of filtering access per iface.
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Crond
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-----
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Requirements are quite rudimentary, basic cron functionality, mainly
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system-level timed periodic tasks:
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* Periodically run a task, in a matching runlevel
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* Optionally run as non-root (`crontab -e` as operator)
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Proposed syntax:
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# Crontab
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cron @SPEC [LVLS] /path/to/cmd [ARGS] -- Optional descr
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# One-shot 'at' command
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at @YY-mm-ddTHH:MM [LVLS] /path/to/cmd [ARGS] -- Optional descr
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Notice the ISO date in the `at` notation. The `cron @SPEC` could use
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are mo loose notation, e.g. `@hourly`, `@midnight`, `@daily`, `@weekly`,
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`@reboot`, etc. The runlevels is extra filtering sugar. E.g., if cron
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service is only allowed in runlevels two or three it will not start if
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system currently is in runlevel four.
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To run a command as another user the `.conf` file must have a that
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owner. E.g., `/etc/finit.d/extra.conf` may be owned by operator and
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only hold `cron ...` lines.
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What would be extremely useful is if `initctl`, or a homegrown `at`,
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could support the basic functionality of the `at` command directly from
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the shell -- that way setting up one-time jobs would not entail
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re-reading `/etc/finit.conf`
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