commit 54859c9016b40e4fe93bc161588ab72d923ae3a2
parent adef641816607a857d793ab14403ae79404a7dc9
Author: Friedel Schon <[email protected]>
Date: Sun, 30 Apr 2023 00:13:02 +0200
adding readme
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+# FISS (Friedel's Initialization and Service Supervision)
+
+> 0.1.0 (May 2023)
+
+FISS is a lightweight and easy-to-use tool for initializing and supervising long-running services on Unix-like systems. It provides a simple and reliable way to start, stop, and monitor services, and it supports automatic restarts, logging, and customizable startup options.
+
+FISS is inspired by tools like [runit](http://smarden.org/runit/) and [daemontools](http://cr.yp.to/daemontools.html), but it aims to be simpler and more flexible, while still providing a similar level of reliability and security.
+
+## Features
+
+FISS provides the following features:
+
+- Automatic restarts: If a service exits unexpectedly, FISS will automatically restart it, up to a configurable number of times.
+- Logging: FISS captures the stdout and stderr of the service and writes them to log files, which can be rotated and compressed.
+- Customizable startup options: FISS allows you to specify environment variables, working directory, umask, and other options for the service.
+- Supervision: FISS monitors the service and ensures that it stays running, or else it terminates the service and retries later.
+- Status monitoring: FISS provides a simple command-line interface to check the status of a service, including its uptime, PID, and exit code.
+- Simple configuration: FISS uses a simple directory structure to store the configuration for each service, making it easy to manage and version control.
+
+## Dependencies
+
+- a POSIX shell compliment like `dash` or `bash`
+- `awk`
+
+## Installation
+
+FISS is written in C and POSIX Shell. To compile this project following tools are required:
+
+- `gcc` (or a gcc-compatible compiler like `clang`)
+- `make`
+- [`md2man-*`](https://github.com/sunaku/md2man) to make the manuals
+
+To compile the project simply run:
+
+```sh
+$ make # to compile everything
+$ make binary # to compile just the executables
+$ make manual # to compile the manuals
+```
+
+Then copy the contents of `bin/` to `/sbin/`, `usr/*` to `/usr/` and `etc/` to `/etc/`, the manuals are in `man`, copy them to `/usr/share/man/man8`.
+
+## Usage
+
+To use FISS, you need to create a configuration directory for each service you want to supervise.
+
+A service directory must contain either of those files: `run`, `start`, `depends`
+
+```
+/etc/service.d/my-service/
+├── log/
+├── nolog
+├── log
+├── depends
+├── env
+├── finish
+├── params
+├── pid
+├── run
+├── setup
+├── start
+├── stop
+├── user
+├── <runlevel>-once
+└── <runlevel>-up
+```
+
+### `run`
+
+The `run` file should be marked as executable and is ment be a long-running service, this can be a symbolic link to an executable or a simple script with executes.
+
+It must not coexist with `start`.
+
+```sh
+#!/bin/sh
+
+USER=hello
+PASSWORD=world
+
+exec python3 my-service.py $USER $PASSWORD
+```
+
+### `start`
+
+This file initiates a long-running background-service, this can be a symbolic link to an executable or a simple script.
+
+It must not coexist with `run`.
+
+If `start` exist, either `stop` or `pid` must exist to let fiss terminate a service, the function of those files is described beneath. `pid` is stat and read after `start` exits.
+
+If your service provides an foreground-running interface, it's advised to use this in combination with `run` as it's easier to supervise a foreground-process!
+
+```sh
+#!/bin/sh
+
+myservice --daemon > ./pid # myservice prints it's PID to stdout
+```
+
+### `stop`
+
+This file is ment to stop a background-service, this file will be executed whenever a service should terminate a background service.
+
+It may not coexist with pid.
+
+```sh
+#!/bin/sh
+
+myservice --stop
+```
+
+### `pid`
+
+This file contains the pid of a background service in decimal.
+
+### `depends`
+
+This file contains a newline-terminated list of services that should be running before this service is started. A service can only contain this file, it will be considered a meta-service.
+
+```
+dbus
+NetworkManager
+```
+
+### `nolog`
+
+By default FISS logs all services without a `log` file or directory inside _/var/log/fiss/\<service>.log_. If this file is present, this services will not be logged.
+
+This is useful for very verbose daemons, which would cause gigabytes of log-files.
+
+### `log/` directory
+
+If `log` is a directory, it should contain a service, the output or the service (if running as a foreground-service) will be redirected to the `run` of your log-service.
+
+The log-service is a dependency of your service, if the service or the log-service unexpectedly terminates, no data will be lost as data is buffered.
+
+### `log` file
+
+Output of the service is redirected to this file if existing, this can be used for simple services with no time-specific output as nothing but the output is redirected.
+
+If formatting or time-prefixed are wished, consider using a log-service.
+
+### `user`
+
+If existing, `start` of `run` will be executed as this user (and optionally a group). The contents should be in format `<user>[:<group>:<group...>]` or `<uid>:<gid>[:<gid...>]`
+
+```
+fiss-user:fiss-user
+```
+
+### `env`
+
+If existing, environment-variables will be passed to `run` or `start`, this is a simple `key=value`-file with **no variable-substitution**.
+
+```
+HOME=/home/fiss-user/
+THREADS=16
+BE_COOL=yes
+```
+
+### `params`
+
+If existing, arguments are passed to `run` or `start`. Every line is considered an argument and **no variable-substitution** is applied.
+
+If the first line starts with a `%` (percent sign), the 0th argument is set, otherwise this list begins with the first argument and `argv[0]` stays `'./run'`
+
+```
+%mysql
+-u
+cool user
+-p
+-d
+```
+
+which is equivalent to the shell-call:
+
+```
+mysql -u 'cool user' -p -d
+```
+
+### `setup`
+
+This file is executed before `start` or `run` is called with an unchanged environment (thus `root`). This file is useful for e.g. creating files which is not permitted by the user specified in `user`.
+
+```sh
+#!/bin/sh
+
+mkdir /run/myservice/
+chmod a+rw /run/service
+```
+
+### `finish`
+
+This file is executed after `run` or `stop` with an unchanged environment (thus `root`). This file is useful for e.g. cleaning up files which is not permitted by the user specified in `user`.
+
+```sh
+#!/bin/sh
+
+rmdir /run/myservice/
+```
+
+### `<runlevel>-up` and `<runlevel>-once`
+
+If this file is present, this service is started if `finit` is running with specified `runlevel`. If `-up` is present, this service will be restarted whenever it terminated. If `-once` is present, it will be started once and not restarted on exitting.
+
+Both `<runlevel>-up` and `<runlevel>-once` must not coexist.
+
+## Controlling
+
+To controll fiss (e.g. `finit` and `fsvs`) you use `fsvc` (friedel's service controller).
+
+For further information check out [the manual](man/fsvc.8.md).
+
+## Licensing
+
+This project is licensed under the terms of the [zlib license](./LICENSE).
