avoidthislinux/situation: god's greatest init - Codeberg.org

|\▒▓
\o▒▓ situation: god's greatest init
o|▒▓
About
 situation you're seeng here is fork of derivelinux/situation. 
 Core functionality, like supervisor, socket IPC, service management, 
 dependency resolution were rewritten in C. Shell stays shell: 
 rc.derive and rc.finir are plain scripts the user owns entirely.
Build and install
 make
 make install DESTDIR=/
 Add init=/bin/situation to the kernel cmdline.
 Static binary, no runtime deps beyond a libc.
Boot sequence
 situation mounts virtual filesystems, sets the hostname and a handful of
 kernel parameters, then hands off to /etc/rc.derive. That script is
 responsible for everything site-specific: device manager, firmware,
 networking, getty. After rc.derive exits, the supervisor starts and
 launches enabled services.
 On shutdown (SIGTERM/SIGINT/SIGUSR1), /etc/rc.finir runs first, then
 services are stopped gracefully (5s SIGTERM window, then SIGKILL), and
 the system halts via reboot(2).
Services
 Service definitions live in /etc/sv/. Each file is a key=value text file:
 type=longrun # longrun (default) or oneshot
 needs=postgres,redis # comma-separated, optional
 start=nginx -g 'daemon off;'
 stop=nginx -s quit # optional; default is SIGTERM
 A service is enabled by placing a symlink to it in /etc/sv/on/. The
 supervisor resolves the dependency graph (Kahn topological sort) and
 starts services in order. If a dependency dies, its dependents are
 stopped and restarted alongside it. Failed services are restarted with
 exponential backoff (1s → 30s max), resetting after 10s of stable uptime.
 Readiness can be signalled by touching /run/sv/ready/<name>.
sctl
 see it for yourself, run sctl from console
Paths
 /etc/sv/ service definitions
 /etc/sv/on/ symlinks to enabled services
 /etc/rc.derive boot script
 /etc/rc.finir shutdown script
 /run/sv/situation.sock IPC socket
 /run/sv/ready/<name> readiness marker