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init: data-driven boot service list via /etc/init.csv

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Replace init's hardcoded boot_services array with an authoritative,
human-readable service list read at boot, mirroring /etc/devices.csv. Each row
is a service binary path followed by its argv; startup order is file order,
shutdown the reverse. There is no hardcoded fallback — a missing file starts
nothing (the no-ramdisk isolation behavior).

- library/csv: shared CSV helpers (comment strip, field iteration) with unit
  tests; device-registry is refactored onto them so both /etc/*.csv files parse
  through one place.
- init reads /etc/init.csv into fixed-max static tables (the same pattern as the
  device registry) and passes each row's argv straight to spawnSupervised. This
  also makes boot-time modes (e.g. device-manager test-usb-restart) expressible
  as data rather than hardcoded.
- Diagnose mode (-Ddiagnose omits the display stack) becomes build-time file
  selection between etc/init.csv and etc/init-diagnose.csv, so init carries no
  comptime service logic; the diagnose build option is dropped from init.
- build.zig: csv module wired; /etc/init.csv bundled into the initrd; the
  device-registry tests move to a dedicated block since they now import csv.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KJqSiLLchDUUCoXn5jsiwd
This commit is contained in:
daniel
2026-07-26 17:13:51 +01:00
co-authored by Claude Opus 4.8
parent 203528c8a7
commit 081ba1d74e
6 changed files with 235 additions and 77 deletions
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etc/init.csv
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# /etc/init.csv — the services init (PID 1) starts at boot, in order.
#
# init reads this at startup and spawns each service supervised (restarting it on
# a crash, up to a cap). Startup order is top->bottom; shutdown is the reverse, so
# the logger (last) goes down first and its final drain still has the fat server
# and the whole storage chain alive underneath it. It is AUTHORITATIVE — there is
# no hardcoded fallback list; a missing file means no services are started.
#
# '#' starts a comment (whole-line or trailing); blank lines are ignored. The
# first field is the service binary path; any fields after it are the service's
# argv. Drivers are absent on purpose — the device manager discovers hardware and
# spawns those (see /etc/devices.csv).
#
# service args...
/system/services/input
/system/services/device-manager
/system/services/fat
/system/services/display
/system/services/display-demo
/system/services/logger
1 # /etc/init.csv — the services init (PID 1) starts at boot, in order.
2 #
3 # init reads this at startup and spawns each service supervised (restarting it on
4 # a crash, up to a cap). Startup order is top->bottom; shutdown is the reverse, so
5 # the logger (last) goes down first and its final drain still has the fat server
6 # and the whole storage chain alive underneath it. It is AUTHORITATIVE — there is
7 # no hardcoded fallback list; a missing file means no services are started.
8 #
9 # '#' starts a comment (whole-line or trailing); blank lines are ignored. The
10 # first field is the service binary path; any fields after it are the service's
11 # argv. Drivers are absent on purpose — the device manager discovers hardware and
12 # spawns those (see /etc/devices.csv).
13 #
14 # service args...
15 /system/services/input
16 /system/services/device-manager
17 /system/services/fat
18 /system/services/display
19 /system/services/display-demo
20 /system/services/logger