# /.bashrc — brintOS fbcon console shell rc for the GLIBC bash-init machine
# (HWJS-C-1 glibc console-shell wiring, 2026-07-03; setsid job-control fix
# 2026-07-14, issue linux-in-the-browser#91).
#
# WHY: the framebuffer console (fbcon on /dev/tty1, rendered to the browser
# canvas) only accepts typed text if SOMETHING is reading /dev/tty1. Pid 1 is
# `/init -i` (interactive glibc bash, HOME=/ from the host initEnvp), so bash
# reads THIS file at startup. It spawns ONE additional interactive bash with
# stdio on /dev/tty1, in its OWN session with tty1 as the CONTROLLING
# terminal — the same bash-native wiring as the musl-bash machine
# (distros/linux-6.12-musl-bash-coreutils/tools/fbcon-bashrc): /bin/setsid
# (first-party packages/custom/setsid, a STATIC musl-linked wasm binary
# staged via this rig's DISTRO_PACKAGES manifest — its libc is baked in, so
# it runs on this glibc machine unchanged, same as fbtest/ping) forks off
# pid 1's session, setsid(2)s, and -c acquires stdin (tty1) via TIOCSCTTY
# before exec'ing bash.
#
# This is what gives the canvas shell real job control: bash's tcsetpgrp
# succeeds and canvas Ctrl-C (VT ISIG -> fg pgrp of tty1's session) has a
# target. HISTORY: until 2026-07-14 the spawn line was a bare
# `bash -i 0<>/dev/tty1 ... &` — the tty1 shell stayed in pid 1's session,
# tty1 never became its controlling terminal, and glibc bash printed
#   "bash: cannot set terminal process group (1): Inappropriate ioctl for device"
#   "bash: no job control in this shell"
# at every fbcon startup (job control off; typing/echo/commands still
# worked). That was the documented carry-over from the musl-bash machine's
# pre-setsid wiring; the musl machines were fixed by packages/custom/setsid
# (issue #28) and this rc mirrors that fix (issue #91).
#
# This staging previously did NOT exist on the glibc machine — DELIBERATE at
# the time: the image booted with the `wasm_user_pin` cmdline fallback (glibc
# could not decode the -517 coro-park), under which a second idle console
# shell would PIN a second pool Worker and wedge fork() at the machine's
# cpu=2 spec. That gap is CLOSED: the glibc overlay now routes the blocking
# syscall paths through __wasm32_syscall_resched (the -517 park-restart —
# sysdeps/unix/sysv/linux/wasm32/Makefile, HWJS-C-1), the machine runs the
# cooperative park default, and an idle tty1 shell parks its coroutine
# instead of pinning a Worker.
#
# RESIDUAL (documented 2026-07-14, NOT fixed here — glibc-side, cpu=1 only):
# with job control now ACTIVE, a FOREGROUND fork+exec from this tty1 shell
# (e.g. typing `ls /` on the canvas) fails at cpu=1 — the forked bash child
# exits 1 BEFORE exec, silently (dmesg: "HWJS-A-4 EXIT with PRESERVED parked
# syscall"), flipping the hardwarejs glibc-dualcon-gate cpu=1 acid arm's F1
# step. The cpu=2 live-machine spec is unaffected (all dualcon cpu=2 steps
# pass), background jobs + fg work at BOTH cpu counts (this rig's
# run-fbcon-jobcontrol-gate.mjs is GREEN at MAXCPU=1 and 2), and the MUSL
# image with the IDENTICAL setsid wiring passes the same cpu=1 foreground
# fork — so this is a glibc-specific interaction between the job-control
# child path (setpgid/tcsetpgrp before exec, kernel semantics per
# brintos/linux#7) and the glibc INLINE_SYSCALL -517 decode gap on syscalls
# OUTSIDE the HWJS-C-1-routed blocking read/write/wait paths (AGENTS.md
# "Established substrate facts"). Owned by the glibc overlay / linux#7 work,
# not by this composition.
#
# Guards: fire exactly once, in pid 1 only, only when the kernel actually has
# a /dev/tty1 (a display-less boot skips silently — the rc is inert).
if [ -z "${BRINTOS_FBCON_STARTED-}" ] && [ "$$" = 1 ] && [ -c /dev/tty1 ]; then
	export BRINTOS_FBCON_STARTED=1
	TERM=linux PS1='fb$ ' setsid -c bash -i 0<>/dev/tty1 1>&0 2>&0 &
fi

# One-shot network bring-up — the EXACT musl-bash machine block (that rig's
# fbcon-bashrc, issue #51 / HWJS-C-2.b shape); this image was MISSING it
# entirely (witnessed 2026-07-15, #94 fallout: `ping 1.1.1.1` -> "sendto:
# Network unreachable" — no route ever existed here; #90 staged only the ping
# BINARY). Pid 1 is interactive bash reading THIS rc, so the static config
# the busybox machine runs from its rcS lives here, same pid-1-once guard as
# the fbcon block above. Loopback is NOT configured here (issue #76): the
# wasm32 kernel brings lo up itself. eth0 is guarded on the interface
# existing so a display-less/net-less boot degrades loudly, not with an `ip`
# error cascade. `ip` is the REAL iproute2 staged in /bin.
if [ -z "${BRINTOS_NET_STARTED-}" ] && [ "$$" = 1 ]; then
	export BRINTOS_NET_STARTED=1
	if ip link show eth0 > /dev/null 2>&1; then
		# ONLY CONFIGURE WHAT NOBODY CONFIGURED ALREADY. This rc is not
		# always the first thing to touch eth0: on a guestroot boot the
		# initramfs /init (packages/custom/guestroot-init) has already
		# brought eth0 up with 10.0.2.15/24 and a default route via the
		# gateway from the kernel cmdline, before it execs the distro
		# init that reads this file. The unconditional `add`s below then
		# returned EEXIST and printed
		#
		#     RTNETLINK answers: File exists
		#     RTNETLINK answers: File exists
		#
		# on EVERY boot of such an image, one per add — a machine that is
		# perfectly configured greeting the user with two errors.
		#
		# The test is for ANY address / ANY default route, deliberately
		# NOT for these specific values: whoever configured first wins.
		# guestroot-init takes its gateway from `prestrike.gw=`, so a
		# machine may legitimately be on a different one, and `ip route
		# replace default via 10.0.2.2` — the obvious one-line fix —
		# would silently CLOBBER that machine's real gateway. Likewise a
		# static image that already has an address must not gain a
		# second one.
		#
		# `add` is kept rather than `replace` so a genuine failure (no
		# permission, device vanished mid-boot) is still LOUD; what is
		# removed is only the case where there was nothing to do.
		ip link set eth0 up
		[ -n "$(ip -o -4 addr show dev eth0)" ] \
			|| ip addr add 10.0.2.15/24 dev eth0
		[ -n "$(ip -o -4 route show default)" ] \
			|| ip route add default via 10.0.2.2
	else
		echo "brintos bashrc: no eth0 (virtio-net absent) — network not configured"
	fi
fi