Claude
171b3947dd
Captain Bob, 2026-11-07: 'Limit guests and have a Busy, try back in a few minutes.' start-session.sh takes one of DEMO_MAX_GUESTS slots (default 2), a lock it holds for the session's life (flock -n: two visitors cannot both take the last one; QEMU and the bridge are started without its descriptor); with every slot taken, the visitor's terminal says every machine is busy and to try back in a few minutes, and the session ends without a machine. The service: DEMO_MAX_GUESTS=2, RuntimeDirectory for the locks, ttyd's --max-clients 6 so a visitor over the limit reaches the message. The guest: 384 MiB (v4 boots from 256 MiB, refuses at 128; measured, #116). Tested here: every slot held -> the busy message; slot 1 held -> slot 2 taken. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GE3SDvQn5EoxdGufk84zz2
40 lines
1.9 KiB
Bash
40 lines
1.9 KiB
Bash
# qemu-args.sh -- the demo machine, sourced by make-snapshot.sh and start-session.sh.
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#
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# A session resumes a machine saved by make-snapshot.sh, and QEMU can resume a saved machine only
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# into the same machine: the same board, CPU, memory, firmware and devices. Both scripts build the
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# command line here, so they cannot drift apart. It is the machine `make -f kernel/Makefile
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# ARCH=amd64 qemu` boots (q35, TCG, OVMF, the ISO as a CD) -- in 384 MiB, not its 1 GiB: v4 boots
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# to Zuse's prompt from 256 MiB, refuses at 128 ("no memory for the block chain"), measured
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# 2026-11-07 (#116) -- less what a visitor must not have: no network device, no Artemis disk, no
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# display, and QEMU's seccomp sandbox on.
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#
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# demo_qemu_args <state-dir> <vars.fd> -> fills the array QEMU_ARGS
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#
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# <state-dir>/StarshipOS.iso is the image; <state-dir>/identity.img, if there, is the identity
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# drive every session gets (issue #111), attached with its writes discarded.
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OVMF_CODE=${OVMF_CODE:-/usr/share/OVMF/OVMF_CODE_4M.fd}
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demo_qemu_args() {
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local dir=$1 vars=$2
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QEMU_ARGS=(
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-machine q35,accel=tcg
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-cpu qemu64,+rdrand
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-m 384 # v4 boots from 256 MiB; 384 leaves room (#116)
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-smp 1
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-drive "if=pflash,format=raw,readonly=on,file=$OVMF_CODE"
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-drive "if=pflash,format=raw,file=$vars"
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-drive "if=none,id=cd,media=cdrom,readonly=on,file=$dir/StarshipOS.iso"
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-device ide-cd,drive=cd,bootindex=0
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-device qemu-xhci,id=xhci0,p2=16,p3=16 # kernel/Makefile XHCI_PORTS
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-nic none
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-display none
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-no-reboot
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-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny
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)
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if [ -f "$dir/identity.img" ]; then
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QEMU_ARGS+=(-drive "if=none,id=ident,format=raw,snapshot=on,file=$dir/identity.img"
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-device usb-storage,bus=xhci0.0,port=1,drive=ident)
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fi
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}
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