rajamesandClaude Opus 5.5
9e711563b4
Captain Bob, 2026-11-06: a terminal with QEMU amd64 for people to play with; "Mint Zuse for demo console" (#111); "Make the most recent of builds that's green the demo"; a Try-it XWiki page with the console embedded. demo/ -- see its README: mint-zuse.sh a Zuse of the demo's own, as a stick: blank pair, system=v3 genesis, a second boot to confirm, make zusestick. Never anyone's real Zuse build-iso.sh the amd64 ISO, packed as make qemu packs it make-snapshot.sh boot once to [zuse@Hera] ok>, save the machine start-session.sh one visitor: the saved machine resumed, ended on hang-up, close or time-out console.py joins the visitor's terminal only once the machine runs; keys typed while it loads are discarded qemu-args.sh the machine, shared by save and resume starshipos-demo.service, apache-demo.conf, xwiki-try-it.xwiki Every session is a copy: no network, read-only image, the Zuse stick's writes discarded, QEMU's seccomp sandbox, an unprivileged user, a fenced systemd unit, 30 minutes at most. Tested here, from the sources master accepted (run 153): the Zuse minted (logs/20261106-192626, -192739); the saved machine at POST 538/538 and [zuse@Hera] ok>; a session through ttyd's websocket ready in 0.2 s, 3 4 + . -> 7 ok, 7 SQUARE . -> 49 ok; QEMU gone at once on hang-up, close and time-out. Found and fixed on the way: a machine saved stopped resumes stopped; a prompt matched as a regex; QEMU left behind by a hang-up; keys lost while the machine loads. Not tested here: Apache, several sessions at once (#116). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GE3SDvQn5EoxdGufk84zz2
43 lines
2.2 KiB
Bash
Executable File
43 lines
2.2 KiB
Bash
Executable File
#!/bin/bash
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# start-session.sh -- one visitor's session: the saved demo machine, resumed at its prompt, its
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# serial console on this terminal; gone when the visitor leaves or the time is up (issue #112).
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# ttyd runs this once per browser connection (issue #114).
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#
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# demo/start-session.sh [state-dir] (default: /var/lib/starshipos-demo)
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#
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# Nothing a visitor does survives the session: the firmware variables are a copy, the identity
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# drive's writes are discarded, the image is read-only, and the guest has no network.
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set -euo pipefail
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here=$(cd "$(dirname "$0")" && pwd)
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. "$here/qemu-args.sh"
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dir=${1:-${DEMO_STATE:-/var/lib/starshipos-demo}}
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limit=${DEMO_SESSION_LIMIT:-1800} # seconds a session may last
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[ -f "$dir/state" ] || { echo "The demo is not set up yet: no saved machine in $dir." >&2; exit 1; }
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tmp=$(mktemp -d "${TMPDIR:-/tmp}/starshipos-session.XXXXXX")
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trap 'rm -rf "$tmp"' EXIT
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cp "$dir/vars.fd" "$tmp/vars.fd"
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demo_qemu_args "$dir" "$tmp/vars.fd"
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printf '\r\nStarshipOS -- starting a throwaway machine, yours for up to %d minutes. Nothing you do is kept.\r\n' $((limit / 60))
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printf 'Try: 3 4 + . : SQUARE DUP * ; 7 SQUARE .\r\n\r\n'
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# QEMU is a tracked child, not exec'd, so that whatever ends the session ends the machine: ttyd
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# hangs up (it signals this script only), the service stops, or the time runs out. Its console is
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# a private socket, joined to this terminal by console.py only once the machine runs: keys typed
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# while it loads would be lost half-way through a line.
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qemu-system-x86_64 "${QEMU_ARGS[@]}" \
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-chardev "socket,id=con,path=$tmp/con.sock,server=on,wait=off" -serial chardev:con \
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-qmp "unix:$tmp/qmp.sock,server=on,wait=off" -monitor none \
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-incoming "file:$dir/state" </dev/null &
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qemu=$!
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( sleep "$limit"; kill "$qemu" 2>/dev/null ) &
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timer=$!
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# The bridge is a tracked child too: bash runs a trap only once its foreground command returns,
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# so a hang-up would otherwise wait on the bridge. `wait` returns to the trap at once.
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python3 -I "$here/console.py" "$tmp/qmp.sock" "$tmp/con.sock" 0<&0 &
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bridge=$!
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trap 'kill "$bridge" "$qemu" "$timer" 2>/dev/null; rm -rf "$tmp"' EXIT
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trap 'exit 0' HUP TERM INT
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wait "$bridge" || true
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printf '\r\n\r\nThe session has ended. Reload the page for a new one.\r\n'
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