57db9a56bb
The original diff claimed all three sibling `ufw status | grep -q` sites were safe because none set pipefail. That is true of drill/wipe.sh and drill/doctor.sh (both `set -u`) and FALSE of host/teardown-host.sh, whose line 12 is `set -euo pipefail`. Its line 60 was the identical pipeline, so the same race could read a plainly-active UFW as inactive and skip the whole crumb-removal block — leaving stale boxnet/claudenet rules on a host the operator was told is clean. Its numbered-delete loop had the same early-exit reader as its condition, so it could also end while rules remained. Both now read captures, matching box-firewall.sh's fix. The changelog claim is corrected rather than deleted: this repo's changelog is the record of what was proven, and shipping a disproven safety claim about a live defect is worse than the defect, because it tells the next reader not to look. Pinned in both directions, with comment lines stripped before matching — the fix's own commentary quotes the racing shape to explain it, and a pin that cannot tell prose from code fails on the comment documenting why it exists. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
116 lines
5.2 KiB
Bash
Executable file
116 lines
5.2 KiB
Bash
Executable file
#!/usr/bin/env bash
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# Reverse everything host/setup-host.sh created — and everything its pre-0.4.0
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# ancestor created, so one teardown cleans a host of any generation: all boxes
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# (both tags), the boxnet/claudenet networks + ACLs, the box-net/claude-dev
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# profiles, and both generations of firewall units and nft tables.
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# Usage: ./host/teardown-host.sh [--purge-incus] [--yes]
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# --purge-incus also apt-purge Incus itself (skipped if non-box
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# instances still exist on this host)
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# --yes skip the confirmation (BOX_YES=1 does the same) — for
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# automation: CI's uninstall drill and 'box uninstall
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# --purge-host' run this unattended
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set -euo pipefail
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purge=false; yes=0
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for arg in "$@"; do
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case "$arg" in
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--purge-incus) purge=true ;;
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--yes|-y) yes=1 ;;
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*) echo "teardown-host: unknown option: $arg" >&2; exit 2 ;;
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esac
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done
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[ -n "${BOX_YES:-}" ] && yes=1
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echo "This removes ALL boxes (uncommitted work in them is lost), the"
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echo "boxnet/claudenet networks, ACLs, profiles, and the box firewall rules"
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echo "(both current and pre-0.4.0 names)."
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$purge && echo "Incus itself will also be uninstalled (--purge-incus)."
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if [ "$yes" -eq 1 ]; then
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echo "(confirmed non-interactively: --yes/BOX_YES)"
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else
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read -rp "Continue? [y/N] " a
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case "$a" in y|Y) ;; *) echo "aborted"; exit 1 ;; esac
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fi
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# Instances — both tag generations, one delete at a time (a multi-name
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# 'incus delete' aborts at the first missing name).
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for tag in "user.box=1" "user.claudebox=1"; do
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for i in $(incus list "$tag" -f csv -c n 2>/dev/null || true); do
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echo "deleting instance $i"
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incus delete -f "$i"
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done
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done
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incus profile delete box-net 2>/dev/null || true
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incus profile delete claude-dev 2>/dev/null || true # legacy, pre-0.4.0
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incus network delete boxnet 2>/dev/null || true
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incus network delete claudenet 2>/dev/null || true # legacy, pre-0.4.0
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incus network acl delete box-isolate 2>/dev/null || true
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incus network acl delete claude-isolate 2>/dev/null || true # legacy
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# Boot-persistence units — both generations
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sudo systemctl disable --now box-firewall.service 2>/dev/null || true
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sudo systemctl disable --now claudebox-firewall.service 2>/dev/null || true
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sudo rm -f /etc/systemd/system/box-firewall.service /usr/local/sbin/box-firewall \
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/etc/systemd/system/claudebox-firewall.service /usr/local/sbin/claudebox-firewall
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sudo systemctl daemon-reload
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# Firewall crumbs — UFW rules mentioning either network (numbers shift after
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# each delete, so re-scan and remove the first match until none remain)
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# Every ufw read is CAPTURED before it is matched, never piped into a reader
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# that can exit early — the same discipline box-firewall.sh now uses, and for
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# the same measured reason (#102). This file sets `pipefail` (line 12), so
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# `ufw status | grep -q "Status: active"` returns the WRITER's exit: grep
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# matches on the first line ufw prints, closes the pipe, ufw takes SIGPIPE,
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# and the pipeline yields 141. A plainly-active UFW then reads as inactive
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# and this entire block silently skips, leaving stale boxnet/claudenet rules
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# on a host the operator was told is clean. It is a branch condition, so
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# errexit never fires — there is no error to see, which is exactly why it
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# went unnoticed here while the same shape was being measured next door.
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#
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# The numbered loop had the same defect for a different reason: its condition
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# was also an early-exit reader, so it could end while rules remained. It now
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# reads one capture per iteration and breaks on absence — the re-scan is still
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# per-delete (numbers shift after each removal), just no longer racing.
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ufw_status=""
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if command -v ufw >/dev/null; then
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# '|| true': ufw exits non-zero when it cannot read its config, and under
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# pipefail+errexit that would kill a teardown instead of correctly deciding
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# "no usable ufw here, nothing to clean".
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ufw_status="$(sudo ufw status 2>/dev/null || true)"
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fi
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if [[ "$ufw_status" == *"Status: active"* ]]; then
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for net in boxnet claudenet; do
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while :; do
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numbered="$(sudo ufw status numbered 2>/dev/null || true)"
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line="$(printf '%s\n' "$numbered" | grep -m1 "on $net" || true)"
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[ -n "$line" ] || break
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n="$(printf '%s\n' "$line" | sed -E 's/^\[ *([0-9]+)\].*/\1/')"
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[ -n "$n" ] || break
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sudo ufw --force delete "$n"
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done
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done
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fi
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sudo nft delete table inet box 2>/dev/null || true
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sudo nft delete table bridge box 2>/dev/null || true
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sudo nft delete table inet claudebox 2>/dev/null || true # legacy
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sudo nft delete table bridge claudebox 2>/dev/null || true # legacy
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if command -v docker >/dev/null; then
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for net in boxnet claudenet; do
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sudo iptables -D DOCKER-USER -i "$net" -j ACCEPT 2>/dev/null || true
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sudo iptables -D DOCKER-USER -o "$net" -j ACCEPT 2>/dev/null || true
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done
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fi
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if $purge; then
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remaining="$(incus list -f csv 2>/dev/null | wc -l)"
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if [ "$remaining" -gt 0 ]; then
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echo "NOTE: $remaining non-box instance(s) remain on this host — leaving Incus installed."
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else
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sudo apt-get purge -y incus
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sudo apt-get autoremove -y
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fi
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fi
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echo "Teardown complete. (The box install tree itself remains — 'box uninstall' removes it, with a zero-residue check.)"
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