Native: turning the web off has to take the listener down (#413) - #465
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`bin/agentbox`'s render is additive: `apply` deletes only what a render explicitly queues, so a section that stops emitting files leaves the previous apply's files — and its UNITS — in place. `caddy()` and `fail2ban()` were called under `if self.spec.web_enable:` with no else, and the webhook artifacts had no teardown at all. The per-user %i instances did stop (cmd_apply walks those prefixes). What survived were the PLAIN units nothing reconciles: `caddy.service` went on listening on 80/443, with the browser terminal's basic auth in front of an upstream that no longer existed, `agent-box-fail2ban.service` went on watching a log nobody wrote, and `agent-web-auth-secrets.service` went on projecting the terminal's secrets into /run. Same defect class as codexFullAccess (#394) and protectMemory (#404), with a public listener on the other end. `web_off()` and `webhook_off()` follow `memory_protection_off()`: queue the files, append the plain units to `t.disable`, and gate the disable on the unit still being ours so a box that never had the feature stays quiet and an administrator's own copy is left alone. Ordering is the reverse of startup — the jail (`PartOf=caddy.service`) first, the secrets caddy `Requires=` last — so nothing is briefly running without what it depends on. Two things had to be solved to make removal actually possible: **Ownership for files that cannot carry a header.** `remove_if_ours` proves ownership by the generated header. The %i template units are installed byte-for-byte from the profile and shared with the NixOS backend, where our header would be false; the `web-users` manifest is a TSV whose own reader would parse a header line as a user. Both now pass a `verbatim` witness — the exact text this box would have written — which is strictly NARROWER than the header check, not wider: an edited file no longer matches and is left alone, with the same message. There is a test for exactly that. **Headers where one belongs and was simply missing.** The per-user env files, the per-instance drop-ins, the three `/usr/local/bin` wrappers and the rendered Caddyfile carried no header (the wrappers carried a near-miss, "# Generated by `agentbox apply`." without the "— do not edit"), so none of them was ever removable. All four formats take `#` comments; they carry the real header now. That also makes the three wrappers removable for the first time, which they were not before this change either. Rather than enumerate what `caddy()` and `fail2ban()` write — a list that goes stale the moment someone adds a file and has no reason to look here — `would_have_written()` runs those same methods into a throwaway Tree and takes their `files`. It is guarded: a box that cannot reconstruct (a fragment that grew an unknown token) still gets its units stopped and says in a note what it could not remove. Deliberately NOT removed, and said so in the code: `/etc/agent-box/<user>.hash` and the cookie secrets under `/var/lib/agent-box-web`. This renderer neither mints nor can re-derive them, so turning the terminal off keeps the password for turning it back on; nothing reads them with caddy down. Likewise the fail2ban `action.d` symlink, which points into the profile and is inert once the jail is. ## Tests Three cases, all in the shape #404 established — two applies into ONE root, which is the only way to see this (separate roots cannot): - `test_turning_web_off_takes_the_public_listener_with_it`: 13 rendered paths gone, and the three plain units named for disable in dependency order. - `test_turning_webhooks_off_removes_the_cli_that_promises_them`. - `test_an_edited_web_file_survives_the_teardown`: the `verbatim` witness refuses an administrator's edit to both a header-less manifest and a template unit, and says "no longer ours to remove". Verified as real guards: each fails on master's renderer. ## Checks run (aarch64) `agentbox-render`, `backend-parity`, `one-spec-both-backends`, `module-generated-up-to-date`, `golden-snapshot` — pass. `nix build .#packages.aarch64-linux.runtime` (the flake8 gate over bin/agentbox) — pass. `python3 tests/test_agentbox.py` — 73 tests, OK. Native-only: no module change, no `modules/` or `tests/golden/` movement, no new unit, no new sudo grant, no AWS/Azure template change. Existing boxes pick it up at their next `agentbox update`. Closes #413. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PBDHCBttvBEHQJJH24MfxF
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Included review availability: Your plan provides up to 8 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe native renderer now reconciles disabled web and webhook features. It tracks ownership witnesses, removes stale generated artifacts, preserves edited files and credentials, adds ownership headers, and tests teardown behavior. ChangesNative feature cleanup
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to The change removes obsolete native web and webhook artifacts when those features are disabled while preserving administrator-edited files; no actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant Configuration
participant Renderer
participant Tree
participant NativeSystem
Configuration->>Renderer: disable web or webhook feature
Renderer->>Tree: reconstruct and register stale artifacts
Tree->>NativeSystem: disable owned units
Tree->>NativeSystem: remove verified generated files
NativeSystem-->>Renderer: preserve edited files and credentials
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✅ Passed checks (4 passed)
Full details: Linked Issues checkExplanation The changes satisfy issue Full details: Docstring CoverageExplanation Docstring coverage is 60.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 9 files. (13 skipped: 13 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@bin/agentbox`:
- Around line 673-675: Update cmd_apply’s live web-feature teardown and
instance-stop logic so units using retained administrator-owned templates are
not stopped. Before stopping agent-web-terminal@, agent-box-settings@, or
agent-box-webhook@ families, verify their templates still match the generated
header or profile witness, and skip families that do not.
- Around line 1127-1131: Update same_text to reject symbolic links before
reading the file, returning False when path identifies a symlink; retain the
existing content comparison for regular files and its current
OSError/UnicodeDecodeError handling.
In `@tests/test_agentbox.py`:
- Around line 1530-1531: Update the test around render(False) to create
representative agent.hash and cookie-secret files in the temporary root before
rendering, then assert that both credential files still exist afterward; remove
the unconditional “or True” from the existing assertion.
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- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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bin/agentboxtests/native/expected/etc/agent-box/Caddyfiletests/native/expected/etc/agent-box/units/agent-box-settings-agent.envtests/native/expected/etc/agent-box/units/agent-box-settings-robot.envtests/native/expected/etc/agent-box/units/agent-box-webhook-agent.envtests/native/expected/etc/agent-box/units/agent-box-webhook-robot.envtests/native/expected/etc/agent-box/units/agent-web-terminal-agent.envtests/native/expected/etc/agent-box/units/agent-web-terminal-robot.envtests/native/expected/etc/agent-box/units/agent.envtests/native/expected/etc/agent-box/units/robot.envtests/native/expected/etc/systemd/system/agent-box-settings@agent.service.d/10-host.conftests/native/expected/etc/systemd/system/agent-box-settings@robot.service.d/10-host.conftests/native/expected/etc/systemd/system/agent-box-webhook@agent.service.d/10-host.conftests/native/expected/etc/systemd/system/agent-box-webhook@robot.service.d/10-host.conftests/native/expected/etc/systemd/system/agent-box@agent.service.d/10-host.conftests/native/expected/etc/systemd/system/agent-box@robot.service.d/10-host.conftests/native/expected/etc/systemd/system/agent-web-terminal@agent.service.d/10-host.conftests/native/expected/etc/systemd/system/agent-web-terminal@robot.service.d/10-host.conftests/native/expected/usr/local/bin/agent-box-profiletests/native/expected/usr/local/bin/agent-box-sessiontests/native/expected/usr/local/bin/agent-box-webhooktests/test_agentbox.py
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…uld not fail CodeRabbit review on #465. Two real findings, both about the guard rather than the thing guarded — which is the failure mode this PR's own description quotes, so they are worth taking seriously rather than waving through. **`same_text` followed symlinks.** It gates `systemctl disable --now`, and it read through a link — so an administrator who replaced caddy.service with a symlink into their own config could have had a byte-identical target satisfy the witness and the unit stopped out from under them, while remove_if_ours, which refuses symlinks deliberately (#404 review), correctly left the link alone. The half that stops a daemon has to be at least as careful as the half that deletes a file. Covered by `test_a_symlinked_web_unit_is_not_disabled`, which fails without the guard (caddy.service appears in tree.disable). **The credential assertion could not fail.** It was written `assertTrue(path.exists() or True)` — a tautology. The intent was real: the password hash and cookie secrets must survive `web.enable: false`, because this renderer neither mints nor can re-derive them and throwing them away means the terminal cannot be turned back on. But `apply` never writes those files (--first-boot and the password helper do), so an assertion about them in a rendered-only root would have passed for the wrong reason either way. The test now creates them as a live box would have them, then asserts they survive with their content intact. Verified by mutation: teaching web_off to remove the hash makes it fail with "agent.hash was removed with the terminal". Not taken: the third finding, that the teardown should skip stopping %i instances whose template an administrator has taken over. That stop loop (`cmd_apply`, "not in config") is untouched by this PR — it predates it, and issue #413 names it as the half that already worked. On the merits it should stay: template ownership decides whether we DELETE someone's file, not whether the config still governs the box. An operator who writes `web.enable: false` is saying "no browser terminal"; keeping ttyd serving because they once edited the unit text would mean the config no longer controls the machine. Checks re-run (aarch64): agentbox-render, backend-parity, one-spec-both-backends, and the runtime flake8 gate — pass. `python3 tests/test_agentbox.py` — 74 tests, OK. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PBDHCBttvBEHQJJH24MfxF
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Addressed the review — pushed Taken: Taken: the credential assertion could not fail. Not taken: skipping the instance stop for retained administrator-owned templates. Two reasons. First, that loop is not this PR's. Second, on the merits it should stay as it is. Template ownership answers whether we delete someone's file — it does not answer whether the config still governs the box. An operator who writes Checks re-run (aarch64): |
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@coderabbitai review All three findings from the previous review are addressed in |
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The bug
bin/agentbox's render is additive:applydeletes only what a renderexplicitly queues, so a section that stops emitting files leaves the previous
apply's files — and its units — in place.
caddy()andfail2ban()werecalled under
if self.spec.web_enable:with noelse, and the webhookartifacts had no teardown at all.
The per-user
%iinstances did stop;cmd_applywalks those prefixes. Whatsurvived were the plain units nothing reconciles:
caddy.service— still listening on 80/443, with the browser terminal'sbasic auth in front of an upstream that no longer exists. A box whose owner
turned the web terminal off in config still had a public listener with the
terminal's password on it.
agent-box-fail2ban.service— a jail watching a Caddy log nobody writes.agent-web-auth-secrets.service— still projecting the terminal's secretsinto
/runon every boot.Same defect class as
codexFullAccess(#394) andprotectMemory(#404), witha public listener on the other end.
The fix
web_off()andwebhook_off(), followingmemory_protection_off(): queue thefiles, append the plain units to
t.disable, and gate the disable on the unitstill being ours — so a box that never had the feature stays quiet, and an
administrator's own copy is left alone.
Order is the reverse of startup: the jail (
PartOf=caddy.service) first, thesecrets caddy
Requires=last, so nothing is briefly running without what itdepends on.
Two things had to be solved before removal was even possible.
1. Ownership for files that cannot carry a header
remove_if_oursproves ownership by the generated header. Two things we writecannot have one:
%itemplate units, installed byte-for-byte from the profile andshared with the NixOS backend, where "generated by agentbox apply" would be
a lie;
/etc/agent-box/web-users, a TSV whose own reader (read_web_users) wouldparse a header line as a user named
# Generated by ….Both now pass a
verbatimwitness: the exact text this box would havewritten. It is strictly narrower than the header check, not wider — an
edited file no longer matches and is left alone, with the same message — and
there is a test for exactly that, because a second proof of ownership is
worthless if it is a way around the first.
2. Headers that were simply missing
The per-user env files, the per-instance drop-ins, the three
/usr/local/binwrappers and the rendered Caddyfile carried no header at all— the wrappers carried a near-miss,
# Generated by \agentbox apply`.without the— do not editthatGENERATED_HEADERactually contains. None of them was ever removable byapply, including in cases unrelated to this issue. All four formats accept#` comments; they carry the real header now.Not enumerated by hand
Listing what
caddy()andfail2ban()write is a list that goes stale themoment someone adds a file, and a forgotten entry is invisible — the file just
survives.
would_have_written()runs those same methods into a throwawayTreeand takes their.files. Guarded: a box that cannot reconstruct (afragment that grew a token the renderer does not know) still gets its units
stopped, and says in a note what it could not remove.
Deliberately left in place, and said so in the code
/etc/agent-box/<user>.hashand the cookie secrets under/var/lib/agent-box-web. This renderer neither mints nor can re-derivethem —
apply --first-bootand the password helper own them — so turningthe terminal off keeps the password for turning it back on. Nothing
reads them with caddy down.
action.dsymlink: a symlink is never "ours"(
generated_by_usrefuses one deliberately, fix(native): one canonical guide per user, and point the agents at it #404 review), and it pointsinto the profile, so it is inert once the jail is.
Tests
Three cases in the shape #404 established — two applies into one root,
which is the only way to see this:
test_turning_web_off_takes_the_public_listener_with_ittest_turning_webhooks_off_removes_the_cli_that_promises_themtest_an_edited_web_file_survives_the_teardownverbatimwitness refuses an administrator's edit to both a header-less manifest and a template unit, and says "no longer ours to remove"Each fails against master's renderer.
Effects
web.enable: falseno longer serves a password-protected port to nothing.No new privilege, no new unit, no new sudo grant.
modules/ortests/golden/movement, noAWS/Azure template change, so no stack update and no cost/IAM/networking
impact. Existing boxes pick it up at their next
agentbox update.Checks run (aarch64)
agentbox-render,backend-parity,one-spec-both-backends,module-generated-up-to-date,golden-snapshot— pass.nix build .#packages.aarch64-linux.runtime(the flake8 gate overbin/agentbox) — pass.python3 tests/test_agentbox.py— 73 tests, OK.Noticed, not fixed here
The rendered native Caddyfile now shows two banners, and the second one — from
the shared
caddyfile-header.caddyfragment — tells the reader that "editshere get OVERWRITTEN on the next nixos-rebuild" on a box that has no
nixos-rebuild. Filed separately rather than fixed here: it means touchingshared payload text, the module and the golden fixture, which is a different
review.
Closes #413.
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