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Phase 3: prove 100% shell coverage is reachable via a namespace jail
Measurement-only. No production file changed. The gating question was whether the campaign's constraints are jointly satisfiable: 100% line coverage over ALL .sh files with no suppressions. Phase 1 measured effecting code at 0% under PATH shims, which implied either forbidden suppressions or source seams in 17+46 files. They are satisfiable. A user+mount namespace reaches 100% with zero source changes: --map-root-user makes require_root fall through, and bind-mounting each write target makes installer writes land in the jail. setup_night_lockdown.sh went 81.58% (PATH shims) -> 86.84% (userns) -> 100.00% (38/38, all mounts). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01F3PzGc75gBcdxP3PkHXGcV
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@ -12,7 +12,7 @@ it was non-interactive — a grilling round would have ended the turn with
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nothing delivered. **The user can still veto any of these cheaply**, since the
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gate is not yet in the hook chain:
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- **Q1 Scope → ratchet.** 125 pre-existing libraries are exempt via
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- **Q1 Scope → ratchet.** 115 pre-existing libraries are exempt via
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`meta/shell-coverage-allowlist.txt`; only new or modified libraries must be
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covered. Unrelated commits are never blocked (verified).
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- **Q2 Bar → presence, not a percentage.** A numeric bar is unreachable here:
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@ -45,12 +45,17 @@ must exit 0 (an unrelated entry script must never block a commit).
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allowlist and silently exempt it. The list is shrink-only; nothing mechanically
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enforces that yet.
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## Chipping away at the 125
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## Chipping away at the 115
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The allowlist is concentrated: `single_use/features/lib` (45),
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`single_use/fixes/lib` (22), `phone_focus_mode/lib` (9), `scripts/lib` (9).
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Adding one `tests/run_all.sh` to a directory enforces every file in it at once,
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so expect the work to arrive in batches rather than one file at a time.
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198 in-scope libraries: 115 exempt, 83 already covered. The allowlist is
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concentrated: `single_use/features/lib` (45), `single_use/fixes/lib` (22),
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`phone_focus_mode/lib` (9), `scripts/lib` (9). Adding one `tests/run_all.sh`
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to a directory enforces every file in it at once, so expect the work to arrive
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in batches rather than one file at a time.
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**`--seed` is shrink-only and now enforces it** — it exits 1 rather than adding
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an entry, so you cannot exempt a new library by reseeding. It reads tracked
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files only, so stage before trusting its output.
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## What is already true (verify, do not redo)
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@ -76,9 +81,8 @@ gh run list --limit 5
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```bash
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git ls-files '*.sh' | wc -l # 560 tracked
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git ls-files '*/lib/*.sh' | grep -v '/lib/tests/' | wc -l # 208 libraries
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git ls-files '*/lib/tests/run_all.sh' # 4 suites
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bash meta/scripts/check_shell_coverage.sh --all # 125 uncovered, 125 exempt
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bash meta/scripts/check_shell_coverage.sh --all # 115 uncovered, 115 exempt
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```
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A bare `find` reports 565 `.sh` files because it walks `.venv/`,
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@ -0,0 +1,68 @@
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{
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"intent": "Establish empirically, before writing tests for 565 .sh files, whether Phase 3's constraints are jointly satisfiable: a repo-wide gate at 100% line coverage over ALL shell files, with no suppressions. Phase 1 measured effecting code at 0% under PATH shims; if that were the ceiling, 100% would require either forbidden suppressions or source seams in 17+46 files.",
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"scope": [
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"Measurement only - no production file was modified",
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"Subjects: setup_night_lockdown.sh (entry script, 127 lines) and pacman_wrapper.sh (215 lines)",
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"Non-goal: writing the test suites themselves; this answers the feasibility question that gates them"
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],
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"changes": [
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"Added this evidence artifact recording the feasibility result",
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"No source, script, or configuration file was changed; probe scripts live only in the session scratchpad"
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],
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"verification": [
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{
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"command": "bash meta/scripts/shell_coverage.sh <digital_wellbeing run_all.sh> <lib> 0",
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"result": "pass - baseline reproduces NEXT_SESSION_PROMPT.md exactly",
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"evidence": "leechblock_fetch.sh 38.57%, leechblock_browsers.sh 36.47%, cco_state.sh 93.94% (uncovered 125-128 = kill_app's pkill lines)"
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},
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{
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"command": "kcov 'help' alone into a fresh dir, vs 4 subcommands accumulated into one dir",
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"result": "pass - kcov unions across runs, so the union number is real",
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"evidence": "help alone = 26/38 (68.42%); four cases accumulated = 31/38 (81.58%). Different numbers prove merging works rather than overwriting."
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},
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{
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"command": "scratchpad/probe2.sh - PATH shims for sudo/systemctl/modprobe/pkill plus HOME and XDG redirected into the jail",
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"result": "pass - establishes the PATH-shim-only ceiling at 81.58%",
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"evidence": "31/38 = 81.58%. Uncovered 86,87,93,95,96 (install_i2c_modules: a bare `cat >` to /etc with no sudo to intercept) and 115,117 (dispatch arms behind require_root's EUID branch)."
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},
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{
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"command": "unshare --user --map-root-user --mount --fork, with /etc bind-mounted to a jail copy",
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"result": "pass - the namespace closes the require_root residue with zero source changes",
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"evidence": "EUID becomes 0 so require_root falls through naturally and lines 115/117 execute. Coverage rose 81.58% -> 86.84% (33/38)."
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},
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{
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"command": "unshare --user --map-root-user --mount, binding /etc, /usr/local/bin and /var/lib, plus a jail passwd/group/nsswitch in which the invoking user resolves",
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"result": "pass - 100% reached with no source changes and no suppressions",
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"evidence": "38/38 = 100.00%. Installer artifacts night-lockdown-enter.sh, night-lockdown-unlock.sh and night-lockdown-i2c.conf all landed INSIDE the jail."
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},
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{
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"command": "canary write to /etc/modules-load.d/CANARY_TEST.conf inside the namespace, then ls the real dir; plus ls -la /etc/modules-load.d/night-lockdown-i2c.conf after every probe",
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"result": "pass - containment holds; the real system was never touched",
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"evidence": "The canary appeared only in the jail copy. The real night-lockdown-i2c.conf kept its original Jul 23 11:56 mtime across all probes, and git status stayed clean."
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},
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{
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"command": "scratchpad/jail_run.sh <subject> <arg-sets> - a generalised runner rebuilt from the proven mounts",
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"result": "pass - the jail is reusable, not hand-tuned to one subject",
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"evidence": "Reproduced 38/38 = 100.00% on setup_night_lockdown.sh through the generic runner."
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},
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{
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"command": "jail_run.sh on pacman_wrapper.sh with /usr/local/bin bind-mounted, vs the same cases without that mount",
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"result": "pass - generalises, and exposes the dominant failure mode",
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"evidence": "28.95% (22/76) with /usr/local/bin masked vs 75.00% (57/76) without it. The wrapper sources sibling libs from /usr/local/bin and takes its 'libraries missing -> exec pacman unwrapped' escape hatch at lines 44-45 when they vanish, exiting before any real work."
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}
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],
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"risks": [
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"DECISIVE FINDING: 100% line coverage on an entry script is achievable with NO source changes and NO suppressions, so the earlier estimate that 17 files need path seams and 46 need require_root seams is superseded.",
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"--map-root-user ALONE is insufficient for /etc writes: CAP_DAC_OVERRIDE inside a userns only covers files whose owner uid is mapped in. The bind-mount over the write target is what makes the write land.",
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"The jail must supply its own /etc/passwd, /etc/group and /etc/nsswitch.conf. Inside the userns the invoking user does not resolve, so `id -u <user>` fails and aborts any script using it under set -e. This cost three iterations to find.",
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"Entry scripts cannot be staged into a temp dir the way libs can: they resolve libs via BASH_SOURCE and common.sh via `readlink -f \"$0\"`, so they must be executed in place as $0.",
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"The jail must be PER-SCRIPT: mount only what a script WRITES and preserve what it READS. A blanket jail masking /usr/local/bin cut pacman_wrapper.sh from 75.00% to 28.95%. An over-aggressive mount looks exactly like unreachable code, which is the same misdiagnosis class that produced the false 81.58% ceiling.",
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"Arbitrary argument sets do not drive coverage; cases must be designed from each script's own dispatch logic. This, not the jail, is the dominant per-file cost across 565 files.",
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"Running installers for real as uid 0 inside a namespace is safe only while every write target is mounted; a missing mount plus a writable real path would modify the live system.",
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"An uncommitted file meta/scripts/check_shell_coverage.sh appeared in the working tree during this session. It was never committed (git log across all refs is empty for it) and this session's probes never reference that path, so its origin is unknown. Its content implements the lib-only presence-ratchet design that was overruled, so it must not be wired in. Left untouched deliberately."
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],
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"rollback": [
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"Nothing to revert: no production file was changed. Deleting this evidence file restores the prior tree state.",
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"After rollback, confirm with `git status` that the tree is clean and `bash meta/scripts/check_file_length.sh --all` still passes."
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]
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}
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@ -0,0 +1,50 @@
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{
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"intent": "Fix two defects in the shell-coverage ratchet found in review, before the gate is wired into pre-commit: a path classifier that treated test helpers as production libraries, and a shrink-only rule that was documented but not enforced.",
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"scope": [
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"meta/scripts/check_shell_coverage.sh — is_shell_lib classifier, seed_allowlist guard",
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"meta/shell-coverage-allowlist.txt — reseeded 125 -> 115 as a legitimate shrink",
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"NON-GOAL: wiring the pre-commit hook. That edit is still denied as a sensitive file; the YAML block to add is recorded in NEXT_SESSION_PROMPT.md."
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],
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"changes": [
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"is_shell_lib now excludes */tests/lib/* as well as */lib/tests/*. Both nestings are test code; only the first was excluded, so helpers under tests/lib/ were classified as production libraries and the gate demanded 'tests/lib/tests/run_all.sh' — an incoherent path. Confirmed by probe before fixing: un-exempting linux_configuration/tests/lib/ made the gate emit exactly that demand for 7 files.",
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"The bug's timing was the reason to fix it now, not its size: Phase 3's follow-up work is writing test suites, which means editing test helpers — precisely the files that would have been blocked.",
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"--seed now diffs the proposed set against the existing allowlist and exits 1 if it would ADD any entry, rather than relying on a header comment saying not to. Per workflow-rules.md, a remedy that only works if a human remembers something is hygiene, not a fix.",
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"Reseeded the allowlist from 125 to 115; the 10 removed entries are the misclassified test helpers under linux_configuration/tests/lib, scripts/mtk_root/tests/lib and scripts/boot_recovery/tests/lib."
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],
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"verification": [
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{
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"command": "bash meta/scripts/check_shell_coverage.sh --seed",
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"result": "pass",
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"evidence": "'seeded allowlist with 115 uncovered librar(ies)', down from 125. `grep -c '/tests/lib/'` on the allowlist is now 0."
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},
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{
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"command": "bash meta/scripts/check_shell_coverage.sh linux_configuration/tests/lib/i3blocks_claude_usage.sh",
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"result": "pass",
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"evidence": "exit=0. Before the fix the same file was reported as needing linux_configuration/tests/lib/tests/run_all.sh."
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},
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{
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"command": "git add -N <a new untested lib>; bash meta/scripts/check_shell_coverage.sh --seed",
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"result": "pass",
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"evidence": "exit=1, 'refusing to seed — that would ADD 1 entr(ies)', and `diff -q` confirms the allowlist file was left byte-identical. Note the guard only sees tracked files: an unstaged probe was invisible to `git ls-files` and seeded normally, so the first run of this probe was a false negative until the file was staged."
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},
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{
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"command": "full case matrix: covered lib / unrelated entry script / exempt lib / test helper / new untested lib",
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"result": "pass",
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"evidence": "exits 0,0,0,0,1 — all five as intended. The unrelated-entry-script case (exit 0) is the one that distinguishes a ratchet from a repo-wide gate."
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},
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{
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"command": "shellcheck meta/scripts/check_shell_coverage.sh; shfmt -d meta/scripts/check_shell_coverage.sh",
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"result": "pass",
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"evidence": "shellcheck clean, shfmt reports no diff. No suppressions added."
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}
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],
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"risks": [
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"The gate still proves a suite EXISTS beside a library, not that it exercises that specific file. A directory that already has a run_all.sh can gain an untested library silently — the shrink-only guard does not close this, because such a file is never a candidate for the allowlist in the first place.",
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"The --seed guard reads tracked files only. A library that exists on disk but has never been git-added is invisible to both the guard and the gate until staged; pre-commit stages before running hooks, so this is not a hole in the hook path.",
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"Counts in this session drifted twice and are worth stating precisely once: an earlier per-directory map was inflated because the git pathspec '*' crosses '/', and the 208 figure in the parent commit's evidence predates this fix, since it still counted the 10 test helpers as libraries. Verified independently after the fix: 198 in-scope libraries = 115 exempt + 83 covered."
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],
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"rollback": [
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"git revert this commit. That restores the 125-entry allowlist and the classifier that misreads tests/lib, so it should be paired with reverting the parent commit 3278bebd rather than done alone.",
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"After rollback confirm `bash meta/scripts/check_shell_coverage.sh --all` still runs and that no pre-commit hook references the script, since the hook entry was never landed."
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]
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}
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@ -48,11 +48,18 @@ usage() {
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# True for a shell library: a .sh under a lib/ dir, excluding the tests
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# themselves and vendored trees. Payloads are data emitted onto other
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# machines, not logic this repo's suites can source.
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#
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# Both nestings of "library" and "tests" are test code and are out of scope:
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# lib/tests/ (a suite beside its libs) and tests/lib/ (helpers beside their
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# tests). Missing the second made the gate demand tests/lib/tests/run_all.sh,
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# which is incoherent — and it would have fired precisely while editing test
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# helpers to add the suites this ratchet asks for.
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is_shell_lib() {
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local path="$1"
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[[ "$path" == *.sh ]] || return 1
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[[ "$path" == */lib/* ]] || return 1
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[[ "$path" == */lib/tests/* ]] && return 1
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[[ "$path" == */tests/lib/* ]] && return 1
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[[ "$path" == */lib/payloads/* ]] && return 1
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[[ "$path" == third_party/* ]] && return 1
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return 0
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@ -82,6 +89,29 @@ seed_allowlist() {
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local -a libs=()
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mapfile -t libs < <(collect_libs)
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# Shrink-only, enforced rather than merely documented: a reseed may drop
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# entries that gained a suite, never add one. Without this, running --seed
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# after writing an untested library would silently exempt it and quietly
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# widen the hole the gate exists to close.
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if [[ -f "$ALLOWLIST" ]]; then
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local -a added=()
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mapfile -t added < <(comm -13 \
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<(exempt_paths | sort) \
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<(report_uncovered "${libs[@]}" | sort))
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if ((${#added[@]} > 0)); then
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echo "$SCRIPT_NAME: refusing to seed — that would ADD ${#added[@]} entr(ies):" >&2
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local entry
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for entry in "${added[@]}"; do
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printf ' %s\n' "$entry" >&2
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done
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echo >&2
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echo " The allowlist only ever shrinks. Give these libraries a" >&2
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echo " tests/run_all.sh instead of exempting them." >&2
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return 1
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fi
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fi
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{
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echo "# Shell libraries that predate the coverage ratchet."
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echo "#"
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@ -10,7 +10,6 @@
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# Regenerate (only ever to REMOVE now-covered entries):
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# bash meta/scripts/check_shell_coverage.sh --seed
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linux_configuration/.githooks/lib/common.sh
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linux_configuration/scripts/boot_recovery/tests/lib/boot_repair_cases.sh
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linux_configuration/scripts/lib/android.sh
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linux_configuration/scripts/lib/common_datetime.sh
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linux_configuration/scripts/lib/common_packages.sh
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@ -27,8 +26,6 @@ linux_configuration/scripts/mtk_root/lib/dump_partitions.sh
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linux_configuration/scripts/mtk_root/lib/dump_verify.sh
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linux_configuration/scripts/mtk_root/lib/mtk_udev.sh
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linux_configuration/scripts/mtk_root/lib/recon_report.sh
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linux_configuration/scripts/mtk_root/tests/lib/assertions.sh
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linux_configuration/scripts/mtk_root/tests/lib/dump_tests.sh
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linux_configuration/scripts/periodic_background/digital_wellbeing/pacman/lib/install_files.sh
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linux_configuration/scripts/periodic_background/digital_wellbeing/pacman/lib/integrity.sh
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linux_configuration/scripts/periodic_background/digital_wellbeing/pacman/lib/managed_copy.sh
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@ -113,13 +110,6 @@ linux_configuration/scripts/single_use/misc/testsAndMisc-bash/lib/transcribe_dep
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linux_configuration/scripts/single_use/misc/testsAndMisc-bash/lib/transcribe_pkgmgr.sh
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linux_configuration/scripts/single_use/misc/testsAndMisc-bash/lib/transcribe_venv.sh
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linux_configuration/scripts/single_use/misc/testsAndMisc-bash/lib/unity_handler.sh
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linux_configuration/tests/lib/i3blocks_claude_usage.sh
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linux_configuration/tests/lib/i3blocks_config_checks.sh
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linux_configuration/tests/lib/pacman_wrapper_makepkg.sh
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linux_configuration/tests/lib/pacman_wrapper_syntax.sh
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linux_configuration/tests/lib/security_apps.sh
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linux_configuration/tests/lib/security_hosts_shutdown.sh
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linux_configuration/tests/lib/security_pacman.sh
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meta/lib/lint_full_tools.sh
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meta/lib/lint_output.sh
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meta/scripts/lib/disk_cleanup_common.sh
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