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Make a missing CHECK_EPOCH fail the build instead of faking it (closes #91)
Adopt the four remaining upstream CHECK_EPOCH hardening items from
sneak/prompts #26, closing the gap #85 left open deliberately.

Fail closed on a missing value. Each check stage now asserts
`[ -n "$CHECK_EPOCH" ] || exit 1` before running anything. An unset ARG
is an empty string and an empty string is a stable cache key, so the
second and every later bare `docker build .` on an unchanged tree
replayed all three check layers, executed nothing, and still exited 0 --
and `docker build .` is the command REPO_POLICIES.md names verbatim as a
thing that must be green, so the documented command was precisely the
one that lied. Failed steps are never cached, which is what makes the
guard fire on every invocation rather than once.

Expand the epoch into each check command rather than leaving it a bare
declaration, so the cache miss does not depend on BuildKit's
unreferenced-ARG handling staying as it is, and so the value appears in
the build log where a reader can see the layer was keyed fresh.

Make the epoch unique per invocation rather than per second:
`epoch="$(date +%s%N)$$"`. `%N` alone is not enough, since busybox drops
it silently and exits 0, handing back second granularity with no
warning; `$$` differs between concurrent invocations regardless. The
bare-assignment form is kept on purpose -- inlined into an argument, a
failing substitution does not abort under `set -eu` and would yield an
empty constant epoch, restoring the exact false green this prevents.

Pass the same fresh value from script/docker. It is not the CI gate, but
local builds are almost always warm, so it was the likelier fooling in
practice, and two entrypoints disagreeing about whether the tree is
green is worse than either being wrong alone.

The ARG placement from #85 is unchanged, below apk add, COPY go.mod
go.sum and go mod download, so dependency layers still cache and the
build is not cold. Verified by negative control rather than inspection;
measurements are recorded once, in the PR verification comment.

.golangci.yml, the lint-stage FROM line and its digest, script/lint,
REPO_POLICIES.md and .gitea/workflows/check.yml are untouched.
2026-08-09 07:52:42 +00:00

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Markdown

# Workflow
* branch (from `main`)
* do the work in Next Step
* move Next Step to the top of Completed Steps
* move the top item of Future Steps into Next Step
* commit (`TODO.md` changes in the same commit as the work)
* merge to `main` if the branch is not protected, otherwise open a PR
* push
# Status
pre-1.0
# Next Step
Triage the stale remote branches (issue #71): for each, merge the work
or delete the branch.
# Completed Steps
- 2026-08-09: Adopted the remaining upstream `CHECK_EPOCH` hardening
(issue #91), closing the gap #85 knowingly left open. Four changes,
all four decided as adopt upstream in `sneak/prompts` #26. (1) Each
check stage now asserts `[ -n "$CHECK_EPOCH" ] || exit 1` before
running anything, so a build that supplies no `--build-arg` fails
instead of lying. This is the item that mattered: an unset `ARG` is
an empty string and an empty string is a stable cache key, so the
second and every later bare `docker build .` on an unchanged tree
replayed all three check layers and still exited 0 — and `docker
build .` is the command `REPO_POLICIES.md` names verbatim as a thing
that must be green, so the documented command was precisely the one
that lied. Failed steps are never cached, which is what makes the
guard fire on every invocation rather than once. (2) The epoch is now
expanded into each check command rather than left as a bare
declaration, so the cache miss no longer depends on BuildKit's
unreferenced-`ARG` handling staying as it is, and the value appears
in the build log. (3) `script/cibuild` uses
`epoch="$(date +%s%N)$$"`, unique per invocation rather than per
second; `%N` alone is insufficient because busybox drops it silently
and exits 0, and `$$` is what makes the guarantee hold regardless.
The bare-assignment form is kept deliberately — inlined in an
argument, a failing substitution does not abort under `set -eu` and
would yield an empty constant epoch, restoring the exact false green
being fixed. (4) `script/docker` passes the same fresh arg, so the
two entrypoints cannot disagree about whether the tree is green;
local builds are almost always warm, which made it the likelier
fooling in practice. The `ARG` placement from #85 is unchanged, below
`apk add`, `COPY go.mod go.sum` and `go mod download`, so dependency
layers still cache and the build is not cold. Verified by negative
control rather than inspection — a bare `docker build .` run twice
back to back, plus back-to-back pairs of both scripts and a host-side
`make check`; the measurements are recorded once, in the PR
verification comment, rather than restated here. `.golangci.yml`, the
lint-stage `FROM` line and its digest, `script/lint`,
`REPO_POLICIES.md` and `.gitea/workflows/check.yml` are all
untouched.
- 2026-08-09: Stopped `script/cibuild` from reporting a green it did
not earn (issue #85). A bare `docker build .` let Docker serve the
check layers from the layer cache whenever the tree had not changed:
the checks never executed and the build still exited 0. The fix is an
`ARG CHECK_EPOCH` declared immediately above the check `RUN`s in both
the lint stage and the builder stage (`ARG` scope is per-stage, so
each declares its own), with `script/cibuild` assigning
`epoch="$(date +%s)"` and passing `--build-arg CHECK_EPOCH="$epoch"`.
The assignment is separate on purpose: under `set -eu` a command
substitution that fails inside an argument does not abort the script,
which would leave an empty constant `CHECK_EPOCH` and restore the
very false green being fixed. Placement is the rest of the point —
the `ARG` sits below the `apk add`, `COPY go.mod go.sum`, and `go mod
download` layers, so only the checks are invalidated and the
dependency layers still cache. The guarantee is conditional on a
fresh value rather than absolute: a bare `docker build .` gets an
empty `CHECK_EPOCH` and can still serve the check layers from cache,
which `README.md` and the `Dockerfile` now say plainly, with issue
#91 tracking the upstream hardening (expanded `ARG` form, unset
guard, per-invocation epoch, `script/docker`) that would close it.
Verified by re-running the reproduction plus the withheld-`--build-arg`
counterfactual; the measurements are recorded once, in the PR #89
verification comment, rather than restated here. `.golangci.yml`, the
lint-stage `FROM` line and its digest, `script/lint`, and
`.gitea/workflows/check.yml` are all untouched.
- 2026-08-09: Corrected the `Vaultik.UI` doc comment (issue #84). It
claimed the cli layer replaces the writer with a discarding one in
`--cron` mode; the actual mechanism is `UI.SetQuiet(true)` in
`setupGlobals`, which drops Begin/Complete/Info/Notice/Detail/
Progress/Banner but still emits Warning and Error. The `--cron` line
in `README.md` said "Silent unless error", which understated what
survives, and now names warnings too. The other `--cron` comments
(`internal/log/log.go`, `internal/cli/snapshot.go`,
`internal/vaultik/snapshot.go`) were audited and already accurate.
Comments and docs only, no behavior change.
- 2026-08-09: Made `snapshot list` list the destination store without
the private key (issue #64). The listing is now the union of the
local index and a single streamed listing of the `metadata/` prefix,
with no `age_secret_key` gate — the manifest is unencrypted, so a
host holding only the public key can enumerate its own backups and a
host that lost its local index can still see them. A remote-only
snapshot's hostname and name are deliberately not recovered (they are
not recoverable without the private key, and making them so would
undo the privacy property tracked in issue #81); such rows are
labelled by an abbreviation of their remote key and carry the real
timestamp and compressed size from the manifest, with `<remote only>`
in the two columns that require the local index. Local-only snapshots
are reported as drift, and the hint now names `vaultik prune`, which
exists, instead of `vaultik snapshot cleanup`, which does not.
`reportRemoteDrift` collapsed into the merged view. Every remote
manifest read in the codebase now goes through
`downloadManifestByKey`, so issue #81 has one call site to change.
Review rework: snapshot timestamps now normalize to UTC in
`scanSnapshotRows`, the one place they enter the domain, so the merged
TIMESTAMP column cannot show local time for a locally tracked row and
UTC for a remote-only row on a non-UTC host; `GetIncompleteByHostname`
was folded onto that same scanner. `--json` now reports the
unreadable-manifest count and the 1000-row truncation on stderr
instead of returning a silently short document (the document's shape
is unchanged). The two per-snapshot `log.Warn` calls on the listing
path now route through the same JSON-aware writer as the existing
workaround, so one corrupt manifest can no longer put a log line on
stdout ahead of the document and break `| jq` — still a local
workaround pending issue #82. Verified with `script/cibuild` and with
an uncached `make check` (`0 issues.`, no cached test packages), plus
end to end against a `file://` destination with no secret key present.
- 2026-08-09: Closed the gap between `make lint` and CI (issue #78).
`script/lint` now runs the digest-pinned `golangci-lint` image taken
from the `Dockerfile` lint stage, which is the single source of truth
for the linter version; the duplicate pin in the `Makefile` `deps`
target and the unpinned `golangci-lint` install in `script/bootstrap`
are gone. A `golangci-lint` on `PATH` is used only when its version is
exactly the pinned one (which is how the lint stage runs it inside the
container); anything else goes through Docker, and a missing or
unreachable Docker daemon is a hard error rather than a silent
fallback. `make check` is therefore now as trustworthy as
`script/cibuild`.
- 2026-08-09: Finished the lint remediation under the canonical
`.golangci.yml` (issue #61, which also unblocks issue #59). The
remaining findings were fixed behavior-preservingly: `wsl_v5`
whitespace, `sqlclosecheck`, and `prealloc`. The `sqlclosecheck` sites
now close `sql.Rows` in a deferred closure instead of via the
`CloseRows` helper, which the linter could not see through. Only the
`revive` package-name findings remain suppressed, with per-site
`//nolint` directives; the package-rename question behind them is
tracked in issue #76. Verified with `script/cibuild`, which exits 0 —
that is the only trustworthy gate, because `script/lint` runs whatever
`golangci-lint` happens to be on `PATH` rather than the pinned
v2.12.2 that CI and the `Dockerfile` use, so `make check` can report
green on findings CI still fails. That tooling gap is tracked in issue
#78.
- 2026-08-09: The earlier next step "reconcile the uncommitted
`ARCHITECTURE.md` edits on `main`" needed no work: the working tree is
clean and `ARCHITECTURE.md` is committed on `main`.
- 2026-08-07: Updated golangci-lint to v2.12.2 everywhere it is pinned
(`Dockerfile` lint stage, `Makefile` deps target), replaced
`.golangci.yml` with the canonical config (v2 schema, `default: all`),
and remediated the bulk of the lint findings it surfaced (issue #61):
behavior-preserving fixes across every package, 2,990 findings down to
80. `make test` and `make fmt-check` were green at that point but
`make lint` was still red; the commit message claiming `make check`
was green was wrong.
- 2026-08-07: Added the standard `.golangci.yml` and `.editorconfig`
(issue #59); lint findings under the new config are tracked in issue
#61. `script/bootstrap` now installs sqlite3 (needed by tests).
- 2026-07-07 Adopted scripts-to-rule-them-all: `script/` entrypoints,
Makefile shims, README Entrypoints section
- 2026-07-02: Consolidated CLI verbs, retired overlapping commands; bound
the local index to its backup destination URL.
- 2026-06-28: snapshot rm now removes metadata only and prints the prune
command; restore skips chown when running as non-root.
- 2026-06-26: Snapshot IDs hashed at the storage boundary; snapshot list
made resilient to bad remote entries.
- 2026-06-24: Collapsed snapshot prune into vaultik prune; restore streams
blobs to disk and restores files in blob-locality order; cron output
fixes.
- 2026-06-17: Restore overhaul: ReadAt chunk reads from cached blobs,
reference-counted blob sweeper, integration tests; new internal/ui
output layer, banner, and progress lines.
- 2025-12-18: Added ARCHITECTURE.md and godoc coverage for exported API.
- 2025-07-26: End-to-end integration tests; manifest format refactor;
renamed backup to snapshot; afero filesystem abstraction.
- 2025-07-20: Initial design and implementation: cobra + fx CLI skeleton,
SQLite index database, UUID blob storage with streaming chunking.
# Future Steps
- Define remaining scope for a first tagged release and cut v0.1.0.