sfdupes/TODO.md

# Workflow

- Take an issue from the `1.0.0` milestone on the tracker. Work that is not on
  the tracker yet is filed as an issue first.
- Branch from `next`.
- Do the work, with tests, in small focused commits.
- Record the step at the top of Completed Steps, in the same commit as the work.
- Push the branch and open a PR against `next`. Its title ends with
  ` (closes #N)`.
- An independent review gates each merge to `next`. Every finding is addressed
  or rebutted on the PR.
- Only the owner merges `next` into `main`.

# Status

- Pre-1.0.
- The tracker is authoritative for the backlog. The open issues under the
  `1.0.0` milestone are what remains before the tag. This file records history
  and process, not the queue.

# Next Step

- Take the next issue from the `1.0.0` milestone:
  https://git.eeqj.de/sneak/sfdupes/milestone/17. The issues are not restated
  here, because a copy drifts as soon as the tracker moves.

# Completed Steps

Newest first. Each entry ends with its date and its issue or branch.

- `TODO.md` rewritten from scratch by the same rules as `README.md`: short
  sentences, lists as bullets, nothing a newcomer reads twice. Every completed
  step is kept, with its date and issue, in fewer words. The policy-compliance
  checklist of 2026-07-22 is folded into its step (2026-10-26,
  https://git.eeqj.de/sneak/sfdupes/issues/135)

- `README.md` rewritten from scratch, sentence by sentence, as a newcomer reads
  it. It leads with what the program is and how to use it. A reference section
  covers the settings, the database, the output formats and the exit codes;
  development and testing come last. Every statement was checked against the
  code on `next` (2026-10-26, https://git.eeqj.de/sneak/sfdupes/issues/135)

- A file or directory removed while the scan runs is not an error, in the walk
  or in the hash phase. The scan prints no line for it and does not count it as
  skipped. When the first of several hard links to a file is gone, the hash
  phase reads the next one instead. On a terminal every progress display starts
  with the spinner, the hash phase's included. A phase with an exact total ends
  its line with its percent and a 10-column bar at the terminal's right edge,
  which no longer moves as the line's length changes. A line too wide for the
  terminal now loses its rate before its bar. The time remaining is labelled
  `remain`, not `eta` (2026-10-26, https://git.eeqj.de/sneak/sfdupes/issues/133)

- The `head`, `tail` and `content` columns are BLOBs, each holding the raw 32
  bytes of a SHA-256, half the size of the hex text they held. The hashes stay
  raw from the hash phase through the database to `report` and `trees`. Reading
  a record whose hash is not 32 bytes is an error (2026-10-26,
  https://git.eeqj.de/sneak/sfdupes/issues/134)

- Every file the walk records gets three hashes in the hash phase. `head` and
  `tail` are the SHA-256 of its first and last 64 KiB. `content` is the SHA-256
  of the whole file under 100 MiB, and of 1 MiB at each gigabyte from 100 MiB
  up. The 10 MiB and 50 MiB thresholds, the size census, the records without
  hashes and the content phase are gone. A scan has four phases, and a rescan
  reads only new and changed files. `info` no longer counts the records with
  hashes, since every record has them (2026-10-25,
  https://git.eeqj.de/sneak/sfdupes/issues/132)

- `REPO_POLICIES.md` and the four scripts that pass `CACHEBUST` re-vendored from
  `sneak/prompts` `next` at `0653579`. The module download in the `lint`, `test`
  and `builder` stages of the `Dockerfile`, and the package install in
  `builder`, now come before `ARG CACHEBUST`. Docker keeps them between builds.
  Every step that lints, tests or compiles still comes after it.
  `golangci-lint run` also keeps golangci-lint's cache. README says the same
  (2026-10-18, https://git.eeqj.de/sneak/sfdupes/issues/109)

- Release rule set: until 1.0, each tip of `main` that passes the build gets the
  next `v0.0.N` tag, so `go install sneak.berlin/go/sfdupes@latest` installs it.
  `go.mod` retracts `v0.0.1`, the early build without a database. When the
  linker set no version, `sfdupes --version` prints the version Go recorded in
  the binary: the tag, or the pseudo-version of a `go install` build. It prints
  `dev` only when neither is known. README "Install" documented the rule, what
  `@main` and `v0.0.1` give, and how to check an installed binary (2026-10-17,
  https://git.eeqj.de/sneak/sfdupes/issues/116)

- `scan` creates the database's directory where the database path leads. The
  directory is the path with its last element cut off as text, never cleaned. A
  `..` after a symlinked directory therefore goes through the symlink, as it
  does when the file is opened. With
  `SFDUPES_DATABASE=/srv/link/../new/db.sqlite` and `/srv/link` a symlink to
  `/data/x`, it now creates `/data/new` and the database in it. It used to
  create `/srv/new` and then fail (2026-10-17,
  https://git.eeqj.de/sneak/sfdupes/issues/119)

- `scan` never records its own database. Once the database and its `.lock` file
  are open, it notes the device and inode of the database file, its `-wal` and
  `-shm` files and the `.lock` file. The walk passes over a file with one of
  them wherever it reaches it, through a symlinked directory included, printing
  no line and counting nothing. A record an earlier scan left for one of them is
  deleted (2026-10-17, https://git.eeqj.de/sneak/sfdupes/issues/115)

- `scan` never records or reads anything on a filesystem that is not persistent:
  `tmpfs`, `proc`, `sysfs` and the other kernel or memory-backed types. It
  matches them by device ID, listed as the scan starts from
  `/proc/self/mountinfo` on Linux and from the mount list on macOS. No flag
  turns that off. Below an operand, the walk does not enter the default excludes
  either, so `sfdupes scan /` skips the kernel's view of the running system and
  the temporary directories. On Linux those are `/proc`, `/sys`, `/dev`, `/run`,
  `/tmp` and `/var/tmp`. On macOS they are `/dev`, `/private/tmp`,
  `/private/var/tmp`, `/private/var/vm`, `/System/Volumes/VM` and
  `/System/Volumes/Data`. A Windows list exists in the code but is not used. An
  operand at or inside a default exclude is still walked. The scan prints a line
  for each path it leaves out, without counting it as skipped, and the records
  there count as outside the scanned operands, as for `-x`.
  `--no-default-excludes` turns off the default excludes only, and `scan --help`
  lists them (2026-10-17, https://git.eeqj.de/sneak/sfdupes/issues/124)

- The rate a progress display shows covers the items completed over the last 5
  seconds, or since the line before when stderr is not a terminal. It falls to 0
  while nothing completes, and a burst after a wait no longer reads as a steady
  rate. The time remaining still comes from the phase's average. Once no item
  has completed for 10 seconds, the word `stalled` and where the phase waits
  take the rate's place, as `stalled disk/db`. The places are `disk`, `db`,
  `out` for stdout and `cpu`, or two of them for a phase that may wait on
  either. A line too wide for the terminal loses its bar first, then its rate or
  those words, so the phase, progress, elapsed time and time remaining stay
  whole. The content phase's last partial batch is written under a display of
  its own (2026-10-16, https://git.eeqj.de/sneak/sfdupes/issues/125)

- New subcommand `info` prints the database's details on stdout, one per line as
  a name, a tab and the value (2026-10-16,
  https://git.eeqj.de/sneak/sfdupes/issues/117):
    - the path and where it came from;
    - the sizes of the database file and of its `-wal` file, when there is one;
    - when the database file was last changed;
    - the schema version, the record counts and the sizes of all records added
      up.

    It opens the database as `report` does and shows two phases on stderr,
    `[1/2] open` and `[2/2] count`. The schema version and the counts come from
    one read-only transaction, the counts from one query.

- `report` shows its work on stderr in two phases, `[1/2] open` and
  `[2/2] read`, with the progress display `scan` and `trees` use. The display
  runs from the moment `report` starts until the summary line. `open` says it is
  opening the database, also while it waits on a busy one. `read` counts the
  records, then reads them against that count in signature order. SQLite takes
  that order from the `files_signature` index without sorting, so the first
  record comes at once. `report` forms the duplicate groups itself, holding only
  those of the size it is reading, and writes them ordered by first path before
  it reads the next size. stdout and the summary line are unchanged, and SQLite
  no longer needs a temporary file to sort in (2026-10-16,
  https://git.eeqj.de/sneak/sfdupes/issues/114)

- `trees` shows its work on stderr in four phases, `[1/4] open`, `[2/4] read`,
  `[3/4] group` and `[4/4] write`, each with the progress display `scan` uses.
  The display runs from the moment `trees` starts until the summary line. `open`
  says it is opening the database, also while it waits on a busy one. `read`
  counts the records, then reads them against that count. `group` counts the
  directories it groups, and `write` the groups it writes. A display's rate
  names what its phase counts: files, records, directories or groups. stdout and
  the summary line are unchanged. When stdout and stderr are the same file, as
  one terminal is, no line of stdout shares a line with the display. When they
  are not, the display keeps being drawn while stdout waits on a slow reader
  (2026-10-16, https://git.eeqj.de/sneak/sfdupes/issues/113)

- Each `scan` phase's progress display names the phase and its place among the
  five, as `[2/5] walk`, from the moment it starts, with its progress, elapsed
  time and ETA. `load` counts the records first. The walk's total is estimated
  from the records under the operands. The content phase counts the records it
  checks from SQLite's grouping alone, then says it is searching the database
  until the first one is returned. On a terminal a phase with an exact total
  draws its line followed by the library's bar, and any other a spinner followed
  by the line. Every display is drawn again several times a second. No line
  reaches the terminal's last column, however narrow, also after the terminal is
  made narrower during a phase. A line too wide leaves out its rate, then its
  bar, keeping the phase, progress, elapsed time and ETA whole. It is cut short
  only when those alone do not fit, as below about 70 columns late in a large
  scan. In plain mode the line is printed every 5 seconds whether or not an item
  completed (2026-10-16, https://git.eeqj.de/sneak/sfdupes/issues/112)

- `scan`, `report` and `trees` first print a line on stderr naming the database
  they use, as an absolute path, and whether that path is the default or comes
  from `SFDUPES_DATABASE`. `scan` says when the database is new. README
  "Database" says when `scan` writes each file (2026-10-16,
  https://git.eeqj.de/sneak/sfdupes/issues/111)

- The canonical files and model scripts re-vendored from `sneak/prompts` `next`
  at `e3f79c4` (2026-10-15, https://git.eeqj.de/sneak/sfdupes/issues/95):
    - golangci-lint v2.14.0;
    - lint and test are phases of the `Dockerfile` that write no image, and
      `make test` runs the suite under the race detector. `Dockerfile.lint`,
      `script/verify-lint-image-pin` and `make test-race` are gone;
    - every `docker build` in `script/` passes a new `CACHEBUST` value, which
      every stage of the `Dockerfile` declares first, so every `RUN` step runs
      on every build. The steps that compile keep Go's build cache, and the
      tests run with `-count=1`;
    - prettier runs on the host, from the node and yarn `script/bootstrap`
      installs, so the `prettier` and `markdown` stages are gone and the build
      stage installs `git` and `make` itself;
    - a new push cancels the workflow's older run on the same branch, and a run
      stops after 20 minutes;
    - `.claude/settings.json` is deleted.

    Since https://git.eeqj.de/sneak/sfdupes/issues/109 the module download in
    `lint`, `test` and the build stage, and the install of `git` and `make` in
    the build stage, come before `ARG CACHEBUST`. Docker keeps them between
    builds, and every step that lints, tests or compiles still runs on every
    build.

- With `-x`, an operand under another operand is no longer dropped when the
  outer operand's walk cannot reach it. That is the case when a directory from
  the inner operand up to, but not including, the outer one is on a different
  filesystem than the outer one. The inner operand is then walked on its own.
  For a regular-file operand the directories checked start at its directory. The
  records of files gone from below it are deleted (2026-10-14,
  https://git.eeqj.de/sneak/sfdupes/issues/106)

- With `-x`, `scan` keeps the records below a directory on another filesystem
  under its operand, and counts their sizes in the size census, instead of
  deleting them (2026-10-14, https://git.eeqj.de/sneak/sfdupes/issues/99)

- The hash and content phases open each file without blocking and check that it
  is still a regular file. A file replaced by a FIFO or device node after it was
  statted is warned about and skipped instead of hanging the scan (2026-10-14,
  https://git.eeqj.de/sneak/sfdupes/issues/100)

- The scan lock file is named from the database's path with symlinks resolved,
  after `scan` creates the database file if it is missing. A scan through a
  symlink to the database therefore fails while another scan holds the lock
  (2026-10-14, https://git.eeqj.de/sneak/sfdupes/issues/101)

- On a terminal, a warning for the last file of a phase no longer erases the
  phase's finished bar. The bar is drawn again below the warning (2026-10-14,
  https://git.eeqj.de/sneak/sfdupes/issues/102)

- `scan` records the mtime to the nanosecond, as whole seconds in `mtime` plus
  `mtime_nsec`, and compares it at that resolution. A same-size rewrite within
  the same second is hashed again (2026-10-07,
  https://git.eeqj.de/sneak/sfdupes/issues/12)

- The narration was cut from `TODO.md` Completed Steps and from the comments in
  `script/`, `Dockerfile` and `Dockerfile.lint` (gone since
  https://git.eeqj.de/sneak/sfdupes/issues/95). The Workflow section now
  branches from and merges to `next` (2026-10-04,
  https://git.eeqj.de/sneak/sfdupes/issues/49)

- `make test-race` ran the test suite under the race detector in a cgo-enabled
  container, outside `make check`. Since
  https://git.eeqj.de/sneak/sfdupes/issues/95 `make test` itself runs the suite
  under the race detector, in the `Dockerfile`'s Debian-based `test` phase, and
  `make test-race` is gone (2026-10-04,
  https://git.eeqj.de/sneak/sfdupes/issues/18)

- A bare `docker build .` failed, naming `script/cibuild` and `script/docker`,
  rather than serve the gates from cache. Since
  https://git.eeqj.de/sneak/sfdupes/issues/95 a bare build succeeds, as
  `REPO_POLICIES.md` requires, and may serve the gates from cache. The builds in
  `script/` pass a new `CACHEBUST` value, so theirs always run (2026-10-04,
  https://git.eeqj.de/sneak/sfdupes/issues/39)

- `make fmt` and `make fmt-check` run prettier over all Markdown, and CI checks
  it. All Markdown was reformatted (2026-10-04,
  https://git.eeqj.de/sneak/sfdupes/issues/19)

- `script/lint` writes no image, so a run no longer leaves an untagged one
  behind (2026-10-04, https://git.eeqj.de/sneak/sfdupes/issues/48)

- Tests cover a missing database, `scan` keeping stdout empty, its skip warning,
  the `report` and `trees` summary lines, and every subcommand going through
  `runE` (2026-10-04, https://git.eeqj.de/sneak/sfdupes/issues/16)

- `.golangci.yml` replaced with the current canonical copy, which uses
  `gomodguard_v2`, so lint no longer prints a deprecation warning (2026-10-04,
  https://git.eeqj.de/sneak/sfdupes/issues/26)

- A test fails when either `hashWorker` cancellation check in `scan.go` is
  removed (2026-10-04, https://git.eeqj.de/sneak/sfdupes/issues/83)

- A database path holding `?`, `#` or `%` opens exactly the file it names
  (2026-10-04, https://git.eeqj.de/sneak/sfdupes/issues/55)

- `scan` rejects `--workers` below 1 as a usage error instead of running
  single-threaded (2026-10-04, https://git.eeqj.de/sneak/sfdupes/issues/10)

- A test fails when either walk cancellation check in `scan.go` is removed
  (2026-10-04, https://git.eeqj.de/sneak/sfdupes/issues/81)

- A test checks that `scan` refuses a database with another schema version
  (2026-10-04, https://git.eeqj.de/sneak/sfdupes/issues/64)

- Four inaccurate comments in `cancel_test.go` corrected, and
  `walkCancelInFlightDirs` renamed to `walkCancelInFlightFiles` (2026-10-04,
  https://git.eeqj.de/sneak/sfdupes/issues/33)

- The `-x` filesystem-boundary rules in `subdirJob` are tested (2026-10-04,
  https://git.eeqj.de/sneak/sfdupes/issues/17)

- `scan` creates the schema in one transaction. A version-0 database with a
  `files` table is refused with a clear schema-version error (2026-10-04,
  https://git.eeqj.de/sneak/sfdupes/issues/11)

- README documents install, Docker, a daily cron scan and how to read and check
  the reports (2026-10-04, https://git.eeqj.de/sneak/sfdupes/issues/54)

- The `Dockerfile` build stage kept the Go module cache out of `builder`'s home
  and copied the sources with `--chown`, so no `chown -R` walked them. Since
  https://git.eeqj.de/sneak/sfdupes/issues/95 there is no `builder` user and
  nothing changes owner: the build stage only compiles, as root, and the tests
  run as `nobody` in the `test` phase (2026-10-04,
  https://git.eeqj.de/sneak/sfdupes/issues/43)

- `--version` prints `sfdupes VERSION` to stdout. README documents it and
  `--help` (2026-10-04, https://git.eeqj.de/sneak/sfdupes/issues/15)

- `scan` stops cleanly on `SIGINT` or `SIGTERM`: it commits what it has hashed,
  deletes nothing more, and exits 1 (2026-10-04,
  https://git.eeqj.de/sneak/sfdupes/issues/5)

- `report` and `trees` stream the records instead of holding them all in memory.
  The schema gains the `files_signature` index (2026-10-04,
  https://git.eeqj.de/sneak/sfdupes/issues/14)

- Progress prints at once on a non-terminal, uses a real terminal test, and
  prints warnings through a spinner instead of racing its redraw (2026-10-03,
  https://git.eeqj.de/sneak/sfdupes/issues/13)

- Symlink, socket, FIFO, device and `.zfs` operands are warned about and
  skipped, and the records beneath them are kept (2026-10-03,
  https://git.eeqj.de/sneak/sfdupes/issues/9)

- `scan` holds a lock on a lock file beside the database for its whole run, so a
  second `scan` fails at once with exit 1 (2026-10-03,
  https://git.eeqj.de/sneak/sfdupes/issues/53)

- Tests cover stdout write failures in `report` and `trees`. README states that
  `| head` ends sfdupes by `SIGPIPE` and that `>&-` writes to `/dev/null`
  (2026-10-03, https://git.eeqj.de/sneak/sfdupes/issues/30)

- `report` and `trees` open the database read-only, and `scan` leaves it out of
  WAL mode, so reading needs only read access (2026-10-03,
  https://git.eeqj.de/sneak/sfdupes/issues/8)

- Tabs, newlines, carriage returns and backslashes are escaped in report, trees
  and warning paths. The root directory's path is `/` (2026-10-03,
  https://git.eeqj.de/sneak/sfdupes/issues/7)

- A plain `docker build .` stamps the git tag or short commit instead of `dev`.
  `.dockerignore` sends `.git` without `.git/config`. The build stage stamps the
  `VERSION` build argument, else `git describe --tags --always`. It fails if the
  context carries `.git` and the version is still empty, `dev` or `unknown`. CI
  checks out the full history (`fetch-depth: 0`), so it stamps the same value as
  `make build` (2026-10-02, branch `next`,
  https://git.eeqj.de/sneak/sfdupes/issues/67)

- The 1 KiB end-window sampling was replaced with the head/tail plus
  content-hash ladder, and README "Duplicate detection" documented every rung. A
  file under 10 MiB was hashed in full, and its `head`, `tail` and `content` all
  held that hash. A larger file got only its 64 KiB `head` and `tail` in the
  hash phase. The content phase, after the update phase, read it for `content`
  only when its size, `head` and `tail` matched another record's. `content` was
  the whole file below 50 MiB, and gigabyte-spaced 1 MiB samples at or above. A
  file gone or changed since its record was written was never read. `report` and
  `trees` left out any record without a `content` hash. The `content` column is
  part of the version 1 schema. Superseded by
  https://git.eeqj.de/sneak/sfdupes/issues/132 (2026-09-22, branch `next`,
  https://git.eeqj.de/sneak/sfdupes/issues/61)

- The dead `files.dat` references removed from `Makefile`, `.gitignore` and
  `.dockerignore` (2026-09-21, branch `next`,
  https://git.eeqj.de/sneak/sfdupes/issues/22)

- The lint-image pin comments and `FROM` form in `Dockerfile` and
  `Dockerfile.lint` fixed. Both pins became the policy
  `# image:vX.Y.Z, YYYY-MM-DD` comment over a bare `FROM image@sha256:...`,
  without the false `(Debian-based)` note or the tag. Since
  https://git.eeqj.de/sneak/sfdupes/issues/95 the `Dockerfile`'s `lint` phase
  holds the only golangci-lint pin, in that form. `Dockerfile.lint` and
  `script/verify-lint-image-pin`, which compared the two pins, are gone
  (2026-08-10, branch `next`, https://git.eeqj.de/sneak/sfdupes/issues/25)

- All linting runs in Docker, via `Dockerfile.lint` and `script/lint`. Per the
  owner ruling the linter is never installed on a host, and
  `golangci-lint config verify` runs before `golangci-lint run`.
  `script/bootstrap` stopped installing or pinning the linter, and
  `script/verify-linter-pin` was retired. Since
  https://git.eeqj.de/sneak/sfdupes/issues/95 both commands run in the
  `Dockerfile`'s `lint` phase, which `script/lint` builds alone and the build
  stage depends on through `COPY --from=lint /src/go.sum /dev/null`.
  `Dockerfile.lint` and `script/verify-lint-image-pin` are gone. Nothing inside
  an image build may run docker, so the phase calls `golangci-lint` directly
  (2026-08-10, branch `next`, https://git.eeqj.de/sneak/sfdupes/issues/46)

- The Docker build stage's prerequisites were installed by running
  `script/bootstrap` instead of `apk add --no-cache make` inline.
  `script/verify-linter-pin` failed the build unless the linter copied from the
  lint stage was the version `script/bootstrap` pinned. Builds then took up to
  5m14s cold, mostly in a `chown -R` of the module cache, filed as
  https://git.eeqj.de/sneak/sfdupes/issues/43. Since
  https://git.eeqj.de/sneak/sfdupes/issues/95 the build stage installs `git` and
  `make` with `apk add --no-cache` and only compiles; the `lint` and `test`
  phases are the gates (2026-08-09, branch `dockerfile-bootstrap`,
  https://git.eeqj.de/sneak/sfdupes/issues/42)

- The Docker layer cache is busted for the gate steps, so `script/cibuild` and
  `script/docker` cannot report a green they did not earn. The `Dockerfile`
  copies the tree before its gates, so on an unchanged tree Docker served them
  from cache and the build exited 0 having run nothing. The fix was a
  `CHECK_EPOCH` build argument. Since
  https://git.eeqj.de/sneak/sfdupes/issues/95 every `docker build` in `script/`
  passes a new `CACHEBUST` value instead, which every stage of the `Dockerfile`
  declares before every step that lints, tests or compiles. Run as root, the
  tests fail `TestScanHardlinkRunFailsTogether`, because root reads through the
  `chmod(0)` the test relies on, so the `test` phase runs them as `nobody`
  (2026-08-09, branch `cibuild-cache-bust`,
  https://git.eeqj.de/sneak/sfdupes/issues/32)

- `script/bootstrap` checked the installed golangci-lint version instead of only
  its presence. The version lived only in `GOLANGCI_LINT_VERSION`, with the
  `go install` module ref derived from it, and any installed version that was
  not the pin was reinstalled. `go install` writes into `GOBIN` (or
  `GOPATH/bin`) while `make lint` ran the first `golangci-lint` on `PATH`, so
  bootstrap re-read the effective version after installing. On a mismatch it
  printed both paths and both versions and exited non-zero; it did not reorder
  `PATH` or delete anyone's binary. The `--version` call kept its stderr and was
  bounded by `timeout(1)` where that exists. `git`, `make` and `go` kept
  presence-only checks. Superseded by
  https://git.eeqj.de/sneak/sfdupes/issues/46: the linter is no longer installed
  on a host (2026-08-09, branch `bootstrap-version-check`,
  https://git.eeqj.de/sneak/sfdupes/issues/24)

- The hash worker pool unwinds on the error path. The pool is an owned,
  context-aware `hashPool`. Every blocking send in the feeder and the workers
  selects on `ctx.Done()`, and `jobs` is closed on every path out. `hashPhase`
  defers `pool.stop()`, which cancels and then drains `results` until the last
  goroutine has exited; draining is what frees a worker parked on a send. `ctx`
  is threaded from `cmd.Context()` through `runScan`, `syncScan`, both worker
  pools and the whole database layer, as the first parameter everywhere. The
  walk pool gets the same treatment, plus a `ctx.Err()` guard after the walk. A
  cancelled walk yields a partial size census, and every file it never reached
  looks vanished to the update phase. The guard is the barrier that still holds
  once an interrupted scan may commit what it has. Tests drive `run(scan)`
  against a database whose insert trigger aborts, and assert that the scan fails
  instead of hanging and that the goroutine count returns to its pre-scan
  baseline. Other tests cancel a scan part-way through the walk and assert that
  it stops at the guard with every record intact (2026-08-09, branch
  `hash-pool-cleanup`, https://git.eeqj.de/sneak/sfdupes/issues/6)

- The database is closed on every fatal exit path. `fatalf` and its `os.Exit(1)`
  are gone, so the deferred `db.Close()`, and with it the SQLite WAL checkpoint,
  runs when a subcommand fails. `runScan`, `runReport`, `runTrees`,
  `loadRecords` and `resolveRoots` return errors instead. The single exit point
  is `run` in `main.go`. It maps a `fatalError` to exit 1 and cobra's own
  argument and flag errors to exit 2, so a runtime failure is never reported as
  a usage error. `main_test.go` drives the CLI in-process and asserts the exit
  codes from README "Error handling" and the stdout/stderr split. That includes
  a fatal error after the database is open leaving no `-wal` or `-shm` file
  behind (2026-08-09, branch `db-close-on-fatal`,
  https://git.eeqj.de/sneak/sfdupes/issues/4)

- golangci-lint updated to v2.12.2 with the canonical config, merged as
  `38a01bd`. The pinned linter in the `Dockerfile` lint stage and
  `script/bootstrap` went from v2.12.1 to v2.12.2, and `.golangci.yml` was
  replaced with the canonical file. The linter settings (`lll`, `funlen`,
  `cyclop`, `dupl` thresholds) now live under `linters.settings`, per the v2
  schema, so they are applied. No new lint findings surfaced (2026-08-09, branch
  `golangci-v2.12.2`, https://git.eeqj.de/sneak/sfdupes/issues/3)

- Makefile targets converted to scripts-to-rule-them-all `script/` entrypoints,
  like the other managed repos. All 12 entrypoints exist, and every Makefile
  target is a thin shim over them (2026-07-26, commit `3abeacf`,
  https://git.eeqj.de/sneak/sfdupes/issues/1)

- The binary is the default Make target: plain `make` builds `sfdupes`, where it
  used to run `check` plus `build`. `make build` remains as an alias
  (2026-07-24, branch `make-default-target`)

- Scan-wide phases, concurrent operands and batched updates. All operands seed
  the shared walk pool, and every pass runs once over the whole scan, so totals
  and ETAs are scan-global. The per-operand walk, hash and update cycles and
  their stderr announcements are gone. The update pass commits in batched
  transactions. The filesystem is authoritative and the database an
  eventually-consistent reflection of it, so scan-level atomicity is not
  required (2026-07-24, branch `scan-wide-phases`)

- The stat pass split back out of the walk. Phases are strictly sequential
  again, walk, stat, hash and update per operand, with parallelism only inside
  each phase. The walk enumerates paths with per-directory workers, and the stat
  pass lstats them with per-file workers, restoring the exact total and ETA of
  the stat bar (2026-07-24, branch `parallel-phases`)

- Each operand is announced on stderr before its passes. With per-operand walk,
  hash and update cycles, a multi-operand run such as `scan /srv/*` showed pass
  totals that looked like the whole run's (2026-07-24, branch
  `scan-operand-progress`)

- Parallel walk. The walk pass was a single goroutine and took hours at about 20
  million files on a busy pool: 22 million files in 4 hours on a ZFS server. It
  is now a per-directory worker-pool traversal that records size and mtime
  during the walk, folding away the separate stat pass and halving metadata I/O.
  Each `PATH` operand commits in its own transaction, so an interrupted scan
  keeps completed operands (2026-07-24, branch `parallel-walk`)

- Persistent scan database. `scan` maintains a SQLite database
  (`modernc.org/sqlite`, pure Go, cgo stays disabled), keyed by absolute path,
  that survives between runs. A rescan hashes only new or changed files, by
  mtime and size. It deletes the records of files vanished from under the
  scanned operands and leaves records outside them untouched, so `scan` can be
  cronned daily. `report` and `trees` read the database, with no positional
  arguments, instead of a scan stream. The database is at
  `/var/lib/sfdupes/db.sqlite`, overridable via `SFDUPES_DATABASE`. WAL
  journaling plus a single-transaction update keep a report run during a scan
  safe (2026-07-24, branch `persistent-database`)

- The `origin` remote (`git@git.eeqj.de:sneak/sfdupes.git`) added, `v0.0.1`
  tagged, and `main` plus tags pushed (2026-07-23)

- `scan` CLI rework. Required `PATH...` operands via cobra replace the `/srv`
  `-root` default. The new `-x`/`--one-file-system` flag (GNU convention) stops
  at filesystem boundaries, which are crossed by default (2026-07-23, branch
  `scan-required-paths`)

- The repo brought into compliance with `REPO_POLICIES.md` (2026-07-06), the
  existing repo checklist and the Go styleguide, audited 2026-07-22 (2026-07-23,
  branch `repo-policy-compliance`). Added or fixed:
    - `.gitignore`, with OS, editor, Go and secrets patterns; the compiled
      `sfdupes` binary and `files.dat` had been sitting untracked in the tree;
    - `.editorconfig`;
    - `LICENSE` (MIT) and the README License section;
    - `REPO_POLICIES.md` in the repo root;
    - the canonical `.golangci.yml`, with the 150 findings it raised fixed;
    - the `Makefile` targets `test`, `lint`, `fmt`, `fmt-check`, `docker` and
      `hooks`, and a `check` target that no longer depends on `build`;
    - a test suite covering parsing, grouping, digests, suppression, hashing and
      the scan pipeline, at 64% coverage;
    - a multistage `Dockerfile` with hash-pinned images, and `.dockerignore`;
    - `.gitea/workflows/check.yml`, running `docker build .` on push with the
      checkout action pinned by commit SHA;
    - the README sections the policy requires;
    - the stale README non-goal "no git repository setup and no CI" removed;
    - the pre-commit hook installed.

- `git init` with a README-only first commit; the code baseline committed on
  `main` (2026-07-22)

- `scan`, `report` and `trees` subcommands implemented (pre-git history)

# Future Steps

- Possible later features, out of scope per README: full-content verification of
  candidates, and helper scripts for removal.

# Accepted Divergences

- Flat single-package layout, with the `.go` files in the repo root. That is
  fine for a small single-binary tool per the Go styleguide, and the tracker
  audit agrees.