v4.1.6

The first public release of the 4.1 line — everything since v4.0.3 in one go.

Two changes you will notice: verification now compares content, not just
size (about 35% slower on a verified run; --no-verify opts out), and
reported times got longer because the clock no longer stops before the data
is flushed to the device.

• -q / --quiet — script and cron mode. One line on success
  (OK: copied 12347 files, 4.2 GB in 5.9s), nothing on stdout on failure, the
  reason and FAILED: …, exit N on stderr. OK / FAILED are never
  translated. (#4)

• -p / --progress — quiet mode with the progress bar left on.

• --sftp-only — pure SFTP with no remote exec, for gateways that close the
  exec channel. The GUI gets a per-connection protocol selector.

• Provider presets in creds add for R2, B2, Wasabi, Spaces, Scaleway,
  Hetzner, iDrive, Storj and Oracle.

• Windows onedir builds — the single exe pays a 16–33s cold-start tax on
  Windows; the folder bundle starts instantly.

• Opt-in daily update check, asked once and never in scripts, cron or CI.
  Same setting as a checkbox in the GUI.

• BLITCP_TRACEBACK=1 for the full traceback when you want it.

• Exit codes documented as the contract they already were: 0 ok, 1 corrupt
  or systemic failure, 2 error, 3 only source files skipped.

• Verification re-hashes the destination against the source. Reflinks, hard
  links, sparse copies and the tar-stream modes have no comparable digest and
  are now reported as existence + size rather than counted as fully verified.

• The destination is proven writable before anything is copied, with a real
  write probe — a bad path stops in a second instead of failing deep in the copy.

• Throughput and duration describe the copy that happened. syncfs() before
  the clock stops, rate from allocated bytes, and --quiet reporting the same
  time as the full summary.

• io_uring engine for small files on Linux, 22% faster than the thread pool,
  with automatic fallback.

• Selective dedup pre-hashing — unique-size files are no longer read twice.

• Remote transfers ask about the files being copied, not about the whole
  destination tree: a large remote directory no longer times out the check.

• Faster cross-run dedup — the hash cache is read once and the lookup is
  scoped in SQL instead of per row.

• RAM disks and USB-attached SSDs are no longer treated as spinning disks;
  the seek penalty is measured when the drive's own flag can't be trusted.

• A pip install updates through pip — --check-update asks PyPI and prints
  the right command.

• Better failures: never a bare Error: again, no raw tracebacks in the
  progress output, and files that go missing say why.

• Local copies containing any file under 1 MB copied zero small files — the
  only small-file path Windows and macOS have.

• Cross-run dedup linked outside the destination you asked for, silently
  sharing inodes between unrelated backups. Linking is now scoped to the
  destination; --index-existing widens it back.

• --update on a pip install overwrote site-packages and reverted all six
  translations to English. It now refuses and points at pip. (#4)

• Quiet mode could report OK on a failed run.

• A saved SSH connection's path was replaced by a filename instead of
  extended by it, silently addressing the login directory.

• The relay's symlink sweep could abort the run instead of being reported.

• Cross-run dedup missed --index-existing files, and cache-hit duplicates
  were copied instead of linked.

• The destination flush skipped its fallback on musl and older glibc.

• The seek probe read a warm cache on ntfs3 and called a hard disk flash.

blitcp is free and Apache-2.0 licensed, and stays that way. If it saves you
time: https://ko-fi.com/blitcp — it goes towards the Windows code signing
certificate, hosting for blitcp.dev, and the hardware the benchmarks run on.
Starring the repo or filing a good bug report helps just as much.

Nothing is printed during a normal run: not after a copy, not in --help, not
on first run. Only --version and the GUI's Settings mention it. The URL is a
static string — no redirect, no tracking, no extra network call.