• debian/copyright read in full: DEP-5, Format field exactly https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/, stanzas Files: * (Expat, 2019 smallnest), Files: pipe_test.go (BSD-3-clause, 2009 The Go Authors), Files: pipe.go (Expat), Files: debian/* (2026 Juan Manuel Méndez Rey, Expat); both stand-alone License paragraphs carry the complete licence texts.
• Complete inventory of upstream files (16 files plus debian/ and .github/): .gitignore, .travis.yml, Circular_Buffer_Animation.gif, LICENSE, Makefile, README.md, example_test.go, go.mod, issue23_test.go, notify_test.go, peekat_test.go, pipe.go, pipe_test.go, readfrom_idle_test.go, ring_buffer.go, ring_buffer_benchmark_test.go, ring_buffer_test.go, .github/workflows/go.yaml. No vendor/, no subdirectories with their own LICENSE/COPYING/NOTICE/AUTHORS, no embedded copies of third-party libraries.
• Grep for Copyright/(C)/©/SPDX/Licensed under/Permission is hereby/GNU/Apache/Mozilla/public domain/All rights reserved across the whole tree (gitignore false, .pc/ and debian/cargo-checksum.json excluded) returns exactly three upstream notices: LICENSE:1 Copyright (c) 2019 smallnest (MIT), ring_buffer.go:1 and pipe.go:1 Copyright 2019 smallnest. All rights reserved. (MIT-style, pointing at the LICENSE file), pipe_test.go:1 Copyright 2009 The Go Authors. All rights reserved. (BSD-style). Every other .go file is headerless, so Files: * is the only stanza that can apply, and it applies correctly; all of this matches debian/copyright (the prescan's author check found no unnamed holder).
• pipe_test.go is the only file from outside upstream: its own header says BSD-style, its pointer to 'the LICENSE file' resolves to smallnest's MIT here, so the packager gave it its own stanza and reproduced Go's BSD-3-clause text. The reproduced text matches Go's licence wording (three conditions, 'Neither the name of Google LLC nor the names of its contributors').
• pipe.go's doc comments and API are those of Go's io.Pipe while its header claims MIT for smallnest; the method bodies are reimplementations over this package's ring buffer, and debian/copyright records the discrepancy in a Comment on Files: pipe.go and says it was reported upstream. The file is matched by the right stanza (the pattern pipe.go has no wildcard, so it names that one path and does not also cover pipe_test.go) and its own notice and the stanza agree on the licence.
• No minified JS/CSS, .jar, .class, .so, .dll, .exe, .pyc, firmware, PDF or generated code without input anywhere in the tree; no .pc/ or Cargo file was read. The only non-text file is Circular_Buffer_Animation.gif (an animation referenced by README.md), reported above.
• debian/control read in full: source golang-github-smallnest-ringbuffer, Section golang, Maintainer/Uploaders as in the .dsc, Build-Depends debhelper-compat (= 14), dh-go, dpkg-build-api (= 1), golang-any, Testsuite autopkgtest-pkg-go, Standards-Version 4.7.4, Vcs-Browser/Vcs-Git on salsa go-team, Homepage equal to the copyright Source, XS-Go-Import-Path github.com/smallnest/ringbuffer (matching the -dev package name and the go.mod module path); one binary, Architecture: all, Multi-Arch: foreign, Depends: ${misc:Depends} only.
• Standards-Version 4.7.4 against the reviewing system's Policy 4.7.4.1: first two components match, so it is current enough and not an issue (policy tool, table of contents).
• Build dependencies checked with the apt-cache tool: dpkg-build-api is a virtual package provided by dpkg-dev 1.23.11 as (= 1), matching dpkg-build-api (= 1); dh-go is 1.69 in the archive, Conflicts: dh-golang, and provides a debhelper sequence addon named golang, a buildsystem module named golang and the commands dh_golang and dh_golang_autopkgtest — so --with=golang in debian/rules resolves, and dh-golang (which Provides: dh-sequence-golang) is correctly not used; golang-any is 2:1.27~1, newer than the go 1.26 directive in go.mod, so the toolchain requirement is satisfiable.
• debian/source/lintian-overrides' single override (missing-build-dependency-for-dh-addon golang) is justified by dh-go's Conflicts: dh-golang and its missing dh-sequence-golang Provides, and the file documents that reasoning; the override is not hiding a real missing dependency.
• At compat 14 dh_gencontrol adds relationship substvars itself (debhelper tool, compat 14), so Depends: ${misc:Depends} alone in the -dev package is correct, not a missing ${shlibs:Depends}.
• Testsuite: autopkgtest-pkg-go with no debian/tests/control is the intended implicit form for Go packages: /usr/bin/dh_golang_autopkgtest on the reviewing system is the script that suite runs ('This script is to be called by autopkgtest'; it rebuilds the package and runs its tests against /usr/share/gocode/src, falling back to the source tree), so no test metadata file is required.
• debian/ read in full: changelog (0.2.0-1, unstable, urgency medium, single entry closing an ITP bug number), control, copyright, gbp.conf (DEP-14, debian/sid, ignore-branch), rules (dh $@ --builddirectory=debian/_build --buildsystem=golang --with=golang and nothing else), salsa-ci.yml, source/format (3.0 (quilt)), source/lintian-overrides, upstream/metadata (Bug-Database/Bug-Submit/Repository/Repository-Browse), watch (not reviewed). No debian/patches/ directory at all, therefore no patch series to review, no maintainer scripts, no *.maintscript, no debian/tests.
• The .dsc beside the tree declares no Files-Excluded and lists only the orig and debian tarballs, so nothing in debian/copyright claims to exclude files that are still in the tree (debian/copyright has no Files-Excluded field either).
• Upstream files that are not Debian's concern were looked at and are ordinary: .travis.yml (stale Go 1.15/1.16 CI with goveralls, carries no licence claim beyond Files: *), .github/workflows/go.yaml (GitHub Actions build/test), .gitignore, Makefile (developer targets, no build-time use), README.md (usage documentation, shipped by dh_installdocs), go.mod (module github.com/smallnest/ringbuffer, go 1.26, no dependencies).
• uscan found the packaged version as the newest upstream release (upstream 0.2.0, packaged 0.2.0).

• The contents and metadata of Circular_Buffer_Animation.gif: binary file, not opened per instructions, so its origin and licence could not be established (see the issue above).
• No build or test run was possible in this read-only review: whether the package actually builds and whether go test passes in the autopkgtest environment were not exercised (nothing in the packaging suggests a failure; the dependencies and toolchain requirements were checked to exist and be new enough).
• Whether upstream has since fixed the pipe.go provenance note or the unresolvable 'LICENSE file' pointer in the Go-derived test file; debian/copyright records the state of 0.2.0.

None.