• Prescan: dfsg-author-check found no holder missing from debian/copyright, and the scan listed no built files, minified code, PDFs, fonts or images. The tree has no such files — the whole upstream part is 18 text files: LICENSE, README.md, go.mod, go.sum, 13 .go files under ext4/, log/log.go.
• LICENSE is the canonical Apache-2.0 text with the appendix left as the placeholder Copyright {yyyy} {name of copyright owner}, and contains no additional or restricting clause.
• No upstream file carries a header: grep over the whole tree for Copyright, (C), ©, SPDX-License-Identifier, Licensed under, Permission is hereby granted, GNU, Apache, All rights reserved, public domain matched only LICENSE and debian/copyright. The Files: * / License: Apache-2.0 statement therefore matches the evidence in the files.
• Stanza matching: Files: * reaches every path including below ext4/ and log/ (copyright-format 6.9, * spans /), and the later Files: debian/* overrides it for all nine packaging files (changelog, control, copyright, gbp.conf, rules, salsa-ci.yml, watch, source/format, upstream/metadata), which are attributed to the maintainer.
• Comment is allowed both in a Files stanza and in a stand-alone License stanza (copyright-format 5.2 and 5.3, read with the policy tool), so the file's use of it is conformant.
• The stand-alone License: Apache-2.0 paragraph gives the notice and refers to /usr/share/common-licenses/Apache-2.0; Policy 12.5 (read with the policy tool) says Apache-2.0 packages should refer to that file rather than quote the licence.
• No vendored code: imports in the tree are only github.com/lunixbochs/struc, go.uber.org/zap and golang.org/x/xerrors, each packaged separately in Debian.
• No generated code or missing generator input: no // Code generated, go:generate, go:embed or unsafe marker in the tree, and debian/patches does not exist, so nothing was patched or repacked.
• Packaging files read in full: debian/changelog, control, copyright, rules, gbp.conf, salsa-ci.yml, source/format, upstream/metadata (plus watch for context only, not reviewed).
• Build dependencies resolve in the archive: dh-go 1.69 (installs /usr/share/perl5/Debian/Debhelper/Buildsystem/golang.pm and Sequence/golang.pm, so the --buildsystem=golang / --with=golang in debian/rules have their files, and it Conflicts: dh-golang), dpkg-build-api provided by dpkg-dev 1.23.11, golang-any 2:1.27~1, golang-github-lunixbochs-struc-dev, golang-go.uber-zap-dev 1.27.0-2, golang-golang-x-xerrors-dev.
• The -dev package's three Depends are exactly the three third-party imports; the _test.go files import only bytes, encoding/binary, io, strings and testing, so no test dependency is missing and no build test dependency is needed.
• Standards-Version: 4.7.4 versus the reviewing system's Policy 4.7.4.1: same first two components, so current; not an issue at any severity.
• Architecture split and fields are the Go team's: Architecture: all, Multi-Arch: foreign, Section: golang, XS-Go-Import-Path: github.com/masahiro331/go-ext4-filesystem matching the module path in go.mod; other Go -dev packages in the archive (golang-github-lunixbochs-struc-dev, golang-go.uber-zap-dev, golang-golang-x-xerrors-dev) use the same Multi-Arch value.
• debian/rules is the documented form for this build system (its own POD: configure creates the workspace at the build directory, build runs go install, test runs go test -v, install copies into /usr/share/gocode/src, clean removes the build directory), with debian/_build as an explicit build directory instead of the compat-14 default _build.
• Changelog is well formed: version 0.1.3+git20260423.fe51f5b-1, unstable, urgency medium, trailer with the uploader and a plausible date, and Closes: #1152503. The trailing comma on the Uploaders line of debian/control is normalised away by dpkg — the generated .dsc shows the single uploader with no empty entry — so it has no effect.
• uscan found upstream releases with debian/watch; a newer upstream version is available (upstream 0.1.3+git20261019.81cc551, packaged 0.1.3+git20260423.fe51f5b), which is not a fault of the package.
• Every pointer of debian/copyright to /usr/share/common-licenses names a file that is there (Apache-2.0).

• The nine upstream copyright holders in the Files: * stanza are stated to be the authors of the upstream commits; the source package carries no VCS metadata and no file has a notice, so I could not verify that the list is complete or that the names and years are exact.
• autopkgtest is not installed on the reviewing system (no /usr/share/autopkgtest, no /usr/share/doc/autopkgtest), so I could not read the implementation of the autopkgtest-pkg-go special test suite named in debian/control; the declaration is the one the Debian Go team's other packages use, and dh_golang_autopkgtest (which the package does not use) is only an alternative test command.

None.