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Licenses and third-party material

The diffofdiffs application, build scripts, test runners, documentation, and synthetic examples in samples/ are licensed under the Apache License, Version 2.0, except for the material listed below. The copyright notices in individual files identify their owners. This licensing change applies to the current source; it does not change the licenses of earlier revisions or releases.

Paths in this document and NOTICE refer to the source distribution.

Userspace RCU headers

vendor/urcu/list.h and vendor/urcu/compiler.h retain their LGPL-2.1-or-later license and upstream copyright notices. The complete license is in vendor/urcu/LICENSE. The vendoring notes identify the pinned upstream version and the extracted compiler-header subset.

The application and test programs use struct cds_list_head, the macros CDS_LIST_HEAD, CDS_INIT_LIST_HEAD, cds_list_entry, cds_list_for_each_entry, cds_list_for_each_entry_safe, and caa_container_of, and four inline operations: cds_list_add, cds_list_add_tail, __cds_list_del, and cds_list_del. Each used inline definition is at most eight source lines, and each macro definition is at most six.

The executable contains code compiled from these definitions; no liburcu library or separately compiled liburcu objects are linked. This use relies on the header-use provisions in section 5 of LGPL-2.1, without relicensing the headers themselves. Section 5 also refers to section 6 for executables containing portions of the library. Review that boundary before importing more of liburcu or changing which header implementations the application uses. Installed copies include the LGPL text and vendoring notes under docdir/vendor/urcu/.

HTML colors

The light-theme palette in src/html.css uses values from GitHub Primer Primitives at f48bc063f7bc. That material is MIT-licensed, copyright (c) 2018 GitHub Inc. Its complete notice is in LICENSES/Primer-MIT.txt and the CSS comment embedded in every generated HTML report. The remaining report code is Apache-2.0. Each standalone report also includes the complete Apache license and project NOTICE in an HTML comment, so these stay with distributed copies. Source code quoted by a report retains its own license; the report generator does not change that license.

Formatting configuration

.clang-format derives from Linux at f5bbbfec59b4 and remains GPL-2.0-only. CODING_STYLE.md describes the local formatting changes. The license text is in LICENSES/GPL-2.0.txt. This development configuration is not part of the executable or generated reports.

Test data

Test fixture directories under tests/, excluding tests/support/, contain patch inputs, source excerpts, recorded output, and fixture specifications. The JSON datasets directly under tests/ also contain source excerpts. Project-authored material in these data files remains GPL-2.0-only. Third-party excerpts retain their original licenses, including GPL-2.0-only and GPL-2.0-or-later Linux source. The RXE example in tests/correspondence-trees.json adapts drivers/infiniband/sw/rxe/rxe_srq.c, whose license is GPL-2.0 OR Linux-OpenIB. Small line-number examples in tests/fuzzy1/ and tests/fuzzy2/ also come from patchutils's GPL-2.0-or-later tests/fuzz1/run-test. Existing license identifiers inside a patch or recorded report describe the quoted source, not the test runner.

The GPL version 2 text is in LICENSES/GPL-2.0.txt. Preserve author, commit, copyright, and license information supplied with the fixtures. These datasets are inputs for development checks; they are not compiled into diffofdiffs or installed with it. The programs in tests/support/ and the Python and shell scripts directly under tests/ are Apache-2.0.

Patchutils origins

diffofdiffs grew from interdiff --fuzzy in Sultan Alsawaf's patchutils fork. The Apache migration replaced inherited reader and utility implementations. Some names and short strings still follow patchutils or GNU patch:

  • Legacy interfaces include file_list, add_to_list, stripped, determine_ignore_components, and read_atatline and its parameter names.
  • Header parsing retains the timestamp formats %Y-%m-%d %H:%M:%S, %a %b %e %T %Y, and %b %Y %H:%M:%S accepted by patchutils.
  • The CLI retains the usage: ... [OPTIONS] patch1 patch2 syntax, OPTIONS are:, and only one input file can come from stdin. Reader diagnostics retain unexpected end of file in patch and %s doesn't contain a patch.

The byte-duplication helper also uses the common allocate, copy, append NUL, and return sequence. These remaining correspondences are recorded here for source provenance; the replaced helper bodies are no longer in the application.

Linked dependency: libgit2

diffofdiffs links to the separately installed libgit2 library, relying on its GPLv2 linking exception for use by an application with a different license. The exception does not remove the license obligations for libgit2 itself. A distribution that bundles libgit2 must also satisfy that library's notices and source requirements. libgit2 is not included in this repository.