// Copyright (C) 2024 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only

/*!
\page sbom.html
\title Software Bill of Materials
\brief Qt package information in SPDX format
\ingroup licensing

A Software Bill of Materials (SBOM) document is a declaration of installed
files, copyrights, licenses, versions, source repositories, and other relevant
information about a Qt installation. The SBOM documents facilitate supply chain
management by sharing component information to Qt users and other interested
parties. Qt's SBOM documents are especially useful for license compliance and
security vulnerability management.

Starting from Qt 6.8, Qt's build system can generate SBOM documents tailored
for different platforms and build configurations.
The \l{Using Qt Online Installer}{Qt Online Installer} places the SBOM
documents in an \c{sbom} directory located in the installation directory of the
respective Qt version.
For example, for the Qt \QtVersion Android arm64-v8a installation, the SBOM
documents are at:
\badcode \QtVersion
<INSTALL_DIR>/\1/android_arm64_v8a/sbom/
\endcode

To generate SBOM documents from the Qt sources yourself, set \c -sbom as a
\l{Qt Configure Options}{configure} option.

For example, during the configure step:
\badcode
./configure  -sbom
\endcode
Generation of SBOM documents then becomes a part of the regular Qt installation:
\badcode
ninja install
cmake --install .
\endcode

This build process creates SBOM documents in JSON and \c{tag:value}
format as specified by the \l{SPDX Format}{SPDX} format.

See \l{Building Qt Sources} and \l{Qt Configure Options} for more information
about the Qt build procedure.

For Qt developers and maintainers, the \l{https://wiki.qt.io/SBOM}{SBOM Wiki}
has specific information for creating SBOM documents.

\section1 REUSE-compliant Qt modules

\l{All Modules}{Qt modules} are \l REUSE compliant starting from Qt 6.9.
Specifically, license documentation and license checks are part of Qt's
development process. Various tools check Qt repositories for licenses in files
or externally in REUSE.toml files.

The \l{reuse-tool} checks for REUSE compliance and generates source SBOMs. An
internal tool checks that the generated source SBOM files comply with the Qt
license specification.

For more information about licenses documentation in the Qt sources, visit the
following:
\list
\li \l{QUIP 18: License specification in Qt's modules}
\li \l{Licensing in Qt sources}
\endlist

\section1 SPDX Format

The SBOM documents are in \l{https://spdx.github.io/spdx-spec/v2.3}{SPDX 2.3}
format. A document begins with information about the Qt module. SPDX packages
follow as separate entries.

For a Qt installation, an SPDX package may be a:
\list
\li \l{All Modules}{Qt module}
\li Qt plugin - for example, \l{Supported Platforms}{platform} plugins
\li Qt tool - for example, \l{Using the Meta-Object Compiler (moc)}{moc}
\li Qt application - for example, \l{Qt Widgets Designer}
\li Third-party component - see \l{Third-Party Code Used in Qt}
\li System library dependency - \l{Qt Configure Options}
\endlist

An SPDX package typically contains at least:

\list
\li Package name, version, supplier name, and build information
\li Qt License Attribution - a Qt product may be under different commercial or
    open source licenses. For example, a package may list several concluded
    licenses:
    \badcode
    LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
    \endcode
    The \l{Qt Licensing} has more information about licensing options.
\li Copyright notices - SBOM documents include Qt source copyrights and
    copyrights from third-party sources or authors.
\li CPE (Common Platform Enumeration) - a naming scheme for package
    identification. For Qt, the SBOM CPE format is typically:
    \badcode
    cpe:<cpe_version>:<part>:<vendor>:<product>:<version>:<update>:<edition>:<language>:<sw_edition>:<target_sw>:<target_hw>:<other>
    \endcode

    An example identifier for a \l{Qt Network Authorization} package is:
    \badcode \QtVersion
    cpe:2.3:a:qt:qtnetworkauth:\1:*:*:*:*:*:*:*
    \endcode
    For more information, see
    \l{https://cpe.mitre.org/specification/}{CPE Specification} page.
\li PURL (Package URL) - an alternative to CPE, PURL is an identifier scheme
    that uses the following format:
    \badcode
    scheme:type/namespace/name@version?qualifiers#subpath
    \endcode

    An example PURL for a package is:
    \badcode \QtVersion
    pkg:generic/TheQtCompany/qtnetworkauth@\1
    \endcode
    For more information,
    \l{https://github.com/package-url/purl-spec}{Package URL} page.
\li Package relationships between packages such as dependencies.

    For example, the \c DEPENDS_ON for listing a dependency relationship.
    Refer to Clause 11 of the
    \l{https://spdx.github.io/spdx-spec/v2.3/relationships-between-SPDX-elements/}{SPDX 2.3}
     for a list of valid
    relationship types.

\endlist

\section1 Third-party SPDX Packages

An SPDX package for a third-party component typically contains at least:

\list
\li Name, version, and description
\li Homepage and download location
\li Usage in Qt
\li License and copyright information
\li Whether the component is security critical - the code may process untrusted
code
\endlist

\section1 SBOM Example

The following is an example of an SBOM document for the
\l{Qt Network Authorization} module. The SBOM filename is
\c qtnetworkauth-6.9.0.spdx and is in the installation's \c sbom directory.
Note that the SBOM document contains several other packages not listed in the
following example.

\code
SPDXVersion: SPDX-2.3
DataLicense: CC0-1.0
SPDXID: SPDXRef-DOCUMENT
DocumentName: qtnetworkauth-6.9.0
DocumentNamespace: https://qt.io/spdxdocs/qtnetworkauth-6.9.0
Creator: Organization: TheQtCompany
Creator: Tool: Qt Build System
CreatorComment: <text>This SPDX document was created from CMake 3.27.7, using the qt
build system from https://code.qt.io/cgit/qt/qtbase.git/tree/cmake/QtPublicSbomHelpers.cmake</text>
Created: 2024-09-19T11:07:23Z
ExternalDocumentRef: DocumentRef-qtbase https://qt.io/spdxdocs/qtbase-6.9.0 SHA1: 3dbc51259a07d458524a976da2e9607a76fab7e7

PackageName: NetworkAuth
SPDXID: SPDXRef-Package-qtnetworkauth-qt-module-NetworkAuth
PackageDownloadLocation: git://code.qt.io/qt/qtnetworkauth.git
PackageVersion: 6.9.0
PackageSupplier: Organization: TheQtCompany
PackageLicenseConcluded: LicenseRef-Qt-Commercial OR GPL-3.0-only
PackageLicenseDeclared: LicenseRef-Qt-Commercial OR GPL-3.0-only
ExternalRef: PACKAGE-MANAGER purl pkg:github/qt/qtnetworkauth?library_name=NetworkAuth#src/oauth
ExternalRef: PACKAGE-MANAGER purl pkg:generic/TheQtCompany/qtnetworkauth-NetworkAuth?vcs_url=https://code.qt.io/qt/qtnetworkauth.git&library_name=NetworkAuth#src/oauth
FilesAnalyzed: true
PackageCopyrightText: <text>Copyright (C) 2024 The Qt Company Ltd.</text>
PrimaryPackagePurpose: LIBRARY
ExternalRef: SECURITY cpe23Type cpe:2.3:a:qt:qtnetworkauth:6.9.0:*:*:*:*:*:*:*
ExternalRef: SECURITY cpe23Type cpe:2.3:a:qt:qt:6.9.0:*:*:*:*:*:*:*
Relationship: SPDXRef-Package-qtnetworkauth-qt-module-NetworkAuth DEPENDS_ON DocumentRef-qtbase:SPDXRef-Package-qtbase-qt-module-Core
Relationship: SPDXRef-Package-qtnetworkauth-qt-module-NetworkAuth DEPENDS_ON DocumentRef-qtbase:SPDXRef-Package-qtbase-qt-module-PlatformModuleInternal
Relationship: SPDXRef-Package-qtnetworkauth-qt-module-NetworkAuth DEPENDS_ON DocumentRef-qtbase:SPDXRef-Package-qtbase-qt-module-Gui
Relationship: SPDXRef-Package-qtnetworkauth-qt-module-NetworkAuth DEPENDS_ON DocumentRef-qtbase:SPDXRef-Package-qtbase-qt-module-Network
Relationship: SPDXRef-Package-qtnetworkauth CONTAINS SPDXRef-Package-qtnetworkauth-qt-module-NetworkAuth
\endcode

\section1 Yocto builds with meta-qt6

\l{Boot to Qt} uses the meta-qt6 layer to build all Qt modules and the
generated SBOM documents are available as SPDX files when installing Boot to Qt
through the \l{Using Qt Online Installer}{Qt Online Installer}.
The install path depends on the Qt version and the target hardware.

For example, for the Raspberry Pi target, the SBOM .spdx
documents are at:
\badcode \QtVersion
<INSTALL_DIR>/\1/Boot2Qt/raspberrypi-armv8/toolchain/sysroots/cortexa53-poky-linux/usr/lib/sbom/
\endcode

For more information, visit the following pages:
\list
\li \l{Boot to Qt: Using meta-qt6}{Using meta-qt6}
\li \l{meta-qt6 repository}
\endlist

\section1 Related Topics

\list
\li \l{https://spdx.github.io/spdx-spec/v2.3/}{SPDX 2.3}
\li \l{https://wiki.qt.io/SBOM}{Qt Wiki - SBOM} - generating SBOM documents from Qt sources
\li \l{Third-Party Code Used in Qt}
\endlist
*/
