[PATCH v2 17/18] spdx-common: Add documentation for undocumented SPDX variables

[Stefano Tondo <stondo@gmail.com>]

From: Stefano Tondo <stefano.tondo.ext@siemens.com>

Add [doc] strings for eight undocumented SPDX-related BitBake
variables in spdx-common.bbclass.

Variables documented:
- SPDX_INCLUDE_SOURCES
- SPDX_INCLUDE_COMPILED_SOURCES
- SPDX_UUID_NAMESPACE
- SPDX_NAMESPACE_PREFIX
- SPDX_PRETTY
- SPDX_LICENSES
- SPDX_CUSTOM_ANNOTATION_VARS
- SPDX_MULTILIB_SSTATE_ARCHS

This makes variables discoverable via bitbake-getvar and IDE
completion, improving usability for SBOM generation.

Signed-off-by: Stefano Tondo <stefano.tondo.ext@siemens.com>
---
 meta/classes/spdx-common.bbclass | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/meta/classes/spdx-common.bbclass b/meta/classes/spdx-common.bbclass
index 99f0704caf..3d13650962 100644
--- a/meta/classes/spdx-common.bbclass
+++ b/meta/classes/spdx-common.bbclass
@@ -26,15 +26,38 @@ SPDX_TOOL_VERSION ??= "1.0"
 SPDXRUNTIMEDEPLOY = "${SPDXDIR}/runtime-deploy"
 
 SPDX_INCLUDE_SOURCES ??= "0"
+SPDX_INCLUDE_SOURCES[doc] = "If set to '1', include source code files in the \
+    SPDX output. This will create File objects for all source files used during \
+    the build. Note: This significantly increases SBOM size and generation time."
+
 SPDX_INCLUDE_COMPILED_SOURCES ??= "0"
+SPDX_INCLUDE_COMPILED_SOURCES[doc] = "If set to '1', include compiled source \
+    files (object files, etc.) in the SPDX output. This automatically enables \
+    SPDX_INCLUDE_SOURCES. Note: This significantly increases SBOM size."
 
 SPDX_UUID_NAMESPACE ??= "sbom.openembedded.org"
+SPDX_UUID_NAMESPACE[doc] = "The namespace used for generating UUIDs in SPDX \
+    documents. This should be a domain name or unique identifier for your \
+    organization to ensure globally unique SPDX IDs."
+
 SPDX_NAMESPACE_PREFIX ??= "http://spdx.org/spdxdocs"
+SPDX_NAMESPACE_PREFIX[doc] = "The URI prefix used for SPDX document namespaces. \
+    Combined with other identifiers to create unique document URIs."
+
 SPDX_PRETTY ??= "0"
+SPDX_PRETTY[doc] = "If set to '1', generate human-readable formatted JSON output \
+    with indentation and line breaks. If '0', generate compact JSON output. \
+    Pretty formatting makes files larger but easier to read."
 
 SPDX_LICENSES ??= "${COREBASE}/meta/files/spdx-licenses.json"
+SPDX_LICENSES[doc] = "Path to the JSON file containing SPDX license identifier \
+    mappings. This file maps common license names to official SPDX license \
+    identifiers."
 
 SPDX_CUSTOM_ANNOTATION_VARS ??= ""
+SPDX_CUSTOM_ANNOTATION_VARS[doc] = "Space-separated list of variable names whose \
+    values will be added as custom annotations to SPDX documents. Each variable's \
+    name and value will be recorded as an annotation for traceability."
 
 SPDX_CONCLUDED_LICENSE ??= ""
 SPDX_CONCLUDED_LICENSE[doc] = "The license concluded by manual or external \
@@ -66,6 +89,9 @@ SPDX_FORCE_RUNTIME_SCOPE[doc] = "Space-separated list of recipe names to force \
     into runtime scope, overriding automatic dependency classification."
 
 SPDX_MULTILIB_SSTATE_ARCHS ??= "${SSTATE_ARCHS}"
+SPDX_MULTILIB_SSTATE_ARCHS[doc] = "The list of sstate architectures to consider \
+    when collecting SPDX dependencies. This includes multilib architectures when \
+    multilib is enabled. Defaults to SSTATE_ARCHS."
 
 SPDX_FILES_INCLUDED ??= "all"
 SPDX_FILES_INCLUDED[doc] = "Controls which files are included in SPDX output. \
-- 
2.53.0