[PATCH v3 10/10] wic: create uniform SBOM describing all image components

["'Felix Moessbauer' via isar-users" <isar-users@googlegroups.com>]

A wic image consists of potentially many different components. All these
should be covered by a single SBOM.

After creating the wic image, we collect the individual sbom files
(rootfs, initrd, imaging) and semantically merge it with the debsbom
tool. The merge SBOM is then deployed as .wic.(spdx|cdx).json next to
the wic image.

Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
---
 meta/classes/imagetypes_wic.bbclass | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/meta/classes/imagetypes_wic.bbclass b/meta/classes/imagetypes_wic.bbclass
index c75d481d..fe31e4e6 100644
--- a/meta/classes/imagetypes_wic.bbclass
+++ b/meta/classes/imagetypes_wic.bbclass
@@ -201,4 +201,29 @@ EOIMAGER
         ${DEPLOY_DIR_IMAGE}/${INITRD_DEPLOY_FILE}.manifest \
         ${WORKDIR}/imager.manifest 2>/dev/null \
         | sort | uniq > "${DEPLOY_DIR_IMAGE}/${IMAGE_FULLNAME}.wic.manifest"
+
+    for bomtype in ${SBOM_TYPES}; do
+        merge_wic_sbom $bomtype
+    done
+}
+
+merge_wic_sbom() {
+    BOMTYPE="$1"
+    TIMESTAMP=$(date --iso-8601=s -d @${SOURCE_DATE_EPOCH})
+    sbom_document_uuid="${@d.getVar('SBOM_DOCUMENT_UUID') or generate_document_uuid(d, False)}"
+
+    cat ${IMAGE_FULLNAME}.${bomtype}.json \
+        ${INITRD_DEPLOY_FILE}.${bomtype}.json \
+        ${WORKDIR}/imager.${bomtype}.json 2>/dev/null | \
+    bwrap \
+        --unshare-user \
+        --unshare-pid \
+        --bind ${SBOM_CHROOT} / \
+        -- debsbom -v merge -t $BOMTYPE \
+            --distro-name '${SBOM_DISTRO_NAME}-Image' --distro-supplier '${SBOM_DISTRO_SUPPLIER}' \
+            --distro-version '${SBOM_DISTRO_VERSION}' --base-distro-vendor '${SBOM_BASE_DISTRO_VENDOR}' \
+            --cdx-serialnumber $sbom_document_uuid \
+            --spdx-namespace '${SBOM_SPDX_NAMESPACE_PREFIX}'-$sbom_document_uuid \
+            --timestamp $TIMESTAMP - -o - \
+     > ${DEPLOY_DIR_IMAGE}/${IMAGE_FULLNAME}.wic.$bomtype.json
 }
-- 
2.51.0

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