[OE-core][dunfell][PATCH v2 4/5] create-spdx: Use gzip for compression

[Joshua Watt <jpewhacker@gmail.com>]

The master version of the SPDX classes uses zstd for efficient
compression, but it relies on the zstd tool to be present on the host
system. Since dunfell supports older distros, we don't want to add this
tool as an additional requirement so switch to using gzip instead.

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
---
 meta/classes/create-spdx-2.2.bbclass | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/meta/classes/create-spdx-2.2.bbclass b/meta/classes/create-spdx-2.2.bbclass
index 13d13fe1fc..42b693d586 100644
--- a/meta/classes/create-spdx-2.2.bbclass
+++ b/meta/classes/create-spdx-2.2.bbclass
@@ -466,13 +466,11 @@ python do_create_spdx() {
     @contextmanager
     def optional_tarfile(name, guard, mode="w"):
         import tarfile
-        import bb.compress.zstd
-
-        num_threads = int(d.getVar("BB_NUMBER_THREADS"))
+        import gzip
 
         if guard:
             name.parent.mkdir(parents=True, exist_ok=True)
-            with bb.compress.zstd.open(name, mode=mode + "b", num_threads=num_threads) as f:
+            with gzip.open(name, mode=mode + "b") as f:
                 with tarfile.open(fileobj=f, mode=mode + "|") as tf:
                     yield tf
         else:
@@ -550,7 +548,7 @@ python do_create_spdx() {
     add_download_packages(d, doc, recipe)
 
     if process_sources(d) and include_sources:
-        recipe_archive = deploy_dir_spdx / "recipes" / (doc.name + ".tar.zst")
+        recipe_archive = deploy_dir_spdx / "recipes" / (doc.name + ".tar.gz")
         with optional_tarfile(recipe_archive, archive_sources) as archive:
             spdx_get_src(d)
 
@@ -618,7 +616,7 @@ python do_create_spdx() {
             package_doc.add_relationship(spdx_package, "GENERATED_FROM", "%s:%s" % (recipe_ref.externalDocumentId, recipe.SPDXID))
             package_doc.add_relationship(package_doc, "DESCRIBES", spdx_package)
 
-            package_archive = deploy_dir_spdx / "packages" / (package_doc.name + ".tar.zst")
+            package_archive = deploy_dir_spdx / "packages" / (package_doc.name + ".tar.gz")
             with optional_tarfile(package_archive, archive_packaged) as archive:
                 package_files = add_package_files(
                     d,
@@ -899,8 +897,8 @@ python image_combine_spdx() {
             if link != target_path:
                 link.symlink_to(os.path.relpath(target_path, link.parent))
 
-    spdx_tar_path = imgdeploydir / (image_name + ".spdx.tar.zst")
-    make_image_link(spdx_tar_path, ".spdx.tar.zst")
+    spdx_tar_path = imgdeploydir / (image_name + ".spdx.tar.gz")
+    make_image_link(spdx_tar_path, ".spdx.tar.gz")
 }
 
 python sdk_host_combine_spdx() {
@@ -931,7 +929,7 @@ def combine_spdx(d, rootfs_name, rootfs_deploydir, rootfs_spdxid, packages, spdx
     from datetime import timezone, datetime
     from pathlib import Path
     import tarfile
-    import bb.compress.zstd
+    import gzip
 
     creation_time = datetime.now(tz=timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")
     deploy_dir_spdx = Path(d.getVar("DEPLOY_DIR_SPDX"))
@@ -1002,8 +1000,8 @@ def combine_spdx(d, rootfs_name, rootfs_deploydir, rootfs_spdxid, packages, spdx
 
     index = {"documents": []}
 
-    spdx_tar_path = rootfs_deploydir / (rootfs_name + ".spdx.tar.zst")
-    with bb.compress.zstd.open(spdx_tar_path, "w", num_threads=num_threads) as f:
+    spdx_tar_path = rootfs_deploydir / (rootfs_name + ".spdx.tar.gz")
+    with gzip.open(spdx_tar_path, "w") as f:
         with tarfile.open(fileobj=f, mode="w|") as tar:
             def collect_spdx_document(path):
                 nonlocal tar
-- 
2.33.0