From c507dcb8a8780a42bfe68b1ebaff0909b4236e6b Mon Sep 17 00:00:00 2001
From: Daniel Turull <daniel.turull@ericsson.com>
Date: Tue, 10 Jun 2025 17:24:41 +0200
Subject: [PATCH] package: export debugsources in PKGDESTWORK as json

The source information used during packaging can be use from other tasks to
have more detailed information on the files used during the compilation and
improve SPDX accuracy.

Source files used during compilation are store as compressed zstd json in
pkgdata/debugsources/$PN-debugsources.json.zstd
Format:
{ binary1: [src1, src2, ...], binary2: [src1, src2, ...] }

I checked the sstate size, and it slightly increases using core-image-full-cmdline:
without patch: 2456792 KB sstate-cache/
with patch:    2460028 KB sstate-cache/
(4236 KB or 0.17%)

CC: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Daniel Turull <daniel.turull@ericsson.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
 meta/conf/bitbake.conf |  2 ++
 meta/lib/oe/package.py | 46 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+)

diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
index c515a07b6f4..e600d9d774a 100644
--- a/meta/conf/bitbake.conf
+++ b/meta/conf/bitbake.conf
@@ -991,5 +991,7 @@ oe.sstatesig.find_sstate_manifest[vardepsexclude] = "BBEXTENDCURR BBEXTENDVARIAN
 oe.utils.get_multilib_datastore[vardepsexclude] = "DEFAULTTUNE_MULTILIB_ORIGINAL OVERRIDES"
 oe.path.format_display[vardepsexclude] = "TOPDIR"
 oe.utils.get_bb_number_threads[vardepsexclude] = "BB_NUMBER_THREADS"
+oe.package.save_debugsources_info[vardepsexclude] = "BB_NUMBER_THREADS"
+oe.package.read_debugsources_info[vardepsexclude] = "BB_NUMBER_THREADS"
 oe.packagedata.emit_pkgdata[vardepsexclude] = "BB_NUMBER_THREADS"
 oe.packagedata.read_subpkgdata_extended[vardepsexclude] = "BB_NUMBER_THREADS"
diff --git a/meta/lib/oe/package.py b/meta/lib/oe/package.py
index 0bcc04ea54a..60392cbcedb 100644
--- a/meta/lib/oe/package.py
+++ b/meta/lib/oe/package.py
@@ -1049,6 +1049,49 @@ def copydebugsources(debugsrcdir, sources, d):
             if os.path.exists(p) and not os.listdir(p):
                 os.rmdir(p)
 
+def save_debugsources_info(debugsrcdir, sources_raw, d):
+    import json
+    import bb.compress.zstd
+    if debugsrcdir and sources_raw:
+        debugsources_file = d.expand("${PKGDESTWORK}/debugsources/${PN}-debugsources.json.zstd")
+        debugsources_dir = os.path.dirname(debugsources_file)
+        if not os.path.isdir(debugsources_dir):
+            bb.utils.mkdirhier(debugsources_dir)
+        bb.utils.remove(debugsources_file)
+
+        workdir = d.getVar("WORKDIR")
+        pn = d.getVar('PN')
+
+        # Kernel sources are in a different directory and are special case
+        # we format the sources as expected by spdx by replacing /usr/src/kernel/
+        # into BP/
+        kernel_src = d.getVar('KERNEL_SRC_PATH')
+        bp = d.getVar('BP')
+        sources_dict = {}
+        for file, src_files in sources_raw:
+            file_clean = file.replace(f"{workdir}/package/","")
+            sources_clean = [
+                src.replace(f"{debugsrcdir}/{pn}/", "")
+                if not kernel_src else src.replace(f"{kernel_src}/", f"{bp}/")
+                for src in src_files
+                if not any(keyword in src for keyword in ("<internal>", "<built-in>")) and not src.endswith("/")
+            ]
+            sources_dict[file_clean] = sorted(sources_clean)
+        num_threads = int(d.getVar("BB_NUMBER_THREADS"))
+        with bb.compress.zstd.open(debugsources_file, "wt", encoding="utf-8", num_threads=num_threads) as f:
+            json.dump(sources_dict, f, sort_keys=True)
+
+def read_debugsources_info(d):
+    import json
+    import bb.compress.zstd
+    try:
+        fn = d.expand("${PKGDESTWORK}/debugsources/${PN}-debugsources.json.zstd")
+        num_threads = int(d.getVar("BB_NUMBER_THREADS"))
+        with bb.compress.zstd.open(fn, "rt", encoding="utf-8", num_threads=num_threads) as f:
+            return json.load(f)
+    except FileNotFoundError:
+        bb.debug(1, f"File not found: {fn}")
+        return None
 
 def process_split_and_strip_files(d):
     cpath = oe.cachedpath.CachedPath()
@@ -1280,6 +1323,9 @@ def process_split_and_strip_files(d):
         # Process the dv["srcdir"] if requested...
         # This copies and places the referenced sources for later debugging...
         copydebugsources(dv["srcdir"], sources, d)
+
+        # Save source info to be accessible to other tasks
+        save_debugsources_info(dv["srcdir"], results, d)
     #
     # End of debug splitting
     #
-- 
2.47.3