Include replaces field into chk_adrs.py

Standards/scs-0210-v2-k8s-version-policy.md

@@ -4,6 +4,7 @@ type: Standard
 stabilized_at: 2024-02-08
 status: Stable
 track: KaaS
+replaces: scs-0210-v1-k8s-new-version-policy.md
 ---
 
 ## Introduction

Tests/chk_adrs.py

@@ -131,6 +131,18 @@ def check_front_matter(self, fn, front, filenames):
         ]
         if errors:
             self.emit(f"in {fn}: syntax errors with key(s) {', '.join(errors)}")
+        # special check for replaces field if major version > 1
+        if fn[9:12] not in ("vN-", "v1-"):
+            replaces = front.get("replaces")
+            if replaces is None:
+                self.emit(f"in {fn}: missing replaces field")
+            else:
+                if isinstance(replaces, str):
+                    print(f"WARNING: in {fn}: replaces field not a list", file=sys.stderr)
+                    replaces = [replaces]
+                missing = [fn for fn in replaces if fn not in filenames]
+                if missing:
+                    self.emit(f"in {fn}: original version(s) {','.join(missing)} not found")
         # now do cross-field checks
         status = front.get("status")
         if "replaced_by" in front and status not in ("Deprecated", "Rejected"):