go-mod-discovery/oe-go-mod-fetcher: add GO_MOD_VCS_EXCLUDE for deleted repos

Some upstream Go module repositories get deleted from GitHub (e.g.,
github.com/vtolstov/go-ioctl). While the Go module proxy still serves
cached archives, VCS mode cannot git clone a deleted repo. This causes
both do_fetch failures and generator verification failures.

Add GO_MOD_VCS_EXCLUDE recipe variable (space-separated module path
prefixes) and corresponding --exclude-module CLI flag. Excluded modules
are filtered out before verification and SRC_URI generation. Recipes
must provide a gomod:// SRC_URI entry for excluded modules as fallback.

Usage in recipe:
  SRC_URI += "gomod://example.com/deleted-repo;version=v1.0.0;sha256sum=..."
  GO_MOD_VCS_EXCLUDE = "example.com/deleted-repo"

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

1 files changed, 20 insertions, 1 deletions

diff --git a/scripts/oe-go-mod-fetcher.py b/scripts/oe-go-mod-fetcher.py
index 5c866928..af8cbb03 100755
--- a/scripts/oe-go-mod-fetcher.py
+++ b/scripts/oe-go-mod-fetcher.py
@@ -2079,6 +2079,7 @@ def _execute(args: argparse.Namespace) -> int:
         debug_limit=debug_limit,
         skip_verify=args.skip_verify,
         verify_jobs=args.verify_jobs,
+        exclude_modules=args.exclude_module,
     )
 
     if success:
@@ -3869,7 +3870,7 @@ def discover_modules(source_dir: Path, gomodcache: Optional[str] = None) -> List
 def generate_recipe(modules: List[Dict], source_dir: Path, output_dir: Optional[Path],
                    git_repo: str, git_ref: str, validate_only: bool = False,
                    debug_limit: Optional[int] = None, skip_verify: bool = False,
-                   verify_jobs: int = 10) -> bool:
+                   verify_jobs: int = 10, exclude_modules: Optional[List[str]] = None) -> bool:
     """
     Phase 2: Recipe Generation
 
@@ -3897,6 +3898,17 @@ def generate_recipe(modules: List[Dict], source_dir: Path, output_dir: Optional[
 
     unresolved_commits: List[Tuple[str, str, str, str, str]] = []
 
+    # Filter out excluded modules (e.g., deleted upstream repos that must use gomod://)
+    if exclude_modules:
+        before_count = len(modules)
+        excluded_prefixes = [e.strip() for e in exclude_modules]
+        modules = [m for m in modules if not any(
+            m.get('module_path', '').startswith(prefix) for prefix in excluded_prefixes
+        )]
+        excluded_count = before_count - len(modules)
+        if excluded_count:
+            print(f"\n⚙️  Excluded {excluded_count} modules matching: {', '.join(excluded_prefixes)}")
+
     total_modules = len(modules)
     if debug_limit is not None:
         print(f"\n⚙️  Debug limit active: validating first {debug_limit} modules (total list size {total_modules})")
@@ -4518,6 +4530,13 @@ Examples:
     )
 
     parser.add_argument(
+        "--exclude-module",
+        metavar="PREFIX",
+        action="append",
+        help="Exclude modules matching PREFIX from git:// generation (use gomod:// in recipe instead)"
+    )
+
+    parser.add_argument(
         "--version",
         action="version",
         version=f"%(prog)s {VERSION}"