pkg/subsystem: do not reuse customly grouped records

If a record was specified in a custom subsystem list, do not consider it
while grouping records by mailing list.

2 files changed, 29 insertions, 8 deletions

diff --git a/pkg/subsystem/linux/subsystems.go b/pkg/subsystem/linux/subsystems.go
index 1d1d84ed2..38473c901 100644
--- a/pkg/subsystem/linux/subsystems.go
+++ b/pkg/subsystem/linux/subsystems.go
@@ -29,12 +29,11 @@ func listFromRepoInner(root fs.FS, rules *customRules) ([]*subsystem.Subsystem,
 		rawRecords: records,
 		extraRules: rules,
 	}
-	list := ctx.groupByList()
 	extraList, err := ctx.groupByRules()
 	if err != nil {
 		return nil, err
 	}
-	list = append(list, extraList...)
+	list := append(ctx.groupByList(), extraList...)
 	matrix, err := BuildCoincidenceMatrix(root, list, dropPatterns)
 	if err != nil {
 		return nil, err
@@ -108,19 +107,31 @@ func (ctx *linuxCtx) groupByRules() ([]*subsystem.Subsystem, error) {
 	for _, item := range ctx.rawRecords {
 		perName[item.name] = item
 	}
-	ret := []*subsystem.Subsystem{}
+	var ret []*subsystem.Subsystem
+	exclude := map[*maintainersRecord]struct{}{}
 	for name, recordNames := range ctx.extraRules.extraSubsystems {
 		matching := []*maintainersRecord{}
 		for _, recordName := range recordNames {
-			if perName[recordName] == nil {
+			record := perName[recordName]
+			if record == nil {
 				return nil, fmt.Errorf("MAINTAINERS record not found: %#v", recordName)
 			}
-			matching = append(matching, perName[recordName])
+			exclude[record] = struct{}{}
+			matching = append(matching, record)
 		}
 		s := mergeRawRecords(matching, "")
 		s.Name = name
 		ret = append(ret, s)
 	}
+	// Exclude rawRecords from further consideration.
+	var newRecords []*maintainersRecord
+	for _, record := range ctx.rawRecords {
+		if _, ok := exclude[record]; ok {
+			continue
+		}
+		newRecords = append(newRecords, record)
+	}
+	ctx.rawRecords = newRecords
 	return ret, nil
 }
 
diff --git a/pkg/subsystem/linux/subsystems_test.go b/pkg/subsystem/linux/subsystems_test.go
index f60f6d70f..7e6869161 100644
--- a/pkg/subsystem/linux/subsystems_test.go
+++ b/pkg/subsystem/linux/subsystems_test.go
@@ -27,9 +27,10 @@ func TestGroupLinuxSubsystems(t *testing.T) {
 	}
 	expected := []*subsystem.Subsystem{
 		{
-			Name:        "fs",
-			Lists:       []string{"linux-fsdevel@vger.kernel.org"},
-			Maintainers: []string{"email_vfs@email.com"},
+			Name:  "fs",
+			Lists: []string{"linux-fsdevel@vger.kernel.org"},
+			// Two different subsystems point to linux-fsdevel@vger.kernel.org, so
+			// we do not include maintainers.
 		},
 		{
 			Name:        "ext4",
@@ -73,7 +74,15 @@ func TestCustomCallRules(t *testing.T) {
 	assert.Contains(t, subsystems, &subsystem.Subsystem{
 		Name:        "udf",
 		Maintainers: []string{"email_udf@email.com"},
+		Lists:       []string{"linux-fsdevel@vger.kernel.org"},
 	})
+	// Now that udf is excluded, it becomes possible to generate a maintainer list for vfs.
+	assert.Contains(t, subsystems, &subsystem.Subsystem{
+		Name:        "fs",
+		Lists:       []string{"linux-fsdevel@vger.kernel.org"},
+		Maintainers: []string{"email_vfs@email.com"},
+	})
+
 	expectCalls := map[string][]string{
 		"ext4":  {"syz_mount_image$ext4"},
 		"tmpfs": {"syz_mount_image$tmpfs"},
@@ -275,6 +284,7 @@ F:	mm/shmem*
 
 UDF FILESYSTEM
 M:	email_udf <email_udf@email.com>
+L:	linux-fsdevel@vger.kernel.org
 S:	Maintained
 F:	Documentation/filesystems/udf.rst
 F:	fs/udf/