pkg/subsystem/linux: add the basic subsystem extraction code

1 files changed, 132 insertions, 0 deletions

diff --git a/pkg/subsystem/linux/subsystems_test.go b/pkg/subsystem/linux/subsystems_test.go
new file mode 100644
index 000000000..f5699f26e
--- /dev/null
+++ b/pkg/subsystem/linux/subsystems_test.go
@@ -0,0 +1,132 @@
+// Copyright 2023 syzkaller project authors. All rights reserved.
+// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+package linux
+
+import (
+	"io/fs"
+	"testing"
+	"testing/fstest"
+
+	"github.com/google/syzkaller/pkg/subsystem/entity"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGroupLinuxSubsystems(t *testing.T) {
+	subsystems, err := listFromRepoInner(
+		prepareTestLinuxRepo(t, []byte(testMaintainers)),
+		nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	// The regexps used for matching rules may change later, so let's not compare them here.
+	for _, s := range subsystems {
+		s.PathRules = nil
+	}
+	expected := []*entity.Subsystem{
+		{
+			Lists:       []string{"linux-fsdevel@vger.kernel.org"},
+			Maintainers: []string{"email_vfs@email.com"},
+		},
+		{
+			Lists:       []string{"linux-ext4@vger.kernel.org"},
+			Maintainers: []string{"email_ext4@email.com", "email_ext4_2@email.com"},
+		},
+		{
+			Lists: []string{"linux-mm@kvack.org"},
+		},
+		{
+			Lists:       []string{"linux-kernel@vger.kernel.org"},
+			Maintainers: []string{"email_rest@email.com"},
+		},
+	}
+	assert.ElementsMatch(t, subsystems, expected)
+}
+
+func prepareTestLinuxRepo(t *testing.T, maintainers []byte) fs.FS {
+	return fstest.MapFS{
+		`fs/ext4/fsync.c`:        {},
+		`fs/ext4/mmp.c`:          {},
+		`fs/freevxfs/vxfs_olt.c`: {},
+		`fs/file.c`:              {},
+		`fs/internal.h`:          {},
+		`include/linux/fs.h`:     {},
+		`include/linux/mm.h`:     {},
+		`include/net/ah.h`:       {},
+		`mm/memory.c`:            {},
+		`mm/shmem.c`:             {},
+		`MAINTAINERS`:            {Data: maintainers},
+	}
+}
+
+var (
+	testMaintainers = `
+Maintainers List
+----------------
+
+.. note:: When reading this list, please look for the most precise areas
+          first. When adding to this list, please keep the entries in
+          alphabetical order.
+
+FILESYSTEMS (VFS and infrastructure)
+M:	Developer <email_vfs@email.com>
+L:	linux-fsdevel@vger.kernel.org
+S:	Maintained
+F:	fs/*
+F:	include/linux/fs.h
+F:	include/linux/fs_types.h
+F:	include/uapi/linux/fs.h
+F:	include/uapi/linux/openat2.h
+
+EXT4 FILE SYSTEM
+M:	Developer <email_ext4@email.com>
+M:	Developer <email_ext4_2@email.com>
+L:	linux-ext4@vger.kernel.org
+S:	Maintained
+W:	http://ext4.wiki.kernel.org
+Q:	http://patchwork.ozlabs.org/project/linux-ext4/list/
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git
+F:	Documentation/filesystems/ext4/
+F:	fs/ext4/
+F:	include/trace/events/ext4.h
+
+FREEVXFS FILESYSTEM
+M:	Developer <email_vxfs@email.com>
+S:	Maintained
+W:	ftp://ftp.openlinux.org/pub/people/hch/vxfs
+F:	fs/freevxfs/
+
+MEMORY MANAGEMENT
+M:	Developer <email_mm@email.com>
+L:	linux-mm@kvack.org
+S:	Maintained
+W:	http://www.linux-mm.org
+T:	git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
+T:	quilt git://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new
+F:	include/linux/gfp.h
+F:	include/linux/gfp_types.h
+F:	include/linux/memory_hotplug.h
+F:	include/linux/mm.h
+F:	include/linux/mmzone.h
+F:	include/linux/pagewalk.h
+F:	include/linux/vmalloc.h
+F:	mm/
+F:	tools/testing/selftests/vm/
+
+TMPFS (SHMEM FILESYSTEM)
+M:	Developer <email_shmem@email.com>
+L:	linux-mm@kvack.org
+S:	Maintained
+F:	include/linux/shmem_fs.h
+F:	mm/shmem.c
+
+THE REST
+M:	Developer <email_rest@email.com>
+L:	linux-kernel@vger.kernel.org
+S:	Buried alive in reporters
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
+F:	*
+F:	*/
+
+`
+)