pkg/manager: split off diff fuzzer functionality

Move the code to a separate pkg/manager/diff package. Split the
code into several files.

1 files changed, 0 insertions, 122 deletions

diff --git a/pkg/manager/diff_test.go b/pkg/manager/diff_test.go
deleted file mode 100644
index a73c31ffb..000000000
--- a/pkg/manager/diff_test.go
+++ /dev/null
@@ -1,122 +0,0 @@
-// Copyright 2025 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 manager
-
-import (
-	"fmt"
-	"testing"
-
-	"github.com/google/syzkaller/pkg/mgrconfig"
-	"github.com/google/syzkaller/pkg/osutil"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-)
-
-func TestPatchFocusAreas(t *testing.T) {
-	cfg := &mgrconfig.Config{
-		KernelSrc: t.TempDir(),
-	}
-	require.NoError(t, osutil.FillDirectory(cfg.KernelSrc, map[string]string{
-		"header.h": `Test`,
-		"a.c": `#include <header.h>
-int main(void) { }`,
-		"b.c": `int main(void) { }`,
-		"c.c": `int main(void) { }`,
-	}))
-
-	baseHashes, patchedHashes := dummySymbolHashes(), dummySymbolHashes()
-	baseHashes["function"] = "hash1"
-	patchedHashes["function"] = "hash2"
-
-	PatchFocusAreas(cfg, [][]byte{
-		[]byte(`diff --git a/b.c b/b.c
-index 103167d..fbf7a68 100644
---- a/b.c
-+++ b/b.c
-@@ -1 +1 @@
--int main(void) { }
-\ No newline at end of file
-+int main(void) { return 1; }
-\ No newline at end of file`),
-		// Also, emulate an update to header.h.
-		[]byte(`diff --git a/header.h b/header.h
-index 103167d..fbf7a68 100644
---- a/header.h
-+++ b/header.h
-@@ -1 +1 @@
--Test
-\ No newline at end of file
-+Test2
-\ No newline at end of file`),
-	}, baseHashes, patchedHashes)
-
-	assert.Equal(t, []mgrconfig.FocusArea{
-		{
-			Name: symbolsArea,
-			Filter: mgrconfig.CovFilterCfg{
-				Functions: []string{"^function$"},
-			},
-			Weight: 6.0,
-		},
-		{
-			Name: filesArea,
-			Filter: mgrconfig.CovFilterCfg{
-				Files: []string{"b.c", "header.h"},
-			},
-			Weight: 3.0,
-		},
-		{
-			Name: includesArea,
-			Filter: mgrconfig.CovFilterCfg{
-				Files: []string{"a.c"},
-			},
-			Weight: 2.0,
-		},
-		{
-			Weight: 1.0,
-		},
-	}, cfg.Experimental.FocusAreas)
-}
-
-func dummySymbolHashes() map[string]string {
-	ret := map[string]string{}
-	for i := 0; i < 100; i++ {
-		ret[fmt.Sprint(i)] = fmt.Sprint(i)
-	}
-	return ret
-}
-
-func TestModifiedSymbols(t *testing.T) {
-	t.Run("too many changed", func(t *testing.T) {
-		ret := modifiedSymbols(map[string]string{
-			"functionA": "hash1",
-			"functionB": "hash2",
-		}, map[string]string{
-			"functionA": "hash1",
-			"functionB": "hash is not hash2",
-		})
-		assert.Empty(t, ret)
-	})
-	t.Run("less than threshold", func(t *testing.T) {
-		base, patched := dummySymbolHashes(), dummySymbolHashes()
-		base["function"] = "hash1"
-		patched["function"] = "hash2"
-		base["function2"] = "hash1"
-		patched["function2"] = "hash2"
-		assert.Equal(t, []string{"function", "function2"}, modifiedSymbols(base, patched))
-	})
-}
-
-func TestNeedReproForTitle(t *testing.T) {
-	for title, skip := range map[string]bool{
-		"no output from test machine":                          false,
-		"SYZFAIL: read failed":                                 false,
-		"lost connection to test machine":                      false,
-		"INFO: rcu detected stall in clone":                    false,
-		"WARNING in arch_install_hw_breakpoint":                true,
-		"KASAN: slab-out-of-bounds Write in __bpf_get_stackid": true,
-	} {
-		assert.Equal(t, skip, needReproForTitle(title), "title=%q", title)
-	}
-}