pkg/bisect: add test for #1527

Update #1527

1 files changed, 123 insertions, 0 deletions

diff --git a/pkg/vcs/git_test_util.go b/pkg/vcs/git_test_util.go
new file mode 100644
index 000000000..86713bac0
--- /dev/null
+++ b/pkg/vcs/git_test_util.go
@@ -0,0 +1,123 @@
+package vcs
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/google/syzkaller/pkg/osutil"
+)
+
+const (
+	userEmail           = `test@syzkaller.com`
+	userName            = `Test Syzkaller`
+	extractFixTagsEmail = `"syzbot" <syzbot@my.mail.com>`
+)
+
+type TestRepo struct {
+	t       *testing.T
+	Dir     string
+	name    string
+	Commits map[string]map[string]*Commit
+	repo    *git
+}
+
+func (repo *TestRepo) Git(args ...string) {
+	if _, err := osutil.RunCmd(time.Minute, repo.Dir, "git", args...); err != nil {
+		repo.t.Fatal(err)
+	}
+}
+
+func MakeTestRepo(t *testing.T, dir string) *TestRepo {
+	if err := osutil.MkdirAll(dir); err != nil {
+		t.Fatal(err)
+	}
+	ignoreCC := map[string]bool{
+		"stable@vger.kernel.org": true,
+	}
+	repo := &TestRepo{
+		t:       t,
+		Dir:     dir,
+		name:    filepath.Base(dir),
+		Commits: make(map[string]map[string]*Commit),
+		repo:    newGit(dir, ignoreCC),
+	}
+	repo.Git("init")
+	repo.Git("config", "--add", "user.email", userEmail)
+	repo.Git("config", "--add", "user.name", userName)
+	return repo
+}
+
+func (repo *TestRepo) CommitFileChange(branch, change string) {
+	id := fmt.Sprintf("%v-%v-%v", repo.name, branch, change)
+	file := filepath.Join(repo.Dir, "file")
+	if err := osutil.WriteFile(file, []byte(id)); err != nil {
+		repo.t.Fatal(err)
+	}
+	repo.Git("add", file)
+	repo.Git("commit", "-m", id)
+	if repo.Commits[branch] == nil {
+		repo.Commits[branch] = make(map[string]*Commit)
+	}
+	com, err := repo.repo.HeadCommit()
+	if err != nil {
+		repo.t.Fatal(err)
+	}
+	repo.Commits[branch][change] = com
+}
+
+func (repo *TestRepo) CommitChange(description string) *Commit {
+	repo.Git("commit", "--allow-empty", "-m", description)
+	com, err := repo.repo.HeadCommit()
+	if err != nil {
+		repo.t.Fatal(err)
+	}
+	return com
+}
+
+func (repo *TestRepo) SetTag(tag string) {
+	repo.Git("tag", tag)
+}
+
+func (repo *TestRepo) SupportsBisection() bool {
+	// Detect too old git binary. --no-contains appeared in git 2.13.
+	_, err := repo.repo.previousReleaseTags("HEAD", true)
+	return err == nil ||
+		!strings.Contains(err.Error(), "usage: git tag") &&
+			!strings.Contains(err.Error(), "error: unknown option")
+}
+
+func CreateTestRepo(t *testing.T, baseDir, name string) *TestRepo {
+	repo := MakeTestRepo(t, filepath.Join(baseDir, name))
+	repo.Git("checkout", "-b", "master")
+	repo.CommitFileChange("master", "0")
+	for _, branch := range []string{"branch1", "branch2"} {
+		repo.Git("checkout", "-b", branch, "master")
+		repo.CommitFileChange(branch, "0")
+		repo.CommitFileChange(branch, "1")
+	}
+	repo.Git("checkout", "master")
+	repo.CommitFileChange("master", "1")
+	return repo
+}
+
+func CloneTestRepo(t *testing.T, baseDir string, name string, originRepo *TestRepo) *TestRepo {
+	dir := filepath.Join(baseDir, name)
+	if err := osutil.MkdirAll(dir); err != nil {
+		t.Fatal(err)
+	}
+	ignoreCC := map[string]bool{
+		"stable@vger.kernel.org": true,
+	}
+	repo := &TestRepo{
+		t:       t,
+		Dir:     dir,
+		name:    filepath.Base(dir),
+		Commits: make(map[string]map[string]*Commit),
+		repo:    newGit(dir, ignoreCC),
+	}
+	repo.Git("clone", originRepo.Dir, repo.Dir)
+	return repo
+}