pkg/osutil: add IsExist helper function

2 files changed, 24 insertions, 0 deletions

diff --git a/pkg/osutil/osutil.go b/pkg/osutil/osutil.go
index 3f42dbc12..a9c64ad1c 100644
--- a/pkg/osutil/osutil.go
+++ b/pkg/osutil/osutil.go
@@ -69,3 +69,9 @@ func Abs(path string) string {
 	}
 	return filepath.Join(wd, path)
 }
+
+// IsExist returns true if the file name exists.
+func IsExist(name string) bool {
+	_, err := os.Stat(name)
+	return err == nil || !os.IsNotExist(err)
+}
diff --git a/pkg/osutil/osutil_test.go b/pkg/osutil/osutil_test.go
new file mode 100644
index 000000000..ee4cb6705
--- /dev/null
+++ b/pkg/osutil/osutil_test.go
@@ -0,0 +1,18 @@
+// Copyright 2017 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 osutil
+
+import (
+	"os"
+	"testing"
+)
+
+func TestIsExist(t *testing.T) {
+	if f := os.Args[0]; !IsExist(f) {
+		t.Fatalf("executable %v does not exist", f)
+	}
+	if f := os.Args[0] + "-foo-bar-buz"; IsExist(f) {
+		t.Fatalf("file %v exists", f)
+	}
+}