sys - add IsFileExists

sys/sys.go

@@ -2,6 +2,7 @@ package sys
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"io"
 	"os"
@@ -147,3 +148,11 @@ func IsRunningOnPod() bool {
 	var bufout bytes.Buffer
 	return PipeCmd(exec.Command("cat", "/proc/1/cgroup"), exec.Command("grep", "kubepods"), &bufout) == 0
 }
+
+func IsFileExists(path string) bool {
+	exists := false
+	if _, err := os.Open(path); !errors.Is(err, os.ErrNotExist) {
+		exists = true
+	}
+	return exists
+}