kitchen: add -python-path

common/flag/stringlistflag/stringlistflag.go

 // Copyright 2016 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
-// Package stringsetflag provides a flag.Value implementation which resolves
-// multiple args into a stringset.
-package stringsetflag
+// Package stringlistflag provides a flag.Value implementation which resolves
+// multiple args into a []string.
+package stringlistflag
 
 import (
         "flag"
         "fmt"
-        "sort"
         "strings"
-
-        "github.com/luci/luci-go/common/stringset"
 )
 
-// Flag is a flag.Value implementation which represents an unordered set of
+// Flag is a flag.Value implementation which represents an ordered set of
 // strings.
 //
 // For example, this allows you to construct a flag that would behave like:
 //   -myflag Foo
 //   -myflag Bar
 //   -myflag Bar
 //
-// And then myflag.Data.Has("Bar") would be true.
-type Flag struct{ Data stringset.Set }
+// And then myflag would be []string{"Foo", "Bar", "Bar"}
+type Flag []string
 
 var _ flag.Value = (*Flag)(nil)
 
 func (f Flag) String() string {
-        if f.Data == nil {
-                return ""
-        }
-        slc := f.Data.ToSlice()
-        sort.Strings(slc)
-        return strings.Join(slc, ",")
+        return strings.Join(f, ", ")
 }
 
 // Set implements flag.Value's Set function.
 func (f *Flag) Set(val string) error {
         if val == "" {
                 return fmt.Errorf("must have an argument value")
         }
 
-        if f.Data == nil {
-                f.Data = stringset.NewFromSlice(val)
-        } else {
-                f.Data.Add(val)
-        }
+        *f = append(*f, val)
         return nil
 }