Isolate: Use generators instead of seekers

client/isolate/isolate.go

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package isolate
 
 import (
         "bytes"
         "encoding/json"
         "errors"
         "io/ioutil"
         "log"
         "os"
         "path/filepath"
         "regexp"
         "sort"
         "strings"
 
         "github.com/luci/luci-go/client/archiver"
         "github.com/luci/luci-go/client/internal/common"
         "github.com/luci/luci-go/client/internal/tracer"
+        "github.com/luci/luci-go/client/isolatedclient"
         "github.com/luci/luci-go/common/flag/stringmapflag"
         "github.com/luci/luci-go/common/isolated"
 )
 
 // IsolatedGenJSONVersion is used in the batcharchive json format.
 //
 // TODO(tandrii): Migrate to batch_archive.go.
 const IsolatedGenJSONVersion = 1
 
 // ValidVariable is the regexp of valid isolate variable name.
@@ skipping 261 matching lines @@
         sort.Sort(i.Includes)
 
         raw := &bytes.Buffer{}
         if err = json.NewEncoder(raw).Encode(i); err != nil {
                 return nil, err
         }
 
         if err := ioutil.WriteFile(opts.Isolated, raw.Bytes(), 0644); err != nil {
                 return nil, err
         }
-        return arch.Push(displayName, bytes.NewReader(raw.Bytes()), 0), nil
+        return arch.Push(displayName, isolatedclient.NewBytesSource(raw.Bytes()), 0), nil
 }