Kitchen: Generate LogDog prefix from Swarming.

go/src/infra/tools/kitchen/cook.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 main
 
 import (
         "encoding/json"
         "fmt"
         "io/ioutil"
@@ skipping 68 matching lines @@
                         "The name of the LogDog host.")
                 fs.StringVar(
                         &c.logdog.project,
                         "logdog-project",
                         "",
                         "The name of the LogDog project to log into. Projects have different ACL sets, "+
                                 "so choose this appropriately.")
                 fs.Var(
                         &c.logdog.prefix,
                         "logdog-prefix",
-                        "The LogDog stream Prefix to use.")
+                        "The LogDog stream Prefix to use. If empty, one will be constructed from the Swarming "+
+                                "task parameters.")

[nodir, 2016/07/14 22:25:48]

please explain here where these parameter values are taken from (env var names)

[dnj (Google), 2016/07/14 22:37:38]

Done.

                 fs.BoolVar(
                         &c.logdog.annotee,
                         "logdog-enable-annotee",
                         true,
                         "Process bootstrap STDOUT/STDERR annotations through Annotee.")
                 fs.StringVar(
                         &c.logdog.filePath,
                         "logdog-debug-out-file",
                         "",
                         "If specified, write all generated logs to this path instead of sending them.")
@@ skipping 222 matching lines @@
 }
 
 func annotateTime(ctx context.Context) {
         timestamp := clock.Get(ctx).Now().Unix()
         annotate("CURRENT_TIMESTAMP", strconv.FormatInt(timestamp, 10))
 }
 
 func annotate(args ...string) {
         fmt.Printf("@@@%s@@@\n", strings.Join(args, "@"))
 }