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command.go
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command.go
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// Copyright (c) 2018 The Jaeger Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package env
import (
"fmt"
"strings"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"github.com/jaegertracing/jaeger/plugin/storage"
)
// Command creates `env` command
func Command() *cobra.Command {
return &cobra.Command{
Use: "env",
Short: "Help about environment variables",
Long: `Help about environment variables`,
Run: func(cmd *cobra.Command, args []string) {
fmt.Fprintln(cmd.OutOrStdout(), `
All command line options can be provided via environment variables by converting
their names to upper case and replacing punctuation with underscores. For example,
command line option environment variable
------------------------------------------------------------------
--cassandra.connections-per-host CASSANDRA_CONNECTIONS_PER_HOST
--metrics-backend METRICS_BACKEND
The following configuration options are only available via environment variables:`+"\n")
fs := new(pflag.FlagSet)
fs.String(storage.SpanStorageTypeEnvVar, "cassandra", `The type of backend (cassandra, elasticsearch, kafka, memory) used for trace storage. Multiple backends can be specified (currently only for writing spans) as comma-separated list, e.g. "cassandra,kafka".`)
fs.String(storage.DependencyStorageTypeEnvVar, "${SPAN_STORAGE}", "The type of backend used for service dependencies storage.")
fmt.Fprintln(cmd.OutOrStdout(), strings.Replace(fs.FlagUsagesWrapped(1000), " --", " ", -1))
},
}
}