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root.go
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root.go
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// Copyright 2017 Authors of Cilium
//
// 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 cmd
import (
"fmt"
"io"
"os"
clientPkg "github.com/cilium/cilium/pkg/client"
"github.com/cilium/cilium/pkg/components"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
var (
cfgFile string
client *clientPkg.Client
log = logrus.New()
verbose = false
)
// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
Use: "cilium",
Short: "CLI",
Long: `CLI for interacting with the local Cilium Agent`,
}
// Execute adds all child commands to the root command sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
if err := rootCmd.Execute(); err != nil {
fmt.Println(err)
os.Exit(-1)
}
}
func init() {
if components.IsCiliumAgent() {
return
}
cobra.OnInitialize(initConfig)
flags := rootCmd.PersistentFlags()
flags.StringVar(&cfgFile, "config", "", "config file (default is $HOME/.cilium.yaml)")
flags.BoolP("debug", "D", false, "Enable debug messages")
flags.StringP("host", "H", "", "URI to server-side API")
viper.BindPFlags(flags)
rootCmd.AddCommand(newCmdCompletion(os.Stdout))
rootCmd.SetOutput(os.Stderr)
}
// initConfig reads in config file and ENV variables if set.
func initConfig() {
if cfgFile != "" { // enable ability to specify config file via flag
viper.SetConfigFile(cfgFile)
}
viper.SetEnvPrefix("cilium")
viper.SetConfigName(".cilium") // name of config file (without extension)
viper.AddConfigPath("$HOME") // adding home directory as first search path
viper.AutomaticEnv() // read in environment variables that match
// If a config file is found, read it in.
if err := viper.ReadInConfig(); err == nil {
fmt.Println("Using config file:", viper.ConfigFileUsed())
}
if viper.GetBool("debug") {
log.Level = logrus.DebugLevel
} else {
log.Level = logrus.InfoLevel
}
if cl, err := clientPkg.NewClient(viper.GetString("host")); err != nil {
Fatalf("Error while creating client: %s\n", err)
} else {
client = cl
}
}
const copyRightHeader = `
# Copyright 2017 Authors of Cilium
#
# 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.
`
var (
completionExample = `
# Installing bash completion on macOS using homebrew
## If running Bash 3.2 included with macOS
brew install bash-completion
## or, if running Bash 4.1+
brew install bash-completion@2
## afterwards you only need to run
cilium completion bash > $(brew --prefix)/etc/bash_completion.d/cilium
# Installing bash completion on Linux
## Load the cilium completion code for bash into the current shell
source <(cilium completion bash)
## Write bash completion code to a file and source if from .bash_profile
cilium completion bash > ~/.cilium/completion.bash.inc
printf "
# Cilium shell completion
source '$HOME/.cilium/completion.bash.inc'
" >> $HOME/.bash_profile
source $HOME/.bash_profile`
)
func newCmdCompletion(out io.Writer) *cobra.Command {
cmd := &cobra.Command{
Use: "completion [bash]",
Short: "Output shell completion code for bash",
Long: ``,
Example: completionExample,
Run: func(cmd *cobra.Command, args []string) {
runCompletion(out, cmd, args)
},
ValidArgs: []string{"bash"},
}
return cmd
}
func runCompletion(out io.Writer, cmd *cobra.Command, args []string) error {
if len(args) > 1 {
return fmt.Errorf("Too many arguments. Expected only the shell type.")
}
if _, err := out.Write([]byte(copyRightHeader)); err != nil {
return err
}
return cmd.Parent().GenBashCompletion(out)
}