194 lines
5.1 KiB
Go
194 lines
5.1 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Helper tool to configure Docker daemon.
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package main
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import (
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"context"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"flag"
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"github.com/google/subcommands"
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)
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var (
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configFile = flag.String("config_file", "/etc/docker/daemon.json", "path to Docker daemon config file")
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experimental = flag.Bool("experimental", false, "enable experimental features")
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)
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func main() {
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subcommands.Register(subcommands.HelpCommand(), "")
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subcommands.Register(subcommands.FlagsCommand(), "")
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subcommands.Register(&runtimeAdd{}, "")
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subcommands.Register(&runtimeRemove{}, "")
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// All subcommands must be registered before flag parsing.
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flag.Parse()
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exitCode := subcommands.Execute(context.Background())
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os.Exit(int(exitCode))
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}
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type runtime struct {
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Path string `json:"path,omitempty"`
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RuntimeArgs []string `json:"runtimeArgs,omitempty"`
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}
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// runtimeAdd implements subcommands.Command.
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type runtimeAdd struct {
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}
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// Name implements subcommands.Command.Name.
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func (*runtimeAdd) Name() string {
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return "runtime-add"
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}
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// Synopsis implements subcommands.Command.Synopsis.
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func (*runtimeAdd) Synopsis() string {
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return "adds a runtime to docker daemon configuration"
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}
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// Usage implements subcommands.Command.Usage.
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func (*runtimeAdd) Usage() string {
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return `runtime-add [flags] <name> <path> [args...] -- if provided, args are passed as arguments to the runtime
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`
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}
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// SetFlags implements subcommands.Command.SetFlags.
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func (*runtimeAdd) SetFlags(*flag.FlagSet) {
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}
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// Execute implements subcommands.Command.Execute.
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func (r *runtimeAdd) Execute(_ context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
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if f.NArg() < 2 {
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f.Usage()
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return subcommands.ExitUsageError
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}
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name := f.Arg(0)
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path := f.Arg(1)
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runtimeArgs := f.Args()[2:]
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fmt.Printf("Adding runtime %q to file %q\n", name, *configFile)
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c, err := readConfig(*configFile)
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if err != nil {
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log.Fatalf("Error reading config file %q: %v", *configFile, err)
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}
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var rts map[string]interface{}
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if i, ok := c["runtimes"]; ok {
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rts = i.(map[string]interface{})
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} else {
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rts = make(map[string]interface{})
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c["runtimes"] = rts
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}
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if *experimental {
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c["experimental"] = true
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}
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rts[name] = runtime{Path: path, RuntimeArgs: runtimeArgs}
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if err := writeConfig(c, *configFile); err != nil {
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log.Fatalf("Error writing config file %q: %v", *configFile, err)
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}
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return subcommands.ExitSuccess
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}
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// runtimeRemove implements subcommands.Command.
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type runtimeRemove struct {
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}
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// Name implements subcommands.Command.Name.
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func (*runtimeRemove) Name() string {
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return "runtime-rm"
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}
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// Synopsis implements subcommands.Command.Synopsis.
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func (*runtimeRemove) Synopsis() string {
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return "removes a runtime from docker daemon configuration"
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}
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// Usage implements subcommands.Command.Usage.
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func (*runtimeRemove) Usage() string {
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return `runtime-rm [flags] <name>
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`
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}
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// SetFlags implements subcommands.Command.SetFlags.
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func (*runtimeRemove) SetFlags(*flag.FlagSet) {
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}
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// Execute implements subcommands.Command.Execute.
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func (r *runtimeRemove) Execute(_ context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
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if f.NArg() != 1 {
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f.Usage()
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return subcommands.ExitUsageError
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}
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name := f.Arg(0)
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fmt.Printf("Removing runtime %q from file %q\n", name, *configFile)
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c, err := readConfig(*configFile)
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if err != nil {
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log.Fatalf("Error reading config file %q: %v", *configFile, err)
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}
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var rts map[string]interface{}
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if i, ok := c["runtimes"]; ok {
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rts = i.(map[string]interface{})
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} else {
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log.Fatalf("runtime %q not found", name)
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}
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if _, ok := rts[name]; !ok {
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log.Fatalf("runtime %q not found", name)
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}
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delete(rts, name)
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if err := writeConfig(c, *configFile); err != nil {
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log.Fatalf("Error writing config file %q: %v", *configFile, err)
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}
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return subcommands.ExitSuccess
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}
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func readConfig(path string) (map[string]interface{}, error) {
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configBytes, err := ioutil.ReadFile(path)
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if err != nil && !os.IsNotExist(err) {
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return nil, err
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}
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c := make(map[string]interface{})
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if len(configBytes) > 0 {
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if err := json.Unmarshal(configBytes, &c); err != nil {
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return nil, err
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}
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}
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return c, nil
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}
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func writeConfig(c map[string]interface{}, path string) error {
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b, err := json.MarshalIndent(c, "", " ")
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if err != nil {
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return err
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}
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if err := os.Rename(path, path+"~"); err != nil && !os.IsNotExist(err) {
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return fmt.Errorf("error renaming config file %q: %v", path, err)
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}
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if err := ioutil.WriteFile(path, b, 0644); err != nil {
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return fmt.Errorf("error writing config file %q: %v", path, err)
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}
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return nil
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}
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