211 lines
5.6 KiB
Go
211 lines
5.6 KiB
Go
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// Copyright 2019 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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package cmd
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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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"path"
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"flag"
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"github.com/google/subcommands"
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)
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// Install implements subcommands.Command.
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type Install struct {
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ConfigFile string
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Runtime string
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Experimental bool
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}
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// Name implements subcommands.Command.Name.
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func (*Install) Name() string {
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return "install"
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}
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// Synopsis implements subcommands.Command.Synopsis.
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func (*Install) 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 (*Install) Usage() string {
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return `install [flags] <name> [-- [args...]] -- if provided, args are passed 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 (i *Install) SetFlags(fs *flag.FlagSet) {
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fs.StringVar(&i.ConfigFile, "config_file", "/etc/docker/daemon.json", "path to Docker daemon config file")
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fs.StringVar(&i.Runtime, "runtime", "runsc", "runtime name")
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fs.BoolVar(&i.Experimental, "experimental", false, "enable experimental features")
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}
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// Execute implements subcommands.Command.Execute.
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func (i *Install) Execute(_ context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
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// Grab the name and arguments.
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runtimeArgs := f.Args()
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// Extract the executable.
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path, err := os.Executable()
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if err != nil {
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log.Fatalf("Error reading current exectuable: %v", err)
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}
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// Load the configuration file.
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c, err := readConfig(i.ConfigFile)
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if err != nil {
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log.Fatalf("Error reading config file %q: %v", i.ConfigFile, err)
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}
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// Add the given runtime.
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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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rts[i.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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Path: path,
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RuntimeArgs: runtimeArgs,
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}
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// Set experimental if required.
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if i.Experimental {
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c["experimental"] = true
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}
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// Write out the runtime.
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if err := writeConfig(c, i.ConfigFile); err != nil {
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log.Fatalf("Error writing config file %q: %v", i.ConfigFile, err)
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}
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// Success.
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log.Printf("Added runtime %q with arguments %v to %q.", i.Runtime, runtimeArgs, i.ConfigFile)
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return subcommands.ExitSuccess
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}
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// Uninstall implements subcommands.Command.
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type Uninstall struct {
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ConfigFile string
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Runtime string
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}
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// Name implements subcommands.Command.Name.
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func (*Uninstall) Name() string {
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return "uninstall"
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}
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// Synopsis implements subcommands.Command.Synopsis.
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func (*Uninstall) 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 (*Uninstall) Usage() string {
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return `uninstall [flags] <name>
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`
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}
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// SetFlags implements subcommands.Command.SetFlags.
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func (u *Uninstall) SetFlags(fs *flag.FlagSet) {
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fs.StringVar(&u.ConfigFile, "config_file", "/etc/docker/daemon.json", "path to Docker daemon config file")
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fs.StringVar(&u.Runtime, "runtime", "runsc", "runtime name")
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}
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// Execute implements subcommands.Command.Execute.
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func (u *Uninstall) Execute(_ context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
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log.Printf("Removing runtime %q from %q.", u.Runtime, u.ConfigFile)
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c, err := readConfig(u.ConfigFile)
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if err != nil {
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log.Fatalf("Error reading config file %q: %v", u.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", u.Runtime)
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}
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if _, ok := rts[u.Runtime]; !ok {
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log.Fatalf("runtime %q not found", u.Runtime)
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}
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delete(rts, u.Runtime)
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if err := writeConfig(c, u.ConfigFile); err != nil {
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log.Fatalf("Error writing config file %q: %v", u.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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// Read the configuration data.
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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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// Unmarshal the configuration.
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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{}, filename string) error {
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// Marshal the configuration.
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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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// Copy the old configuration.
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old, err := ioutil.ReadFile(filename)
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if err != nil {
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if !os.IsNotExist(err) {
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return fmt.Errorf("error reading config file %q: %v", filename, err)
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}
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} else {
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if err := ioutil.WriteFile(filename+"~", old, 0644); err != nil {
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return fmt.Errorf("error backing up config file %q: %v", filename, err)
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}
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}
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// Make the necessary directories.
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if err := os.MkdirAll(path.Dir(filename), 0755); err != nil {
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return fmt.Errorf("error creating config directory for %q: %v", filename, err)
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}
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// Write the new configuration.
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if err := ioutil.WriteFile(filename, b, 0644); err != nil {
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return fmt.Errorf("error writing config file %q: %v", filename, err)
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}
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return nil
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}
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