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// Copyright 2019 The gVisor 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 cmd
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"os"
"path"
"flag"
"github.com/google/subcommands"
)
// Install implements subcommands.Command.
type Install struct {
ConfigFile string
Runtime string
Experimental bool
}
// Name implements subcommands.Command.Name.
func (*Install) Name() string {
return "install"
}
// Synopsis implements subcommands.Command.Synopsis.
func (*Install) Synopsis() string {
return "adds a runtime to docker daemon configuration"
}
// Usage implements subcommands.Command.Usage.
func (*Install) Usage() string {
return `install [flags] <name> [-- [args...]] -- if provided, args are passed to the runtime
`
}
// SetFlags implements subcommands.Command.SetFlags.
func (i *Install) SetFlags(fs *flag.FlagSet) {
fs.StringVar(&i.ConfigFile, "config_file", "/etc/docker/daemon.json", "path to Docker daemon config file")
fs.StringVar(&i.Runtime, "runtime", "runsc", "runtime name")
fs.BoolVar(&i.Experimental, "experimental", false, "enable experimental features")
}
// Execute implements subcommands.Command.Execute.
func (i *Install) Execute(_ context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
// Grab the name and arguments.
runtimeArgs := f.Args()
// Extract the executable.
path, err := os.Executable()
if err != nil {
log.Fatalf("Error reading current exectuable: %v", err)
}
// Load the configuration file.
c, err := readConfig(i.ConfigFile)
if err != nil {
log.Fatalf("Error reading config file %q: %v", i.ConfigFile, err)
}
// Add the given runtime.
var rts map[string]interface{}
if i, ok := c["runtimes"]; ok {
rts = i.(map[string]interface{})
} else {
rts = make(map[string]interface{})
c["runtimes"] = rts
}
rts[i.Runtime] = struct {
Path string `json:"path,omitempty"`
RuntimeArgs []string `json:"runtimeArgs,omitempty"`
}{
Path: path,
RuntimeArgs: runtimeArgs,
}
// Set experimental if required.
if i.Experimental {
c["experimental"] = true
}
// Write out the runtime.
if err := writeConfig(c, i.ConfigFile); err != nil {
log.Fatalf("Error writing config file %q: %v", i.ConfigFile, err)
}
// Success.
log.Printf("Added runtime %q with arguments %v to %q.", i.Runtime, runtimeArgs, i.ConfigFile)
return subcommands.ExitSuccess
}
// Uninstall implements subcommands.Command.
type Uninstall struct {
ConfigFile string
Runtime string
}
// Name implements subcommands.Command.Name.
func (*Uninstall) Name() string {
return "uninstall"
}
// Synopsis implements subcommands.Command.Synopsis.
func (*Uninstall) Synopsis() string {
return "removes a runtime from docker daemon configuration"
}
// Usage implements subcommands.Command.Usage.
func (*Uninstall) Usage() string {
return `uninstall [flags] <name>
`
}
// SetFlags implements subcommands.Command.SetFlags.
func (u *Uninstall) SetFlags(fs *flag.FlagSet) {
fs.StringVar(&u.ConfigFile, "config_file", "/etc/docker/daemon.json", "path to Docker daemon config file")
fs.StringVar(&u.Runtime, "runtime", "runsc", "runtime name")
}
// Execute implements subcommands.Command.Execute.
func (u *Uninstall) Execute(_ context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
log.Printf("Removing runtime %q from %q.", u.Runtime, u.ConfigFile)
c, err := readConfig(u.ConfigFile)
if err != nil {
log.Fatalf("Error reading config file %q: %v", u.ConfigFile, err)
}
var rts map[string]interface{}
if i, ok := c["runtimes"]; ok {
rts = i.(map[string]interface{})
} else {
log.Fatalf("runtime %q not found", u.Runtime)
}
if _, ok := rts[u.Runtime]; !ok {
log.Fatalf("runtime %q not found", u.Runtime)
}
delete(rts, u.Runtime)
if err := writeConfig(c, u.ConfigFile); err != nil {
log.Fatalf("Error writing config file %q: %v", u.ConfigFile, err)
}
return subcommands.ExitSuccess
}
func readConfig(path string) (map[string]interface{}, error) {
// Read the configuration data.
configBytes, err := ioutil.ReadFile(path)
if err != nil && !os.IsNotExist(err) {
return nil, err
}
// Unmarshal the configuration.
c := make(map[string]interface{})
if len(configBytes) > 0 {
if err := json.Unmarshal(configBytes, &c); err != nil {
return nil, err
}
}
return c, nil
}
func writeConfig(c map[string]interface{}, filename string) error {
// Marshal the configuration.
b, err := json.MarshalIndent(c, "", " ")
if err != nil {
return err
}
// Copy the old configuration.
old, err := ioutil.ReadFile(filename)
if err != nil {
if !os.IsNotExist(err) {
return fmt.Errorf("error reading config file %q: %v", filename, err)
}
} else {
if err := ioutil.WriteFile(filename+"~", old, 0644); err != nil {
return fmt.Errorf("error backing up config file %q: %v", filename, err)
}
}
// Make the necessary directories.
if err := os.MkdirAll(path.Dir(filename), 0755); err != nil {
return fmt.Errorf("error creating config directory for %q: %v", filename, err)
}
// Write the new configuration.
if err := ioutil.WriteFile(filename, b, 0644); err != nil {
return fmt.Errorf("error writing config file %q: %v", filename, err)
}
return nil
}
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