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/
run_script.go
121 lines (110 loc) · 3.55 KB
/
run_script.go
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// Copyright 2018 Google LLC
//
// 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 main
import (
"context"
"encoding/json"
"flag"
"log"
"sort"
"strings"
"github.com/GoogleCloudPlatform/cos-customizer/src/pkg/config"
"github.com/GoogleCloudPlatform/cos-customizer/src/pkg/fs"
"github.com/GoogleCloudPlatform/cos-customizer/src/pkg/provisioner"
"github.com/google/subcommands"
)
// RunScript implements subcommands.Command for the "run-script" command.
// This command configures the current image build process to customize the result image
// with a shell script.
type RunScript struct {
script string
env *mapVar
}
// Name implements subcommands.Command.Name.
func (r *RunScript) Name() string {
return "run-script"
}
// Synopsis implements subcommands.Command.Synopsis.
func (r *RunScript) Synopsis() string {
return "Configure the image build with a script to run."
}
// Usage implements subcommands.Command.Usage.
func (r *RunScript) Usage() string {
return `run-script [flags]
`
}
// SetFlags implements subcommands.Command.SetFlags.
func (r *RunScript) SetFlags(f *flag.FlagSet) {
f.StringVar(&r.script, "script", "", "Name of script to run.")
if r.env == nil {
r.env = newMapVar()
}
f.Var(r.env, "env", "Env vars to set before running the script.")
}
// createEnvString creates an environment variable string used by the
// provisioner tool. The format is the same as the format used by exec.Command.
// Elements are sorted for predictable output.
func createEnvString(m map[string]string) string {
var elems []string
for k, v := range m {
elems = append(elems, k+"="+v)
}
sort.Strings(elems)
return strings.Join(elems, ",")
}
// Execute implements subcommands.Command.Execute. It configures the current image build process to
// customize the result image with a shell script.
func (r *RunScript) Execute(_ context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
if f.NArg() != 0 {
f.Usage()
return subcommands.ExitUsageError
}
files := args[0].(*fs.Files)
if r.script == "" {
log.Printf("script not provided for %s step; script is required\n", r.Name())
return subcommands.ExitFailure
}
isValid, err := fs.ArchiveHasObject(files.UserBuildContextArchive, r.script)
if err != nil {
log.Println(err)
return subcommands.ExitFailure
}
if !isValid {
log.Printf("could not find script %s in build context", r.script)
return subcommands.ExitFailure
}
var provConfig provisioner.Config
if err := config.LoadFromFile(files.ProvConfig, &provConfig); err != nil {
log.Println(err)
return subcommands.ExitFailure
}
buf, err := json.Marshal(&provisioner.RunScriptStep{
BuildContext: "user",
Path: r.script,
Env: createEnvString(r.env.m),
})
if err != nil {
log.Println(err)
return subcommands.ExitFailure
}
provConfig.Steps = append(provConfig.Steps, provisioner.StepConfig{
Type: "RunScript",
Args: json.RawMessage(buf),
})
if err := config.SaveConfigToPath(files.ProvConfig, &provConfig); err != nil {
log.Println(err)
return subcommands.ExitFailure
}
return subcommands.ExitSuccess
}