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command.go
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command.go
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package validate
import (
"flag"
"fmt"
"github.com/mitchellh/packer/packer"
"io/ioutil"
"log"
"strings"
)
type Command byte
func (Command) Help() string {
return strings.TrimSpace(helpString)
}
func (c Command) Run(env packer.Environment, args []string) int {
var cfgSyntaxOnly bool
cmdFlags := flag.NewFlagSet("validate", flag.ContinueOnError)
cmdFlags.Usage = func() { env.Ui().Say(c.Help()) }
cmdFlags.BoolVar(&cfgSyntaxOnly, "syntax-only", false, "check syntax only")
if err := cmdFlags.Parse(args); err != nil {
return 1
}
args = cmdFlags.Args()
if len(args) != 1 {
cmdFlags.Usage()
return 1
}
// Read the file into a byte array so that we can parse the template
log.Printf("Reading template: %s", args[0])
tplData, err := ioutil.ReadFile(args[0])
if err != nil {
env.Ui().Error(fmt.Sprintf("Failed to read template file: %s", err))
return 1
}
// Parse the template into a machine-usable format
log.Println("Parsing template...")
tpl, err := packer.ParseTemplate(tplData)
if err != nil {
env.Ui().Error(fmt.Sprintf("Failed to parse template: %s", err))
return 1
}
if cfgSyntaxOnly {
env.Ui().Say("Syntax-only check passed. Everything looks okay.")
return 0
}
errs := make([]error, 0)
// The component finder for our builds
components := &packer.ComponentFinder{
Builder: env.Builder,
Hook: env.Hook,
PostProcessor: env.PostProcessor,
Provisioner: env.Provisioner,
}
// Otherwise, get all the builds
buildNames := tpl.BuildNames()
builds := make([]packer.Build, 0, len(buildNames))
for _, buildName := range buildNames {
log.Printf("Creating build from template for: %s", buildName)
build, err := tpl.Build(buildName, components)
if err != nil {
errs = append(errs, fmt.Errorf("Build '%s': %s", buildName, err))
continue
}
builds = append(builds, build)
}
// Check the configuration of all builds
for _, b := range builds {
log.Printf("Preparing build: %s", b.Name())
err := b.Prepare()
if err != nil {
errs = append(errs, fmt.Errorf("Errors validating build '%s'. %s", b.Name(), err))
}
}
if len(errs) > 0 {
env.Ui().Error("Template validation failed. Errors are shown below.\n")
for i, err := range errs {
env.Ui().Error(err.Error())
if (i + 1) < len(errs) {
env.Ui().Error("")
}
}
return 1
}
env.Ui().Say("Template validated successfully.")
return 0
}
func (Command) Synopsis() string {
return "check that a template is valid"
}