packer-cn/template/template.go

330 lines
8.2 KiB
Go

package template
import (
"encoding/json"
"errors"
"fmt"
"time"
multierror "github.com/hashicorp/go-multierror"
)
// Template represents the parsed template that is used to configure
// Packer builds.
type Template struct {
// Path is the path to the template. This will be blank if Parse is
// used, but will be automatically populated by ParseFile.
Path string
Description string
MinVersion string
Comments map[string]string
Variables map[string]*Variable
SensitiveVariables []*Variable
Builders map[string]*Builder
Provisioners []*Provisioner
PostProcessors [][]*PostProcessor
Push Push
// RawContents is just the raw data for this template
RawContents []byte
}
// Raw converts a Template struct back into the raw Packer template structure
func (t *Template) Raw() (*rawTemplate, error) {
var out rawTemplate
out.MinVersion = t.MinVersion
out.Description = t.Description
for k, v := range t.Comments {
out.Comments = append(out.Comments, map[string]string{k: v})
}
for _, b := range t.Builders {
out.Builders = append(out.Builders, b)
}
for _, p := range t.Provisioners {
out.Provisioners = append(out.Provisioners, p)
}
for _, pp := range t.PostProcessors {
out.PostProcessors = append(out.PostProcessors, pp)
}
for _, v := range t.SensitiveVariables {
out.SensitiveVariables = append(out.SensitiveVariables, v.Key)
}
for k, v := range t.Variables {
if out.Variables == nil {
out.Variables = make(map[string]interface{})
}
out.Variables[k] = v
}
if t.Push.Name != "" {
b, _ := json.Marshal(t.Push)
var m map[string]interface{}
_ = json.Unmarshal(b, &m)
out.Push = m
}
return &out, nil
}
// Builder represents a builder configured in the template
type Builder struct {
Name string `json:"name,omitempty"`
Type string `json:"type"`
Config map[string]interface{} `json:"config,omitempty"`
}
// MarshalJSON conducts the necessary flattening of the Builder struct
// to provide valid Packer template JSON
func (b *Builder) MarshalJSON() ([]byte, error) {
// Avoid recursion
type Builder_ Builder
out, _ := json.Marshal(Builder_(*b))
var m map[string]json.RawMessage
_ = json.Unmarshal(out, &m)
// Flatten Config
delete(m, "config")
for k, v := range b.Config {
out, _ = json.Marshal(v)
m[k] = out
}
return json.Marshal(m)
}
// PostProcessor represents a post-processor within the template.
type PostProcessor struct {
OnlyExcept `mapstructure:",squash" json:",omitempty"`
Name string `json:"name,omitempty"`
Type string `json:"type"`
KeepInputArtifact *bool `mapstructure:"keep_input_artifact" json:"keep_input_artifact,omitempty"`
Config map[string]interface{} `json:"config,omitempty"`
}
// MarshalJSON conducts the necessary flattening of the PostProcessor struct
// to provide valid Packer template JSON
func (p *PostProcessor) MarshalJSON() ([]byte, error) {
// Early exit for simple definitions
if len(p.Config) == 0 && len(p.OnlyExcept.Only) == 0 && len(p.OnlyExcept.Except) == 0 && p.KeepInputArtifact == nil {
return json.Marshal(p.Type)
}
// Avoid recursion
type PostProcessor_ PostProcessor
out, _ := json.Marshal(PostProcessor_(*p))
var m map[string]json.RawMessage
_ = json.Unmarshal(out, &m)
// Flatten Config
delete(m, "config")
for k, v := range p.Config {
out, _ = json.Marshal(v)
m[k] = out
}
return json.Marshal(m)
}
// Provisioner represents a provisioner within the template.
type Provisioner struct {
OnlyExcept `mapstructure:",squash" json:",omitempty"`
Type string `json:"type"`
Config map[string]interface{} `json:"config,omitempty"`
Override map[string]interface{} `json:"override,omitempty"`
PauseBefore time.Duration `mapstructure:"pause_before" json:"pause_before,omitempty"`
Timeout time.Duration `mapstructure:"timeout" json:"timeout,omitempty"`
}
// MarshalJSON conducts the necessary flattening of the Provisioner struct
// to provide valid Packer template JSON
func (p *Provisioner) MarshalJSON() ([]byte, error) {
// Avoid recursion
type Provisioner_ Provisioner
out, _ := json.Marshal(Provisioner_(*p))
var m map[string]json.RawMessage
_ = json.Unmarshal(out, &m)
// Flatten Config
delete(m, "config")
for k, v := range p.Config {
out, _ = json.Marshal(v)
m[k] = out
}
return json.Marshal(m)
}
// Push represents the configuration for pushing the template to Atlas.
type Push struct {
Name string
Address string
BaseDir string `mapstructure:"base_dir"`
Include []string
Exclude []string
Token string
VCS bool
}
// Variable represents a variable within the template
type Variable struct {
Key string
Default string
Required bool
}
func (v *Variable) MarshalJSON() ([]byte, error) {
if v.Required {
// We use a nil pointer to coax Go into marshalling it as a JSON null
var ret *string
return json.Marshal(ret)
}
return json.Marshal(v.Default)
}
// OnlyExcept is a struct that is meant to be embedded that contains the
// logic required for "only" and "except" meta-parameters.
type OnlyExcept struct {
Only []string `json:"only,omitempty"`
Except []string `json:"except,omitempty"`
}
//-------------------------------------------------------------------
// Functions
//-------------------------------------------------------------------
// Validate does some basic validation of the template on top of the
// validation that occurs while parsing. If possible, we try to defer
// validation to here. The validation errors that occur during parsing
// are the minimal necessary to make sure parsing builds a reasonable
// Template structure.
func (t *Template) Validate() error {
var err error
// At least one builder must be defined
if len(t.Builders) == 0 {
err = multierror.Append(err, errors.New(
"at least one builder must be defined"))
}
// Verify that the provisioner overrides target builders that exist
for i, p := range t.Provisioners {
// Validate only/except
if verr := p.OnlyExcept.Validate(t); verr != nil {
for _, e := range multierror.Append(verr).Errors {
err = multierror.Append(err, fmt.Errorf(
"provisioner %d: %s", i+1, e))
}
}
// Validate overrides
for name := range p.Override {
if _, ok := t.Builders[name]; !ok {
err = multierror.Append(err, fmt.Errorf(
"provisioner %d: override '%s' doesn't exist",
i+1, name))
}
}
}
// Verify post-processors
for i, chain := range t.PostProcessors {
for j, p := range chain {
// Validate only/except
if verr := p.OnlyExcept.Validate(t); verr != nil {
for _, e := range multierror.Append(verr).Errors {
err = multierror.Append(err, fmt.Errorf(
"post-processor %d.%d: %s", i+1, j+1, e))
}
}
}
}
return err
}
// Skip says whether or not to skip the build with the given name.
func (o *OnlyExcept) Skip(n string) bool {
if len(o.Only) > 0 {
for _, v := range o.Only {
if v == n {
return false
}
}
return true
}
if len(o.Except) > 0 {
for _, v := range o.Except {
if v == n {
return true
}
}
return false
}
return false
}
// Validate validates that the OnlyExcept settings are correct for a thing.
func (o *OnlyExcept) Validate(t *Template) error {
if len(o.Only) > 0 && len(o.Except) > 0 {
return errors.New("only one of 'only' or 'except' may be specified")
}
var err error
for _, n := range o.Only {
if _, ok := t.Builders[n]; !ok {
err = multierror.Append(err, fmt.Errorf(
"'only' specified builder '%s' not found", n))
}
}
for _, n := range o.Except {
if _, ok := t.Builders[n]; !ok {
err = multierror.Append(err, fmt.Errorf(
"'except' specified builder '%s' not found", n))
}
}
return err
}
//-------------------------------------------------------------------
// GoStringer
//-------------------------------------------------------------------
func (b *Builder) GoString() string {
return fmt.Sprintf("*%#v", *b)
}
func (p *Provisioner) GoString() string {
return fmt.Sprintf("*%#v", *p)
}
func (p *PostProcessor) GoString() string {
return fmt.Sprintf("*%#v", *p)
}
func (v *Variable) GoString() string {
return fmt.Sprintf("*%#v", *v)
}