mirror of
https://github.com/k3s-io/k3s.git
synced 2024-06-07 19:41:36 +00:00
136 lines
4.3 KiB
Go
136 lines
4.3 KiB
Go
/*
|
|
Copyright 2018 The Kubernetes 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 genericclioptions
|
|
|
|
import (
|
|
"fmt"
|
|
"io/ioutil"
|
|
"sort"
|
|
"strings"
|
|
|
|
"github.com/spf13/cobra"
|
|
|
|
"k8s.io/cli-runtime/pkg/printers"
|
|
)
|
|
|
|
// templates are logically optional for specifying a format.
|
|
// this allows a user to specify a template format value
|
|
// as --output=go-template=
|
|
var templateFormats = map[string]bool{
|
|
"template": true,
|
|
"go-template": true,
|
|
"go-template-file": true,
|
|
"templatefile": true,
|
|
}
|
|
|
|
// GoTemplatePrintFlags provides default flags necessary for template printing.
|
|
// Given the following flag values, a printer can be requested that knows
|
|
// how to handle printing based on these values.
|
|
type GoTemplatePrintFlags struct {
|
|
// indicates if it is OK to ignore missing keys for rendering
|
|
// an output template.
|
|
AllowMissingKeys *bool
|
|
TemplateArgument *string
|
|
}
|
|
|
|
func (f *GoTemplatePrintFlags) AllowedFormats() []string {
|
|
formats := make([]string, 0, len(templateFormats))
|
|
for format := range templateFormats {
|
|
formats = append(formats, format)
|
|
}
|
|
sort.Strings(formats)
|
|
return formats
|
|
}
|
|
|
|
// ToPrinter receives an templateFormat and returns a printer capable of
|
|
// handling --template format printing.
|
|
// Returns false if the specified templateFormat does not match a template format.
|
|
func (f *GoTemplatePrintFlags) ToPrinter(templateFormat string) (printers.ResourcePrinter, error) {
|
|
if (f.TemplateArgument == nil || len(*f.TemplateArgument) == 0) && len(templateFormat) == 0 {
|
|
return nil, NoCompatiblePrinterError{Options: f, OutputFormat: &templateFormat}
|
|
}
|
|
|
|
templateValue := ""
|
|
|
|
if f.TemplateArgument == nil || len(*f.TemplateArgument) == 0 {
|
|
for format := range templateFormats {
|
|
format = format + "="
|
|
if strings.HasPrefix(templateFormat, format) {
|
|
templateValue = templateFormat[len(format):]
|
|
templateFormat = format[:len(format)-1]
|
|
break
|
|
}
|
|
}
|
|
} else {
|
|
templateValue = *f.TemplateArgument
|
|
}
|
|
|
|
if _, supportedFormat := templateFormats[templateFormat]; !supportedFormat {
|
|
return nil, NoCompatiblePrinterError{OutputFormat: &templateFormat, AllowedFormats: f.AllowedFormats()}
|
|
}
|
|
|
|
if len(templateValue) == 0 {
|
|
return nil, fmt.Errorf("template format specified but no template given")
|
|
}
|
|
|
|
if templateFormat == "templatefile" || templateFormat == "go-template-file" {
|
|
data, err := ioutil.ReadFile(templateValue)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error reading --template %s, %v\n", templateValue, err)
|
|
}
|
|
|
|
templateValue = string(data)
|
|
}
|
|
|
|
p, err := printers.NewGoTemplatePrinter([]byte(templateValue))
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error parsing template %s, %v\n", templateValue, err)
|
|
}
|
|
|
|
allowMissingKeys := true
|
|
if f.AllowMissingKeys != nil {
|
|
allowMissingKeys = *f.AllowMissingKeys
|
|
}
|
|
|
|
p.AllowMissingKeys(allowMissingKeys)
|
|
return p, nil
|
|
}
|
|
|
|
// AddFlags receives a *cobra.Command reference and binds
|
|
// flags related to template printing to it
|
|
func (f *GoTemplatePrintFlags) AddFlags(c *cobra.Command) {
|
|
if f.TemplateArgument != nil {
|
|
c.Flags().StringVar(f.TemplateArgument, "template", *f.TemplateArgument, "Template string or path to template file to use when -o=go-template, -o=go-template-file. The template format is golang templates [http://golang.org/pkg/text/template/#pkg-overview].")
|
|
c.MarkFlagFilename("template")
|
|
}
|
|
if f.AllowMissingKeys != nil {
|
|
c.Flags().BoolVar(f.AllowMissingKeys, "allow-missing-template-keys", *f.AllowMissingKeys, "If true, ignore any errors in templates when a field or map key is missing in the template. Only applies to golang and jsonpath output formats.")
|
|
}
|
|
}
|
|
|
|
// NewGoTemplatePrintFlags returns flags associated with
|
|
// --template printing, with default values set.
|
|
func NewGoTemplatePrintFlags() *GoTemplatePrintFlags {
|
|
allowMissingKeysPtr := true
|
|
templateValuePtr := ""
|
|
|
|
return &GoTemplatePrintFlags{
|
|
TemplateArgument: &templateValuePtr,
|
|
AllowMissingKeys: &allowMissingKeysPtr,
|
|
}
|
|
}
|