mirror of https://github.com/k3s-io/k3s
112 lines
3.4 KiB
Go
112 lines
3.4 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 get
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"strings"
|
|
|
|
"github.com/spf13/cobra"
|
|
|
|
"k8s.io/cli-runtime/pkg/genericclioptions"
|
|
"k8s.io/cli-runtime/pkg/printers"
|
|
"k8s.io/kubectl/pkg/scheme"
|
|
)
|
|
|
|
var columnsFormats = map[string]bool{
|
|
"custom-columns-file": true,
|
|
"custom-columns": true,
|
|
}
|
|
|
|
// CustomColumnsPrintFlags provides default flags necessary for printing
|
|
// custom resource columns from an inline-template or file.
|
|
type CustomColumnsPrintFlags struct {
|
|
NoHeaders bool
|
|
TemplateArgument string
|
|
}
|
|
|
|
func (f *CustomColumnsPrintFlags) AllowedFormats() []string {
|
|
formats := make([]string, 0, len(columnsFormats))
|
|
for format := range columnsFormats {
|
|
formats = append(formats, format)
|
|
}
|
|
return formats
|
|
}
|
|
|
|
// ToPrinter receives an templateFormat and returns a printer capable of
|
|
// handling custom-column printing.
|
|
// Returns false if the specified templateFormat does not match a supported format.
|
|
// Supported format types can be found in pkg/printers/printers.go
|
|
func (f *CustomColumnsPrintFlags) ToPrinter(templateFormat string) (printers.ResourcePrinter, error) {
|
|
if len(templateFormat) == 0 {
|
|
return nil, genericclioptions.NoCompatiblePrinterError{}
|
|
}
|
|
|
|
templateValue := ""
|
|
|
|
if len(f.TemplateArgument) == 0 {
|
|
for format := range columnsFormats {
|
|
format = format + "="
|
|
if strings.HasPrefix(templateFormat, format) {
|
|
templateValue = templateFormat[len(format):]
|
|
templateFormat = format[:len(format)-1]
|
|
break
|
|
}
|
|
}
|
|
} else {
|
|
templateValue = f.TemplateArgument
|
|
}
|
|
|
|
if _, supportedFormat := columnsFormats[templateFormat]; !supportedFormat {
|
|
return nil, genericclioptions.NoCompatiblePrinterError{OutputFormat: &templateFormat, AllowedFormats: f.AllowedFormats()}
|
|
}
|
|
|
|
if len(templateValue) == 0 {
|
|
return nil, fmt.Errorf("custom-columns format specified but no custom columns given")
|
|
}
|
|
|
|
// UniversalDecoder call must specify parameter versions; otherwise it will decode to internal versions.
|
|
decoder := scheme.Codecs.UniversalDecoder(scheme.Scheme.PrioritizedVersionsAllGroups()...)
|
|
|
|
if templateFormat == "custom-columns-file" {
|
|
file, err := os.Open(templateValue)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error reading template %s, %v\n", templateValue, err)
|
|
}
|
|
defer file.Close()
|
|
p, err := NewCustomColumnsPrinterFromTemplate(file, decoder)
|
|
return p, err
|
|
}
|
|
|
|
return NewCustomColumnsPrinterFromSpec(templateValue, decoder, f.NoHeaders)
|
|
}
|
|
|
|
// AddFlags receives a *cobra.Command reference and binds
|
|
// flags related to custom-columns printing
|
|
func (f *CustomColumnsPrintFlags) AddFlags(c *cobra.Command) {}
|
|
|
|
// NewCustomColumnsPrintFlags returns flags associated with
|
|
// custom-column printing, with default values set.
|
|
// NoHeaders and TemplateArgument should be set by callers.
|
|
func NewCustomColumnsPrintFlags() *CustomColumnsPrintFlags {
|
|
return &CustomColumnsPrintFlags{
|
|
NoHeaders: false,
|
|
TemplateArgument: "",
|
|
}
|
|
}
|