k8s.io/test-infra@v0.0.0-20240520184403-27c6b4c223d8/def/configmap/main.go (about)

     1  /*
     2  Copyright 2018 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  // configmap will write a configmap to --output from --data=name=/path/to/source
    18  package main
    19  
    20  import (
    21  	"bytes"
    22  	"flag"
    23  	"fmt"
    24  	"log"
    25  	"os"
    26  	"strings"
    27  
    28  	v1 "k8s.io/api/core/v1"
    29  	"sigs.k8s.io/yaml"
    30  )
    31  
    32  type options struct {
    33  	data      multiKeyValue
    34  	labels    multiKeyValue
    35  	name      string
    36  	namespace string
    37  	output    string
    38  }
    39  
    40  // multiKeyValue allows --key=value --key=value2
    41  type multiKeyValue map[string]string
    42  
    43  func (mkv *multiKeyValue) String() string {
    44  	var b bytes.Buffer
    45  	if mkv == nil {
    46  		return ""
    47  	}
    48  	for k, v := range *mkv {
    49  		if b.Len() > 0 {
    50  			b.WriteString(",")
    51  		}
    52  		fmt.Fprintf(&b, "%s=%s", k, v)
    53  	}
    54  	return b.String()
    55  }
    56  
    57  func (mkv *multiKeyValue) Set(v string) error {
    58  	p := strings.SplitN(v, "=", 2)
    59  	if len(p) != 2 {
    60  		return fmt.Errorf("%s does not match label=value", v)
    61  	}
    62  	if mkv != nil {
    63  		(*mkv)[p[0]] = p[1]
    64  	}
    65  	return nil
    66  }
    67  
    68  func flags() *options {
    69  	opt := options{
    70  		data:   multiKeyValue{},
    71  		labels: multiKeyValue{},
    72  	}
    73  	flag.StringVar(&opt.output, "output", "", "Write configmap here instead of stdout")
    74  	flag.StringVar(&opt.name, "name", "", "Name of resource")
    75  	flag.StringVar(&opt.namespace, "namespace", "", "Namespace for resource")
    76  	flag.Var(&opt.labels, "label", "Add a key=value label (repeat flag)")
    77  	flag.Var(&opt.data, "data", "Add a key=/path/to/file configmap source (repeat flag)")
    78  	flag.Parse()
    79  	return &opt
    80  }
    81  
    82  func buildConfigMap(name, namespace string, labels map[string]string, data map[string]string) (*v1.ConfigMap, error) {
    83  
    84  	var cm v1.ConfigMap
    85  	cm.TypeMeta.Kind = "ConfigMap"
    86  	cm.TypeMeta.APIVersion = "v1"
    87  	cm.ObjectMeta.Name = name
    88  	cm.ObjectMeta.Namespace = namespace
    89  	cm.ObjectMeta.Labels = labels
    90  	if len(data) > 0 {
    91  		cm.Data = map[string]string{}
    92  		for key, value := range data {
    93  			buf, err := os.ReadFile(value)
    94  			if err != nil {
    95  				wd, _ := os.Getwd()
    96  				return nil, fmt.Errorf("could not read %s/%s: %w", wd, value, err)
    97  			}
    98  			cm.Data[key] = string(buf)
    99  		}
   100  	}
   101  	return &cm, nil
   102  }
   103  
   104  func main() {
   105  	opt := flags()
   106  	if opt.name == "" {
   107  		log.Fatal("Non-empty --name required")
   108  	}
   109  	cm, err := buildConfigMap(opt.name, opt.namespace, opt.labels, opt.data)
   110  	if err != nil {
   111  		log.Fatalf("Failed to create %s: %v", opt.name, err)
   112  	}
   113  	buf, err := yaml.Marshal(cm)
   114  	if err != nil {
   115  		log.Fatalf("Failed to serialize %s: %v", opt.name, err)
   116  	}
   117  	if opt.output == "" {
   118  		fmt.Print(string(buf))
   119  		return
   120  	}
   121  	err = os.WriteFile(opt.output, buf, 0644)
   122  	if err != nil {
   123  		log.Fatalf("Failed to write %s: %v", opt.output, err)
   124  	}
   125  }