github.com/Racer159/helm-experiment@v0.0.0-20230822001441-1eb31183f614/src/helm.go (about)

     1  /*
     2  Copyright The Helm 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  package cmd // import "helm.sh/helm/v3/cmd/helm"
    18  
    19  import (
    20  	"fmt"
    21  	"io"
    22  	"log"
    23  	"os"
    24  	"strings"
    25  
    26  	"github.com/spf13/cobra"
    27  	"sigs.k8s.io/yaml"
    28  
    29  	// Import to initialize client auth plugins.
    30  	_ "k8s.io/client-go/plugin/pkg/client/auth"
    31  
    32  	"helm.sh/helm/v3/pkg/action"
    33  	"helm.sh/helm/v3/pkg/cli"
    34  	"helm.sh/helm/v3/pkg/kube"
    35  	kubefake "helm.sh/helm/v3/pkg/kube/fake"
    36  	"helm.sh/helm/v3/pkg/release"
    37  	"helm.sh/helm/v3/pkg/storage/driver"
    38  )
    39  
    40  var settings = cli.New()
    41  
    42  func init() {
    43  	log.SetFlags(log.Lshortfile)
    44  }
    45  
    46  func debug(format string, v ...interface{}) {
    47  	if settings.Debug {
    48  		format = fmt.Sprintf("[debug] %s\n", format)
    49  		log.Output(2, fmt.Sprintf(format, v...))
    50  	}
    51  }
    52  
    53  func warning(format string, v ...interface{}) {
    54  	format = fmt.Sprintf("WARNING: %s\n", format)
    55  	fmt.Fprintf(os.Stderr, format, v...)
    56  }
    57  
    58  func main() {
    59  	// Setting the name of the app for managedFields in the Kubernetes client.
    60  	// It is set here to the full name of "helm" so that renaming of helm to
    61  	// another name (e.g., helm2 or helm3) does not change the name of the
    62  	// manager as picked up by the automated name detection.
    63  	kube.ManagedFieldsManager = "helm"
    64  
    65  	actionConfig := new(action.Configuration)
    66  	cmd, err := NewRootCmd(actionConfig, os.Stdout, os.Args[1:])
    67  	if err != nil {
    68  		warning("%+v", err)
    69  		os.Exit(1)
    70  	}
    71  
    72  	// run when each command's execute method is called
    73  	cobra.OnInitialize(func() {
    74  		helmDriver := os.Getenv("HELM_DRIVER")
    75  		if err := actionConfig.Init(settings.RESTClientGetter(), settings.Namespace(), helmDriver, debug); err != nil {
    76  			log.Fatal(err)
    77  		}
    78  		if helmDriver == "memory" {
    79  			loadReleasesInMemory(actionConfig)
    80  		}
    81  	})
    82  
    83  	if err := cmd.Execute(); err != nil {
    84  		debug("%+v", err)
    85  		switch e := err.(type) {
    86  		case pluginError:
    87  			os.Exit(e.code)
    88  		default:
    89  			os.Exit(1)
    90  		}
    91  	}
    92  }
    93  
    94  // This function loads releases into the memory storage if the
    95  // environment variable is properly set.
    96  func loadReleasesInMemory(actionConfig *action.Configuration) {
    97  	filePaths := strings.Split(os.Getenv("HELM_MEMORY_DRIVER_DATA"), ":")
    98  	if len(filePaths) == 0 {
    99  		return
   100  	}
   101  
   102  	store := actionConfig.Releases
   103  	mem, ok := store.Driver.(*driver.Memory)
   104  	if !ok {
   105  		// For an unexpected reason we are not dealing with the memory storage driver.
   106  		return
   107  	}
   108  
   109  	actionConfig.KubeClient = &kubefake.PrintingKubeClient{Out: io.Discard}
   110  
   111  	for _, path := range filePaths {
   112  		b, err := os.ReadFile(path)
   113  		if err != nil {
   114  			log.Fatal("Unable to read memory driver data", err)
   115  		}
   116  
   117  		releases := []*release.Release{}
   118  		if err := yaml.Unmarshal(b, &releases); err != nil {
   119  			log.Fatal("Unable to unmarshal memory driver data: ", err)
   120  		}
   121  
   122  		for _, rel := range releases {
   123  			if err := store.Create(rel); err != nil {
   124  				log.Fatal(err)
   125  			}
   126  		}
   127  	}
   128  	// Must reset namespace to the proper one
   129  	mem.SetNamespace(settings.Namespace())
   130  }