github.com/tilt-dev/tilt@v0.36.0/internal/k8s/kubeconfig/writer.go (about)

     1  package kubeconfig
     2  
     3  import (
     4  	"context"
     5  	"fmt"
     6  	"os"
     7  	"path/filepath"
     8  
     9  	"github.com/spf13/afero"
    10  	"k8s.io/apimachinery/pkg/types"
    11  	"k8s.io/cli-runtime/pkg/printers"
    12  	"k8s.io/client-go/tools/clientcmd/api"
    13  	"k8s.io/client-go/tools/clientcmd/api/latest"
    14  
    15  	"github.com/tilt-dev/tilt/internal/xdg"
    16  	"github.com/tilt-dev/tilt/pkg/model"
    17  )
    18  
    19  type Writer struct {
    20  	base          xdg.Base
    21  	filesystem    afero.Fs
    22  	apiServerName model.APIServerName
    23  }
    24  
    25  func NewWriter(base xdg.Base, filesystem afero.Fs, apiServerName model.APIServerName) *Writer {
    26  	return &Writer{
    27  		base:          base,
    28  		filesystem:    filesystem,
    29  		apiServerName: apiServerName,
    30  	}
    31  }
    32  
    33  func (w *Writer) openFrozenKubeConfigFile(ctx context.Context, nn types.NamespacedName) (string, afero.File, error) {
    34  	path, err := w.base.RuntimeFile(
    35  		filepath.Join(string(w.apiServerName), "cluster", fmt.Sprintf("%s.yml", nn.Name)))
    36  	if err == nil {
    37  		var f afero.File
    38  		f, err = w.filesystem.OpenFile(path, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0600)
    39  		if err == nil {
    40  			return path, f, nil
    41  		}
    42  	}
    43  
    44  	path, err = w.base.StateFile(
    45  		filepath.Join(string(w.apiServerName), "cluster", fmt.Sprintf("%s.yml", nn.Name)))
    46  	if err != nil {
    47  		return "", nil, fmt.Errorf("storing temp kubeconfigs: %v", err)
    48  	}
    49  
    50  	f, err := w.filesystem.OpenFile(path, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0600)
    51  	if err != nil {
    52  		return "", nil, fmt.Errorf("storing temp kubeconfigs: %v", err)
    53  	}
    54  	return path, f, nil
    55  }
    56  
    57  func (w *Writer) WriteFrozenKubeConfig(ctx context.Context, nn types.NamespacedName, config *api.Config) (string, error) {
    58  	config = config.DeepCopy()
    59  	err := api.MinifyConfig(config)
    60  	if err != nil {
    61  		return "", fmt.Errorf("minifying Kubernetes config: %v", err)
    62  	}
    63  
    64  	err = api.FlattenConfig(config)
    65  	if err != nil {
    66  		return "", fmt.Errorf("flattening Kubernetes config: %v", err)
    67  	}
    68  
    69  	obj, err := latest.Scheme.ConvertToVersion(config, latest.ExternalVersion)
    70  	if err != nil {
    71  		return "", fmt.Errorf("converting Kubernetes config: %v", err)
    72  	}
    73  
    74  	printer := printers.YAMLPrinter{}
    75  	path, f, err := w.openFrozenKubeConfigFile(ctx, nn)
    76  	if err != nil {
    77  		return "", err
    78  	}
    79  	defer func() {
    80  		_ = f.Close()
    81  	}()
    82  
    83  	err = printer.PrintObj(obj, f)
    84  	if err != nil {
    85  		return "", fmt.Errorf("writing kubeconfig: %v", err)
    86  	}
    87  	return path, nil
    88  }