github.com/GoogleContainerTools/skaffold@v1.39.18/pkg/skaffold/sync/docker.go (about)

     1  /*
     2  Copyright 2021 The Skaffold 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 sync
    18  
    19  import (
    20  	"context"
    21  	"fmt"
    22  	"io"
    23  	"os/exec"
    24  
    25  	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/output/log"
    26  	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/util"
    27  )
    28  
    29  type ContainerSyncer struct{}
    30  
    31  func NewContainerSyncer() *ContainerSyncer {
    32  	return &ContainerSyncer{}
    33  }
    34  
    35  func (s *ContainerSyncer) Sync(ctx context.Context, _ io.Writer, item *Item) error {
    36  	if len(item.Copy) > 0 {
    37  		log.Entry(ctx).Info("Copying files:", item.Copy, "to", item.Image)
    38  		if _, err := util.RunCmdOut(ctx, s.copyFileFn(ctx, item.Artifact.ImageName, item.Copy)); err != nil {
    39  			return fmt.Errorf("copying files: %w", err)
    40  		}
    41  	}
    42  
    43  	if len(item.Delete) > 0 {
    44  		log.Entry(ctx).Info("Deleting files:", item.Delete, "from", item.Image)
    45  		if _, err := util.RunCmdOut(ctx, s.deleteFileFn(ctx, item.Artifact.ImageName, item.Delete)); err != nil {
    46  			return fmt.Errorf("deleting files: %w", err)
    47  		}
    48  	}
    49  
    50  	return nil
    51  }
    52  
    53  func (s *ContainerSyncer) deleteFileFn(ctx context.Context, containerName string, files syncMap) *exec.Cmd {
    54  	var args []string
    55  	args = append(args, "exec", "-i", containerName, "rm", "-rf", "--")
    56  	for _, dsts := range files {
    57  		args = append(args, dsts...)
    58  	}
    59  	return exec.CommandContext(ctx, "docker", args...)
    60  }
    61  
    62  func (s *ContainerSyncer) copyFileFn(ctx context.Context, containerName string, files syncMap) *exec.Cmd {
    63  	reader, writer := io.Pipe()
    64  	go func() {
    65  		if err := util.CreateMappedTar(writer, "/", files); err != nil {
    66  			writer.CloseWithError(err)
    67  		} else {
    68  			writer.Close()
    69  		}
    70  	}()
    71  
    72  	copyCmd := exec.CommandContext(ctx, "docker", "exec", "-i", containerName, "tar", "xmf", "-", "-C", "/", "--no-same-owner")
    73  	copyCmd.Stdin = reader
    74  	return copyCmd
    75  }