github.com/GoogleContainerTools/kaniko@v1.23.0/pkg/buildcontext/s3.go (about)

     1  /*
     2  Copyright 2018 Google LLC
     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 buildcontext
    18  
    19  import (
    20  	"context"
    21  	"fmt"
    22  	"os"
    23  	"path/filepath"
    24  	"strings"
    25  
    26  	kConfig "github.com/GoogleContainerTools/kaniko/pkg/config"
    27  	"github.com/GoogleContainerTools/kaniko/pkg/constants"
    28  	"github.com/GoogleContainerTools/kaniko/pkg/util"
    29  	"github.com/GoogleContainerTools/kaniko/pkg/util/bucket"
    30  	"github.com/aws/aws-sdk-go-v2/aws"
    31  	"github.com/aws/aws-sdk-go-v2/config"
    32  	s3manager "github.com/aws/aws-sdk-go-v2/feature/s3/manager"
    33  	"github.com/aws/aws-sdk-go-v2/service/s3"
    34  )
    35  
    36  // S3 unifies calls to download and unpack the build context.
    37  type S3 struct {
    38  	context string
    39  }
    40  
    41  // UnpackTarFromBuildContext download and untar a file from s3
    42  func (s *S3) UnpackTarFromBuildContext() (string, error) {
    43  	bucket, item, err := bucket.GetNameAndFilepathFromURI(s.context)
    44  	if err != nil {
    45  		return "", fmt.Errorf("getting bucketname and filepath from context: %w", err)
    46  	}
    47  
    48  	endpoint := os.Getenv(constants.S3EndpointEnv)
    49  	forcePath := false
    50  	if strings.ToLower(os.Getenv(constants.S3ForcePathStyle)) == "true" {
    51  		forcePath = true
    52  	}
    53  
    54  	customResolver := aws.EndpointResolverWithOptionsFunc(func(service, region string, options ...interface{}) (aws.Endpoint, error) {
    55  		if endpoint != "" {
    56  			return aws.Endpoint{
    57  				URL: endpoint,
    58  			}, nil
    59  		}
    60  		return aws.Endpoint{}, &aws.EndpointNotFoundError{}
    61  	})
    62  
    63  	cfg, err := config.LoadDefaultConfig(context.TODO(), config.WithEndpointResolverWithOptions(customResolver))
    64  	if err != nil {
    65  		return bucket, err
    66  	}
    67  	client := s3.NewFromConfig(cfg, func(options *s3.Options) {
    68  		if endpoint != "" {
    69  			options.UsePathStyle = forcePath
    70  		}
    71  	})
    72  	downloader := s3manager.NewDownloader(client)
    73  	directory := kConfig.BuildContextDir
    74  	tarPath := filepath.Join(directory, constants.ContextTar)
    75  	if err := os.MkdirAll(directory, 0750); err != nil {
    76  		return directory, err
    77  	}
    78  	file, err := os.Create(tarPath)
    79  	if err != nil {
    80  		return directory, err
    81  	}
    82  	_, err = downloader.Download(context.TODO(), file,
    83  		&s3.GetObjectInput{
    84  			Bucket: aws.String(bucket),
    85  			Key:    aws.String(item),
    86  		})
    87  	if err != nil {
    88  		return directory, err
    89  	}
    90  
    91  	return directory, util.UnpackCompressedTar(tarPath, directory)
    92  }