github.com/GoogleContainerTools/kaniko@v1.23.0/pkg/buildcontext/tar.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  	"compress/gzip"
    21  	"fmt"
    22  	"os"
    23  
    24  	kConfig "github.com/GoogleContainerTools/kaniko/pkg/config"
    25  	"github.com/GoogleContainerTools/kaniko/pkg/util"
    26  	"github.com/pkg/errors"
    27  	"github.com/sirupsen/logrus"
    28  )
    29  
    30  // Tar unifies calls to download and unpack the build context.
    31  type Tar struct {
    32  	context string
    33  }
    34  
    35  // UnpackTarFromBuildContext unpack the compressed tar file
    36  func (t *Tar) UnpackTarFromBuildContext() (string, error) {
    37  	directory := kConfig.BuildContextDir
    38  	if err := os.MkdirAll(directory, 0750); err != nil {
    39  		return "", errors.Wrap(err, "unpacking tar from build context")
    40  	}
    41  	if t.context == "stdin" {
    42  		fi, _ := os.Stdin.Stat()
    43  		if (fi.Mode() & os.ModeCharDevice) != 0 {
    44  			return "", fmt.Errorf("no data found.. don't forget to add the '--interactive, -i' flag")
    45  		}
    46  		logrus.Infof("To simulate EOF and exit, press 'Ctrl+D'")
    47  		// if launched through docker in interactive mode and without piped data
    48  		// process will be stuck here until EOF is sent
    49  		gzr, err := gzip.NewReader(os.Stdin)
    50  		if err != nil {
    51  			return directory, err
    52  		}
    53  		defer gzr.Close()
    54  		_, err = util.UnTar(gzr, directory)
    55  
    56  		return directory, err
    57  
    58  	}
    59  
    60  	return directory, util.UnpackCompressedTar(t.context, directory)
    61  }