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build.go
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build.go
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package oci
import (
"archive/tar"
"bytes"
"compress/gzip"
"context"
"fmt"
"io"
"log"
"path/filepath"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/mutate"
"github.com/google/go-containerregistry/pkg/v1/tarball"
"github.com/henderiw/store"
"github.com/pkg/errors"
)
func Build(files map[string]string) (v1.Image, error) {
// copy files to tarbal
tarBuf := new(bytes.Buffer)
tw := tar.NewWriter(tarBuf)
for fileName, data := range files {
buf := bytes.NewBufferString(data)
hdr := &tar.Header{
Name: fileName,
Mode: int64(0o644),
Size: int64(buf.Len()),
}
if err := tw.WriteHeader(hdr); err != nil {
return nil, err
}
if _, err := io.Copy(tw, buf); err != nil {
return nil, err
}
}
if err := tw.Close(); err != nil {
return nil, err
}
// Build image layer from tarball.
layer, err := tarball.LayerFromOpener(func() (io.ReadCloser, error) {
return io.NopCloser(bytes.NewReader(tarBuf.Bytes())), nil
})
if err != nil {
return nil, err
}
// Append layer to empty image.
return mutate.AppendLayers(Image, layer)
}
func BuildTgz(files map[string]string) ([]byte, error) {
// Create a buffer to store the tar data in memory
tarBuffer := new(bytes.Buffer)
// Create a gzip writer
gzipWriter := gzip.NewWriter(tarBuffer)
defer gzipWriter.Close()
// Create a tar writer
tarWriter := tar.NewWriter(gzipWriter)
defer tarWriter.Close()
// Add files to the tar archive
for fileName, data := range files {
// Create a new tar header
header := &tar.Header{
Name: fileName,
Mode: int64(0o644),
Size: int64(len(data)),
}
// Write the header to the tar archive
if err := tarWriter.WriteHeader(header); err != nil {
return nil, errors.Wrap(err, "cannot write header")
}
// Write the file content to the tar archive
if _, err := tarWriter.Write([]byte(data)); err != nil {
return nil, errors.Wrap(err, "cannot write file content")
}
}
// Finish writing the tar archive
if err := tarWriter.Close(); err != nil {
return nil, errors.Wrap(err, "cannot close tar writer")
}
if err := gzipWriter.Close(); err != nil {
return nil, errors.Wrap(err, "cannot close gzip writer")
}
return tarBuffer.Bytes(), nil
}
func TgzReader(ctx context.Context, r io.Reader, data store.Storer[[]byte]) error {
// Create a gzip reader
gzipReader, err := gzip.NewReader(r)
if err != nil {
return errors.Wrap(err, "cannot create gzip reader")
}
defer gzipReader.Close()
// Create a tar reader
tarReader := tar.NewReader(gzipReader)
// Iterate through the contents of the tar file
for {
header, err := tarReader.Next()
if err == io.EOF {
break // End of archive
}
if err != nil {
return errors.Wrap(err, "error reading tar header")
}
// Print the name of the file or directory
switch header.Typeflag {
case tar.TypeDir:
fmt.Println("dir:", header.Name)
/*
if err := os.Mkdir(header.Name, 0755); err != nil {
log.Fatalf("ExtractTarGz: Mkdir() failed: %s", err.Error())
}
*/
case tar.TypeReg:
// Create a buffer to hold the file content in memory
fmt.Println("Extracting:", header.Name)
fileContent := new(bytes.Buffer)
/*
if err != nil {
log.Fatalf("ExtractTarGz: Create() failed: %s", err.Error())
}
*/
if _, err := io.Copy(fileContent, tarReader); err != nil {
log.Fatalf("ExtractTarGz: Copy() failed: %s", err.Error())
}
//fmt.Println("File Content:")
//fmt.Println(fileContent.String())
data.Create(ctx, store.ToKey(header.Name), fileContent.Bytes())
default:
fmt.Println("unknown:", header.Name, header.Typeflag)
/*
log.Fatalf(
"ExtractTarGz: uknown type: %s in %s",
header.Typeflag,
header.Name)
*/
}
}
return nil
}
func ReadTgz(tgzData []byte) ([]byte, error) {
// Create a reader for the in-memory .tgz data
tgzReader := bytes.NewReader(tgzData)
// Create a gzip reader
gzipReader, err := gzip.NewReader(tgzReader)
if err != nil {
return nil, errors.Wrap(err, "cannot create gzip reader")
}
defer gzipReader.Close()
// Create a tar reader
tarReader := tar.NewReader(gzipReader)
// Iterate through the contents of the tar file
for {
header, err := tarReader.Next()
if err == io.EOF {
break // End of archive
}
if err != nil {
return nil, errors.Wrap(err, "error reading tar header")
}
// Print the name of the file or directory
switch header.Typeflag {
case tar.TypeDir:
fmt.Println("dir:", header.Name)
/*
if err := os.Mkdir(header.Name, 0755); err != nil {
log.Fatalf("ExtractTarGz: Mkdir() failed: %s", err.Error())
}
*/
case tar.TypeReg:
// Create a buffer to hold the file content in memory
fmt.Println("Extracting:", header.Name)
fileContent := new(bytes.Buffer)
/*
if err != nil {
log.Fatalf("ExtractTarGz: Create() failed: %s", err.Error())
}
*/
if _, err := io.Copy(fileContent, tarReader); err != nil {
log.Fatalf("ExtractTarGz: Copy() failed: %s", err.Error())
}
//fmt.Println("File Content:")
//fmt.Println(fileContent.String())
default:
fmt.Println("unknown:", header.Name, header.Typeflag)
/*
log.Fatalf(
"ExtractTarGz: uknown type: %s in %s",
header.Typeflag,
header.Name)
*/
}
// Check if it's a regular file
/*
if header.Typeflag == tar.TypeReg {
// Create a buffer to hold the file content in memory
fileContent := new(bytes.Buffer)
// Copy the file content from the tar archive to the buffer
_, err = io.Copy(fileContent, tarReader)
if err != nil {
return nil, errors.Wrap(err, "error copying file content")
}
}
*/
}
return nil, nil
}
func UnzipTgz(ctx context.Context, basepath string, tgzData []byte, data store.Storer[[]byte]) error {
// Create a reader for the in-memory .tgz data
tgzReader := bytes.NewReader(tgzData)
// Create a gzip reader
gzipReader, err := gzip.NewReader(tgzReader)
if err != nil {
return errors.Wrap(err, "cannot create gzip reader")
}
defer gzipReader.Close()
// Create a tar reader
tarReader := tar.NewReader(gzipReader)
// Iterate through the contents of the tar file
for {
header, err := tarReader.Next()
if err == io.EOF {
break // End of archive
}
if err != nil {
return errors.Wrap(err, "error reading tar header")
}
switch header.Typeflag {
case tar.TypeDir:
fmt.Println("dir:", header.Name)
// TBD need to make dir?
case tar.TypeReg:
// Create a buffer to hold the file content in memory
fmt.Println("Extracting:", header.Name)
fileContent := new(bytes.Buffer)
/*
if err != nil {
log.Fatalf("ExtractTarGz: Create() failed: %s", err.Error())
}
*/
if _, err := io.Copy(fileContent, tarReader); err != nil {
log.Fatalf("ExtractTarGz: Copy() failed: %s", err.Error())
}
data.Create(ctx, store.ToKey(filepath.Join(basepath, header.Name)), fileContent.Bytes())
default:
return fmt.Errorf("unknown type: %s, %b", header.Name, header.Typeflag)
}
}
return nil
}