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writer.go
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writer.go
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package aci
import (
"archive/tar"
"bytes"
"encoding/json"
"io"
"strings"
"time"
"github.com/coreos/rocket/app-container/schema"
)
// ArchiveWriter writes App Container Images. Users wanting to create an ACI or
// Fileset ACI should create an ArchiveWriter and add files to it; the ACI will
// be written to the underlying tar.Writer
type ArchiveWriter interface {
AddFile(path string, hdr *tar.Header, r io.Reader) error
Close() error
}
type appArchiveWriter struct {
*tar.Writer
am *schema.AppManifest
}
type fsArchiveWriter struct {
appArchiveWriter
fsm *schema.FilesetManifest
}
// NewAppWriter creates a new ArchiveWriter which will generate an App
// Container Image based on the given manifest and write it to the given
// tar.Writer
func NewAppWriter(am schema.AppManifest, w *tar.Writer) ArchiveWriter {
aw := &appArchiveWriter{
w,
&am,
}
return aw
}
// NewFilesetWriter creates a new ArchiveWriter which will generate a Fileset
// ACI by the given name and write it to the given tar.Writer.
func NewFilesetWriter(name string, w *tar.Writer) (ArchiveWriter, error) {
fsm, err := schema.NewFilesetManifest(name)
if err != nil {
return nil, err
}
aw := &fsArchiveWriter{
appArchiveWriter{
w,
nil,
},
fsm,
}
return aw, nil
}
func (aw *appArchiveWriter) AddFile(path string, hdr *tar.Header, r io.Reader) error {
err := aw.Writer.WriteHeader(hdr)
if err != nil {
return err
}
if r != nil {
_, err := io.Copy(aw.Writer, r)
if err != nil {
return err
}
}
return nil
}
func (aw *fsArchiveWriter) AddFile(path string, hdr *tar.Header, r io.Reader) error {
relpath := strings.TrimPrefix(path, "rootfs")
if relpath != "/" {
aw.fsm.Files = append(aw.fsm.Files, relpath)
}
return aw.appArchiveWriter.AddFile(path, hdr, r)
}
func (aw *appArchiveWriter) addFileNow(path string, contents []byte) error {
buf := bytes.NewBuffer(contents)
now := time.Now()
hdr := tar.Header{
Name: path,
Mode: 0655,
Uid: 0,
Gid: 0,
Size: int64(buf.Len()),
ModTime: now,
Typeflag: tar.TypeReg,
Uname: "root",
Gname: "root",
ChangeTime: now,
}
return aw.AddFile(path, &hdr, buf)
}
func (aw *appArchiveWriter) addManifest(name string, m json.Marshaler) error {
out, err := m.MarshalJSON()
if err != nil {
return err
}
return aw.addFileNow(name, out)
}
func (aw *appArchiveWriter) Close() error {
if err := aw.addManifest("app", aw.am); err != nil {
return err
}
return aw.Writer.Close()
}
func (aw *fsArchiveWriter) Close() error {
if err := aw.addManifest("fileset", aw.fsm); err != nil {
return err
}
return aw.Writer.Close()
}