/
tarImage.go
62 lines (58 loc) · 1.32 KB
/
tarImage.go
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package main
import (
"bufio"
"compress/gzip"
"fmt"
"io"
"os"
"github.com/Cloud-Foundations/Dominator/lib/filesystem/tar"
"github.com/Cloud-Foundations/Dominator/lib/log"
objectclient "github.com/Cloud-Foundations/Dominator/lib/objectserver/client"
)
func tarImageSubcommand(args []string, logger log.DebugLogger) error {
_, objectClient := getClients()
outputFilename := ""
if len(args) > 1 {
outputFilename = args[1]
}
err := tarImageAndWrite(objectClient, args[0], outputFilename)
if err != nil {
return fmt.Errorf("Error taring image: %s", err)
}
return nil
}
func tarImageAndWrite(objectClient *objectclient.ObjectClient, imageName,
outputFilename string) error {
fs, objectsGetter, err := getImageForUnpack(objectClient, imageName)
if err != nil {
return err
}
deleteOutfile := true
output := io.Writer(os.Stdout)
if outputFilename != "" {
var err error
file, err := os.Create(outputFilename)
if err != nil {
return err
}
writer := bufio.NewWriter(file)
output = writer
defer func() {
writer.Flush()
file.Close()
if deleteOutfile {
os.Remove(outputFilename)
}
}()
}
if *compress {
zWriter := gzip.NewWriter(output)
defer zWriter.Close()
output = zWriter
}
if err := tar.Write(output, fs, objectsGetter); err != nil {
return err
}
deleteOutfile = false
return nil
}