/
ignition.go
41 lines (34 loc) · 1014 Bytes
/
ignition.go
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package isoeditor
import (
"bytes"
"compress/gzip"
"github.com/cavaliercoder/go-cpio"
"github.com/pkg/errors"
)
type IgnitionContent struct {
Config []byte
}
func (ic *IgnitionContent) Archive() (*bytes.Reader, error) {
// Run gzip compression
compressedBuffer := new(bytes.Buffer)
gzipWriter := gzip.NewWriter(compressedBuffer)
// Create CPIO archive
cpioWriter := cpio.NewWriter(gzipWriter)
if err := cpioWriter.WriteHeader(&cpio.Header{
Name: "config.ign",
Mode: 0o100_644,
Size: int64(len(ic.Config)),
}); err != nil {
return nil, errors.Wrap(err, "Failed to write CPIO header")
}
if _, err := cpioWriter.Write(ic.Config); err != nil {
return nil, errors.Wrap(err, "Failed to write CPIO archive")
}
if err := cpioWriter.Close(); err != nil {
return nil, errors.Wrap(err, "Failed to close CPIO archive")
}
if err := gzipWriter.Close(); err != nil {
return nil, errors.Wrap(err, "Failed to gzip ignition config")
}
return bytes.NewReader(compressedBuffer.Bytes()), nil
}