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//go:build !windows
// +build !windows
package chrootarchive // import "github.com/docker/docker/pkg/chrootarchive"
import (
"io"
"path/filepath"
"github.com/containerd/containerd/pkg/userns"
"github.com/docker/docker/pkg/archive"
"golang.org/x/sys/unix"
)
// applyLayerHandler parses a diff in the standard layer format from `layer`, and
// applies it to the directory `dest`. Returns the size in bytes of the
// contents of the layer.
func applyLayerHandler(dest string, layer io.Reader, options *archive.TarOptions, decompress bool) (size int64, err error) {
dest = filepath.Clean(dest)
if decompress {
decompressed, err := archive.DecompressStream(layer)
if err != nil {
return 0, err
}
defer decompressed.Close()
layer = decompressed
}
if options == nil {
options = &archive.TarOptions{}
}
if userns.RunningInUserNS() {
options.InUserNS = true
}
if options.ExcludePatterns == nil {
options.ExcludePatterns = []string{}
}
type result struct {
layerSize int64
err error
}
done := make(chan result)
err = goInChroot(dest, func() {
// We need to be able to set any perms
_ = unix.Umask(0)
size, err := archive.UnpackLayer("/", layer, options)
done <- result{layerSize: size, err: err}
})
if err != nil {
return 0, err
}
res := <-done
return res.layerSize, res.err
}
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