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package buildah
import (
"archive/tar"
"io"
"os"
"sync"
"github.com/containers/image/docker/reference"
"github.com/containers/image/pkg/sysregistries"
"github.com/containers/image/types"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/chrootarchive"
"github.com/containers/storage/pkg/idtools"
"github.com/containers/storage/pkg/reexec"
rspec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
)
// InitReexec is a wrapper for reexec.Init(). It should be called at
// the start of main(), and if it returns true, main() should return
// immediately.
func InitReexec() bool {
return reexec.Init()
}
func copyStringStringMap(m map[string]string) map[string]string {
n := map[string]string{}
for k, v := range m {
n[k] = v
}
return n
}
func copyStringSlice(s []string) []string {
t := make([]string, len(s))
copy(t, s)
return t
}
func convertStorageIDMaps(UIDMap, GIDMap []idtools.IDMap) ([]rspec.LinuxIDMapping, []rspec.LinuxIDMapping) {
uidmap := make([]rspec.LinuxIDMapping, 0, len(UIDMap))
gidmap := make([]rspec.LinuxIDMapping, 0, len(GIDMap))
for _, m := range UIDMap {
uidmap = append(uidmap, rspec.LinuxIDMapping{
HostID: uint32(m.HostID),
ContainerID: uint32(m.ContainerID),
Size: uint32(m.Size),
})
}
for _, m := range GIDMap {
gidmap = append(gidmap, rspec.LinuxIDMapping{
HostID: uint32(m.HostID),
ContainerID: uint32(m.ContainerID),
Size: uint32(m.Size),
})
}
return uidmap, gidmap
}
func convertRuntimeIDMaps(UIDMap, GIDMap []rspec.LinuxIDMapping) ([]idtools.IDMap, []idtools.IDMap) {
uidmap := make([]idtools.IDMap, 0, len(UIDMap))
gidmap := make([]idtools.IDMap, 0, len(GIDMap))
for _, m := range UIDMap {
uidmap = append(uidmap, idtools.IDMap{
HostID: int(m.HostID),
ContainerID: int(m.ContainerID),
Size: int(m.Size),
})
}
for _, m := range GIDMap {
gidmap = append(gidmap, idtools.IDMap{
HostID: int(m.HostID),
ContainerID: int(m.ContainerID),
Size: int(m.Size),
})
}
return uidmap, gidmap
}
// copyFileWithTar returns a function which copies a single file from outside
// of any container into our working container, mapping permissions using the
// container's ID maps, possibly overridden using the passed-in chownOpts
func (b *Builder) copyFileWithTar(chownOpts *idtools.IDPair, hasher io.Writer) func(src, dest string) error {
convertedUIDMap, convertedGIDMap := convertRuntimeIDMaps(b.IDMappingOptions.UIDMap, b.IDMappingOptions.GIDMap)
untarMappings := idtools.NewIDMappingsFromMaps(convertedUIDMap, convertedGIDMap)
archiver := chrootarchive.NewArchiverWithChown(nil, chownOpts, untarMappings)
if hasher != nil {
originalUntar := archiver.Untar
archiver.Untar = func(tarArchive io.Reader, dest string, options *archive.TarOptions) error {
contentReader, contentWriter, err := os.Pipe()
if err != nil {
return err
}
defer contentReader.Close()
defer contentWriter.Close()
var hashError error
var hashWorker sync.WaitGroup
hashWorker.Add(1)
go func() {
t := tar.NewReader(contentReader)
_, err := t.Next()
if err != nil {
hashError = err
}
if _, err = io.Copy(hasher, t); err != nil && err != io.EOF {
hashError = err
}
hashWorker.Done()
}()
err = originalUntar(io.TeeReader(tarArchive, contentWriter), dest, options)
hashWorker.Wait()
if err == nil {
err = hashError
}
return err
}
}
return archiver.CopyFileWithTar
}
// copyWithTar returns a function which copies a directory tree from outside of
// any container into our working container, mapping permissions using the
// container's ID maps, possibly overridden using the passed-in chownOpts
func (b *Builder) copyWithTar(chownOpts *idtools.IDPair, hasher io.Writer) func(src, dest string) error {
convertedUIDMap, convertedGIDMap := convertRuntimeIDMaps(b.IDMappingOptions.UIDMap, b.IDMappingOptions.GIDMap)
untarMappings := idtools.NewIDMappingsFromMaps(convertedUIDMap, convertedGIDMap)
archiver := chrootarchive.NewArchiverWithChown(nil, chownOpts, untarMappings)
if hasher != nil {
originalUntar := archiver.Untar
archiver.Untar = func(tarArchive io.Reader, dest string, options *archive.TarOptions) error {
return originalUntar(io.TeeReader(tarArchive, hasher), dest, options)
}
}
return archiver.CopyWithTar
}
// untarPath returns a function which extracts an archive in a specified
// location into our working container, mapping permissions using the
// container's ID maps, possibly overridden using the passed-in chownOpts
func (b *Builder) untarPath(chownOpts *idtools.IDPair, hasher io.Writer) func(src, dest string) error {
convertedUIDMap, convertedGIDMap := convertRuntimeIDMaps(b.IDMappingOptions.UIDMap, b.IDMappingOptions.GIDMap)
untarMappings := idtools.NewIDMappingsFromMaps(convertedUIDMap, convertedGIDMap)
archiver := chrootarchive.NewArchiverWithChown(nil, chownOpts, untarMappings)
if hasher != nil {
originalUntar := archiver.Untar
archiver.Untar = func(tarArchive io.Reader, dest string, options *archive.TarOptions) error {
return originalUntar(io.TeeReader(tarArchive, hasher), dest, options)
}
}
return archiver.UntarPath
}
// tarPath returns a function which creates an archive of a specified
// location in the container's filesystem, mapping permissions using the
// container's ID maps
func (b *Builder) tarPath() func(path string) (io.ReadCloser, error) {
convertedUIDMap, convertedGIDMap := convertRuntimeIDMaps(b.IDMappingOptions.UIDMap, b.IDMappingOptions.GIDMap)
tarMappings := idtools.NewIDMappingsFromMaps(convertedUIDMap, convertedGIDMap)
return func(path string) (io.ReadCloser, error) {
return archive.TarWithOptions(path, &archive.TarOptions{
Compression: archive.Uncompressed,
UIDMaps: tarMappings.UIDs(),
GIDMaps: tarMappings.GIDs(),
})
}
}
// getRegistries obtains the list of registries defined in the global registries file.
func getRegistries(sc *types.SystemContext) ([]string, error) {
searchRegistries, err := sysregistries.GetRegistries(sc)
if err != nil {
return nil, errors.Wrapf(err, "unable to parse the registries.conf file")
}
return searchRegistries, nil
}
// hasRegistry returns a bool/err response if the image has a registry in its
// name
func hasRegistry(imageName string) (bool, error) {
imgRef, err := reference.Parse(imageName)
if err != nil {
return false, err
}
registry := reference.Domain(imgRef.(reference.Named))
if registry != "" {
return true, nil
}
return false, nil
}
|
