buildah/util.go

package buildah

import (
	"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"
)

var (
	// CopyWithTar defines the copy method to use.
	copyWithTar     = chrootarchive.NewArchiver(nil).CopyWithTar
	copyFileWithTar = chrootarchive.NewArchiver(nil).CopyFileWithTar
	untarPath       = chrootarchive.NewArchiver(nil).UntarPath
)

// 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
}