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package main
import (
"fmt"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/containers/storage"
"github.com/containers/storage/pkg/chrootarchive"
"github.com/containers/storage/pkg/idtools"
"github.com/containers/storage/pkg/mflag"
)
var (
chownOptions = ""
)
func copyContent(flags *mflag.FlagSet, action string, m storage.Store, args []string) int {
var untarIDMappings *idtools.IDMappings
var chownOpts *idtools.IDPair
if len(args) < 1 {
return 1
}
if len(chownOptions) > 0 {
chownParts := strings.SplitN(chownOptions, ":", 2)
if len(chownParts) == 1 {
chownParts = append(chownParts, chownParts[0])
}
uid, err := strconv.ParseUint(chownParts[0], 10, 32)
if err != nil {
fmt.Fprintf(os.Stderr, "error %q as a numeric UID: %v", chownParts[0], err)
return 1
}
gid, err := strconv.ParseUint(chownParts[1], 10, 32)
if err != nil {
fmt.Fprintf(os.Stderr, "error %q as a numeric GID: %v", chownParts[1], err)
return 1
}
chownOpts = &idtools.IDPair{UID: int(uid), GID: int(gid)}
}
target := args[len(args)-1]
if strings.Contains(target, ":") {
targetParts := strings.SplitN(target, ":", 2)
if len(targetParts) != 2 {
fmt.Fprintf(os.Stderr, "error parsing target location %q: only one part\n", target)
return 1
}
targetLayer, err := m.Layer(targetParts[0])
if err != nil {
fmt.Fprintf(os.Stderr, "error finding layer %q: %+v\n", targetParts[0], err)
return 1
}
untarIDMappings = idtools.NewIDMappingsFromMaps(targetLayer.UIDMap, targetLayer.GIDMap)
targetMount, err := m.Mount(targetLayer.ID, targetLayer.MountLabel)
if err != nil {
fmt.Fprintf(os.Stderr, "error mounting layer %q: %+v\n", targetLayer.ID, err)
return 1
}
target = filepath.Join(targetMount, targetParts[1])
defer m.Unmount(targetLayer.ID, false)
}
args = args[:len(args)-1]
for _, srcSpec := range args {
var tarIDMappings *idtools.IDMappings
source := srcSpec
if strings.Contains(source, ":") {
sourceParts := strings.SplitN(source, ":", 2)
if len(sourceParts) != 2 {
fmt.Fprintf(os.Stderr, "error parsing source location %q: only one part\n", source)
return 1
}
sourceLayer, err := m.Layer(sourceParts[0])
if err != nil {
fmt.Fprintf(os.Stderr, "error finding layer %q: %+v\n", sourceParts[0], err)
return 1
}
tarIDMappings = idtools.NewIDMappingsFromMaps(sourceLayer.UIDMap, sourceLayer.GIDMap)
sourceMount, err := m.Mount(sourceLayer.ID, sourceLayer.MountLabel)
if err != nil {
fmt.Fprintf(os.Stderr, "error mounting layer %q: %+v\n", sourceLayer.ID, err)
return 1
}
source = filepath.Join(sourceMount, sourceParts[1])
defer m.Unmount(sourceLayer.ID, false)
}
archiver := chrootarchive.NewArchiverWithChown(tarIDMappings, chownOpts, untarIDMappings)
if err := archiver.CopyWithTar(source, target); err != nil {
fmt.Fprintf(os.Stderr, "error copying %q to %q: %+v\n", source, target, err)
return 1
}
}
return 0
}
func init() {
commands = append(commands, command{
names: []string{"copy"},
usage: "Copy files or directories into a layer, possibly from another layer",
optionsHelp: "[options [...]] [sourceLayerNameOrID:]/path [...] targetLayerNameOrID:/path",
minArgs: 2,
action: copyContent,
addFlags: func(flags *mflag.FlagSet, cmd *command) {
flags.StringVar(&chownOptions, []string{"-chown", ""}, chownOptions, "Set owner on new copies")
flags.BoolVar(&jsonOutput, []string{"-json", "j"}, jsonOutput, "Prefer JSON output")
},
})
}
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