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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, error) {
var untarIDMappings *idtools.IDMappings
var chownOpts *idtools.IDPair
if len(args) < 1 {
return 1, nil
}
if len(chownOptions) > 0 {
uidStr, gidStr, ok := strings.Cut(chownOptions, ":")
if !ok {
gidStr = uidStr
}
uid, err := strconv.ParseUint(uidStr, 10, 32)
if err != nil {
return 1, fmt.Errorf("bad UID: %w", err)
}
gid, err := strconv.ParseUint(gidStr, 10, 32)
if err != nil {
return 1, fmt.Errorf("bad GID: %w", err)
}
chownOpts = &idtools.IDPair{UID: int(uid), GID: int(gid)}
}
target := args[len(args)-1]
if strings.Contains(target, ":") {
layer, targetRel, ok := strings.Cut(target, ":")
if !ok {
return 1, fmt.Errorf("error parsing target location %q: only one part", target)
}
targetLayer, err := m.Layer(layer)
if err != nil {
return 1, fmt.Errorf("error finding layer %q: %+v", layer, err)
}
untarIDMappings = idtools.NewIDMappingsFromMaps(targetLayer.UIDMap, targetLayer.GIDMap)
targetMount, err := m.Mount(targetLayer.ID, targetLayer.MountLabel)
if err != nil {
return 1, fmt.Errorf("error mounting layer %q: %+v", targetLayer.ID, err)
}
target = filepath.Join(targetMount, targetRel)
defer func() {
if _, err := m.Unmount(targetLayer.ID, false); err != nil {
fmt.Fprintf(os.Stderr, "error unmounting layer %q: %+v\n", targetLayer.ID, err)
// Does not change the exit code
}
}()
}
args = args[:len(args)-1]
for _, srcSpec := range args {
var tarIDMappings *idtools.IDMappings
source := srcSpec
if layer, sourceRel, ok := strings.Cut(source, ":"); ok {
sourceLayer, err := m.Layer(layer)
if err != nil {
return 1, fmt.Errorf("error finding layer %q: %+v", layer, err)
}
tarIDMappings = idtools.NewIDMappingsFromMaps(sourceLayer.UIDMap, sourceLayer.GIDMap)
sourceMount, err := m.Mount(sourceLayer.ID, sourceLayer.MountLabel)
if err != nil {
return 1, fmt.Errorf("error mounting layer %q: %+v", sourceLayer.ID, err)
}
source = filepath.Join(sourceMount, sourceRel)
defer func() {
if _, err := m.Unmount(sourceLayer.ID, false); err != nil {
fmt.Fprintf(os.Stderr, "error unmounting layer %q: %+v\n", sourceLayer.ID, err)
// Does not change the exit code
}
}()
}
archiver := chrootarchive.NewArchiverWithChown(tarIDMappings, chownOpts, untarIDMappings)
if err := archiver.CopyWithTar(source, target); err != nil {
return 1, fmt.Errorf("error copying %q to %q: %+v", source, target, err)
}
}
return 0, nil
}
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,
maxArgs: -1,
action: copyContent,
addFlags: func(flags *mflag.FlagSet, cmd *command) {
flags.StringVar(&chownOptions, []string{"-chown", "o"}, chownOptions, "Set owner on new copies")
flags.BoolVar(&jsonOutput, []string{"-json", "j"}, jsonOutput, "Prefer JSON output")
},
})
}
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