/
apply_linux.go
77 lines (67 loc) · 2.13 KB
/
apply_linux.go
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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package apply
import (
"context"
"fmt"
"io"
"strings"
"github.com/containerd/containerd/archive"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/mount"
"github.com/containerd/containerd/pkg/userns"
)
func apply(ctx context.Context, mounts []mount.Mount, r io.Reader) error {
switch {
case len(mounts) == 1 && mounts[0].Type == "overlay":
// OverlayConvertWhiteout (mknod c 0 0) doesn't work in userns.
// https://github.com/containerd/containerd/issues/3762
if userns.RunningInUserNS() {
break
}
path, parents, err := getOverlayPath(mounts[0].Options)
if err != nil {
if errdefs.IsInvalidArgument(err) {
break
}
return err
}
opts := []archive.ApplyOpt{
archive.WithConvertWhiteout(archive.OverlayConvertWhiteout),
}
if len(parents) > 0 {
opts = append(opts, archive.WithParents(parents))
}
_, err = archive.Apply(ctx, path, r, opts...)
return err
}
return mount.WithTempMount(ctx, mounts, func(root string) error {
_, err := archive.Apply(ctx, root, r)
return err
})
}
func getOverlayPath(options []string) (upper string, lower []string, err error) {
const upperdirPrefix = "upperdir="
const lowerdirPrefix = "lowerdir="
for _, o := range options {
if strings.HasPrefix(o, upperdirPrefix) {
upper = strings.TrimPrefix(o, upperdirPrefix)
} else if strings.HasPrefix(o, lowerdirPrefix) {
lower = strings.Split(strings.TrimPrefix(o, lowerdirPrefix), ":")
}
}
if upper == "" {
return "", nil, fmt.Errorf("upperdir not found: %w", errdefs.ErrInvalidArgument)
}
return
}