106 lines
2.7 KiB
Go
106 lines
2.7 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package apply
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import (
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"context"
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"fmt"
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"io"
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"os"
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"strings"
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"github.com/containerd/containerd/v2/core/mount"
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"github.com/containerd/containerd/v2/errdefs"
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"github.com/containerd/containerd/v2/pkg/archive"
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"github.com/containerd/containerd/v2/pkg/userns"
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"golang.org/x/sys/unix"
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)
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func apply(ctx context.Context, mounts []mount.Mount, r io.Reader, sync bool) (retErr error) {
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switch {
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case len(mounts) == 1 && mounts[0].Type == "overlay":
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// OverlayConvertWhiteout (mknod c 0 0) doesn't work in userns.
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// https://github.com/containerd/containerd/issues/3762
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if userns.RunningInUserNS() {
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break
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}
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path, parents, err := getOverlayPath(mounts[0].Options)
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if err != nil {
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if errdefs.IsInvalidArgument(err) {
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break
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}
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return err
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}
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opts := []archive.ApplyOpt{
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archive.WithConvertWhiteout(archive.OverlayConvertWhiteout),
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}
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if len(parents) > 0 {
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opts = append(opts, archive.WithParents(parents))
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}
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_, err = archive.Apply(ctx, path, r, opts...)
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if err == nil && sync {
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err = doSyncFs(path)
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}
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return err
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case sync && len(mounts) == 1 && mounts[0].Type == "bind":
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defer func() {
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if retErr != nil {
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return
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}
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retErr = doSyncFs(mounts[0].Source)
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}()
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}
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return mount.WithTempMount(ctx, mounts, func(root string) error {
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_, err := archive.Apply(ctx, root, r)
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return err
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})
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}
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func getOverlayPath(options []string) (upper string, lower []string, err error) {
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const upperdirPrefix = "upperdir="
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const lowerdirPrefix = "lowerdir="
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for _, o := range options {
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if strings.HasPrefix(o, upperdirPrefix) {
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upper = strings.TrimPrefix(o, upperdirPrefix)
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} else if strings.HasPrefix(o, lowerdirPrefix) {
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lower = strings.Split(strings.TrimPrefix(o, lowerdirPrefix), ":")
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}
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}
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if upper == "" {
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return "", nil, fmt.Errorf("upperdir not found: %w", errdefs.ErrInvalidArgument)
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}
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return
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}
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func doSyncFs(file string) error {
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fd, err := os.Open(file)
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if err != nil {
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return fmt.Errorf("failed to open %s: %w", file, err)
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}
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defer fd.Close()
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_, _, errno := unix.Syscall(unix.SYS_SYNCFS, fd.Fd(), 0, 0)
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if errno != 0 {
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return fmt.Errorf("failed to syncfs for %s: %w", file, errno)
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}
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return nil
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}
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