129 lines
4.1 KiB
Go
129 lines
4.1 KiB
Go
//go:build !windows
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package daemon // import "github.com/docker/docker/daemon"
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import (
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"context"
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"fmt"
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"os"
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"path/filepath"
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"github.com/containerd/log"
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containertypes "github.com/docker/docker/api/types/container"
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mounttypes "github.com/docker/docker/api/types/mount"
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"github.com/docker/docker/container"
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"github.com/docker/docker/errdefs"
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"github.com/docker/docker/internal/compatcontext"
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"github.com/docker/docker/oci"
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volumemounts "github.com/docker/docker/volume/mounts"
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volumeopts "github.com/docker/docker/volume/service/opts"
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"github.com/opencontainers/selinux/go-selinux/label"
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"github.com/pkg/errors"
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)
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// createContainerOSSpecificSettings performs host-OS specific container create functionality
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func (daemon *Daemon) createContainerOSSpecificSettings(ctx context.Context, container *container.Container, config *containertypes.Config, hostConfig *containertypes.HostConfig) error {
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if err := daemon.Mount(container); err != nil {
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return err
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}
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defer daemon.Unmount(container)
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rootIDs := daemon.idMapping.RootPair()
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if err := container.SetupWorkingDirectory(rootIDs); err != nil {
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return err
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}
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// Set the default masked and readonly paths with regard to the host config options if they are not set.
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if hostConfig.MaskedPaths == nil && !hostConfig.Privileged {
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hostConfig.MaskedPaths = oci.DefaultSpec().Linux.MaskedPaths // Set it to the default if nil
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container.HostConfig.MaskedPaths = hostConfig.MaskedPaths
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}
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if hostConfig.ReadonlyPaths == nil && !hostConfig.Privileged {
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hostConfig.ReadonlyPaths = oci.DefaultSpec().Linux.ReadonlyPaths // Set it to the default if nil
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container.HostConfig.ReadonlyPaths = hostConfig.ReadonlyPaths
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}
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for spec := range config.Volumes {
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destination := filepath.Clean(spec)
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// Skip volumes for which we already have something mounted on that
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// destination because of a --volume-from.
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if container.HasMountFor(destination) {
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log.G(ctx).WithField("container", container.ID).WithField("destination", spec).Debug("mountpoint already exists, skipping anonymous volume")
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// Not an error, this could easily have come from the image config.
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continue
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}
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path, err := container.GetResourcePath(destination)
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if err != nil {
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return err
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}
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stat, err := os.Stat(path)
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if err == nil && !stat.IsDir() {
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return fmt.Errorf("cannot mount volume over existing file, file exists %s", path)
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}
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v, err := daemon.volumes.Create(context.TODO(), "", hostConfig.VolumeDriver, volumeopts.WithCreateReference(container.ID))
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if err != nil {
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return err
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}
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if err := label.Relabel(v.Mountpoint, container.MountLabel, true); err != nil {
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return err
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}
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container.AddMountPointWithVolume(destination, &volumeWrapper{v: v, s: daemon.volumes}, true)
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}
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return daemon.populateVolumes(ctx, container)
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}
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// populateVolumes copies data from the container's rootfs into the volume for non-binds.
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// this is only called when the container is created.
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func (daemon *Daemon) populateVolumes(ctx context.Context, c *container.Container) error {
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for _, mnt := range c.MountPoints {
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if mnt.Volume == nil {
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continue
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}
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if mnt.Type != mounttypes.TypeVolume || !mnt.CopyData {
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continue
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}
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if err := daemon.populateVolume(ctx, c, mnt); err != nil {
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return err
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}
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}
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return nil
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}
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func (daemon *Daemon) populateVolume(ctx context.Context, c *container.Container, mnt *volumemounts.MountPoint) error {
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ctrDestPath, err := c.GetResourcePath(mnt.Destination)
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if err != nil {
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return err
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}
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if _, err := os.Stat(ctrDestPath); err != nil {
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if os.IsNotExist(err) {
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return nil
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}
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return err
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}
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volumePath, cleanup, err := mnt.Setup(ctx, c.MountLabel, daemon.idMapping.RootPair(), nil)
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if err != nil {
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if errdefs.IsNotFound(err) {
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return nil
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}
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log.G(ctx).WithError(err).Debugf("can't copy data from %s:%s, to %s", c.ID, mnt.Destination, volumePath)
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return errors.Wrapf(err, "failed to populate volume")
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}
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defer mnt.Cleanup(compatcontext.WithoutCancel(ctx))
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defer cleanup(compatcontext.WithoutCancel(ctx))
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log.G(ctx).Debugf("copying image data from %s:%s, to %s", c.ID, mnt.Destination, volumePath)
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if err := c.CopyImagePathContent(volumePath, ctrDestPath); err != nil {
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return err
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}
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return nil
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}
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