Move volumes out of container.go and into volumes.go
This helps clean up the container file and move volumes into one location. We currently cannot move volumes to a sub pkg because they depend on Container and also modify fields on the container. Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
This commit is contained in:
Michael Crosby
parent
6dd1bb9eb0
commit
bd54d40f68
308
container.go
308
container.go
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@ -9,7 +9,6 @@ import (
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"github.com/dotcloud/docker/execdriver"
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"github.com/dotcloud/docker/graphdriver"
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"github.com/dotcloud/docker/nat"
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"github.com/dotcloud/docker/pkg/mount"
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"github.com/dotcloud/docker/pkg/term"
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"github.com/dotcloud/docker/runconfig"
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"github.com/dotcloud/docker/utils"
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@ -19,7 +18,6 @@ import (
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"log"
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"os"
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"path"
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"path/filepath"
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"strings"
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"sync"
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"syscall"
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@ -27,8 +25,10 @@ import (
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)
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var (
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ErrNotATTY = errors.New("The PTY is not a file")
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ErrNoTTY = errors.New("No PTY found")
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ErrNotATTY = errors.New("The PTY is not a file")
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ErrNoTTY = errors.New("No PTY found")
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ErrContainerStart = errors.New("The container failed to start. Unknown error")
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ErrContainerStartTimeout = errors.New("The container failed to start due to timed out.")
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)
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type Container struct {
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@ -74,17 +74,6 @@ type Container struct {
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activeLinks map[string]*Link
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}
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type BindMap struct {
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SrcPath string
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DstPath string
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Mode string
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}
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var (
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ErrContainerStart = errors.New("The container failed to start. Unknown error")
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ErrContainerStartTimeout = errors.New("The container failed to start due to timed out.")
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)
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// FIXME: move deprecated port stuff to nat to clean up the core.
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type PortMapping map[string]string // Deprecated
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@ -503,17 +492,7 @@ func (container *Container) Start() (err error) {
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log.Printf("WARNING: IPv4 forwarding is disabled. Networking will not work")
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}
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if container.Volumes == nil || len(container.Volumes) == 0 {
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container.Volumes = make(map[string]string)
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container.VolumesRW = make(map[string]bool)
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}
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// Apply volumes from another container if requested
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if err := container.applyExternalVolumes(); err != nil {
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return err
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}
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if err := container.createVolumes(); err != nil {
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if err := prepareVolumesForContainer(container); err != nil {
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return err
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}
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@ -587,62 +566,10 @@ func (container *Container) Start() (err error) {
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return err
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}
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// Setup the root fs as a bind mount of the base fs
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root := container.RootfsPath()
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if err := os.MkdirAll(root, 0755); err != nil && !os.IsExist(err) {
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return nil
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}
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// Create a bind mount of the base fs as a place where we can add mounts
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// without affecting the ability to access the base fs
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if err := mount.Mount(container.basefs, root, "none", "bind,rw"); err != nil {
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if err := mountVolumesForContainer(container, envPath); err != nil {
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return err
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}
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// Make sure the root fs is private so the mounts here don't propagate to basefs
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if err := mount.ForceMount(root, root, "none", "private"); err != nil {
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return err
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}
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// Mount docker specific files into the containers root fs
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if err := mount.Mount(runtime.sysInitPath, path.Join(root, "/.dockerinit"), "none", "bind,ro"); err != nil {
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return err
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}
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if err := mount.Mount(envPath, path.Join(root, "/.dockerenv"), "none", "bind,ro"); err != nil {
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return err
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}
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if err := mount.Mount(container.ResolvConfPath, path.Join(root, "/etc/resolv.conf"), "none", "bind,ro"); err != nil {
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return err
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}
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if container.HostnamePath != "" && container.HostsPath != "" {
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if err := mount.Mount(container.HostnamePath, path.Join(root, "/etc/hostname"), "none", "bind,ro"); err != nil {
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return err
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}
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if err := mount.Mount(container.HostsPath, path.Join(root, "/etc/hosts"), "none", "bind,ro"); err != nil {
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return err
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}
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}
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// Mount user specified volumes
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for r, v := range container.Volumes {
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mountAs := "ro"
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if container.VolumesRW[r] {
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mountAs = "rw"
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}
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r = path.Join(root, r)
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if p, err := utils.FollowSymlinkInScope(r, root); err != nil {
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return err
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} else {
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r = p
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}
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if err := mount.Mount(v, r, "none", fmt.Sprintf("bind,%s", mountAs)); err != nil {
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return err
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}
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}
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populateCommand(container)
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// Setup logging of stdout and stderr to disk
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@ -695,205 +622,6 @@ func (container *Container) Start() (err error) {
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return nil
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}
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func (container *Container) getBindMap() (map[string]BindMap, error) {
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// Create the requested bind mounts
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binds := make(map[string]BindMap)
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// Define illegal container destinations
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illegalDsts := []string{"/", "."}
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for _, bind := range container.hostConfig.Binds {
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// FIXME: factorize bind parsing in parseBind
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var src, dst, mode string
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arr := strings.Split(bind, ":")
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if len(arr) == 2 {
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src = arr[0]
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dst = arr[1]
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mode = "rw"
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} else if len(arr) == 3 {
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src = arr[0]
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dst = arr[1]
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mode = arr[2]
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} else {
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return nil, fmt.Errorf("Invalid bind specification: %s", bind)
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}
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// Bail if trying to mount to an illegal destination
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for _, illegal := range illegalDsts {
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if dst == illegal {
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return nil, fmt.Errorf("Illegal bind destination: %s", dst)
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}
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}
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bindMap := BindMap{
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SrcPath: src,
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DstPath: dst,
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Mode: mode,
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}
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binds[path.Clean(dst)] = bindMap
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}
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return binds, nil
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}
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func (container *Container) createVolumes() error {
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binds, err := container.getBindMap()
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if err != nil {
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return err
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}
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volumesDriver := container.runtime.volumes.driver
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// Create the requested volumes if they don't exist
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for volPath := range container.Config.Volumes {
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volPath = path.Clean(volPath)
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volIsDir := true
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// Skip existing volumes
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if _, exists := container.Volumes[volPath]; exists {
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continue
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}
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var srcPath string
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var isBindMount bool
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srcRW := false
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// If an external bind is defined for this volume, use that as a source
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if bindMap, exists := binds[volPath]; exists {
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isBindMount = true
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srcPath = bindMap.SrcPath
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if strings.ToLower(bindMap.Mode) == "rw" {
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srcRW = true
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}
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if stat, err := os.Stat(bindMap.SrcPath); err != nil {
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return err
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} else {
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volIsDir = stat.IsDir()
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}
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// Otherwise create an directory in $ROOT/volumes/ and use that
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} else {
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// Do not pass a container as the parameter for the volume creation.
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// The graph driver using the container's information ( Image ) to
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// create the parent.
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c, err := container.runtime.volumes.Create(nil, nil, "", "", nil)
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if err != nil {
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return err
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}
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srcPath, err = volumesDriver.Get(c.ID)
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if err != nil {
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return fmt.Errorf("Driver %s failed to get volume rootfs %s: %s", volumesDriver, c.ID, err)
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}
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srcRW = true // RW by default
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}
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if p, err := filepath.EvalSymlinks(srcPath); err != nil {
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return err
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} else {
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srcPath = p
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}
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container.Volumes[volPath] = srcPath
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container.VolumesRW[volPath] = srcRW
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// Create the mountpoint
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volPath = path.Join(container.basefs, volPath)
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rootVolPath, err := utils.FollowSymlinkInScope(volPath, container.basefs)
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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(rootVolPath); err != nil {
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if os.IsNotExist(err) {
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if volIsDir {
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if err := os.MkdirAll(rootVolPath, 0755); err != nil {
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return err
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}
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} else {
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if err := os.MkdirAll(path.Dir(rootVolPath), 0755); err != nil {
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return err
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}
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if f, err := os.OpenFile(rootVolPath, os.O_CREATE, 0755); err != nil {
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return err
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} else {
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f.Close()
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}
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}
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}
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}
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// Do not copy or change permissions if we are mounting from the host
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if srcRW && !isBindMount {
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volList, err := ioutil.ReadDir(rootVolPath)
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if err != nil {
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return err
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}
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if len(volList) > 0 {
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srcList, err := ioutil.ReadDir(srcPath)
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if err != nil {
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return err
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}
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if len(srcList) == 0 {
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// If the source volume is empty copy files from the root into the volume
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if err := archive.CopyWithTar(rootVolPath, srcPath); err != nil {
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return err
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}
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var stat syscall.Stat_t
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if err := syscall.Stat(rootVolPath, &stat); err != nil {
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return err
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}
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var srcStat syscall.Stat_t
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if err := syscall.Stat(srcPath, &srcStat); err != nil {
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return err
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}
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// Change the source volume's ownership if it differs from the root
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// files that were just copied
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if stat.Uid != srcStat.Uid || stat.Gid != srcStat.Gid {
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if err := os.Chown(srcPath, int(stat.Uid), int(stat.Gid)); err != nil {
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return err
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}
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}
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}
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}
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}
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}
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return nil
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}
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func (container *Container) applyExternalVolumes() error {
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if container.Config.VolumesFrom != "" {
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containerSpecs := strings.Split(container.Config.VolumesFrom, ",")
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for _, containerSpec := range containerSpecs {
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mountRW := true
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specParts := strings.SplitN(containerSpec, ":", 2)
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switch len(specParts) {
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case 0:
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return fmt.Errorf("Malformed volumes-from specification: %s", container.Config.VolumesFrom)
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case 2:
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switch specParts[1] {
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case "ro":
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mountRW = false
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case "rw": // mountRW is already true
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default:
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return fmt.Errorf("Malformed volumes-from specification: %s", containerSpec)
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}
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}
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c := container.runtime.Get(specParts[0])
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if c == nil {
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return fmt.Errorf("Container %s not found. Impossible to mount its volumes", container.ID)
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}
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for volPath, id := range c.Volumes {
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if _, exists := container.Volumes[volPath]; exists {
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continue
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}
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if err := os.MkdirAll(path.Join(container.basefs, volPath), 0755); err != nil {
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return err
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}
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container.Volumes[volPath] = id
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if isRW, exists := c.VolumesRW[volPath]; exists {
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container.VolumesRW[volPath] = isRW && mountRW
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}
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}
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}
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}
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return nil
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}
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func (container *Container) Run() error {
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if err := container.Start(); err != nil {
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return err
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@ -1166,29 +894,7 @@ func (container *Container) cleanup() {
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}
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}
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var (
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root = container.RootfsPath()
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mounts = []string{
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root,
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path.Join(root, "/.dockerinit"),
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path.Join(root, "/.dockerenv"),
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path.Join(root, "/etc/resolv.conf"),
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}
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)
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if container.HostnamePath != "" && container.HostsPath != "" {
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mounts = append(mounts, path.Join(root, "/etc/hostname"), path.Join(root, "/etc/hosts"))
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}
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for r := range container.Volumes {
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mounts = append(mounts, path.Join(root, r))
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}
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for i := len(mounts) - 1; i >= 0; i-- {
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if lastError := mount.Unmount(mounts[i]); lastError != nil {
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log.Printf("Failed to umount %v: %v", mounts[i], lastError)
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}
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}
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unmountVolumesForContainer(container)
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if err := container.Unmount(); err != nil {
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log.Printf("%v: Failed to umount filesystem: %v", container.ID, err)
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@ -0,0 +1,332 @@
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package docker
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import (
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"fmt"
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"github.com/dotcloud/docker/archive"
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"github.com/dotcloud/docker/pkg/mount"
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"github.com/dotcloud/docker/utils"
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"io/ioutil"
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"log"
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"os"
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"path/filepath"
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"strings"
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"syscall"
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)
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type BindMap struct {
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SrcPath string
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DstPath string
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Mode string
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}
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|
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func prepareVolumesForContainer(container *Container) error {
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if container.Volumes == nil || len(container.Volumes) == 0 {
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container.Volumes = make(map[string]string)
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container.VolumesRW = make(map[string]bool)
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}
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if err := applyVolumesFrom(container); err != nil {
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return err
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}
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if err := createVolumes(container); 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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func mountVolumesForContainer(container *Container, envPath string) error {
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// Setup the root fs as a bind mount of the base fs
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var (
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root = container.RootfsPath()
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runtime = container.runtime
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)
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if err := os.MkdirAll(root, 0755); err != nil && !os.IsExist(err) {
|
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return nil
|
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}
|
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|
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// Create a bind mount of the base fs as a place where we can add mounts
|
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// without affecting the ability to access the base fs
|
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if err := mount.Mount(container.basefs, root, "none", "bind,rw"); err != nil {
|
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return err
|
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}
|
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|
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// Make sure the root fs is private so the mounts here don't propagate to basefs
|
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if err := mount.ForceMount(root, root, "none", "private"); err != nil {
|
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return err
|
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}
|
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|
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// Mount docker specific files into the containers root fs
|
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if err := mount.Mount(runtime.sysInitPath, filepath.Join(root, "/.dockerinit"), "none", "bind,ro"); err != nil {
|
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return err
|
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}
|
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if err := mount.Mount(envPath, filepath.Join(root, "/.dockerenv"), "none", "bind,ro"); err != nil {
|
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return err
|
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}
|
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if err := mount.Mount(container.ResolvConfPath, filepath.Join(root, "/etc/resolv.conf"), "none", "bind,ro"); err != nil {
|
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return err
|
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}
|
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|
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if container.HostnamePath != "" && container.HostsPath != "" {
|
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if err := mount.Mount(container.HostnamePath, filepath.Join(root, "/etc/hostname"), "none", "bind,ro"); err != nil {
|
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return err
|
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}
|
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if err := mount.Mount(container.HostsPath, filepath.Join(root, "/etc/hosts"), "none", "bind,ro"); err != nil {
|
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return err
|
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}
|
||||
}
|
||||
|
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// Mount user specified volumes
|
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for r, v := range container.Volumes {
|
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mountAs := "ro"
|
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if container.VolumesRW[r] {
|
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mountAs = "rw"
|
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}
|
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|
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r = filepath.Join(root, r)
|
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if p, err := utils.FollowSymlinkInScope(r, root); err != nil {
|
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return err
|
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} else {
|
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r = p
|
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}
|
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|
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if err := mount.Mount(v, r, "none", fmt.Sprintf("bind,%s", mountAs)); err != nil {
|
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return err
|
||||
}
|
||||
}
|
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return nil
|
||||
}
|
||||
|
||||
func unmountVolumesForContainer(container *Container) {
|
||||
var (
|
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root = container.RootfsPath()
|
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mounts = []string{
|
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root,
|
||||
filepath.Join(root, "/.dockerinit"),
|
||||
filepath.Join(root, "/.dockerenv"),
|
||||
filepath.Join(root, "/etc/resolv.conf"),
|
||||
}
|
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)
|
||||
|
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if container.HostnamePath != "" && container.HostsPath != "" {
|
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mounts = append(mounts, filepath.Join(root, "/etc/hostname"), filepath.Join(root, "/etc/hosts"))
|
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}
|
||||
|
||||
for r := range container.Volumes {
|
||||
mounts = append(mounts, filepath.Join(root, r))
|
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}
|
||||
|
||||
for i := len(mounts) - 1; i >= 0; i-- {
|
||||
if lastError := mount.Unmount(mounts[i]); lastError != nil {
|
||||
log.Printf("Failed to umount %v: %v", mounts[i], lastError)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func applyVolumesFrom(container *Container) error {
|
||||
if container.Config.VolumesFrom != "" {
|
||||
for _, containerSpec := range strings.Split(container.Config.VolumesFrom, ",") {
|
||||
var (
|
||||
mountRW = true
|
||||
specParts = strings.SplitN(containerSpec, ":", 2)
|
||||
)
|
||||
|
||||
switch len(specParts) {
|
||||
case 0:
|
||||
return fmt.Errorf("Malformed volumes-from specification: %s", container.Config.VolumesFrom)
|
||||
case 2:
|
||||
switch specParts[1] {
|
||||
case "ro":
|
||||
mountRW = false
|
||||
case "rw": // mountRW is already true
|
||||
default:
|
||||
return fmt.Errorf("Malformed volumes-from specification: %s", containerSpec)
|
||||
}
|
||||
}
|
||||
|
||||
c := container.runtime.Get(specParts[0])
|
||||
if c == nil {
|
||||
return fmt.Errorf("Container %s not found. Impossible to mount its volumes", container.ID)
|
||||
}
|
||||
|
||||
for volPath, id := range c.Volumes {
|
||||
if _, exists := container.Volumes[volPath]; exists {
|
||||
continue
|
||||
}
|
||||
if err := os.MkdirAll(filepath.Join(container.basefs, volPath), 0755); err != nil {
|
||||
return err
|
||||
}
|
||||
container.Volumes[volPath] = id
|
||||
if isRW, exists := c.VolumesRW[volPath]; exists {
|
||||
container.VolumesRW[volPath] = isRW && mountRW
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func getBindMap(container *Container) (map[string]BindMap, error) {
|
||||
var (
|
||||
// Create the requested bind mounts
|
||||
binds = make(map[string]BindMap)
|
||||
// Define illegal container destinations
|
||||
illegalDsts = []string{"/", "."}
|
||||
)
|
||||
|
||||
for _, bind := range container.hostConfig.Binds {
|
||||
// FIXME: factorize bind parsing in parseBind
|
||||
var (
|
||||
src, dst, mode string
|
||||
arr = strings.Split(bind, ":")
|
||||
)
|
||||
|
||||
if len(arr) == 2 {
|
||||
src = arr[0]
|
||||
dst = arr[1]
|
||||
mode = "rw"
|
||||
} else if len(arr) == 3 {
|
||||
src = arr[0]
|
||||
dst = arr[1]
|
||||
mode = arr[2]
|
||||
} else {
|
||||
return nil, fmt.Errorf("Invalid bind specification: %s", bind)
|
||||
}
|
||||
|
||||
// Bail if trying to mount to an illegal destination
|
||||
for _, illegal := range illegalDsts {
|
||||
if dst == illegal {
|
||||
return nil, fmt.Errorf("Illegal bind destination: %s", dst)
|
||||
}
|
||||
}
|
||||
|
||||
bindMap := BindMap{
|
||||
SrcPath: src,
|
||||
DstPath: dst,
|
||||
Mode: mode,
|
||||
}
|
||||
binds[filepath.Clean(dst)] = bindMap
|
||||
}
|
||||
return binds, nil
|
||||
}
|
||||
|
||||
func createVolumes(container *Container) error {
|
||||
binds, err := getBindMap(container)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
volumesDriver := container.runtime.volumes.driver
|
||||
// Create the requested volumes if they don't exist
|
||||
for volPath := range container.Config.Volumes {
|
||||
volPath = filepath.Clean(volPath)
|
||||
volIsDir := true
|
||||
// Skip existing volumes
|
||||
if _, exists := container.Volumes[volPath]; exists {
|
||||
continue
|
||||
}
|
||||
var srcPath string
|
||||
var isBindMount bool
|
||||
srcRW := false
|
||||
// If an external bind is defined for this volume, use that as a source
|
||||
if bindMap, exists := binds[volPath]; exists {
|
||||
isBindMount = true
|
||||
srcPath = bindMap.SrcPath
|
||||
if strings.ToLower(bindMap.Mode) == "rw" {
|
||||
srcRW = true
|
||||
}
|
||||
if stat, err := os.Stat(bindMap.SrcPath); err != nil {
|
||||
return err
|
||||
} else {
|
||||
volIsDir = stat.IsDir()
|
||||
}
|
||||
// Otherwise create an directory in $ROOT/volumes/ and use that
|
||||
} else {
|
||||
|
||||
// Do not pass a container as the parameter for the volume creation.
|
||||
// The graph driver using the container's information ( Image ) to
|
||||
// create the parent.
|
||||
c, err := container.runtime.volumes.Create(nil, nil, "", "", nil)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
srcPath, err = volumesDriver.Get(c.ID)
|
||||
if err != nil {
|
||||
return fmt.Errorf("Driver %s failed to get volume rootfs %s: %s", volumesDriver, c.ID, err)
|
||||
}
|
||||
srcRW = true // RW by default
|
||||
}
|
||||
|
||||
if p, err := filepath.EvalSymlinks(srcPath); err != nil {
|
||||
return err
|
||||
} else {
|
||||
srcPath = p
|
||||
}
|
||||
|
||||
container.Volumes[volPath] = srcPath
|
||||
container.VolumesRW[volPath] = srcRW
|
||||
|
||||
// Create the mountpoint
|
||||
volPath = filepath.Join(container.basefs, volPath)
|
||||
rootVolPath, err := utils.FollowSymlinkInScope(volPath, container.basefs)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
if _, err := os.Stat(rootVolPath); err != nil {
|
||||
if os.IsNotExist(err) {
|
||||
if volIsDir {
|
||||
if err := os.MkdirAll(rootVolPath, 0755); err != nil {
|
||||
return err
|
||||
}
|
||||
} else {
|
||||
if err := os.MkdirAll(filepath.Dir(rootVolPath), 0755); err != nil {
|
||||
return err
|
||||
}
|
||||
if f, err := os.OpenFile(rootVolPath, os.O_CREATE, 0755); err != nil {
|
||||
return err
|
||||
} else {
|
||||
f.Close()
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Do not copy or change permissions if we are mounting from the host
|
||||
if srcRW && !isBindMount {
|
||||
volList, err := ioutil.ReadDir(rootVolPath)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if len(volList) > 0 {
|
||||
srcList, err := ioutil.ReadDir(srcPath)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if len(srcList) == 0 {
|
||||
// If the source volume is empty copy files from the root into the volume
|
||||
if err := archive.CopyWithTar(rootVolPath, srcPath); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
var stat syscall.Stat_t
|
||||
if err := syscall.Stat(rootVolPath, &stat); err != nil {
|
||||
return err
|
||||
}
|
||||
var srcStat syscall.Stat_t
|
||||
if err := syscall.Stat(srcPath, &srcStat); err != nil {
|
||||
return err
|
||||
}
|
||||
// Change the source volume's ownership if it differs from the root
|
||||
// files that were just copied
|
||||
if stat.Uid != srcStat.Uid || stat.Gid != srcStat.Gid {
|
||||
if err := os.Chown(srcPath, int(stat.Uid), int(stat.Gid)); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
Loading…
Reference in New Issue