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snapshot.go
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snapshot.go
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package main
import (
"context"
"fmt"
"os"
"strings"
"text/tabwriter"
"github.com/containerd/containerd/progress"
"github.com/containerd/containerd/rootfs"
"github.com/containerd/containerd/snapshot"
digest "github.com/opencontainers/go-digest"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
)
var snapshotCommand = cli.Command{
Name: "snapshot",
Usage: "snapshot management",
Flags: snapshotterFlags,
Subcommands: cli.Commands{
archiveSnapshotCommand,
listSnapshotCommand,
usageSnapshotCommand,
removeSnapshotCommand,
prepareSnapshotCommand,
treeSnapshotCommand,
mountSnapshotCommand,
commitSnapshotCommand,
},
}
var archiveSnapshotCommand = cli.Command{
Name: "archive",
Usage: "Create an archive of a snapshot",
ArgsUsage: "[flags] id",
Flags: []cli.Flag{
cli.StringFlag{
Name: "id",
Usage: "id of the container or snapshot",
},
},
Action: func(clicontext *cli.Context) error {
ctx, cancel := appContext(clicontext)
defer cancel()
id := clicontext.String("id")
if id == "" {
return errors.New("container id must be provided")
}
snapshotter, err := getSnapshotter(clicontext)
if err != nil {
return err
}
differ, err := getDiffService(clicontext)
if err != nil {
return err
}
contentRef := fmt.Sprintf("diff-%s", id)
d, err := rootfs.Diff(ctx, id, contentRef, snapshotter, differ)
if err != nil {
return err
}
// TODO: Track progress
fmt.Printf("%s %s\n", d.MediaType, d.Digest)
return nil
},
}
var listSnapshotCommand = cli.Command{
Name: "list",
Aliases: []string{"ls"},
Usage: "List snapshots",
Action: func(clicontext *cli.Context) error {
ctx, cancel := appContext(clicontext)
defer cancel()
snapshotter, err := getSnapshotter(clicontext)
if err != nil {
return err
}
tw := tabwriter.NewWriter(os.Stdout, 1, 8, 1, ' ', 0)
fmt.Fprintln(tw, "ID\tPARENT\tKIND\t")
if err := snapshotter.Walk(ctx, func(ctx context.Context, info snapshot.Info) error {
fmt.Fprintf(tw, "%v\t%v\t%v\t\n",
info.Name,
info.Parent,
info.Kind)
return nil
}); err != nil {
return err
}
return tw.Flush()
},
}
var usageSnapshotCommand = cli.Command{
Name: "usage",
Usage: "Usage snapshots",
ArgsUsage: "[flags] [id] ...",
Flags: []cli.Flag{
cli.BoolFlag{
Name: "b",
Usage: "display size in bytes",
},
},
Action: func(clicontext *cli.Context) error {
ctx, cancel := appContext(clicontext)
defer cancel()
var displaySize func(int64) string
if clicontext.Bool("b") {
displaySize = func(s int64) string {
return fmt.Sprintf("%d", s)
}
} else {
displaySize = func(s int64) string {
return progress.Bytes(s).String()
}
}
snapshotter, err := getSnapshotter(clicontext)
if err != nil {
return err
}
tw := tabwriter.NewWriter(os.Stdout, 1, 8, 1, ' ', 0)
fmt.Fprintln(tw, "ID\tSize\tInodes\t")
if clicontext.NArg() == 0 {
if err := snapshotter.Walk(ctx, func(ctx context.Context, info snapshot.Info) error {
usage, err := snapshotter.Usage(ctx, info.Name)
if err != nil {
return err
}
fmt.Fprintf(tw, "%v\t%s\t%d\t\n", info.Name, displaySize(usage.Size), usage.Inodes)
return nil
}); err != nil {
return err
}
} else {
for _, id := range clicontext.Args() {
usage, err := snapshotter.Usage(ctx, id)
if err != nil {
return err
}
fmt.Fprintf(tw, "%v\t%s\t%d\t\n", id, displaySize(usage.Size), usage.Inodes)
}
}
return tw.Flush()
},
}
var removeSnapshotCommand = cli.Command{
Name: "remove",
Aliases: []string{"rm"},
ArgsUsage: "id [id] ...",
Usage: "remove snapshots",
Action: func(clicontext *cli.Context) error {
ctx, cancel := appContext(clicontext)
defer cancel()
snapshotter, err := getSnapshotter(clicontext)
if err != nil {
return err
}
for _, id := range clicontext.Args() {
err = snapshotter.Remove(ctx, id)
if err != nil {
return errors.Wrapf(err, "failed to remove %q", id)
}
}
return nil
},
}
var prepareSnapshotCommand = cli.Command{
Name: "prepare",
Usage: "prepare a snapshot from a committed snapshot",
ArgsUsage: "[flags] digest target",
Flags: []cli.Flag{
cli.StringFlag{
Name: "snapshot-name",
Usage: "name of the target snapshot",
},
},
Action: func(clicontext *cli.Context) error {
ctx, cancel := appContext(clicontext)
defer cancel()
if clicontext.NArg() != 2 {
return cli.ShowSubcommandHelp(clicontext)
}
dgst, err := digest.Parse(clicontext.Args().Get(0))
if err != nil {
return err
}
target := clicontext.Args().Get(1)
snapshotName := clicontext.String("snapshot-name")
// Use the target as the snapshotName if no snapshot-name is provided
if snapshotName == "" {
snapshotName = target
}
logrus.Infof("preparing mounts %s", dgst.String())
snapshotter, err := getSnapshotter(clicontext)
if err != nil {
return err
}
mounts, err := snapshotter.Prepare(ctx, snapshotName, dgst.String())
if err != nil {
return err
}
for _, m := range mounts {
fmt.Fprintf(os.Stdout, "mount -t %s %s %s -o %s\n", m.Type, m.Source, target, strings.Join(m.Options, ","))
}
return nil
},
}
var mountSnapshotCommand = cli.Command{
Name: "mount",
Usage: "mount gets mount commands for the active snapshots",
ArgsUsage: "[flags] target",
Flags: []cli.Flag{
cli.StringFlag{
Name: "snapshot-name",
Usage: "name of the snapshot",
},
},
Action: func(clicontext *cli.Context) error {
ctx, cancel := appContext(clicontext)
defer cancel()
if clicontext.NArg() != 1 {
return cli.ShowSubcommandHelp(clicontext)
}
target := clicontext.Args().Get(0)
snapshotName := clicontext.String("snapshot-name")
// Use the target as the snapshotName if no snapshot-name is provided
if snapshotName == "" {
snapshotName = target
}
snapshotter, err := getSnapshotter(clicontext)
if err != nil {
return err
}
mounts, err := snapshotter.Mounts(ctx, snapshotName)
if err != nil {
return err
}
for _, m := range mounts {
fmt.Fprintf(os.Stdout, "mount -t %s %s %s -o %s\n", m.Type, m.Source, target, strings.Join(m.Options, ","))
}
return nil
},
}
var commitSnapshotCommand = cli.Command{
Name: "commit",
Usage: "commit creates a new snapshot with diff from parent snapshot",
ArgsUsage: "[flags] <id> <target>",
Action: func(clicontext *cli.Context) error {
ctx, cancel := appContext(clicontext)
defer cancel()
if clicontext.NArg() != 2 {
return cli.ShowSubcommandHelp(clicontext)
}
id := clicontext.Args().Get(0)
target := clicontext.Args().Get(1)
snapshotter, err := getSnapshotter(clicontext)
if err != nil {
return err
}
return snapshotter.Commit(ctx, target, id)
},
}
var treeSnapshotCommand = cli.Command{
Name: "tree",
Usage: "Display tree view of snapshot branches",
Action: func(clicontext *cli.Context) error {
ctx, cancel := appContext(clicontext)
defer cancel()
snapshotter, err := getSnapshotter(clicontext)
if err != nil {
return err
}
tree := make(map[string]*snapshotTreeNode)
if err := snapshotter.Walk(ctx, func(ctx context.Context, info snapshot.Info) error {
// Get or create node and add node details
node := getOrCreateTreeNode(info.Name, tree)
if info.Parent != "" {
node.Parent = info.Parent
p := getOrCreateTreeNode(info.Parent, tree)
p.Children = append(p.Children, info.Name)
}
return nil
}); err != nil {
return err
}
printTree(tree)
return nil
},
}
type snapshotTreeNode struct {
Name string
Parent string
Children []string
}
func getOrCreateTreeNode(name string, tree map[string]*snapshotTreeNode) *snapshotTreeNode {
if node, ok := tree[name]; ok {
return node
}
node := &snapshotTreeNode{
Name: name,
}
tree[name] = node
return node
}
func printTree(tree map[string]*snapshotTreeNode) {
for _, node := range tree {
// Print for root(parent-less) nodes only
if node.Parent == "" {
printNode(node.Name, tree, 0)
}
}
}
func printNode(name string, tree map[string]*snapshotTreeNode, level int) {
node := tree[name]
fmt.Printf("%s\\_ %s\n", strings.Repeat(" ", level), node.Name)
level++
for _, child := range node.Children {
printNode(child, tree, level)
}
}