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restic/cmd/restic/cmd_ls.go
Alexander Neumann 0c48e515f0
Merge pull request #2630 from MichaelEischer/fix-staticcheck
Fix lots of small issues reported by staticcheck
2020-09-13 16:19:22 +02:00

237 lines
6.3 KiB
Go

package main
import (
"context"
"encoding/json"
"os"
"strings"
"time"
"github.com/spf13/cobra"
"github.com/restic/restic/internal/errors"
"github.com/restic/restic/internal/fs"
"github.com/restic/restic/internal/restic"
"github.com/restic/restic/internal/walker"
)
var cmdLs = &cobra.Command{
Use: "ls [flags] snapshotID [dir...]",
Short: "List files in a snapshot",
Long: `
The "ls" command lists files and directories in a snapshot.
The special snapshot ID "latest" can be used to list files and
directories of the latest snapshot in the repository. The
--host flag can be used in conjunction to select the latest
snapshot originating from a certain host only.
File listings can optionally be filtered by directories. Any
positional arguments after the snapshot ID are interpreted as
absolute directory paths, and only files inside those directories
will be listed. If the --recursive flag is used, then the filter
will allow traversing into matching directories' subfolders.
Any directory paths specified must be absolute (starting with
a path separator); paths use the forward slash '/' as separator.
EXIT STATUS
===========
Exit status is 0 if the command was successful, and non-zero if there was any error.
`,
DisableAutoGenTag: true,
RunE: func(cmd *cobra.Command, args []string) error {
return runLs(lsOptions, globalOptions, args)
},
}
// LsOptions collects all options for the ls command.
type LsOptions struct {
ListLong bool
Hosts []string
Tags restic.TagLists
Paths []string
Recursive bool
}
var lsOptions LsOptions
func init() {
cmdRoot.AddCommand(cmdLs)
flags := cmdLs.Flags()
flags.BoolVarP(&lsOptions.ListLong, "long", "l", false, "use a long listing format showing size and mode")
flags.StringArrayVarP(&lsOptions.Hosts, "host", "H", nil, "only consider snapshots for this `host`, when no snapshot ID is given (can be specified multiple times)")
flags.Var(&lsOptions.Tags, "tag", "only consider snapshots which include this `taglist`, when no snapshot ID is given")
flags.StringArrayVar(&lsOptions.Paths, "path", nil, "only consider snapshots which include this (absolute) `path`, when no snapshot ID is given")
flags.BoolVar(&lsOptions.Recursive, "recursive", false, "include files in subfolders of the listed directories")
}
type lsSnapshot struct {
*restic.Snapshot
ID *restic.ID `json:"id"`
ShortID string `json:"short_id"`
StructType string `json:"struct_type"` // "snapshot"
}
type lsNode struct {
Name string `json:"name"`
Type string `json:"type"`
Path string `json:"path"`
UID uint32 `json:"uid"`
GID uint32 `json:"gid"`
Size uint64 `json:"size,omitempty"`
Mode os.FileMode `json:"mode,omitempty"`
ModTime time.Time `json:"mtime,omitempty"`
AccessTime time.Time `json:"atime,omitempty"`
ChangeTime time.Time `json:"ctime,omitempty"`
StructType string `json:"struct_type"` // "node"
}
func runLs(opts LsOptions, gopts GlobalOptions, args []string) error {
if len(args) == 0 {
return errors.Fatal("no snapshot ID specified")
}
// extract any specific directories to walk
var dirs []string
if len(args) > 1 {
dirs = args[1:]
for _, dir := range dirs {
if !strings.HasPrefix(dir, "/") {
return errors.Fatal("All path filters must be absolute, starting with a forward slash '/'")
}
}
}
withinDir := func(nodepath string) bool {
if len(dirs) == 0 {
return true
}
for _, dir := range dirs {
// we're within one of the selected dirs, example:
// nodepath: "/test/foo"
// dir: "/test"
if fs.HasPathPrefix(dir, nodepath) {
return true
}
}
return false
}
approachingMatchingTree := func(nodepath string) bool {
if len(dirs) == 0 {
return true
}
for _, dir := range dirs {
// the current node path is a prefix for one of the
// directories, so we're interested in something deeper in the
// tree. Example:
// nodepath: "/test"
// dir: "/test/foo"
if fs.HasPathPrefix(nodepath, dir) {
return true
}
}
return false
}
repo, err := OpenRepository(gopts)
if err != nil {
return err
}
if err = repo.LoadIndex(gopts.ctx); err != nil {
return err
}
ctx, cancel := context.WithCancel(gopts.ctx)
defer cancel()
var (
printSnapshot func(sn *restic.Snapshot)
printNode func(path string, node *restic.Node)
)
if gopts.JSON {
enc := json.NewEncoder(gopts.stdout)
printSnapshot = func(sn *restic.Snapshot) {
enc.Encode(lsSnapshot{
Snapshot: sn,
ID: sn.ID(),
ShortID: sn.ID().Str(),
StructType: "snapshot",
})
}
printNode = func(path string, node *restic.Node) {
enc.Encode(lsNode{
Name: node.Name,
Type: node.Type,
Path: path,
UID: node.UID,
GID: node.GID,
Size: node.Size,
Mode: node.Mode,
ModTime: node.ModTime,
AccessTime: node.AccessTime,
ChangeTime: node.ChangeTime,
StructType: "node",
})
}
} else {
printSnapshot = func(sn *restic.Snapshot) {
Verbosef("snapshot %s of %v filtered by %v at %s):\n", sn.ID().Str(), sn.Paths, dirs, sn.Time)
}
printNode = func(path string, node *restic.Node) {
Printf("%s\n", formatNode(path, node, lsOptions.ListLong))
}
}
for sn := range FindFilteredSnapshots(ctx, repo, opts.Hosts, opts.Tags, opts.Paths, args[:1]) {
printSnapshot(sn)
err := walker.Walk(ctx, repo, *sn.Tree, nil, func(_ restic.ID, nodepath string, node *restic.Node, err error) (bool, error) {
if err != nil {
return false, err
}
if node == nil {
return false, nil
}
if withinDir(nodepath) {
// if we're within a dir, print the node
printNode(nodepath, node)
// if recursive listing is requested, signal the walker that it
// should continue walking recursively
if opts.Recursive {
return false, nil
}
}
// if there's an upcoming match deeper in the tree (but we're not
// there yet), signal the walker to descend into any subdirs
if approachingMatchingTree(nodepath) {
return false, nil
}
// otherwise, signal the walker to not walk recursively into any
// subdirs
if node.Type == "dir" {
return false, walker.ErrSkipNode
}
return false, nil
})
if err != nil {
return err
}
}
return nil
}