mirror of
https://github.com/rclone/rclone.git
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351 lines
9.0 KiB
Go
351 lines
9.0 KiB
Go
package info
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// FIXME once translations are implemented will need a no-escape
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// option for Put so we can make these tests work agaig
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import (
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"bytes"
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"context"
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"fmt"
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"io"
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"sort"
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"strings"
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"sync"
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"time"
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"github.com/pkg/errors"
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"github.com/rclone/rclone/cmd"
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"github.com/rclone/rclone/fs"
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"github.com/rclone/rclone/fs/hash"
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"github.com/rclone/rclone/fs/object"
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"github.com/rclone/rclone/lib/random"
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"github.com/spf13/cobra"
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)
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type position int
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const (
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positionMiddle position = 1 << iota
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positionLeft
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positionRight
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positionNone position = 0
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positionAll position = positionRight<<1 - 1
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)
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var (
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checkNormalization bool
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checkControl bool
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checkLength bool
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checkStreaming bool
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positionList = []position{positionMiddle, positionLeft, positionRight}
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)
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func init() {
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cmd.Root.AddCommand(commandDefintion)
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commandDefintion.Flags().BoolVarP(&checkNormalization, "check-normalization", "", true, "Check UTF-8 Normalization.")
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commandDefintion.Flags().BoolVarP(&checkControl, "check-control", "", true, "Check control characters.")
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commandDefintion.Flags().BoolVarP(&checkLength, "check-length", "", true, "Check max filename length.")
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commandDefintion.Flags().BoolVarP(&checkStreaming, "check-streaming", "", true, "Check uploads with indeterminate file size.")
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}
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var commandDefintion = &cobra.Command{
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Use: "info [remote:path]+",
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Short: `Discovers file name or other limitations for paths.`,
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Long: `rclone info discovers what filenames and upload methods are possible
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to write to the paths passed in and how long they can be. It can take some
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time. It will write test files into the remote:path passed in. It outputs
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a bit of go code for each one.
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`,
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Hidden: true,
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Run: func(command *cobra.Command, args []string) {
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cmd.CheckArgs(1, 1e6, command, args)
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for i := range args {
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f := cmd.NewFsDir(args[i : i+1])
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cmd.Run(false, false, command, func() error {
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return readInfo(context.Background(), f)
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})
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}
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},
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}
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type results struct {
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ctx context.Context
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f fs.Fs
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mu sync.Mutex
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stringNeedsEscaping map[string]position
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maxFileLength int
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canWriteUnnormalized bool
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canReadUnnormalized bool
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canReadRenormalized bool
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canStream bool
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}
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func newResults(ctx context.Context, f fs.Fs) *results {
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return &results{
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ctx: ctx,
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f: f,
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stringNeedsEscaping: make(map[string]position),
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}
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}
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// Print the results to stdout
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func (r *results) Print() {
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fmt.Printf("// %s\n", r.f.Name())
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if checkControl {
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escape := []string{}
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for c, needsEscape := range r.stringNeedsEscaping {
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if needsEscape != positionNone {
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escape = append(escape, fmt.Sprintf("0x%02X", c))
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}
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}
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sort.Strings(escape)
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fmt.Printf("stringNeedsEscaping = []byte{\n")
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fmt.Printf("\t%s\n", strings.Join(escape, ", "))
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fmt.Printf("}\n")
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}
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if checkLength {
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fmt.Printf("maxFileLength = %d\n", r.maxFileLength)
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}
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if checkNormalization {
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fmt.Printf("canWriteUnnormalized = %v\n", r.canWriteUnnormalized)
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fmt.Printf("canReadUnnormalized = %v\n", r.canReadUnnormalized)
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fmt.Printf("canReadRenormalized = %v\n", r.canReadRenormalized)
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}
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if checkStreaming {
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fmt.Printf("canStream = %v\n", r.canStream)
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}
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}
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// writeFile writes a file with some random contents
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func (r *results) writeFile(path string) (fs.Object, error) {
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contents := random.String(50)
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src := object.NewStaticObjectInfo(path, time.Now(), int64(len(contents)), true, nil, r.f)
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return r.f.Put(r.ctx, bytes.NewBufferString(contents), src)
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}
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// check whether normalization is enforced and check whether it is
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// done on the files anyway
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func (r *results) checkUTF8Normalization() {
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unnormalized := "Héroique"
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normalized := "Héroique"
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_, err := r.writeFile(unnormalized)
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if err != nil {
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r.canWriteUnnormalized = false
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return
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}
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r.canWriteUnnormalized = true
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_, err = r.f.NewObject(r.ctx, unnormalized)
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if err == nil {
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r.canReadUnnormalized = true
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}
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_, err = r.f.NewObject(r.ctx, normalized)
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if err == nil {
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r.canReadRenormalized = true
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}
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}
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func (r *results) checkStringPositions(s string) {
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fs.Infof(r.f, "Writing position file 0x%0X", s)
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positionError := positionNone
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for _, pos := range positionList {
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path := ""
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switch pos {
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case positionMiddle:
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path = fmt.Sprintf("position-middle-%0X-%s-", s, s)
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case positionLeft:
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path = fmt.Sprintf("%s-position-left-%0X", s, s)
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case positionRight:
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path = fmt.Sprintf("position-right-%0X-%s", s, s)
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default:
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panic("invalid position: " + pos.String())
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}
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_, writeErr := r.writeFile(path)
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if writeErr != nil {
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fs.Infof(r.f, "Writing %s position file 0x%0X Error: %s", pos.String(), s, writeErr)
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} else {
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fs.Infof(r.f, "Writing %s position file 0x%0X OK", pos.String(), s)
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}
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obj, getErr := r.f.NewObject(r.ctx, path)
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if getErr != nil {
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fs.Infof(r.f, "Getting %s position file 0x%0X Error: %s", pos.String(), s, getErr)
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} else {
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if obj.Size() != 50 {
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fs.Infof(r.f, "Getting %s position file 0x%0X Invalid Size: %d", pos.String(), s, obj.Size())
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} else {
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fs.Infof(r.f, "Getting %s position file 0x%0X OK", pos.String(), s)
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}
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}
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if writeErr != nil || getErr != nil {
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positionError += pos
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}
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}
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r.mu.Lock()
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r.stringNeedsEscaping[s] = positionError
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r.mu.Unlock()
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}
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// check we can write a file with the control chars
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func (r *results) checkControls() {
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fs.Infof(r.f, "Trying to create control character file names")
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// Concurrency control
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tokens := make(chan struct{}, fs.Config.Checkers)
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for i := 0; i < fs.Config.Checkers; i++ {
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tokens <- struct{}{}
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}
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var wg sync.WaitGroup
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for i := rune(0); i < 128; i++ {
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s := string(i)
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if i == 0 || i == '/' {
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// We're not even going to check NULL or /
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r.stringNeedsEscaping[s] = positionAll
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continue
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}
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wg.Add(1)
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go func(s string) {
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defer wg.Done()
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token := <-tokens
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r.checkStringPositions(s)
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tokens <- token
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}(s)
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}
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for _, s := range []string{"＼", "\xBF", "\xFE"} {
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wg.Add(1)
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go func(s string) {
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defer wg.Done()
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token := <-tokens
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r.checkStringPositions(s)
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tokens <- token
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}(s)
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}
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wg.Wait()
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fs.Infof(r.f, "Done trying to create control character file names")
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}
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// find the max file name size we can use
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func (r *results) findMaxLength() {
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const maxLen = 16 * 1024
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name := make([]byte, maxLen)
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for i := range name {
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name[i] = 'a'
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}
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// Find the first size of filename we can't write
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i := sort.Search(len(name), func(i int) (fail bool) {
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defer func() {
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if err := recover(); err != nil {
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fs.Infof(r.f, "Couldn't write file with name length %d: %v", i, err)
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fail = true
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}
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}()
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path := string(name[:i])
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_, err := r.writeFile(path)
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if err != nil {
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fs.Infof(r.f, "Couldn't write file with name length %d: %v", i, err)
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return true
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}
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fs.Infof(r.f, "Wrote file with name length %d", i)
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return false
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})
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r.maxFileLength = i - 1
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fs.Infof(r.f, "Max file length is %d", r.maxFileLength)
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}
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func (r *results) checkStreaming() {
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putter := r.f.Put
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if r.f.Features().PutStream != nil {
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fs.Infof(r.f, "Given remote has specialized streaming function. Using that to test streaming.")
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putter = r.f.Features().PutStream
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}
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contents := "thinking of test strings is hard"
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buf := bytes.NewBufferString(contents)
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hashIn := hash.NewMultiHasher()
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in := io.TeeReader(buf, hashIn)
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objIn := object.NewStaticObjectInfo("checkStreamingTest", time.Now(), -1, true, nil, r.f)
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objR, err := putter(r.ctx, in, objIn)
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if err != nil {
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fs.Infof(r.f, "Streamed file failed to upload (%v)", err)
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r.canStream = false
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return
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}
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hashes := hashIn.Sums()
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types := objR.Fs().Hashes().Array()
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for _, Hash := range types {
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sum, err := objR.Hash(r.ctx, Hash)
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if err != nil {
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fs.Infof(r.f, "Streamed file failed when getting hash %v (%v)", Hash, err)
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r.canStream = false
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return
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}
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if !hash.Equals(hashes[Hash], sum) {
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fs.Infof(r.f, "Streamed file has incorrect hash %v: expecting %q got %q", Hash, hashes[Hash], sum)
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r.canStream = false
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return
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}
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}
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if int64(len(contents)) != objR.Size() {
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fs.Infof(r.f, "Streamed file has incorrect file size: expecting %d got %d", len(contents), objR.Size())
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r.canStream = false
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return
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}
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r.canStream = true
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}
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func readInfo(ctx context.Context, f fs.Fs) error {
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err := f.Mkdir(ctx, "")
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if err != nil {
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return errors.Wrap(err, "couldn't mkdir")
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}
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r := newResults(ctx, f)
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if checkControl {
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r.checkControls()
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}
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if checkLength {
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r.findMaxLength()
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}
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if checkNormalization {
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r.checkUTF8Normalization()
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}
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if checkStreaming {
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r.checkStreaming()
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}
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r.Print()
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return nil
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}
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func (e position) String() string {
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switch e {
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case positionNone:
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return "none"
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case positionAll:
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return "all"
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}
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var buf bytes.Buffer
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if e&positionMiddle != 0 {
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buf.WriteString("middle")
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e &= ^positionMiddle
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}
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if e&positionLeft != 0 {
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if buf.Len() != 0 {
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buf.WriteRune(',')
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}
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buf.WriteString("left")
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e &= ^positionLeft
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}
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if e&positionRight != 0 {
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if buf.Len() != 0 {
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buf.WriteRune(',')
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}
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buf.WriteString("right")
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e &= ^positionRight
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}
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if e != positionNone {
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panic("invalid position")
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}
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return buf.String()
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}
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