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8b74cad422Bumps [github.com/tdewolff/minify/v2](https://github.com/tdewolff/minify) from 2.21.2 to 2.21.3. - [Release notes](https://github.com/tdewolff/minify/releases) - [Commits](https://github.com/tdewolff/minify/compare/v2.21.2...v2.21.3) --- updated-dependencies: - dependency-name: github.com/tdewolff/minify/v2 dependency-type: direct:production update-type: version-update:semver-patch ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
682 lines
16 KiB
Go
682 lines
16 KiB
Go
//go:build windows
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// Windows backend based on ReadDirectoryChangesW()
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//
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// https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-readdirectorychangesw
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package fsnotify
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import (
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"errors"
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"fmt"
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"os"
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"path/filepath"
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"reflect"
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"runtime"
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"strings"
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"sync"
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"time"
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"unsafe"
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"github.com/fsnotify/fsnotify/internal"
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"golang.org/x/sys/windows"
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)
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type readDirChangesW struct {
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Events chan Event
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Errors chan error
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port windows.Handle // Handle to completion port
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input chan *input // Inputs to the reader are sent on this channel
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quit chan chan<- error
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mu sync.Mutex // Protects access to watches, closed
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watches watchMap // Map of watches (key: i-number)
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closed bool // Set to true when Close() is first called
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}
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func newBackend(ev chan Event, errs chan error) (backend, error) {
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return newBufferedBackend(50, ev, errs)
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}
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func newBufferedBackend(sz uint, ev chan Event, errs chan error) (backend, error) {
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port, err := windows.CreateIoCompletionPort(windows.InvalidHandle, 0, 0, 0)
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if err != nil {
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return nil, os.NewSyscallError("CreateIoCompletionPort", err)
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}
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w := &readDirChangesW{
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Events: ev,
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Errors: errs,
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port: port,
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watches: make(watchMap),
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input: make(chan *input, 1),
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quit: make(chan chan<- error, 1),
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}
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go w.readEvents()
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return w, nil
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}
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func (w *readDirChangesW) isClosed() bool {
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w.mu.Lock()
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defer w.mu.Unlock()
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return w.closed
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}
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func (w *readDirChangesW) sendEvent(name, renamedFrom string, mask uint64) bool {
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if mask == 0 {
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return false
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}
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event := w.newEvent(name, uint32(mask))
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event.renamedFrom = renamedFrom
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select {
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case ch := <-w.quit:
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w.quit <- ch
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case w.Events <- event:
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}
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return true
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}
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// Returns true if the error was sent, or false if watcher is closed.
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func (w *readDirChangesW) sendError(err error) bool {
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if err == nil {
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return true
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}
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select {
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case w.Errors <- err:
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return true
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case <-w.quit:
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return false
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}
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}
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func (w *readDirChangesW) Close() error {
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if w.isClosed() {
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return nil
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}
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w.mu.Lock()
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w.closed = true
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w.mu.Unlock()
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// Send "quit" message to the reader goroutine
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ch := make(chan error)
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w.quit <- ch
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if err := w.wakeupReader(); err != nil {
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return err
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}
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return <-ch
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}
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func (w *readDirChangesW) Add(name string) error { return w.AddWith(name) }
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func (w *readDirChangesW) AddWith(name string, opts ...addOpt) error {
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if w.isClosed() {
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return ErrClosed
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}
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if debug {
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fmt.Fprintf(os.Stderr, "FSNOTIFY_DEBUG: %s AddWith(%q)\n",
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time.Now().Format("15:04:05.000000000"), filepath.ToSlash(name))
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}
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with := getOptions(opts...)
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if !w.xSupports(with.op) {
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return fmt.Errorf("%w: %s", xErrUnsupported, with.op)
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}
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if with.bufsize < 4096 {
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return fmt.Errorf("fsnotify.WithBufferSize: buffer size cannot be smaller than 4096 bytes")
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}
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in := &input{
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op: opAddWatch,
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path: filepath.Clean(name),
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flags: sysFSALLEVENTS,
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reply: make(chan error),
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bufsize: with.bufsize,
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}
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w.input <- in
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if err := w.wakeupReader(); err != nil {
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return err
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}
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return <-in.reply
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}
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func (w *readDirChangesW) Remove(name string) error {
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if w.isClosed() {
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return nil
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}
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if debug {
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fmt.Fprintf(os.Stderr, "FSNOTIFY_DEBUG: %s Remove(%q)\n",
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time.Now().Format("15:04:05.000000000"), filepath.ToSlash(name))
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}
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in := &input{
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op: opRemoveWatch,
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path: filepath.Clean(name),
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reply: make(chan error),
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}
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w.input <- in
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if err := w.wakeupReader(); err != nil {
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return err
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}
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return <-in.reply
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}
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func (w *readDirChangesW) WatchList() []string {
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if w.isClosed() {
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return nil
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}
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w.mu.Lock()
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defer w.mu.Unlock()
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entries := make([]string, 0, len(w.watches))
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for _, entry := range w.watches {
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for _, watchEntry := range entry {
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for name := range watchEntry.names {
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entries = append(entries, filepath.Join(watchEntry.path, name))
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}
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// the directory itself is being watched
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if watchEntry.mask != 0 {
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entries = append(entries, watchEntry.path)
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}
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}
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}
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return entries
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}
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// These options are from the old golang.org/x/exp/winfsnotify, where you could
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// add various options to the watch. This has long since been removed.
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//
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// The "sys" in the name is misleading as they're not part of any "system".
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//
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// This should all be removed at some point, and just use windows.FILE_NOTIFY_*
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const (
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sysFSALLEVENTS = 0xfff
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sysFSCREATE = 0x100
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sysFSDELETE = 0x200
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sysFSDELETESELF = 0x400
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sysFSMODIFY = 0x2
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sysFSMOVE = 0xc0
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sysFSMOVEDFROM = 0x40
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sysFSMOVEDTO = 0x80
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sysFSMOVESELF = 0x800
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sysFSIGNORED = 0x8000
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)
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func (w *readDirChangesW) newEvent(name string, mask uint32) Event {
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e := Event{Name: name}
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if mask&sysFSCREATE == sysFSCREATE || mask&sysFSMOVEDTO == sysFSMOVEDTO {
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e.Op |= Create
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}
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if mask&sysFSDELETE == sysFSDELETE || mask&sysFSDELETESELF == sysFSDELETESELF {
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e.Op |= Remove
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}
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if mask&sysFSMODIFY == sysFSMODIFY {
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e.Op |= Write
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}
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if mask&sysFSMOVE == sysFSMOVE || mask&sysFSMOVESELF == sysFSMOVESELF || mask&sysFSMOVEDFROM == sysFSMOVEDFROM {
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e.Op |= Rename
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}
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return e
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}
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const (
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opAddWatch = iota
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opRemoveWatch
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)
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const (
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provisional uint64 = 1 << (32 + iota)
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)
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type input struct {
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op int
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path string
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flags uint32
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bufsize int
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reply chan error
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}
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type inode struct {
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handle windows.Handle
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volume uint32
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index uint64
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}
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type watch struct {
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ov windows.Overlapped
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ino *inode // i-number
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recurse bool // Recursive watch?
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path string // Directory path
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mask uint64 // Directory itself is being watched with these notify flags
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names map[string]uint64 // Map of names being watched and their notify flags
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rename string // Remembers the old name while renaming a file
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buf []byte // buffer, allocated later
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}
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type (
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indexMap map[uint64]*watch
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watchMap map[uint32]indexMap
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)
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func (w *readDirChangesW) wakeupReader() error {
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err := windows.PostQueuedCompletionStatus(w.port, 0, 0, nil)
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if err != nil {
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return os.NewSyscallError("PostQueuedCompletionStatus", err)
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}
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return nil
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}
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func (w *readDirChangesW) getDir(pathname string) (dir string, err error) {
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attr, err := windows.GetFileAttributes(windows.StringToUTF16Ptr(pathname))
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if err != nil {
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return "", os.NewSyscallError("GetFileAttributes", err)
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}
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if attr&windows.FILE_ATTRIBUTE_DIRECTORY != 0 {
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dir = pathname
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} else {
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dir, _ = filepath.Split(pathname)
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dir = filepath.Clean(dir)
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}
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return
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}
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func (w *readDirChangesW) getIno(path string) (ino *inode, err error) {
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h, err := windows.CreateFile(windows.StringToUTF16Ptr(path),
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windows.FILE_LIST_DIRECTORY,
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windows.FILE_SHARE_READ|windows.FILE_SHARE_WRITE|windows.FILE_SHARE_DELETE,
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nil, windows.OPEN_EXISTING,
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windows.FILE_FLAG_BACKUP_SEMANTICS|windows.FILE_FLAG_OVERLAPPED, 0)
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if err != nil {
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return nil, os.NewSyscallError("CreateFile", err)
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}
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var fi windows.ByHandleFileInformation
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err = windows.GetFileInformationByHandle(h, &fi)
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if err != nil {
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windows.CloseHandle(h)
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return nil, os.NewSyscallError("GetFileInformationByHandle", err)
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}
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ino = &inode{
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handle: h,
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volume: fi.VolumeSerialNumber,
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index: uint64(fi.FileIndexHigh)<<32 | uint64(fi.FileIndexLow),
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}
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return ino, nil
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}
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// Must run within the I/O thread.
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func (m watchMap) get(ino *inode) *watch {
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if i := m[ino.volume]; i != nil {
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return i[ino.index]
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}
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return nil
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}
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// Must run within the I/O thread.
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func (m watchMap) set(ino *inode, watch *watch) {
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i := m[ino.volume]
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if i == nil {
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i = make(indexMap)
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m[ino.volume] = i
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}
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i[ino.index] = watch
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}
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// Must run within the I/O thread.
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func (w *readDirChangesW) addWatch(pathname string, flags uint64, bufsize int) error {
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pathname, recurse := recursivePath(pathname)
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dir, err := w.getDir(pathname)
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if err != nil {
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return err
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}
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ino, err := w.getIno(dir)
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if err != nil {
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return err
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}
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w.mu.Lock()
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watchEntry := w.watches.get(ino)
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w.mu.Unlock()
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if watchEntry == nil {
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_, err := windows.CreateIoCompletionPort(ino.handle, w.port, 0, 0)
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if err != nil {
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windows.CloseHandle(ino.handle)
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return os.NewSyscallError("CreateIoCompletionPort", err)
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}
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watchEntry = &watch{
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ino: ino,
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path: dir,
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names: make(map[string]uint64),
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recurse: recurse,
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buf: make([]byte, bufsize),
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}
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w.mu.Lock()
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w.watches.set(ino, watchEntry)
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w.mu.Unlock()
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flags |= provisional
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} else {
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windows.CloseHandle(ino.handle)
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}
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if pathname == dir {
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watchEntry.mask |= flags
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} else {
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watchEntry.names[filepath.Base(pathname)] |= flags
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}
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err = w.startRead(watchEntry)
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if err != nil {
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return err
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}
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if pathname == dir {
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watchEntry.mask &= ^provisional
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} else {
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watchEntry.names[filepath.Base(pathname)] &= ^provisional
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}
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return nil
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}
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// Must run within the I/O thread.
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func (w *readDirChangesW) remWatch(pathname string) error {
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pathname, recurse := recursivePath(pathname)
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dir, err := w.getDir(pathname)
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if err != nil {
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return err
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}
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ino, err := w.getIno(dir)
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if err != nil {
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return err
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}
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w.mu.Lock()
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watch := w.watches.get(ino)
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w.mu.Unlock()
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if recurse && !watch.recurse {
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return fmt.Errorf("can't use \\... with non-recursive watch %q", pathname)
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}
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err = windows.CloseHandle(ino.handle)
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if err != nil {
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w.sendError(os.NewSyscallError("CloseHandle", err))
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}
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if watch == nil {
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return fmt.Errorf("%w: %s", ErrNonExistentWatch, pathname)
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}
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if pathname == dir {
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w.sendEvent(watch.path, "", watch.mask&sysFSIGNORED)
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watch.mask = 0
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} else {
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name := filepath.Base(pathname)
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w.sendEvent(filepath.Join(watch.path, name), "", watch.names[name]&sysFSIGNORED)
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delete(watch.names, name)
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}
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return w.startRead(watch)
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}
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// Must run within the I/O thread.
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func (w *readDirChangesW) deleteWatch(watch *watch) {
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for name, mask := range watch.names {
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if mask&provisional == 0 {
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w.sendEvent(filepath.Join(watch.path, name), "", mask&sysFSIGNORED)
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}
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delete(watch.names, name)
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}
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if watch.mask != 0 {
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if watch.mask&provisional == 0 {
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w.sendEvent(watch.path, "", watch.mask&sysFSIGNORED)
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}
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watch.mask = 0
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}
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}
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// Must run within the I/O thread.
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func (w *readDirChangesW) startRead(watch *watch) error {
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err := windows.CancelIo(watch.ino.handle)
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if err != nil {
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w.sendError(os.NewSyscallError("CancelIo", err))
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w.deleteWatch(watch)
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}
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mask := w.toWindowsFlags(watch.mask)
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for _, m := range watch.names {
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mask |= w.toWindowsFlags(m)
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}
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if mask == 0 {
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err := windows.CloseHandle(watch.ino.handle)
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if err != nil {
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w.sendError(os.NewSyscallError("CloseHandle", err))
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}
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w.mu.Lock()
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delete(w.watches[watch.ino.volume], watch.ino.index)
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w.mu.Unlock()
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return nil
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}
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// We need to pass the array, rather than the slice.
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hdr := (*reflect.SliceHeader)(unsafe.Pointer(&watch.buf))
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rdErr := windows.ReadDirectoryChanges(watch.ino.handle,
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(*byte)(unsafe.Pointer(hdr.Data)), uint32(hdr.Len),
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watch.recurse, mask, nil, &watch.ov, 0)
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if rdErr != nil {
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err := os.NewSyscallError("ReadDirectoryChanges", rdErr)
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if rdErr == windows.ERROR_ACCESS_DENIED && watch.mask&provisional == 0 {
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// Watched directory was probably removed
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w.sendEvent(watch.path, "", watch.mask&sysFSDELETESELF)
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err = nil
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}
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w.deleteWatch(watch)
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w.startRead(watch)
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return err
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}
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return nil
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}
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// readEvents reads from the I/O completion port, converts the
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// received events into Event objects and sends them via the Events channel.
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// Entry point to the I/O thread.
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func (w *readDirChangesW) readEvents() {
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var (
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n uint32
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key uintptr
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ov *windows.Overlapped
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)
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runtime.LockOSThread()
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for {
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// This error is handled after the watch == nil check below.
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qErr := windows.GetQueuedCompletionStatus(w.port, &n, &key, &ov, windows.INFINITE)
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watch := (*watch)(unsafe.Pointer(ov))
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if watch == nil {
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select {
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case ch := <-w.quit:
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w.mu.Lock()
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var indexes []indexMap
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for _, index := range w.watches {
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indexes = append(indexes, index)
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}
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w.mu.Unlock()
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for _, index := range indexes {
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for _, watch := range index {
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w.deleteWatch(watch)
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w.startRead(watch)
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}
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}
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err := windows.CloseHandle(w.port)
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if err != nil {
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err = os.NewSyscallError("CloseHandle", err)
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}
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close(w.Events)
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close(w.Errors)
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ch <- err
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return
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case in := <-w.input:
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switch in.op {
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case opAddWatch:
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in.reply <- w.addWatch(in.path, uint64(in.flags), in.bufsize)
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case opRemoveWatch:
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in.reply <- w.remWatch(in.path)
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}
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default:
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}
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continue
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}
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switch qErr {
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case nil:
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// No error
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case windows.ERROR_MORE_DATA:
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if watch == nil {
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w.sendError(errors.New("ERROR_MORE_DATA has unexpectedly null lpOverlapped buffer"))
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} else {
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// The i/o succeeded but the buffer is full.
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// In theory we should be building up a full packet.
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// In practice we can get away with just carrying on.
|
|
n = uint32(unsafe.Sizeof(watch.buf))
|
|
}
|
|
case windows.ERROR_ACCESS_DENIED:
|
|
// Watched directory was probably removed
|
|
w.sendEvent(watch.path, "", watch.mask&sysFSDELETESELF)
|
|
w.deleteWatch(watch)
|
|
w.startRead(watch)
|
|
continue
|
|
case windows.ERROR_OPERATION_ABORTED:
|
|
// CancelIo was called on this handle
|
|
continue
|
|
default:
|
|
w.sendError(os.NewSyscallError("GetQueuedCompletionPort", qErr))
|
|
continue
|
|
}
|
|
|
|
var offset uint32
|
|
for {
|
|
if n == 0 {
|
|
w.sendError(ErrEventOverflow)
|
|
break
|
|
}
|
|
|
|
// Point "raw" to the event in the buffer
|
|
raw := (*windows.FileNotifyInformation)(unsafe.Pointer(&watch.buf[offset]))
|
|
|
|
// Create a buf that is the size of the path name
|
|
size := int(raw.FileNameLength / 2)
|
|
var buf []uint16
|
|
// TODO: Use unsafe.Slice in Go 1.17; https://stackoverflow.com/questions/51187973
|
|
sh := (*reflect.SliceHeader)(unsafe.Pointer(&buf))
|
|
sh.Data = uintptr(unsafe.Pointer(&raw.FileName))
|
|
sh.Len = size
|
|
sh.Cap = size
|
|
name := windows.UTF16ToString(buf)
|
|
fullname := filepath.Join(watch.path, name)
|
|
|
|
if debug {
|
|
internal.Debug(fullname, raw.Action)
|
|
}
|
|
|
|
var mask uint64
|
|
switch raw.Action {
|
|
case windows.FILE_ACTION_REMOVED:
|
|
mask = sysFSDELETESELF
|
|
case windows.FILE_ACTION_MODIFIED:
|
|
mask = sysFSMODIFY
|
|
case windows.FILE_ACTION_RENAMED_OLD_NAME:
|
|
watch.rename = name
|
|
case windows.FILE_ACTION_RENAMED_NEW_NAME:
|
|
// Update saved path of all sub-watches.
|
|
old := filepath.Join(watch.path, watch.rename)
|
|
w.mu.Lock()
|
|
for _, watchMap := range w.watches {
|
|
for _, ww := range watchMap {
|
|
if strings.HasPrefix(ww.path, old) {
|
|
ww.path = filepath.Join(fullname, strings.TrimPrefix(ww.path, old))
|
|
}
|
|
}
|
|
}
|
|
w.mu.Unlock()
|
|
|
|
if watch.names[watch.rename] != 0 {
|
|
watch.names[name] |= watch.names[watch.rename]
|
|
delete(watch.names, watch.rename)
|
|
mask = sysFSMOVESELF
|
|
}
|
|
}
|
|
|
|
if raw.Action != windows.FILE_ACTION_RENAMED_NEW_NAME {
|
|
w.sendEvent(fullname, "", watch.names[name]&mask)
|
|
}
|
|
if raw.Action == windows.FILE_ACTION_REMOVED {
|
|
w.sendEvent(fullname, "", watch.names[name]&sysFSIGNORED)
|
|
delete(watch.names, name)
|
|
}
|
|
|
|
if watch.rename != "" && raw.Action == windows.FILE_ACTION_RENAMED_NEW_NAME {
|
|
w.sendEvent(fullname, filepath.Join(watch.path, watch.rename), watch.mask&w.toFSnotifyFlags(raw.Action))
|
|
} else {
|
|
w.sendEvent(fullname, "", watch.mask&w.toFSnotifyFlags(raw.Action))
|
|
}
|
|
|
|
if raw.Action == windows.FILE_ACTION_RENAMED_NEW_NAME {
|
|
w.sendEvent(filepath.Join(watch.path, watch.rename), "", watch.names[name]&mask)
|
|
}
|
|
|
|
// Move to the next event in the buffer
|
|
if raw.NextEntryOffset == 0 {
|
|
break
|
|
}
|
|
offset += raw.NextEntryOffset
|
|
|
|
// Error!
|
|
if offset >= n {
|
|
//lint:ignore ST1005 Windows should be capitalized
|
|
w.sendError(errors.New("Windows system assumed buffer larger than it is, events have likely been missed"))
|
|
break
|
|
}
|
|
}
|
|
|
|
if err := w.startRead(watch); err != nil {
|
|
w.sendError(err)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (w *readDirChangesW) toWindowsFlags(mask uint64) uint32 {
|
|
var m uint32
|
|
if mask&sysFSMODIFY != 0 {
|
|
m |= windows.FILE_NOTIFY_CHANGE_LAST_WRITE
|
|
}
|
|
if mask&(sysFSMOVE|sysFSCREATE|sysFSDELETE) != 0 {
|
|
m |= windows.FILE_NOTIFY_CHANGE_FILE_NAME | windows.FILE_NOTIFY_CHANGE_DIR_NAME
|
|
}
|
|
return m
|
|
}
|
|
|
|
func (w *readDirChangesW) toFSnotifyFlags(action uint32) uint64 {
|
|
switch action {
|
|
case windows.FILE_ACTION_ADDED:
|
|
return sysFSCREATE
|
|
case windows.FILE_ACTION_REMOVED:
|
|
return sysFSDELETE
|
|
case windows.FILE_ACTION_MODIFIED:
|
|
return sysFSMODIFY
|
|
case windows.FILE_ACTION_RENAMED_OLD_NAME:
|
|
return sysFSMOVEDFROM
|
|
case windows.FILE_ACTION_RENAMED_NEW_NAME:
|
|
return sysFSMOVEDTO
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func (w *readDirChangesW) xSupports(op Op) bool {
|
|
if op.Has(xUnportableOpen) || op.Has(xUnportableRead) ||
|
|
op.Has(xUnportableCloseWrite) || op.Has(xUnportableCloseRead) {
|
|
return false
|
|
}
|
|
return true
|
|
}
|