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Directory : /opt/golang/1.22.0/src/os/

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Current File : /opt/golang/1.22.0/src/os/removeall_at.go

// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build unix

package os

import (
	"internal/syscall/unix"
	"io"
	"syscall"
)

func removeAll(path string) error {
	if path == "" {
		// fail silently to retain compatibility with previous behavior
		// of RemoveAll. See issue 28830.
		return nil
	}

	// The rmdir system call does not permit removing ".",
	// so we don't permit it either.
	if endsWithDot(path) {
		return &PathError{Op: "RemoveAll", Path: path, Err: syscall.EINVAL}
	}

	// Simple case: if Remove works, we're done.
	err := Remove(path)
	if err == nil || IsNotExist(err) {
		return nil
	}

	// RemoveAll recurses by deleting the path base from
	// its parent directory
	parentDir, base := splitPath(path)

	parent, err := Open(parentDir)
	if IsNotExist(err) {
		// If parent does not exist, base cannot exist. Fail silently
		return nil
	}
	if err != nil {
		return err
	}
	defer parent.Close()

	if err := removeAllFrom(parent, base); err != nil {
		if pathErr, ok := err.(*PathError); ok {
			pathErr.Path = parentDir + string(PathSeparator) + pathErr.Path
			err = pathErr
		}
		return err
	}
	return nil
}

func removeAllFrom(parent *File, base string) error {
	parentFd := int(parent.Fd())
	// Simple case: if Unlink (aka remove) works, we're done.
	err := ignoringEINTR(func() error {
		return unix.Unlinkat(parentFd, base, 0)
	})
	if err == nil || IsNotExist(err) {
		return nil
	}

	// EISDIR means that we have a directory, and we need to
	// remove its contents.
	// EPERM or EACCES means that we don't have write permission on
	// the parent directory, but this entry might still be a directory
	// whose contents need to be removed.
	// Otherwise just return the error.
	if err != syscall.EISDIR && err != syscall.EPERM && err != syscall.EACCES {
		return &PathError{Op: "unlinkat", Path: base, Err: err}
	}

	// Is this a directory we need to recurse into?
	var statInfo syscall.Stat_t
	statErr := ignoringEINTR(func() error {
		return unix.Fstatat(parentFd, base, &statInfo, unix.AT_SYMLINK_NOFOLLOW)
	})
	if statErr != nil {
		if IsNotExist(statErr) {
			return nil
		}
		return &PathError{Op: "fstatat", Path: base, Err: statErr}
	}
	if statInfo.Mode&syscall.S_IFMT != syscall.S_IFDIR {
		// Not a directory; return the error from the unix.Unlinkat.
		return &PathError{Op: "unlinkat", Path: base, Err: err}
	}

	// Remove the directory's entries.
	var recurseErr error
	for {
		const reqSize = 1024
		var respSize int

		// Open the directory to recurse into
		file, err := openFdAt(parentFd, base)
		if err != nil {
			if IsNotExist(err) {
				return nil
			}
			recurseErr = &PathError{Op: "openfdat", Path: base, Err: err}
			break
		}

		for {
			numErr := 0

			names, readErr := file.Readdirnames(reqSize)
			// Errors other than EOF should stop us from continuing.
			if readErr != nil && readErr != io.EOF {
				file.Close()
				if IsNotExist(readErr) {
					return nil
				}
				return &PathError{Op: "readdirnames", Path: base, Err: readErr}
			}

			respSize = len(names)
			for _, name := range names {
				err := removeAllFrom(file, name)
				if err != nil {
					if pathErr, ok := err.(*PathError); ok {
						pathErr.Path = base + string(PathSeparator) + pathErr.Path
					}
					numErr++
					if recurseErr == nil {
						recurseErr = err
					}
				}
			}

			// If we can delete any entry, break to start new iteration.
			// Otherwise, we discard current names, get next entries and try deleting them.
			if numErr != reqSize {
				break
			}
		}

		// Removing files from the directory may have caused
		// the OS to reshuffle it. Simply calling Readdirnames
		// again may skip some entries. The only reliable way
		// to avoid this is to close and re-open the
		// directory. See issue 20841.
		file.Close()

		// Finish when the end of the directory is reached
		if respSize < reqSize {
			break
		}
	}

	// Remove the directory itself.
	unlinkError := ignoringEINTR(func() error {
		return unix.Unlinkat(parentFd, base, unix.AT_REMOVEDIR)
	})
	if unlinkError == nil || IsNotExist(unlinkError) {
		return nil
	}

	if recurseErr != nil {
		return recurseErr
	}
	return &PathError{Op: "unlinkat", Path: base, Err: unlinkError}
}

// openFdAt opens path relative to the directory in fd.
// Other than that this should act like openFileNolog.
// This acts like openFileNolog rather than OpenFile because
// we are going to (try to) remove the file.
// The contents of this file are not relevant for test caching.
func openFdAt(dirfd int, name string) (*File, error) {
	var r int
	for {
		var e error
		r, e = unix.Openat(dirfd, name, O_RDONLY|syscall.O_CLOEXEC, 0)
		if e == nil {
			break
		}

		// See comment in openFileNolog.
		if e == syscall.EINTR {
			continue
		}

		return nil, e
	}

	if !supportsCloseOnExec {
		syscall.CloseOnExec(r)
	}

	// We use kindNoPoll because we know that this is a directory.
	return newFile(r, name, kindNoPoll), nil
}

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