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FileManager.swift
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// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2019 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
#if !canImport(Darwin) && !os(FreeBSD)
// The values do not matter as long as they are nonzero.
fileprivate let UF_IMMUTABLE: Int32 = 1
fileprivate let SF_IMMUTABLE: Int32 = 1
fileprivate let UF_APPEND: Int32 = 1
fileprivate let UF_HIDDEN: Int32 = 1
#endif
import CoreFoundation
open class FileManager : NSObject {
/* Returns the default singleton instance.
*/
private static let _default = FileManager()
open class var `default`: FileManager {
get {
return _default
}
}
/// Returns an array of URLs that identify the mounted volumes available on the device.
open func mountedVolumeURLs(includingResourceValuesForKeys propertyKeys: [URLResourceKey]?, options: VolumeEnumerationOptions = []) -> [URL]? {
return _mountedVolumeURLs(includingResourceValuesForKeys: propertyKeys, options: options)
}
/* Returns an NSArray of NSURLs identifying the the directory entries.
If the directory contains no entries, this method will return the empty array. When an array is specified for the 'keys' parameter, the specified property values will be pre-fetched and cached with each enumerated URL.
This method always does a shallow enumeration of the specified directory (i.e. it always acts as if NSDirectoryEnumerationSkipsSubdirectoryDescendants has been specified). If you need to perform a deep enumeration, use -[NSFileManager enumeratorAtURL:includingPropertiesForKeys:options:errorHandler:].
If you wish to only receive the URLs and no other attributes, then pass '0' for 'options' and an empty NSArray ('[NSArray array]') for 'keys'. If you wish to have the property caches of the vended URLs pre-populated with a default set of attributes, then pass '0' for 'options' and 'nil' for 'keys'.
*/
open func contentsOfDirectory(at url: URL, includingPropertiesForKeys keys: [URLResourceKey]?, options mask: DirectoryEnumerationOptions = []) throws -> [URL] {
var error : Error? = nil
let e = self.enumerator(at: url, includingPropertiesForKeys: keys, options: mask.union(.skipsSubdirectoryDescendants)) { (url, err) -> Bool in
error = err
return false
}
var result = [URL]()
if let e = e {
for url in e {
result.append(url as! URL)
}
if let error = error {
throw error
}
}
return result
}
internal enum _SearchPathDomain {
case system
case local
case network
case user
static let correspondingValues: [UInt: _SearchPathDomain] = [
SearchPathDomainMask.systemDomainMask.rawValue: .system,
SearchPathDomainMask.localDomainMask.rawValue: .local,
SearchPathDomainMask.networkDomainMask.rawValue: .network,
SearchPathDomainMask.userDomainMask.rawValue: .user,
]
static let searchOrder: [SearchPathDomainMask] = [
.systemDomainMask,
.localDomainMask,
.networkDomainMask,
.userDomainMask,
]
init?(_ domainMask: SearchPathDomainMask) {
if let value = _SearchPathDomain.correspondingValues[domainMask.rawValue] {
self = value
} else {
return nil
}
}
static func allInSearchOrder(from domainMask: SearchPathDomainMask) -> [_SearchPathDomain] {
var domains: [_SearchPathDomain] = []
for bit in _SearchPathDomain.searchOrder {
if domainMask.contains(bit) {
domains.append(_SearchPathDomain.correspondingValues[bit.rawValue]!)
}
}
return domains
}
}
/* -URLsForDirectory:inDomains: is analogous to NSSearchPathForDirectoriesInDomains(), but returns an array of NSURL instances for use with URL-taking APIs. This API is suitable when you need to search for a file or files which may live in one of a variety of locations in the domains specified.
*/
open func urls(for directory: SearchPathDirectory, in domainMask: SearchPathDomainMask) -> [URL] {
return _urls(for: directory, in: domainMask)
}
internal lazy var xdgHomeDirectory: String = {
let key = "HOME="
if let contents = try? String(contentsOfFile: "/etc/default/useradd", encoding: .utf8) {
for line in contents.components(separatedBy: "\n") {
if line.hasPrefix(key) {
let index = line.index(line.startIndex, offsetBy: key.count)
let str = String(line[index...]) as NSString
let homeDir = str.trimmingCharacters(in: CharacterSet.whitespaces)
if homeDir.count > 0 {
return homeDir
}
}
}
}
return "/home"
}()
private enum URLForDirectoryError: Error {
case directoryUnknown
}
/* -URLForDirectory:inDomain:appropriateForURL:create:error: is a URL-based replacement for FSFindFolder(). It allows for the specification and (optional) creation of a specific directory for a particular purpose (e.g. the replacement of a particular item on disk, or a particular Library directory.
You may pass only one of the values from the NSSearchPathDomainMask enumeration, and you may not pass NSAllDomainsMask.
*/
open func url(for directory: SearchPathDirectory, in domain: SearchPathDomainMask, appropriateFor reference: URL?, create
shouldCreate: Bool) throws -> URL {
var url: URL
if directory == .itemReplacementDirectory {
// We mimic Darwin here — .itemReplacementDirectory has a number of requirements for use and not meeting them is a programmer error and should panic out.
precondition(domain == .userDomainMask)
let referenceURL = reference!
// If the temporary directory and the reference URL are on the same device, use a subdirectory in the temporary directory. Otherwise, use a temporary directory at the same path as the filesystem that contains this file if it's writable. Fall back to the temporary directory if the latter doesn't work.
let temporaryDirectory = URL(fileURLWithPath: NSTemporaryDirectory())
let useTemporaryDirectory: Bool
let maybeVolumeIdentifier = try? temporaryDirectory.resourceValues(forKeys: [.volumeIdentifierKey]).volumeIdentifier as? AnyHashable
let maybeReferenceVolumeIdentifier = try? referenceURL.resourceValues(forKeys: [.volumeIdentifierKey]).volumeIdentifier as? AnyHashable
if let volumeIdentifier = maybeVolumeIdentifier,
let referenceVolumeIdentifier = maybeReferenceVolumeIdentifier {
useTemporaryDirectory = volumeIdentifier == referenceVolumeIdentifier
} else {
useTemporaryDirectory = !isWritableFile(atPath: referenceURL.deletingPathExtension().path)
}
// This is the same name Darwin uses.
if useTemporaryDirectory {
url = temporaryDirectory.appendingPathComponent("TemporaryItems")
} else {
url = referenceURL.deletingPathExtension()
}
} else {
let urls = self.urls(for: directory, in: domain)
guard let theURL = urls.first else {
// On Apple OSes, this case returns nil without filling in the error parameter; Swift then synthesizes an error rather than trap.
// We simulate that behavior by throwing a private error.
throw URLForDirectoryError.directoryUnknown
}
url = theURL
}
var nameStorage: String?
func itemReplacementDirectoryName(forAttempt attempt: Int) -> String {
let name: String
if let someName = nameStorage {
name = someName
} else {
// Sanitize the process name for filesystem use:
var someName = ProcessInfo.processInfo.processName
let characterSet = CharacterSet.alphanumerics.inverted
while let whereIsIt = someName.rangeOfCharacter(from: characterSet, options: [], range: nil) {
someName.removeSubrange(whereIsIt)
}
name = someName
nameStorage = someName
}
if attempt == 0 {
return "(A Document Being Saved By \(name))"
} else {
return "(A Document Being Saved By \(name) \(attempt + 1)"
}
}
// To avoid races, on Darwin, the item replacement directory is _ALWAYS_ created, even if create is false.
if shouldCreate || directory == .itemReplacementDirectory {
var attributes: [FileAttributeKey : Any] = [:]
switch _SearchPathDomain(domain) {
case .some(.user):
attributes[.posixPermissions] = 0o700
case .some(.system):
attributes[.posixPermissions] = 0o755
attributes[.ownerAccountID] = 0 // root
#if os(macOS) || os(iOS) || os(watchOS) || os(tvOS)
attributes[.ownerAccountID] = 80 // on Darwin, the admin group's fixed ID.
#endif
default:
break
}
if directory == .itemReplacementDirectory {
try createDirectory(at: url, withIntermediateDirectories: true, attributes: attributes)
var attempt = 0
while true {
do {
let attemptedURL = url.appendingPathComponent(itemReplacementDirectoryName(forAttempt: attempt))
try createDirectory(at: attemptedURL, withIntermediateDirectories: false)
url = attemptedURL
break
} catch {
if let error = error as? NSError, error.domain == NSCocoaErrorDomain, error.code == CocoaError.fileWriteFileExists.rawValue {
attempt += 1
} else {
throw error
}
}
}
} else {
try createDirectory(at: url, withIntermediateDirectories: true, attributes: attributes)
}
}
return url
}
/* Sets 'outRelationship' to NSURLRelationshipContains if the directory at 'directoryURL' directly or indirectly contains the item at 'otherURL', meaning 'directoryURL' is found while enumerating parent URLs starting from 'otherURL'. Sets 'outRelationship' to NSURLRelationshipSame if 'directoryURL' and 'otherURL' locate the same item, meaning they have the same NSURLFileResourceIdentifierKey value. If 'directoryURL' is not a directory, or does not contain 'otherURL' and they do not locate the same file, then sets 'outRelationship' to NSURLRelationshipOther. If an error occurs, returns NO and sets 'error'.
*/
open func getRelationship(_ outRelationship: UnsafeMutablePointer<URLRelationship>, ofDirectoryAt directoryURL: URL, toItemAt otherURL: URL) throws {
let from = try _canonicalizedPath(toFileAtPath: directoryURL.path)
let to = try _canonicalizedPath(toFileAtPath: otherURL.path)
if from == to {
outRelationship.pointee = .same
} else if to.hasPrefix(from) && to.count > from.count + 1 /* the contained file's canonicalized path must contain at least one path separator and one filename component */ {
let character = to[to.index(to.startIndex, offsetBy: from.length)]
if character == "/" || character == "\\" {
outRelationship.pointee = .contains
} else {
outRelationship.pointee = .other
}
} else {
outRelationship.pointee = .other
}
}
/* Similar to -[NSFileManager getRelationship:ofDirectoryAtURL:toItemAtURL:error:], except that the directory is instead defined by an NSSearchPathDirectory and NSSearchPathDomainMask. Pass 0 for domainMask to instruct the method to automatically choose the domain appropriate for 'url'. For example, to discover if a file is contained by a Trash directory, call [fileManager getRelationship:&result ofDirectory:NSTrashDirectory inDomain:0 toItemAtURL:url error:&error].
*/
open func getRelationship(_ outRelationship: UnsafeMutablePointer<URLRelationship>, of directory: SearchPathDirectory, in domainMask: SearchPathDomainMask, toItemAt url: URL) throws {
let actualMask: SearchPathDomainMask
if domainMask.isEmpty {
switch directory {
case .applicationDirectory: fallthrough
case .demoApplicationDirectory: fallthrough
case .developerApplicationDirectory: fallthrough
case .adminApplicationDirectory: fallthrough
case .developerDirectory: fallthrough
case .userDirectory: fallthrough
case .documentationDirectory:
actualMask = .localDomainMask
case .libraryDirectory: fallthrough
case .autosavedInformationDirectory: fallthrough
case .documentDirectory: fallthrough
case .desktopDirectory: fallthrough
case .cachesDirectory: fallthrough
case .applicationSupportDirectory: fallthrough
case .downloadsDirectory: fallthrough
case .inputMethodsDirectory: fallthrough
case .moviesDirectory: fallthrough
case .musicDirectory: fallthrough
case .picturesDirectory: fallthrough
case .sharedPublicDirectory: fallthrough
case .preferencePanesDirectory: fallthrough
case .applicationScriptsDirectory: fallthrough
case .itemReplacementDirectory: fallthrough
case .trashDirectory:
actualMask = .userDomainMask
case .coreServiceDirectory: fallthrough
case .printerDescriptionDirectory: fallthrough
case .allApplicationsDirectory: fallthrough
case .allLibrariesDirectory:
actualMask = .systemDomainMask
}
} else {
actualMask = domainMask
}
try getRelationship(outRelationship, ofDirectoryAt: try self.url(for: directory, in: actualMask, appropriateFor: url, create: false), toItemAt: url)
}
/* createDirectoryAtURL:withIntermediateDirectories:attributes:error: creates a directory at the specified URL. If you pass 'NO' for withIntermediateDirectories, the directory must not exist at the time this call is made. Passing 'YES' for withIntermediateDirectories will create any necessary intermediate directories. This method returns YES if all directories specified in 'url' were created and attributes were set. Directories are created with attributes specified by the dictionary passed to 'attributes'. If no dictionary is supplied, directories are created according to the umask of the process. This method returns NO if a failure occurs at any stage of the operation. If an error parameter was provided, a presentable NSError will be returned by reference.
*/
open func createDirectory(at url: URL, withIntermediateDirectories createIntermediates: Bool, attributes: [FileAttributeKey : Any]? = [:]) throws {
guard url.isFileURL else {
throw NSError(domain: NSCocoaErrorDomain, code: CocoaError.fileWriteUnsupportedScheme.rawValue, userInfo: [NSURLErrorKey : url])
}
try self.createDirectory(atPath: url.path, withIntermediateDirectories: createIntermediates, attributes: attributes)
}
/* createSymbolicLinkAtURL:withDestinationURL:error: returns YES if the symbolic link that point at 'destURL' was able to be created at the location specified by 'url'. 'destURL' is always resolved against its base URL, if it has one. If 'destURL' has no base URL and it's 'relativePath' is indeed a relative path, then a relative symlink will be created. If this method returns NO, the link was unable to be created and an NSError will be returned by reference in the 'error' parameter. This method does not traverse a terminal symlink.
*/
open func createSymbolicLink(at url: URL, withDestinationURL destURL: URL) throws {
guard url.isFileURL else {
throw NSError(domain: NSCocoaErrorDomain, code: CocoaError.fileWriteUnsupportedScheme.rawValue, userInfo: [NSURLErrorKey : url])
}
guard destURL.scheme == nil || destURL.isFileURL else {
throw NSError(domain: NSCocoaErrorDomain, code: CocoaError.fileWriteUnsupportedScheme.rawValue, userInfo: [NSURLErrorKey : destURL])
}
try self.createSymbolicLink(atPath: url.path, withDestinationPath: destURL.path)
}
/* Instances of FileManager may now have delegates. Each instance has one delegate, and the delegate is not retained. In versions of Mac OS X prior to 10.5, the behavior of calling [[NSFileManager alloc] init] was undefined. In Mac OS X 10.5 "Leopard" and later, calling [[NSFileManager alloc] init] returns a new instance of an FileManager.
*/
open weak var delegate: FileManagerDelegate?
/* setAttributes:ofItemAtPath:error: returns YES when the attributes specified in the 'attributes' dictionary are set successfully on the item specified by 'path'. If this method returns NO, a presentable NSError will be provided by-reference in the 'error' parameter. If no error is required, you may pass 'nil' for the error.
This method replaces changeFileAttributes:atPath:.
*/
open func setAttributes(_ attributes: [FileAttributeKey : Any], ofItemAtPath path: String) throws {
try _setAttributes(attributes, ofItemAtPath: path)
}
internal func _setAttributes(_ attributeValues: [FileAttributeKey : Any], ofItemAtPath path: String, includingPrivateAttributes: Bool = false) throws {
var attributes = Set(attributeValues.keys)
if !includingPrivateAttributes {
attributes.formIntersection(FileAttributeKey.allPublicKeys)
}
try _fileSystemRepresentation(withPath: path, { fsRep in
var flagsToSet: UInt32 = 0
var flagsToUnset: UInt32 = 0
var newModificationDate: Date?
var newAccessDate: Date?
for attribute in attributes {
func prepareToSetOrUnsetFlag(_ flag: Int32) {
guard let shouldSet = attributeValues[attribute] as? Bool else {
fatalError("Can't set \(attribute) to \(attributeValues[attribute] as Any?)")
}
if shouldSet {
flagsToSet |= UInt32(flag)
} else {
flagsToUnset |= UInt32(flag)
}
}
switch attribute {
case .posixPermissions:
guard let number = attributeValues[attribute] as? NSNumber else {
fatalError("Can't set file permissions to \(attributeValues[attribute] as Any?)")
}
#if os(macOS) || os(iOS)
let modeT = number.uint16Value
#elseif os(Linux) || os(Android) || os(Windows)
let modeT = number.uint32Value
#endif
guard chmod(fsRep, mode_t(modeT)) == 0 else {
throw _NSErrorWithErrno(errno, reading: false, path: path)
}
case .modificationDate: fallthrough
case ._accessDate:
#if os(Windows)
// Setting this attribute is unsupported on these platforms.
throw NSError(domain: NSCocoaErrorDomain, code: CocoaError.fileWriteUnknown.rawValue)
#else
guard let providedDate = attributeValues[attribute] as? Date else {
fatalError("Can't set \(attribute) to \(attributeValues[attribute] as Any?)")
}
if attribute == .modificationDate {
newModificationDate = providedDate
} else if attribute == ._accessDate {
newAccessDate = providedDate
}
#endif
case .immutable: fallthrough
case ._userImmutable:
prepareToSetOrUnsetFlag(UF_IMMUTABLE)
case ._systemImmutable:
prepareToSetOrUnsetFlag(SF_IMMUTABLE)
case .appendOnly:
prepareToSetOrUnsetFlag(UF_APPEND)
case ._hidden:
prepareToSetOrUnsetFlag(UF_HIDDEN)
// FIXME: On Darwin, these can be set with setattrlist(); and of course chown/chgrp on other OSes.
case .ownerAccountID: fallthrough
case .ownerAccountName: fallthrough
case .groupOwnerAccountID: fallthrough
case .groupOwnerAccountName: fallthrough
case .creationDate: fallthrough
case .extensionHidden:
// Setting these attributes is unsupported (for now) in swift-corelibs-foundation
throw NSError(domain: NSCocoaErrorDomain, code: CocoaError.fileWriteUnknown.rawValue)
default:
fatalError("This attribute is unknown or cannot be set: \(attribute)")
}
}
if flagsToSet != 0 || flagsToUnset != 0 {
#if !canImport(Darwin) && !os(FreeBSD)
// Setting these attributes is unsupported on these platforms.
throw NSError(domain: NSCocoaErrorDomain, code: CocoaError.fileWriteUnknown.rawValue)
#else
let stat = try _lstatFile(atPath: path, withFileSystemRepresentation: fsRep)
var flags = stat.st_flags
flags |= flagsToSet
flags &= ~flagsToUnset
guard chflags(fsRep, flags) == 0 else {
throw _NSErrorWithErrno(errno, reading: false, path: path)
}
#endif
}
if newModificationDate != nil || newAccessDate != nil {
// Set dates as the very last step, to avoid other operations overwriting these values:
try _updateTimes(atPath: path, withFileSystemRepresentation: fsRep, accessTime: newAccessDate, modificationTime: newModificationDate)
}
})
}
/* createDirectoryAtPath:withIntermediateDirectories:attributes:error: creates a directory at the specified path. If you pass 'NO' for createIntermediates, the directory must not exist at the time this call is made. Passing 'YES' for 'createIntermediates' will create any necessary intermediate directories. This method returns YES if all directories specified in 'path' were created and attributes were set. Directories are created with attributes specified by the dictionary passed to 'attributes'. If no dictionary is supplied, directories are created according to the umask of the process. This method returns NO if a failure occurs at any stage of the operation. If an error parameter was provided, a presentable NSError will be returned by reference.
This method replaces createDirectoryAtPath:attributes:
*/
open func createDirectory(atPath path: String, withIntermediateDirectories createIntermediates: Bool, attributes: [FileAttributeKey : Any]? = [:]) throws {
return try _createDirectory(atPath: path, withIntermediateDirectories: createIntermediates, attributes: attributes)
}
/**
Performs a shallow search of the specified directory and returns the paths of any contained items.
This method performs a shallow search of the directory and therefore does not traverse symbolic links or return the contents of any subdirectories. This method also does not return URLs for the current directory (“.”), parent directory (“..”) but it does return other hidden files (files that begin with a period character).
The order of the files in the returned array is undefined.
- Parameter path: The path to the directory whose contents you want to enumerate.
- Throws: `NSError` if the directory does not exist, this error is thrown with the associated error code.
- Returns: An array of String each of which identifies a file, directory, or symbolic link contained in `path`. The order of the files returned is undefined.
*/
open func contentsOfDirectory(atPath path: String) throws -> [String] {
var contents: [String] = []
try _contentsOfDir(atPath: path, { (entryName, entryType) throws in
contents.append(entryName)
})
return contents
}
/**
Performs a deep enumeration of the specified directory and returns the paths of all of the contained subdirectories.
This method recurses the specified directory and its subdirectories. The method skips the “.” and “..” directories at each level of the recursion.
Because this method recurses the directory’s contents, you might not want to use it in performance-critical code. Instead, consider using the enumeratorAtURL:includingPropertiesForKeys:options:errorHandler: or enumeratorAtPath: method to enumerate the directory contents yourself. Doing so gives you more control over the retrieval of items and more opportunities to abort the enumeration or perform other tasks at the same time.
- Parameter path: The path of the directory to list.
- Throws: `NSError` if the directory does not exist, this error is thrown with the associated error code.
- Returns: An array of NSString objects, each of which contains the path of an item in the directory specified by path. If path is a symbolic link, this method traverses the link. This method returns nil if it cannot retrieve the device of the linked-to file.
*/
open func subpathsOfDirectory(atPath path: String) throws -> [String] {
return try _subpathsOfDirectory(atPath: path)
}
/* attributesOfItemAtPath:error: returns an NSDictionary of key/value pairs containing the attributes of the item (file, directory, symlink, etc.) at the path in question. If this method returns 'nil', an NSError will be returned by reference in the 'error' parameter. This method does not traverse a terminal symlink.
This method replaces fileAttributesAtPath:traverseLink:.
*/
open func attributesOfItem(atPath path: String) throws -> [FileAttributeKey : Any] {
return try _attributesOfItem(atPath: path)
}
internal func _attributesOfItem(atPath path: String, includingPrivateAttributes: Bool = false) throws -> [FileAttributeKey: Any] {
var result: [FileAttributeKey:Any] = [:]
#if os(Linux)
let (s, creationDate) = try _statxFile(atPath: path)
result[.creationDate] = creationDate
#else
let s = try _lstatFile(atPath: path)
#endif
result[.size] = NSNumber(value: UInt64(s.st_size))
result[.modificationDate] = s.lastModificationDate
if includingPrivateAttributes {
result[._accessDate] = s.lastAccessDate
}
result[.posixPermissions] = NSNumber(value: _filePermissionsMask(mode: UInt32(s.st_mode)))
result[.referenceCount] = NSNumber(value: UInt64(s.st_nlink))
result[.systemNumber] = NSNumber(value: UInt64(s.st_dev))
result[.systemFileNumber] = NSNumber(value: UInt64(s.st_ino))
#if os(Windows)
result[.deviceIdentifier] = NSNumber(value: UInt64(s.st_rdev))
let type = FileAttributeType(attributes: try windowsFileAttributes(atPath: path), atPath: path)
#else
if let pwd = getpwuid(s.st_uid), pwd.pointee.pw_name != nil {
let name = String(cString: pwd.pointee.pw_name)
result[.ownerAccountName] = name
}
if let grd = getgrgid(s.st_gid), grd.pointee.gr_name != nil {
let name = String(cString: grd.pointee.gr_name)
result[.groupOwnerAccountName] = name
}
let type = FileAttributeType(statMode: s.st_mode)
#endif
result[.type] = type
if type == .typeBlockSpecial || type == .typeCharacterSpecial {
result[.deviceIdentifier] = NSNumber(value: UInt64(s.st_rdev))
}
#if canImport(Darwin)
if (s.st_flags & UInt32(UF_IMMUTABLE | SF_IMMUTABLE)) != 0 {
result[.immutable] = NSNumber(value: true)
}
if includingPrivateAttributes {
result[._userImmutable] = (s.st_flags & UInt32(UF_IMMUTABLE)) != 0
result[._systemImmutable] = (s.st_flags & UInt32(SF_IMMUTABLE)) != 0
result[._hidden] = (s.st_flags & UInt32(UF_HIDDEN)) != 0
}
if (s.st_flags & UInt32(UF_APPEND | SF_APPEND)) != 0 {
result[.appendOnly] = NSNumber(value: true)
}
#endif
result[.ownerAccountID] = NSNumber(value: UInt64(s.st_uid))
result[.groupOwnerAccountID] = NSNumber(value: UInt64(s.st_gid))
return result
}
/* attributesOfFileSystemForPath:error: returns an NSDictionary of key/value pairs containing the attributes of the filesystem containing the provided path. If this method returns 'nil', an NSError will be returned by reference in the 'error' parameter. This method does not traverse a terminal symlink.
This method replaces fileSystemAttributesAtPath:.
*/
open func attributesOfFileSystem(forPath path: String) throws -> [FileAttributeKey : Any] {
return try _attributesOfFileSystem(forPath: path)
}
/* createSymbolicLinkAtPath:withDestination:error: returns YES if the symbolic link that point at 'destPath' was able to be created at the location specified by 'path'. If this method returns NO, the link was unable to be created and an NSError will be returned by reference in the 'error' parameter. This method does not traverse a terminal symlink.
This method replaces createSymbolicLinkAtPath:pathContent:
*/
open func createSymbolicLink(atPath path: String, withDestinationPath destPath: String) throws {
return try _createSymbolicLink(atPath: path, withDestinationPath: destPath)
}
/* destinationOfSymbolicLinkAtPath:error: returns a String containing the path of the item pointed at by the symlink specified by 'path'. If this method returns 'nil', an NSError will be thrown.
This method replaces pathContentOfSymbolicLinkAtPath:
*/
open func destinationOfSymbolicLink(atPath path: String) throws -> String {
return try _destinationOfSymbolicLink(atPath: path)
}
internal func extraErrorInfo(srcPath: String?, dstPath: String?, userVariant: String?) -> [String : Any] {
var result = [String : Any]()
result["NSSourceFilePathErrorKey"] = srcPath
result["NSDestinationFilePath"] = dstPath
result["NSUserStringVariant"] = userVariant.map(NSArray.init(object:))
return result
}
internal func shouldProceedAfterError(_ error: Error, copyingItemAtPath path: String, toPath: String, isURL: Bool) -> Bool {
guard let delegate = self.delegate else { return false }
if isURL {
return delegate.fileManager(self, shouldProceedAfterError: error, copyingItemAt: URL(fileURLWithPath: path), to: URL(fileURLWithPath: toPath))
} else {
return delegate.fileManager(self, shouldProceedAfterError: error, copyingItemAtPath: path, toPath: toPath)
}
}
internal func shouldCopyItemAtPath(_ path: String, toPath: String, isURL: Bool) -> Bool {
guard let delegate = self.delegate else { return true }
if isURL {
return delegate.fileManager(self, shouldCopyItemAt: URL(fileURLWithPath: path), to: URL(fileURLWithPath: toPath))
} else {
return delegate.fileManager(self, shouldCopyItemAtPath: path, toPath: toPath)
}
}
fileprivate func _copyItem(atPath srcPath: String, toPath dstPath: String, isURL: Bool) throws {
try _copyOrLinkDirectoryHelper(atPath: srcPath, toPath: dstPath) { (srcPath, dstPath, fileType) in
guard shouldCopyItemAtPath(srcPath, toPath: dstPath, isURL: isURL) else {
return
}
do {
switch fileType {
case .typeRegular:
try _copyRegularFile(atPath: srcPath, toPath: dstPath)
case .typeSymbolicLink:
try _copySymlink(atPath: srcPath, toPath: dstPath)
default:
break
}
} catch {
if !shouldProceedAfterError(error, copyingItemAtPath: srcPath, toPath: dstPath, isURL: isURL) {
throw error
}
}
}
}
internal func shouldProceedAfterError(_ error: Error, movingItemAtPath path: String, toPath: String, isURL: Bool) -> Bool {
guard let delegate = self.delegate else { return false }
if isURL {
return delegate.fileManager(self, shouldProceedAfterError: error, movingItemAt: URL(fileURLWithPath: path), to: URL(fileURLWithPath: toPath))
} else {
return delegate.fileManager(self, shouldProceedAfterError: error, movingItemAtPath: path, toPath: toPath)
}
}
internal func shouldMoveItemAtPath(_ path: String, toPath: String, isURL: Bool) -> Bool {
guard let delegate = self.delegate else { return true }
if isURL {
return delegate.fileManager(self, shouldMoveItemAt: URL(fileURLWithPath: path), to: URL(fileURLWithPath: toPath))
} else {
return delegate.fileManager(self, shouldMoveItemAtPath: path, toPath: toPath)
}
}
internal func shouldProceedAfterError(_ error: Error, linkingItemAtPath path: String, toPath: String, isURL: Bool) -> Bool {
guard let delegate = self.delegate else { return false }
if isURL {
return delegate.fileManager(self, shouldProceedAfterError: error, linkingItemAt: URL(fileURLWithPath: path), to: URL(fileURLWithPath: toPath))
} else {
return delegate.fileManager(self, shouldProceedAfterError: error, linkingItemAtPath: path, toPath: toPath)
}
}
internal func shouldLinkItemAtPath(_ path: String, toPath: String, isURL: Bool) -> Bool {
guard let delegate = self.delegate else { return true }
if isURL {
return delegate.fileManager(self, shouldLinkItemAt: URL(fileURLWithPath: path), to: URL(fileURLWithPath: toPath))
} else {
return delegate.fileManager(self, shouldLinkItemAtPath: path, toPath: toPath)
}
}
internal func shouldProceedAfterError(_ error: Error, removingItemAtPath path: String, isURL: Bool) -> Bool {
guard let delegate = self.delegate else { return false }
if isURL {
return delegate.fileManager(self, shouldProceedAfterError: error, removingItemAt: URL(fileURLWithPath: path))
} else {
return delegate.fileManager(self, shouldProceedAfterError: error, removingItemAtPath: path)
}
}
internal func shouldRemoveItemAtPath(_ path: String, isURL: Bool) -> Bool {
guard let delegate = self.delegate else { return true }
if isURL {
return delegate.fileManager(self, shouldRemoveItemAt: URL(fileURLWithPath: path))
} else {
return delegate.fileManager(self, shouldRemoveItemAtPath: path)
}
}
open func copyItem(atPath srcPath: String, toPath dstPath: String) throws {
try _copyItem(atPath: srcPath, toPath: dstPath, isURL: false)
}
open func moveItem(atPath srcPath: String, toPath dstPath: String) throws {
try _moveItem(atPath: srcPath, toPath: dstPath, isURL: false)
}
open func linkItem(atPath srcPath: String, toPath dstPath: String) throws {
try _linkItem(atPath: srcPath, toPath: dstPath, isURL: false)
}
open func removeItem(atPath path: String) throws {
try _removeItem(atPath: path, isURL: false)
}
open func copyItem(at srcURL: URL, to dstURL: URL) throws {
guard srcURL.isFileURL else {
throw NSError(domain: NSCocoaErrorDomain, code: CocoaError.fileWriteUnsupportedScheme.rawValue, userInfo: [NSURLErrorKey : srcURL])
}
guard dstURL.isFileURL else {
throw NSError(domain: NSCocoaErrorDomain, code: CocoaError.fileWriteUnsupportedScheme.rawValue, userInfo: [NSURLErrorKey : dstURL])
}
try _copyItem(atPath: srcURL.path, toPath: dstURL.path, isURL: true)
}
open func moveItem(at srcURL: URL, to dstURL: URL) throws {
guard srcURL.isFileURL else {
throw NSError(domain: NSCocoaErrorDomain, code: CocoaError.fileWriteUnsupportedScheme.rawValue, userInfo: [NSURLErrorKey : srcURL])
}
guard dstURL.isFileURL else {
throw NSError(domain: NSCocoaErrorDomain, code: CocoaError.fileWriteUnsupportedScheme.rawValue, userInfo: [NSURLErrorKey : dstURL])
}
try _moveItem(atPath: srcURL.path, toPath: dstURL.path, isURL: true)
}
open func linkItem(at srcURL: URL, to dstURL: URL) throws {
guard srcURL.isFileURL else {
throw NSError(domain: NSCocoaErrorDomain, code: CocoaError.fileWriteUnsupportedScheme.rawValue, userInfo: [NSURLErrorKey : srcURL])
}
guard dstURL.isFileURL else {
throw NSError(domain: NSCocoaErrorDomain, code: CocoaError.fileWriteUnsupportedScheme.rawValue, userInfo: [NSURLErrorKey : dstURL])
}
try _linkItem(atPath: srcURL.path, toPath: dstURL.path, isURL: true)
}
open func removeItem(at url: URL) throws {
guard url.isFileURL else {
throw NSError(domain: NSCocoaErrorDomain, code: CocoaError.fileWriteUnsupportedScheme.rawValue, userInfo: [NSURLErrorKey : url])
}
try _removeItem(atPath: url.path, isURL: true)
}
/* Process working directory management. Despite the fact that these are instance methods on FileManager, these methods report and change (respectively) the working directory for the entire process. Developers are cautioned that doing so is fraught with peril.
*/
open var currentDirectoryPath: String {
return _currentDirectoryPath()
}
@discardableResult
open func changeCurrentDirectoryPath(_ path: String) -> Bool {
return _changeCurrentDirectoryPath(path)
}
/* The following methods are of limited utility. Attempting to predicate behavior based on the current state of the filesystem or a particular file on the filesystem is encouraging odd behavior in the face of filesystem race conditions. It's far better to attempt an operation (like loading a file or creating a directory) and handle the error gracefully than it is to try to figure out ahead of time whether the operation will succeed.
*/
open func fileExists(atPath path: String) -> Bool {
return _fileExists(atPath: path, isDirectory: nil)
}
open func fileExists(atPath path: String, isDirectory: UnsafeMutablePointer<ObjCBool>?) -> Bool {
return _fileExists(atPath: path, isDirectory: isDirectory)
}
open func isReadableFile(atPath path: String) -> Bool {
return _isReadableFile(atPath: path)
}
open func isWritableFile(atPath path: String) -> Bool {
return _isWritableFile(atPath: path)
}
open func isExecutableFile(atPath path: String) -> Bool {
return _isExecutableFile(atPath: path)
}
/**
- parameters:
- path: The path to the file we are trying to determine is deletable.
- returns: `true` if the file is deletable, `false` otherwise.
*/
open func isDeletableFile(atPath path: String) -> Bool {
return _isDeletableFile(atPath: path)
}
internal func _compareDirectories(atPath path1: String, andPath path2: String) -> Bool {
guard let enumerator1 = enumerator(atPath: path1) else {
return false
}
guard let enumerator2 = enumerator(atPath: path2) else {
return false
}
var path1entries = Set<String>()
while let item = enumerator1.nextObject() as? String {
path1entries.insert(item)
}
while let item = enumerator2.nextObject() as? String {
if path1entries.remove(item) == nil {
return false
}
if contentsEqual(atPath: NSString(string: path1).appendingPathComponent(item), andPath: NSString(string: path2).appendingPathComponent(item)) == false {
return false
}
}
return path1entries.isEmpty
}
internal func _filePermissionsMask(mode : UInt32) -> Int {
#if os(Windows)
return Int(mode & ~UInt32(ucrt.S_IFMT))
#elseif canImport(Darwin)
return Int(mode & ~UInt32(S_IFMT))
#else
return Int(mode & ~S_IFMT)
#endif
}
internal func _permissionsOfItem(atPath path: String) throws -> Int {
let fileInfo = try _lstatFile(atPath: path)
return _filePermissionsMask(mode: UInt32(fileInfo.st_mode))
}
#if os(Linux)
// statx() is only supported by Linux kernels >= 4.11.0
internal lazy var supportsStatx: Bool = {
let requiredVersion = OperatingSystemVersion(majorVersion: 4, minorVersion: 11, patchVersion: 0)
return ProcessInfo.processInfo.isOperatingSystemAtLeast(requiredVersion)
}()
// renameat2() is only supported by Linux kernels >= 3.15
internal lazy var kernelSupportsRenameat2: Bool = {
let requiredVersion = OperatingSystemVersion(majorVersion: 3, minorVersion: 15, patchVersion: 0)
return ProcessInfo.processInfo.isOperatingSystemAtLeast(requiredVersion)
}()
#endif
/* -contentsEqualAtPath:andPath: does not take into account data stored in the resource fork or filesystem extended attributes.
*/
@available(Windows, deprecated, message: "Not Yet Implemented")
open func contentsEqual(atPath path1: String, andPath path2: String) -> Bool {
return _contentsEqual(atPath: path1, andPath: path2)
}
// For testing only: this facility pins the language used by displayName to the passed-in language.
private var _overriddenDisplayNameLanguages: [String]? = nil
internal func _overridingDisplayNameLanguages<T>(with languages: [String], within body: () throws -> T) rethrows -> T {
let old = _overriddenDisplayNameLanguages
defer { _overriddenDisplayNameLanguages = old }
_overriddenDisplayNameLanguages = languages
return try body()
}
private var _preferredLanguages: [String] {
return _overriddenDisplayNameLanguages ?? Locale.preferredLanguages
}
/* displayNameAtPath: returns an NSString suitable for presentation to the user. For directories which have localization information, this will return the appropriate localized string. This string is not suitable for passing to anything that must interact with the filesystem.
*/
open func displayName(atPath path: String) -> String {
let url = URL(fileURLWithPath: path)
let name = url.lastPathComponent
let nameWithoutExtension = url.deletingPathExtension().lastPathComponent
// https://developer.apple.com/library/archive/documentation/FileManagement/Conceptual/FileSystemAdvancedPT/LocalizingtheNameofaDirectory/LocalizingtheNameofaDirectory.html
// This localizes a X.localized directory:
if url.pathExtension == "localized" {
let dotLocalized = url.appendingPathComponent(".localized")
var isDirectory: ObjCBool = false
if fileExists(atPath: dotLocalized.path, isDirectory: &isDirectory),
isDirectory.boolValue {
for language in _preferredLanguages {
let stringsFile = dotLocalized.appendingPathComponent(language).appendingPathExtension("strings")
if let data = try? Data(contentsOf: stringsFile),
let plist = (try? PropertyListSerialization.propertyList(from: data, format: nil)) as? NSDictionary {
let localizedName = (plist[nameWithoutExtension] as? NSString)?._swiftObject
return localizedName ?? nameWithoutExtension
}
}
// If we get here and we don't have a good name for this, still hide the extension:
return nameWithoutExtension
}
}
// We do not have the bundle resources to map the names of system directories with .localized files on Darwin, and system directories do not exist on other platforms, so just skip that on swift-corelibs-foundation:
// URL resource values are not yet implemented: https://bugs.swift.org/browse/SR-10365
// return (try? url.resourceValues(forKeys: [.hasHiddenExtensionKey]))?.hasHiddenExtension == true ? nameWithoutExtension : name
return name
}
/* componentsToDisplayForPath: returns an NSArray of display names for the path provided. Localization will occur as in displayNameAtPath: above. This array cannot and should not be reassembled into an usable filesystem path for any kind of access.
*/
open func componentsToDisplay(forPath path: String) -> [String]? {
var url = URL(fileURLWithPath: path)
var count = url.pathComponents.count
var result: [String] = []
while count > 0 {
result.insert(displayName(atPath: url.path), at: 0)
url = url.deletingLastPathComponent()
count -= 1
}
return result
}
/* enumeratorAtPath: returns an NSDirectoryEnumerator rooted at the provided path. If the enumerator cannot be created, this returns NULL. Because NSDirectoryEnumerator is a subclass of NSEnumerator, the returned object can be used in the for...in construct.
*/
open func enumerator(atPath path: String) -> DirectoryEnumerator? {
return NSPathDirectoryEnumerator(path: path)
}
/* enumeratorAtURL:includingPropertiesForKeys:options:errorHandler: returns an NSDirectoryEnumerator rooted at the provided directory URL. The NSDirectoryEnumerator returns NSURLs from the -nextObject method. The optional 'includingPropertiesForKeys' parameter indicates which resource properties should be pre-fetched and cached with each enumerated URL. The optional 'errorHandler' block argument is invoked when an error occurs. Parameters to the block are the URL on which an error occurred and the error. When the error handler returns YES, enumeration continues if possible. Enumeration stops immediately when the error handler returns NO.
If you wish to only receive the URLs and no other attributes, then pass '0' for 'options' and an empty NSArray ('[NSArray array]') for 'keys'. If you wish to have the property caches of the vended URLs pre-populated with a default set of attributes, then pass '0' for 'options' and 'nil' for 'keys'.
*/
// Note: Because the error handler is an optional block, the compiler treats it as @escaping by default. If that behavior changes, the @escaping will need to be added back.
open func enumerator(at url: URL, includingPropertiesForKeys keys: [URLResourceKey]?, options mask: DirectoryEnumerationOptions = [], errorHandler handler: (/* @escaping */ (URL, Error) -> Bool)? = nil) -> DirectoryEnumerator? {
return NSURLDirectoryEnumerator(url: url, options: mask, errorHandler: handler)
}
/* subpathsAtPath: returns an NSArray of all contents and subpaths recursively from the provided path. This may be very expensive to compute for deep filesystem hierarchies, and should probably be avoided.
*/
open func subpaths(atPath path: String) -> [String]? {
return try? subpathsOfDirectory(atPath: path)
}
/* These methods are provided here for compatibility. The corresponding methods on NSData which return NSErrors should be regarded as the primary method of creating a file from an NSData or retrieving the contents of a file as an NSData.
*/
open func contents(atPath path: String) -> Data? {
return try? Data(contentsOf: URL(fileURLWithPath: path))
}
@discardableResult
open func createFile(atPath path: String, contents data: Data?, attributes attr: [FileAttributeKey : Any]? = nil) -> Bool {
do {
try (data ?? Data()).write(to: URL(fileURLWithPath: path), options: .atomic)
if let attr = attr {
try self.setAttributes(attr, ofItemAtPath: path)
}
return true
} catch {
return false
}
}
/* fileSystemRepresentationWithPath: returns an array of characters suitable for passing to lower-level POSIX style APIs. The string is provided in the representation most appropriate for the filesystem in question.
*/
open func fileSystemRepresentation(withPath path: String) -> UnsafePointer<Int8> {
precondition(path != "", "Empty path argument")
return try! __fileSystemRepresentation(withPath: path)
}
internal func __fileSystemRepresentation(withPath path: String) throws -> UnsafePointer<Int8> {
let len = CFStringGetMaximumSizeOfFileSystemRepresentation(path._cfObject)
if len != kCFNotFound {
let buf = UnsafeMutablePointer<Int8>.allocate(capacity: len)
buf.initialize(repeating: 0, count: len)
if path._nsObject.getFileSystemRepresentation(buf, maxLength: len) {
return UnsafePointer(buf)
}
buf.deinitialize(count: len)
buf.deallocate()
}
throw NSError(domain: NSCocoaErrorDomain, code: CocoaError.fileReadInvalidFileName.rawValue, userInfo: [NSFilePathErrorKey: path])
}
internal func _fileSystemRepresentation<ResultType>(withPath path: String, _ body: (UnsafePointer<Int8>) throws -> ResultType) throws -> ResultType {
let fsRep = try __fileSystemRepresentation(withPath: path)
defer { fsRep.deallocate() }
return try body(fsRep)
}
internal func _fileSystemRepresentation<ResultType>(withPath path1: String, andPath path2: String, _ body: (UnsafePointer<Int8>, UnsafePointer<Int8>) throws -> ResultType) throws -> ResultType {
let fsRep1 = try __fileSystemRepresentation(withPath: path1)
defer { fsRep1.deallocate() }
let fsRep2 = try __fileSystemRepresentation(withPath: path2)
defer { fsRep2.deallocate() }