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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2023 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)
import Darwin
#elseif os(Android)
import Android
import unistd
#elseif canImport(Glibc)
import Glibc
#elseif canImport(Musl)
import Musl
#elseif os(Windows)
import CRT
import WinSDK
internal import _FoundationCShims
#elseif os(WASI)
import WASILibc
#endif
extension _FileManagerImpl {
func createSymbolicLink(
at url: URL,
withDestinationURL destURL: URL
) throws {
guard url.isFileURL else {
throw CocoaError.errorWithFilePath(.fileReadUnsupportedScheme, url)
}
// If there's no scheme, then this is probably a relative URL.
if destURL.scheme != nil && !destURL.isFileURL {
throw CocoaError.errorWithFilePath(.fileWriteUnsupportedScheme, destURL)
}
let path = url.path
let destPath = destURL.path
guard !path.isEmpty else {
throw CocoaError.errorWithFilePath(.fileNoSuchFile, url)
}
guard !destPath.isEmpty else {
throw CocoaError.errorWithFilePath(.fileNoSuchFile, destURL)
}
try fileManager.createSymbolicLink(atPath: path, withDestinationPath: destPath)
}
func createSymbolicLink(
atPath path: String,
withDestinationPath destPath: String
) throws {
#if os(Windows)
var bIsDirectory = false
let absoluteDestPath = URL(filePath: destPath, relativeTo: URL(filePath: path, directoryHint: .notDirectory)).path
_ = fileManager.fileExists(atPath: absoluteDestPath, isDirectory: &bIsDirectory)
try path.withNTPathRepresentation { lpSymlinkFileName in
try destPath.withFileSystemRepresentation {
try String(cString: $0!).withCString(encodedAs: UTF16.self) { lpTargetFileName in
if CreateSymbolicLinkW(lpSymlinkFileName, lpTargetFileName, SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE | (bIsDirectory ? SYMBOLIC_LINK_FLAG_DIRECTORY : 0)) == 0 {
throw CocoaError.errorWithFilePath(path, win32: GetLastError(), reading: false)
}
}
}
}
#else
try fileManager.withFileSystemRepresentation(for: path) { srcRep in
guard let srcRep else {
throw CocoaError.errorWithFilePath(.fileReadUnknown, path)
}
try fileManager.withFileSystemRepresentation(for: destPath) { destRep in
guard let destRep else {
throw CocoaError.errorWithFilePath(.fileReadUnknown, destPath)
}
if symlink(destRep, srcRep) != 0 {
throw CocoaError.errorWithFilePath(path, errno: errno, reading: false)
}
}
}
#endif
}
func linkItem(
at srcURL: URL,
to dstURL: URL
) throws {
guard srcURL.isFileURL else {
throw CocoaError.errorWithFilePath(.fileReadUnsupportedScheme, srcURL)
}
guard dstURL.isFileURL else {
throw CocoaError.errorWithFilePath(.fileWriteUnsupportedScheme, dstURL)
}
let srcPath = srcURL.path
let dstPath = dstURL.path
guard !srcPath.isEmpty else {
throw CocoaError.errorWithFilePath(.fileNoSuchFile, srcURL)
}
guard !dstPath.isEmpty else {
throw CocoaError.errorWithFilePath(.fileNoSuchFile, dstURL)
}
try fileManager.linkItem(atPath: srcPath, toPath: dstPath)
}
func linkItem(
atPath srcPath: String,
toPath dstPath: String
) throws {
try _FileOperations.linkFile(srcPath, to: dstPath, with: fileManager)
}
func destinationOfSymbolicLink(atPath path: String) throws -> String {
#if os(Windows)
return try path.withNTPathRepresentation {
var faAttributes: WIN32_FILE_ATTRIBUTE_DATA = .init()
guard GetFileAttributesExW($0, GetFileExInfoStandard, &faAttributes) else {
throw CocoaError.errorWithFilePath(path, win32: GetLastError(), reading: true)
}
guard faAttributes.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT == FILE_ATTRIBUTE_REPARSE_POINT else {
throw CocoaError.errorWithFilePath(path, win32: ERROR_BAD_ARGUMENTS, reading: true)
}
let hFile: HANDLE = CreateFileW($0, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, nil, OPEN_EXISTING, FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS, nil)
if hFile == INVALID_HANDLE_VALUE {
throw CocoaError.errorWithFilePath(path, win32: GetLastError(), reading: true)
}
defer { CloseHandle(hFile) }
return try withUnsafeTemporaryAllocation(of: UInt8.self, capacity: Int(MAXIMUM_REPARSE_DATA_BUFFER_SIZE)) { buffer in
guard let pBuffer = buffer.baseAddress else {
throw CocoaError.errorWithFilePath(path, win32: ERROR_INVALID_DATA, reading: false)
}
var dwBytesWritten: DWORD = 0
guard DeviceIoControl(hFile, FSCTL_GET_REPARSE_POINT, nil, 0, pBuffer, DWORD(buffer.count), &dwBytesWritten, nil) else {
throw CocoaError.errorWithFilePath(path, win32: GetLastError(), reading: true)
}
// Ensure that we have enough data.
guard dwBytesWritten >= MemoryLayout<REPARSE_DATA_BUFFER>.size else {
throw CocoaError.errorWithFilePath(path, win32: ERROR_INVALID_DATA, reading: false)
}
return try pBuffer.withMemoryRebound(to: REPARSE_DATA_BUFFER.self, capacity: 1) { pRDB in
let data: Data
switch pRDB.pointee.ReparseTag {
case CUnsignedLong(IO_REPARSE_TAG_SYMLINK):
let SubstituteNameOffset = pRDB.pointee.SymbolicLinkReparseBuffer.SubstituteNameOffset
let SubstituteNameLength = pRDB.pointee.SymbolicLinkReparseBuffer.SubstituteNameLength
guard SubstituteNameOffset + SubstituteNameLength <= dwBytesWritten else {
throw CocoaError.errorWithFilePath(path, win32: ERROR_INVALID_DATA, reading: false)
}
let pBuffer = UnsafeRawPointer(pRDB).advanced(by: _ioshims_reparse_data_buffer_symboliclinkreparsebuffer_pathbuffer_offset()).assumingMemoryBound(to: CChar.self)
data = Data(bytes: pBuffer.advanced(by: Int(SubstituteNameOffset)), count: Int(SubstituteNameLength))
break
case CUnsignedLong(IO_REPARSE_TAG_MOUNT_POINT):
let SubstituteNameOffset = pRDB.pointee.MountPointReparseBuffer.SubstituteNameOffset
let SubstituteNameLength = pRDB.pointee.MountPointReparseBuffer.SubstituteNameLength
guard SubstituteNameOffset + SubstituteNameLength <= dwBytesWritten else {
throw CocoaError.errorWithFilePath(path, win32: ERROR_INVALID_DATA, reading: false)
}
let pBuffer = UnsafeRawPointer(pRDB).advanced(by: _ioshims_reparse_data_buffer_mountpointreparsebuffer_pathbuffer_offset()).assumingMemoryBound(to: CChar.self)
data = Data(bytes: pBuffer.advanced(by: Int(SubstituteNameOffset)), count: Int(SubstituteNameLength))
break
default:
throw CocoaError.errorWithFilePath(path, win32: ERROR_BAD_ARGUMENTS, reading: true)
}
guard let destination: String = String(data: data, encoding: .utf16LittleEndian) else {
throw CocoaError.errorWithFilePath(path, win32: ERROR_INVALID_DATA, reading: false)
}
// Canonicalize the NT object manager path to the DOS style
// path. Unfortunately, there is no nice API which can allow us
// to do this in a guaranteed way.
if destination.hasPrefix("\\??\\") {
return String(destination.dropFirst(4))
}
return destination
}
}
}
#else
try fileManager.withFileSystemRepresentation(for: path) { rep in
guard let rep else {
throw CocoaError.errorWithFilePath(.fileReadUnknown, path)
}
return try withUnsafeTemporaryAllocation(of: CChar.self, capacity: FileManager.MAX_PATH_SIZE) { buffer in
let charsReturned = readlink(rep, buffer.baseAddress!, FileManager.MAX_PATH_SIZE)
guard charsReturned >= 0 else {
throw CocoaError.errorWithFilePath(path, errno: errno, reading: true)
}
return fileManager.string(withFileSystemRepresentation: buffer.baseAddress!, length: charsReturned)
}
}
#endif
}
}
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