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Strip \\?\ prefix from path generated by resolveSymlink #485

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merged 1 commit into from
Oct 11, 2024
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Strip \\?\ prefix from path generated by resolveSymlink #485

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16 changes: 11 additions & 5 deletions Sources/TSCBasic/PathShims.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -24,21 +24,27 @@ import Foundation
public func resolveSymlinks(_ path: AbsolutePath) throws -> AbsolutePath {
#if os(Windows)
let handle: HANDLE = path.pathString.withCString(encodedAs: UTF16.self) {
CreateFileW($0, GENERIC_READ, DWORD(FILE_SHARE_READ), nil,
CreateFileW($0, GENERIC_READ, DWORD(FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE), nil,
DWORD(OPEN_EXISTING), DWORD(FILE_FLAG_BACKUP_SEMANTICS), nil)
}
if handle == INVALID_HANDLE_VALUE { return path }
defer { CloseHandle(handle) }

let dwLength: DWORD =
GetFinalPathNameByHandleW(handle, nil, 0, DWORD(FILE_NAME_NORMALIZED))
GetFinalPathNameByHandleW(handle, nil, 0, DWORD(VOLUME_NAME_DOS))
return try withUnsafeTemporaryAllocation(of: WCHAR.self, capacity: Int(dwLength)) {
guard GetFinalPathNameByHandleW(handle, $0.baseAddress!, DWORD($0.count),
DWORD(FILE_NAME_NORMALIZED)) == dwLength - 1 else {
DWORD(VOLUME_NAME_DOS)) == dwLength - 1 else {
throw FileSystemError(.unknownOSError, path)
}
let path = String(decodingCString: $0.baseAddress!, as: UTF16.self)
return try AbsolutePath(path)
let pathBaseAddress: UnsafePointer<WCHAR>
if Array($0.prefix(4)) == Array(#"\\?\"#.utf16) {
// When using `VOLUME_NAME_DOS`, the returned path uses `\\?\`.
pathBaseAddress = UnsafePointer($0.baseAddress!.advanced(by: 4))
} else {
pathBaseAddress = UnsafePointer($0.baseAddress!)
}
return try AbsolutePath(String(decodingCString: pathBaseAddress, as: UTF16.self))
}
#else
let pathStr = path.pathString
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