mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-21 09:42:11 +00:00
1e7b32490d
This allows for building GoToSocial with [SQLite transpiled to WASM](https://github.com/ncruces/go-sqlite3) and accessed through [Wazero](https://wazero.io/).
121 lines
3.6 KiB
Go
121 lines
3.6 KiB
Go
//go:build (amd64 || arm64) && windows
|
|
|
|
package sysfs
|
|
|
|
import (
|
|
"io/fs"
|
|
"syscall"
|
|
|
|
experimentalsys "github.com/tetratelabs/wazero/experimental/sys"
|
|
"github.com/tetratelabs/wazero/sys"
|
|
)
|
|
|
|
// dirNlinkIncludesDot is false because Windows does not return dot entries.
|
|
//
|
|
// Note: this is only used in tests
|
|
const dirNlinkIncludesDot = false
|
|
|
|
func lstat(path string) (sys.Stat_t, experimentalsys.Errno) {
|
|
attrs := uint32(syscall.FILE_FLAG_BACKUP_SEMANTICS)
|
|
// Use FILE_FLAG_OPEN_REPARSE_POINT, otherwise CreateFile will follow symlink.
|
|
// See https://docs.microsoft.com/en-us/windows/desktop/FileIO/symbolic-link-effects-on-file-systems-functions#createfile-and-createfiletransacted
|
|
attrs |= syscall.FILE_FLAG_OPEN_REPARSE_POINT
|
|
return statPath(attrs, path)
|
|
}
|
|
|
|
func stat(path string) (sys.Stat_t, experimentalsys.Errno) {
|
|
attrs := uint32(syscall.FILE_FLAG_BACKUP_SEMANTICS)
|
|
return statPath(attrs, path)
|
|
}
|
|
|
|
func statPath(createFileAttrs uint32, path string) (sys.Stat_t, experimentalsys.Errno) {
|
|
if len(path) == 0 {
|
|
return sys.Stat_t{}, experimentalsys.ENOENT
|
|
}
|
|
pathp, err := syscall.UTF16PtrFromString(path)
|
|
if err != nil {
|
|
return sys.Stat_t{}, experimentalsys.EINVAL
|
|
}
|
|
|
|
// open the file handle
|
|
h, err := syscall.CreateFile(pathp, 0, 0, nil,
|
|
syscall.OPEN_EXISTING, createFileAttrs, 0)
|
|
if err != nil {
|
|
errno := experimentalsys.UnwrapOSError(err)
|
|
// To match expectations of WASI, e.g. TinyGo TestStatBadDir, return
|
|
// ENOENT, not ENOTDIR.
|
|
if errno == experimentalsys.ENOTDIR {
|
|
errno = experimentalsys.ENOENT
|
|
}
|
|
return sys.Stat_t{}, errno
|
|
}
|
|
defer syscall.CloseHandle(h)
|
|
|
|
return statHandle(h)
|
|
}
|
|
|
|
// fdFile allows masking the `Fd` function on os.File.
|
|
type fdFile interface {
|
|
Fd() uintptr
|
|
}
|
|
|
|
func statFile(f fs.File) (sys.Stat_t, experimentalsys.Errno) {
|
|
if osF, ok := f.(fdFile); ok {
|
|
// Attempt to get the stat by handle, which works for normal files
|
|
st, err := statHandle(syscall.Handle(osF.Fd()))
|
|
|
|
// ERROR_INVALID_HANDLE happens before Go 1.20. Don't fail as we only
|
|
// use that approach to fill in inode data, which is not critical.
|
|
//
|
|
// Note: statHandle uses UnwrapOSError which coerces
|
|
// ERROR_INVALID_HANDLE to EBADF.
|
|
if err != experimentalsys.EBADF {
|
|
return st, err
|
|
}
|
|
}
|
|
return defaultStatFile(f)
|
|
}
|
|
|
|
func statHandle(h syscall.Handle) (sys.Stat_t, experimentalsys.Errno) {
|
|
winFt, err := syscall.GetFileType(h)
|
|
if err != nil {
|
|
return sys.Stat_t{}, experimentalsys.UnwrapOSError(err)
|
|
}
|
|
|
|
var fi syscall.ByHandleFileInformation
|
|
if err = syscall.GetFileInformationByHandle(h, &fi); err != nil {
|
|
return sys.Stat_t{}, experimentalsys.UnwrapOSError(err)
|
|
}
|
|
|
|
var m fs.FileMode
|
|
if fi.FileAttributes&syscall.FILE_ATTRIBUTE_READONLY != 0 {
|
|
m |= 0o444
|
|
} else {
|
|
m |= 0o666
|
|
}
|
|
|
|
switch { // check whether this is a symlink first
|
|
case fi.FileAttributes&syscall.FILE_ATTRIBUTE_REPARSE_POINT != 0:
|
|
m |= fs.ModeSymlink
|
|
case winFt == syscall.FILE_TYPE_PIPE:
|
|
m |= fs.ModeNamedPipe
|
|
case winFt == syscall.FILE_TYPE_CHAR:
|
|
m |= fs.ModeDevice | fs.ModeCharDevice
|
|
case fi.FileAttributes&syscall.FILE_ATTRIBUTE_DIRECTORY != 0:
|
|
m |= fs.ModeDir | 0o111 // e.g. 0o444 -> 0o555
|
|
}
|
|
|
|
st := sys.Stat_t{}
|
|
// FileIndex{High,Low} can be combined and used as a unique identifier like inode.
|
|
// https://learn.microsoft.com/en-us/windows/win32/api/fileapi/ns-fileapi-by_handle_file_information
|
|
st.Dev = uint64(fi.VolumeSerialNumber)
|
|
st.Ino = (uint64(fi.FileIndexHigh) << 32) | uint64(fi.FileIndexLow)
|
|
st.Mode = m
|
|
st.Nlink = uint64(fi.NumberOfLinks)
|
|
st.Size = int64(fi.FileSizeHigh)<<32 + int64(fi.FileSizeLow)
|
|
st.Atim = fi.LastAccessTime.Nanoseconds()
|
|
st.Mtim = fi.LastWriteTime.Nanoseconds()
|
|
st.Ctim = fi.CreationTime.Nanoseconds()
|
|
return st, 0
|
|
}
|