mirror of
https://github.com/superseriousbusiness/gotosocial.git
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1e7b32490d
This allows for building GoToSocial with [SQLite transpiled to WASM](https://github.com/ncruces/go-sqlite3) and accessed through [Wazero](https://wazero.io/).
117 lines
3.4 KiB
Go
117 lines
3.4 KiB
Go
package sysfs
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import (
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"io/fs"
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experimentalsys "github.com/tetratelabs/wazero/experimental/sys"
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)
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type ReadFS struct {
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experimentalsys.FS
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}
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// OpenFile implements the same method as documented on sys.FS
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func (r *ReadFS) OpenFile(path string, flag experimentalsys.Oflag, perm fs.FileMode) (experimentalsys.File, experimentalsys.Errno) {
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// Mask the mutually exclusive bits as they determine write mode.
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switch flag & (experimentalsys.O_RDONLY | experimentalsys.O_WRONLY | experimentalsys.O_RDWR) {
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case experimentalsys.O_WRONLY, experimentalsys.O_RDWR:
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// Return the correct error if a directory was opened for write.
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if flag&experimentalsys.O_DIRECTORY != 0 {
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return nil, experimentalsys.EISDIR
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}
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return nil, experimentalsys.ENOSYS
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default: // sys.O_RDONLY (integer zero) so we are ok!
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}
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f, errno := r.FS.OpenFile(path, flag, perm)
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if errno != 0 {
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return nil, errno
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}
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return &readFile{f}, 0
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}
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// Mkdir implements the same method as documented on sys.FS
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func (r *ReadFS) Mkdir(path string, perm fs.FileMode) experimentalsys.Errno {
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return experimentalsys.EROFS
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}
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// Chmod implements the same method as documented on sys.FS
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func (r *ReadFS) Chmod(path string, perm fs.FileMode) experimentalsys.Errno {
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return experimentalsys.EROFS
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}
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// Rename implements the same method as documented on sys.FS
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func (r *ReadFS) Rename(from, to string) experimentalsys.Errno {
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return experimentalsys.EROFS
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}
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// Rmdir implements the same method as documented on sys.FS
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func (r *ReadFS) Rmdir(path string) experimentalsys.Errno {
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return experimentalsys.EROFS
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}
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// Link implements the same method as documented on sys.FS
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func (r *ReadFS) Link(_, _ string) experimentalsys.Errno {
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return experimentalsys.EROFS
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}
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// Symlink implements the same method as documented on sys.FS
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func (r *ReadFS) Symlink(_, _ string) experimentalsys.Errno {
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return experimentalsys.EROFS
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}
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// Unlink implements the same method as documented on sys.FS
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func (r *ReadFS) Unlink(path string) experimentalsys.Errno {
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return experimentalsys.EROFS
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}
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// Utimens implements the same method as documented on sys.FS
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func (r *ReadFS) Utimens(path string, atim, mtim int64) experimentalsys.Errno {
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return experimentalsys.EROFS
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}
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// compile-time check to ensure readFile implements api.File.
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var _ experimentalsys.File = (*readFile)(nil)
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type readFile struct {
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experimentalsys.File
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}
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// Write implements the same method as documented on sys.File.
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func (r *readFile) Write([]byte) (int, experimentalsys.Errno) {
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return 0, r.writeErr()
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}
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// Pwrite implements the same method as documented on sys.File.
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func (r *readFile) Pwrite([]byte, int64) (n int, errno experimentalsys.Errno) {
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return 0, r.writeErr()
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}
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// Truncate implements the same method as documented on sys.File.
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func (r *readFile) Truncate(int64) experimentalsys.Errno {
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return r.writeErr()
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}
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// Sync implements the same method as documented on sys.File.
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func (r *readFile) Sync() experimentalsys.Errno {
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return experimentalsys.EBADF
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}
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// Datasync implements the same method as documented on sys.File.
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func (r *readFile) Datasync() experimentalsys.Errno {
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return experimentalsys.EBADF
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}
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// Utimens implements the same method as documented on sys.File.
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func (r *readFile) Utimens(int64, int64) experimentalsys.Errno {
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return experimentalsys.EBADF
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}
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func (r *readFile) writeErr() experimentalsys.Errno {
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if isDir, errno := r.IsDir(); errno != 0 {
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return errno
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} else if isDir {
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return experimentalsys.EISDIR
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}
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return experimentalsys.EBADF
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}
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