Artifact [23669f7c5d]

Artifact 23669f7c5d3a8eaa5a9898e75380c0a986b8e2f870a03542cefabcbf27efe2a1:

• File simio/storage.go — part of check-in [2d2e62d420] at 2026-10-18 22:16:06 on branch feat/submanifest-reader — fix(checkout): scan missing files and mode changes as fossil does

  Port the remaining branches of fossil's vfile_check_signature. A missing file is marked changed with mtime -1, a removed file is marked changed, and the permission half sets chnged 6-9 for exec-bit and symlink changes (returning to 0 when undone), honouring the allow-symlinks setting: off, a symlink is seen as what it points to; on, as itself, its content its target's name.

  Status reports the mode changes as fossil's changes command labels them (executable, symlink, unexec, unlink). Commit records the permission it finds on disk, l included, with a symlink's target as its content. Where the storage has no file modes (MemStorage) or on Windows, the recorded permissions are kept, as fossil on Windows keeps them. ScanENotFile now refuses a non-file where a tracked file belongs, and merge scans with it as fossil's does. Extract still writes a missing file without Force.

  Interop tests run the same edits through fossil changes and go-libfossil status on one checkout, in both orders and with allow-symlinks on and off, and compare a commit's F cards with fossil's.

  Tracked in #449 (user: [email protected], size: 2005) [annotate] [blame] [check-ins using] [more...]

package simio

import (
	"io/fs"
	"os"
	"time"
)

// Storage abstracts filesystem operations for WASM portability.
type Storage interface {
	Stat(path string) (os.FileInfo, error)
	Remove(path string) error
	MkdirAll(path string, perm os.FileMode) error
	ReadFile(path string) ([]byte, error)
	WriteFile(path string, data []byte, perm os.FileMode) error
	ReadDir(path string) ([]fs.DirEntry, error)
	Chtimes(path string, atime, mtime time.Time) error
}

// OSStorage delegates to the os package. Used in production and WASI.
type OSStorage struct{}

func (OSStorage) Stat(path string) (os.FileInfo, error)                       { return os.Stat(path) }
func (OSStorage) Remove(path string) error                                     { return os.Remove(path) }
func (OSStorage) MkdirAll(path string, perm os.FileMode) error                { return os.MkdirAll(path, perm) }
func (OSStorage) ReadFile(path string) ([]byte, error)                         { return os.ReadFile(path) }
func (OSStorage) WriteFile(path string, data []byte, perm os.FileMode) error  { return os.WriteFile(path, data, perm) }
func (OSStorage) ReadDir(path string) ([]fs.DirEntry, error)                  { return os.ReadDir(path) }
func (OSStorage) Chtimes(path string, atime, mtime time.Time) error           { return os.Chtimes(path, atime, mtime) }

// Chmod changes a file's mode. It is not part of Storage, since not every
// storage has file modes; callers that need it check for it.
func (OSStorage) Chmod(path string, mode os.FileMode) error { return os.Chmod(path, mode) }

// Lstat is Stat without following a final symbolic link. It is not part of
// Storage, since not every storage has symbolic links or file modes;
// callers that need it check for it.
func (OSStorage) Lstat(path string) (os.FileInfo, error) { return os.Lstat(path) }

// Readlink returns the target a symbolic link names. Like Lstat, it is not
// part of Storage.
func (OSStorage) Readlink(path string) (string, error) { return os.Readlink(path) }