Artifact [ef0fd3de8a]

Artifact ef0fd3de8ae0bc005d762c88ce702d11b900115283fcd263828b6c8445f08a8a:

• File simio/storage.go — part of check-in [8cad365e82] at 2026-10-19 18:27:23 on branch feat/submanifest-reader — fix(checkout): write symlink entries as fossil does, so a fresh checkout extracts

  Since the scan began recording islink and chnged 7/9, Create followed by Extract without Force failed on any repository with an "l" file: the file was missing, the scan read it as UNLINK, and the missing-file skip only covered plain edits.

  Extract and Update now write a symlink entry as fossil's vfile_to_disk does: as a symlink to the blob content while allow-symlinks is on and the storage can make links, otherwise as a plain file holding the target. A symlink is deleted before a file is written over it, and setMergedMode leaves symlinks and directories alone, as file_setexe does. Extract's missing-file skip covers mode changes too, so the first Extract after Create plays fossil's open whatever the entry.

  With allow-symlinks off, fossil itself reports such a file UNLINK and its checkout refuses without --force; Extract keeps that behavior, and an interop test pins it against fossil's open in both modes.

  ScanENotFile no longer refuses a directory at a pending add or removal recorded with chnged=0, matching the else-if in vfile_check_signature.

  Tracked in #449 (user: [email protected], size: 2202) [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) }

// Symlink creates newname as a symbolic link to oldname. Like Lstat, it is
// not part of Storage.
func (OSStorage) Symlink(oldname, newname string) error { return os.Symlink(oldname, newname) }