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# go-erofs

A Go library for reading and creating [EROFS](https://erofs.docs.kernel.org/) filesystem images using the standard [fs.FS](https://pkg.go.dev/io/fs#FS) interface.

## Features

- **Read** EROFS images through Go's `fs.FS` interface
- **Create** EROFS images from directories or any `fs.FS`
- **Merge** multiple filesystem sources with overlay whiteout support
- **Metadata-only** mode for container layer indexing (chunk-based references to original data)
- Pure Go, no CGO — uses only the standard library

### Status

- [x] Read erofs files created with default `mkfs.erofs` options
- [x] Read chunk-based erofs files with indexes
- [x] Xattr support including long xattr prefixes
- [x] Extra devices for chunked data
- [x] Create erofs files from any `fs.FS`
- [x] Directory to erofs packing
- [x] AUFS whiteout to overlayfs conversion
- [x] Merge multiple filesystem layers with whiteout processing
- [ ] Read erofs files with compression

## Reading an EROFS image

```go
f, err := os.Open("image.erofs")
if err != nil {
    log.Fatal(err)
}
defer f.Close()

img, err := erofs.Open(f)
if err != nil {
    log.Fatal(err)
}

fs.WalkDir(img, ".", func(path string, d fs.DirEntry, err error) error {
    fmt.Println(path)
    return nil
})
```

## Merging multiple layers

Combine multiple filesystem sources into one image. The `Merge` option enables overlay semantics — AUFS-style whiteout files (`.wh.<name>`) delete entries from prior layers:

```go
outFile, _ := os.Create("merged.erofs")
w := erofs.Create(outFile)

w.CopyFrom(baseLayer)
w.CopyFrom(overlayLayer, erofs.Merge())
w.Close()
```

Merge can also be combined with `MetadataOnly` to build a merged index without copying data:

```go
w := erofs.Create(outFile)
w.CopyFrom(layer1, erofs.MetadataOnly())
w.CopyFrom(layer2, erofs.MetadataOnly(), erofs.Merge())
w.Close()
```

## Building an image programmatically

```go
outFile, _ := os.Create("image.erofs")
w := erofs.Create(outFile)

f, _ := w.Create("/hello.txt")
f.Write([]byte("hello world\n"))
f.Close()

w.Mkdir("/dir", 0o755)
w.Symlink("hello.txt", "/link")

w.Close()
outFile.Close()
```

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