# `VFS.Skeleton`
[🔗](https://github.com/ivarvong/vfs/blob/v0.1.0/lib/vfs/skeleton.ex#L1)

Default implementations of the optional `VFS.Mountable` ops a backend
doesn't override.

`use VFS.Skeleton` inside a `defimpl` block to inherit:

  * `walk/3`        — composed via `VFS.Default.walk/3`. Override for
                      native pushdown (e.g. exgit walking tree objects
                      directly).
  * `materialize/2` — no-op; override for lazy backends.

Both are `defoverridable`, so backends shadow with native impls.

## Required minimum

The skeleton provides defaults for `walk/3` and `materialize/2`. The
backend must still implement: `stream_read/3`, `readdir/2`, `stat/2`,
`exists?/2`, `write_file/4`, `mkdir/3`, `rm/3`, `capabilities/1`.
Read-only backends typically refuse the mutations with
`{:error, VFS.Error.new(:erofs, ...)}`.

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*Consult [api-reference.md](api-reference.md) for complete listing*