# `Fil.ConflictError`
[🔗](https://github.com/pehbehbeh/fil/blob/v0.2.0/lib/fil/exceptions.ex#L130)

The file changed while the operation used it. Read it again and retry.

`Fil` returns it with `reason: :size_changed` for a write of a stream whose size `Fil` found (a `File.Stream` or a
stream from `Fil.stream/3`, see the `:size` option of `Fil.write/4`), and for a copy across disks, when the file
changed size while it was read. For a `File.Stream`, the error has the write's context. For a stream from
`Fil.stream/3`, it has the context of the file that changed: `op: :read` with the source's path and disk (`op: :cp`
or `:rename` in a copy across disks).

`Fil.Adapter.Local` and `Fil.Adapter.Memory` return it with `reason: :source_changed` for a move with
`if_exists: :error` whose source a write replaced while it was moved (`Fil.Adapter.S3` can't check that). S3 returns
it with `reason: "NoSuchUpload"` for an upload in parts that something else aborted while it ran, such as a lifecycle
rule. Retrying can help, as with `Fil.UnavailableError`, because the next attempt reads the file as it is then, or
starts a new upload.

# `t`

```elixir
@type t() :: %Fil.ConflictError{
  __exception__: term(),
  disk: Fil.Disk.t() | nil,
  op: Fil.Op.name() | nil,
  path: String.t() | nil,
  reason: term()
}
```