More ways to rename files.
The Rust standard library offers [std::fs::rename] for renaming files.
Sometimes, that's not enough. Consider the example of renaming a file but
aborting the operation if something already exists at the destination path.
That can be achieved using the Rust standard library but ensuring that the
operation is atomic requires platform-specific APIs. Without using
platform-specific APIs, a [TOCTTOU] bug can be introduced. This library aims
to provide a cross-platform interface to these APIs.
Renaming a file without the possibility of accidentally overwriting anything
can be done using [rename_exclusive]. It should be noted that this feature
is not supported by all combinations of operation system and file system.
rename_exclusive will fail if it can't be done atomically.
```rust use std::io::Result;
fn main() -> Result<()> { renamore::rename_exclusive("old.txt", "new.txt") } ```
Alternatively, [rename_exclusive_fallback] can be used. This will try to
perform the operation atomically, and use a non-atomic fallback if that's
not supported. The return value will indicate what happened.
```rust use std::io::Result;
fn main() -> Result<()> {
if renamore::renameexclusivefallback("old.txt", "new.txt")? {
// new.txt was definitely not overwritten.
println!("The operation was atomic");
} else {
// new.txt was probably not overwritten.
println!("The operation was not atomic");
}
Ok(())
} ```
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