sha1dir ======= [

](https://github.com/dtolnay/sha1dir) [

](https://crates.io/crates/sha1dir) [

](https://github.com/dtolnay/sha1dir/actions?query=branch%3Amaster) Compute a checksum of a directory tree, for example to validate that a directory was copied successfully to a different machine. ## Installation ```console $ RUSTFLAGS='-C target-cpu=native' cargo install sha1dir ``` ## Usage Run `sha1dir` to checksum the current directory, or run `sha1dir path/to/dir1 path/to/dir2 ...` to checksum one or more other directories. ## Behavior The checksum is computed as the bitwise XOR of SHA-1 hashes one per directory entry. The hash for each directory entry is the hash of the following body: - For regular files — the one byte `'f'`, 4 little endian bytes for the path length, the bytes of the path, 4 little endian bytes for the Unix file mode as given by st\_mode, and finally the file contents. - For symbolic links — the one byte `'l'`, the path length / path / mode as for regular files, and then the path of the link target. - For directories — the one byte `'d'`, and the path length / path / mode. The resulting checksum is 160 bits wide like SHA-1.
#### License ^{Licensed under either of Apache License, Version
2.0 or MIT license at your option.}
_{Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
be dual licensed as above, without any additional terms or conditions.}