sha1dir

Compute a checksum of a directory tree, for example to validate that a directory was copied successfully to a different machine.

Installation

$ 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