shasum for Windows

A very basic implementation of shasum for Windows (less than 50 lines of Rust code).

It doesn't hash directories themselves, and doesn't support any of shasum's fancier features (e.g. it only does sha1 hashing).

The output of shasum-windows.exe foo is equivalent to find foo -type f -exec shasum {} + (i.e. calling shasum on all files in the directory), except for:

• Directory junctions and symlinks are not traversed.
• If an error reading a file is encountered, Error:<debug explanation of error> is printed instead of a file's hash.

shasum-windows will also replace all backslashes in its output with forward slashes to make it easier to verify that the output is identical to that of shasum.

Installation & usage

1. Install Rust from http://rustup.rs/
2. Run cargo install --git https://github.com/caspark/shasum-windows.git
3. Run shasum-windows directory-of-your-choice

Example usage

c:\src\shasum-windows>shasum-windows.exe c:\temp\test\
22dedae30d54d528cdf8e81151ad26e86cd19bbb  c:/temp/test/counts-2018-10.xml
5cb92d6ba8270bd649db00ebb12873055be345f8  c:/temp/test/counts-2019-01.xml
a0d3eb93719724c76b3d43740a103eac52887dc1  c:/temp/test/subdir/counts-2018-11.xml
1ac2e5d72e99d7e237a9af2a7117a44ed1262643  c:/temp/test/subdir/counts-2018-12.xml

Known issues

• Files whose paths are longer than 260 characters will fail to be read unless you have enabled long paths support in Windows (e.g. via the Enable Win32 long paths group policy setting).
  • If long paths support is enabled then shasum-windows will opt into supporting long paths via its application manifest (see build.rs) and this won't be a problem.
  • See also rust-lang/rfcs#2188 for native long path support in Rust.

See also

• https://github.com/idrassi/DirHash - a fancier implementation, but crashes when it encounters a directory junction.