Add: bytesrw.0.3.0

[dbuenzli]

• Add: bytesrw.0.3.0 home, doc, issues
  Composable byte stream readers and writers for OCaml

---

bytesrw v0.3.0 2025-11-04 Zagreb

• Add the Bytesrw_sysrandom module for operating system provided
  cryptographically secure pseudorandom byte streams and an entropy
  primitive.

• Add the optional Bytesrw_crypto.Psa module for low-level
  cryptographic operations on byte slices. These are thin and safe
  bindings to the PSA Crypto API specification currently provided by
  the TF-PSA-Crypto C library distributed with Mbed TLS.

• Add the optional Bytesrw_crypto module for higher-level
  cryptographic operations implemented over Bytesrw_crypto.Psa.
  Mostly hashing for now. Use this if you need SHA-3 hashes.

• Add the optional Bytesrw_tls a module for TLS encrypted streams
  and the needed X.509 certificate management (including system
  lookups for trusted CAs). The backend is provided by the Mbed TLS C
  library.

• Add Bytesrw_unix.bytes_writer_of_socket_fd which shutdowns the
  fd in the send direction when the end of stream is written.

• Add Bytes.Slice.last.

• Review Int_val vs Long_val in C bindings. Affects
  Bytesrw_blake3, Bytesrw_md, Bytesrw_xxh, Bytesrw_zlib,
  Bytesrw_zstd

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Use b0 -- .opam publish bytesrw.0.3.0 to update the pull request.

[dbuenzli]

The windows cygwin failure is odd, I actually tested the package on my turtle vm and it succeeded. Let's wait on #28833 to be merged, I'll update the topkg constraint and we'll get a better error message.

For the rest we just have a problem with alpine that I need to investigate. It seems the getentropy C call is not defined. I guess it's a musl thing to look into.

[mseri]

I merged the other PR

[dbuenzli]

Aaah it's nice to see the actual errors in the opam error snippet :–) So many years and it took a cmd.exe limitation to improve topkg's error reporting.

So we have this:

'D:\opamroot\default\lib\ocamlbuild/ocamlbuild.cmx' -o myocamlbuild.exe
  # + ocamlfind ocamlc -config
  # + pkg-config --libs-only-l zlib > 'C:\Users\RUNNER~1\AppData\Local\Temp\pkgconfig3205e2pkg-config'
  # Can't open perl script "/cygdrive/c/Strawberry/perl/bin/pkg-config": No such file or directory
  # Command exited with code 2.

I'd say the error is weird but indeed the build system expects and runs pkg-config even if you don't configure any bytesrw depopt. Yet there is no dependency of the package towards conf-pkg-config. Let's try to add it.

[dbuenzli]

The error persists (but our dependencies are more correct). I posit however that this is not an error with bytesrw but with the install of conf-pkg-config on Windows cygwin ?

 # + ocamlfind ocamlc -config
  # + pkg-config --libs-only-l zlib > 'C:\Users\RUNNER~1\AppData\Local\Temp\pkgconfig2dfc08pkg-config'
  # Can't open perl script "/cygdrive/c/Strawberry/perl/bin/pkg-config": No such file or directory
  # Command exited with code 2.

So I'd suggest to merge this. Alpine has been constrained away, the alpine support will be restored with a bugfix release.

The vif revdep failure is because the package seems to be doing tests I suspect it should not perform on the opam CI /cc @dinosaure or @hannesm.

[dinosaure]

You can merge this PR regardless vif which is on beta.

[dbuenzli]

You can merge this PR regardless vif which is on beta.

That's not the point :–) I think you should disable these kind of tests for the opam repository. It's annoying both for repo maintainers and submitters to have to sift through these errors.

[mseri]

If vif test cannot run, we should indeed disable them here on the repository

[mseri]

Thanks both!

[dbuenzli]

Thanks @mseri. Any idea about what to do about this pkg-config issue on windows ?

[mseri]

Unfortunately not. I have zero experience on windows, and only access to windows in the ci here. I would wait for some windows user to help us out if they hit the issue :P

[dbuenzli]

I would wait for some windows user to help us out if they hit the issue :P

I'm not sure they will. I did not. I thought perhaps there is something wrong with the CI itself.