fix: add support for macos in cert chain script

[Jesse Wright (jeswr)]

This gets the setup scripts working on a (my) macOS machine.

I have NOT tested this change on Linux and Windows - these changes should be tested on those environments before merging this PR.

[Copilot]

Pull Request Overview

This PR aims to enable macOS compatibility for the certificate chain generation script.

• Updated directory path computations to work across Linux, Windows, and macOS
• Changed how scriptsdir and outdir are determined using realpath

Comments suppressed due to low confidence (1)

circuit_setup/scripts/gen_x509_cert_chain.sh:17

• The updated scriptsdir is set to an absolute path despite the comment stating that relative paths are to be used. Please verify if the intention is to use absolute paths on macOS and update the comment accordingly, or adjust the command to compute a relative path.

scriptsdir=$(realpath "$current_dir")

[Christian Paquin (christianpaquin)]

Thanks Jesse Wright (@jeswr). Does the rest of the build works on macOS? Specifically the ./build_all.sh? What about the tests in /creds: cargo test --release?

[Jesse Wright (jeswr)]

I haven't tested those; and am going to be AFK for the next 3 days.

Can test when I return

[Moven T (moven0831)]

I ran into the same issue on my macbook, and thanks to Jesse Wright (@jeswr) for the elegant solution here.

I also ran ./build_all.sh, which went smoothly for all of the circuit setup. But for ./setup-sample.sh, the getrandom crate failed to compile:

crescent-credentials/creds/Cargo.toml

Lines 66 to 69 in c639608

	# Enable wasm build for getrandom
	[target.'cfg(target_arch = "wasm32")'.dependencies]
	getrandom_03 = { package = "getrandom", version = "0.3", features = ["wasm_js"] }
	getrandom_02 = { package = "getrandom", version = "0.2", features = ["js"] }

Also, to pass cargo test --release, the halo2curve's "asm" feature needs to be disabled since it only supports x86_64 targets:

crescent-credentials/ecdsa-pop/Cargo.toml

Lines 31 to 33 in c639608

	# Enable 'asm' feature when NOT a wasm build
	[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
	halo2curves = { version = "0.8.0", features = ["asm"] }

"

[Christian Paquin (christianpaquin)]

I also ran ./build_all.sh, which went smoothly for all of the circuit setup. But for ./setup-sample.sh, the getrandom crate failed to compile:

crescent-credentials/creds/Cargo.toml

Lines 66 to 69 in c639608

	# Enable wasm build for getrandom
	[target.'cfg(target_arch = "wasm32")'.dependencies]
	getrandom_03 = { package = "getrandom", version = "0.3", features = ["wasm_js"] }
	getrandom_02 = { package = "getrandom", version = "0.2", features = ["js"] }

Any recommended fix for the getrandom build failure?