surma
9e9cde5241
Throwaway prototypes for Sausage v3. Plan and decisions: ~/research/sausage-v3/PLAN.md. Results and evidence: the spike READMEs.
3.8 KiB
Upstream Git WASI spike
Status: the agentOS baseline builds Git 2.55.0 for WASI. Diagnostic preload tests fail during startup.
The binary is /tmp/s3-git/agentos/toolchain/c/build/git (3,987,814 bytes).
See .board/T3.report.md for all 87 imports and the measured operation results.
Rework 1: unchanged agentOS baseline
baseline.nu invokes the pinned agentOS sysroot script through bash, then invokes its Git Makefile target.
The clone lives at /tmp/s3-git/agentos, commit 605f76de28366118c84e92ca6fd4938c1c501025.
The launcher expects /tmp/s3-git/tools/nproc to print 2 to limit compiler jobs.
Rework 2 added Python3 as an upstream build dependency. The unchanged build then succeeded.
nix shell nixpkgs#gnumake nixpkgs#cmake nixpkgs#ninja nixpkgs#gcc nixpkgs#patch nixpkgs#perl nixpkgs#python3 -c nu spikes/s3-git/baseline.nu
nix develop -c nu spikes/s3-git/stubs.nu /tmp/s3-git/agentos/toolchain/c/build/git /tmp/s3-git/stubs
mkdir -p /tmp/s3-git/dev
touch /tmp/s3-git/dev/null
nix develop -c nu spikes/s3-git/test.nu /tmp/s3-git/agentos/toolchain/c/build/git --stubs /tmp/s3-git/stubs
nix develop -c nu spikes/s3-git/probe.nu /tmp/s3-git/agentos/toolchain/c/build/git /tmp/s3-git/stubs
stubs.nu extracts imports and generates the five WAT preload modules.
The repository also contains those concrete WAT files.
test.nu fails at the first unsuccessful operation.
probe.nu records every operation independently. Native Git creates its fixtures.
All WASI probes fail at Git's startup open of /dev/null with the diagnostic stubs.
An exit code of zero from probe.nu means that it recorded results, not that Git passed.
Original stock-SDK attempt
The brief defines the intended local operations. test.nu exercises those operations through Wasmtime.
The script needs a successful build before it can verify behavior.
Reproduce the build failure
The experiment uses Git 2.49.0, zlib 1.3.1, and WASI SDK 34.0 for Linux ARM64.
Run these commands from the repository root. Keep the extracted sources under /tmp/s3-git.
mkdir -p /tmp/s3-git
curl -fL https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-34/wasi-sdk-34.0-arm64-linux.tar.gz -o /tmp/s3-git/sdk.tar.gz
tar -xf /tmp/s3-git/sdk.tar.gz -C /tmp/s3-git
curl -fL https://www.kernel.org/pub/software/scm/git/git-2.49.0.tar.xz -o /tmp/s3-git/git.tar.xz
tar -xf /tmp/s3-git/git.tar.xz -C /tmp/s3-git
curl -fL https://zlib.net/fossils/zlib-1.3.1.tar.gz -o /tmp/s3-git/zlib.tar.gz
tar -xf /tmp/s3-git/zlib.tar.gz -C /tmp/s3-git
nix build nixpkgs#ncurses --no-link
Set LD_LIBRARY_PATH to the SDK's lib directory and $(nix eval --raw nixpkgs#ncurses.outPath)/lib.
In /tmp/s3-git/zlib-1.3.1, run:
CC=/tmp/s3-git/wasi-sdk-34.0-arm64-linux/bin/clang AR=/tmp/s3-git/wasi-sdk-34.0-arm64-linux/bin/llvm-ar RANLIB=/tmp/s3-git/wasi-sdk-34.0-arm64-linux/bin/llvm-ranlib ./configure --static
nix shell nixpkgs#gnumake -c make -j2 libz.a
Apply 0001-wasi-no-syslog-header.patch with patch -p1 in the Git source directory.
From the repository root, run:
nix shell nixpkgs#gnumake -c nu spikes/s3-git/build.nu
This fails because the stock sysroot lacks sys/wait.h.
The patch only suppresses an unavailable header. It does not implement syslog or process support.
Required verification after a successful build
nix develop -c nu spikes/s3-git/test.nu /tmp/s3-git/git-2.49.0/git
Run the same script with the adapted component path after wasm-tools component new --adapt.
Neither execution passed in this spike.
Source checksums
f7e243dff54d60bcc576e94d6166b69f410f2500ae4a9ceef34315be10e77971 sdk.tar.gz
618190cf590b7e9f6c11f91f23b1d267cd98c3ab33b850416d8758f8b5a85628 git.tar.xz
9a93b2b7dfdac77ceba5a558a580e74667dd6fede4585b91eefb60f03b72df23 zlib.tar.gz