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