xz-wasm

Completely vibe coded script to build liblzma as a standalone WebAssembly module for WASI.

Upstream

• Upstream source is tracked as the git submodule at upstream/xz.
• The submodule is pinned to the upstream release in upstream.env.

Local build

git submodule update --init --checkout
./scripts/build-wasi.sh

Outputs land in dist/:

• dist/liblzma.a
• dist/liblzma.wasm
• dist/build-info.txt
• dist/SHA256SUMS

Reproducible Docker build

The Docker image installs Debian packages from a fixed snapshot timestamp. That keeps the toolchain stable across rebuilds.

git submodule update --init --checkout
./scripts/build-docker.sh

Useful overrides:

DEBIAN_SNAPSHOT=20260306T000000Z ./scripts/build-docker.sh
DEBIAN_RELEASE=bookworm ./scripts/build-docker.sh
OUT_DIR=$PWD/out ./scripts/build-wasi.sh
WASI_SYSROOT=/usr ./scripts/build-wasi.sh