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GH-144533: Use wasmtime's --argv0 to auto-discover sysconfig in WASI builds#145328

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savannahostrowski merged 3 commits intopython:mainfromsavannahostrowski:wasi-argv0
Feb 28, 2026
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Original file line numberDiff line numberDiff line change
@@ -0,0 +1 @@
Use wasmtime's ``--argv0`` to auto-discover sysconfig in WASI builds
19 changes: 3 additions & 16 deletionsPlatforms/WASI/__main__.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -317,21 +317,8 @@ def configure_wasi_python(context, working_dir):

wasi_build_dir = working_dir.relative_to(CHECKOUT)

python_build_dir = BUILD_DIR / "build"
lib_dirs = list(python_build_dir.glob("lib.*"))
assert len(lib_dirs) == 1, (
f"Expected a single lib.* directory in {python_build_dir}"
)
lib_dir = os.fsdecode(lib_dirs[0])
python_version = lib_dir.rpartition("-")[-1]
sysconfig_data_dir = (
f"{wasi_build_dir}/build/lib.wasi-wasm32-{python_version}"
)

# Use PYTHONPATH to include sysconfig data which must be anchored to the
# WASI guest's `/` directory.
args = {
"PYTHONPATH": f"/{sysconfig_data_dir}",
"ARGV0": f"/{wasi_build_dir}/python.wasm",
"PYTHON_WASM": working_dir / "python.wasm",
}
# Check dynamically for wasmtime in case it was specified manually via
Expand DownExpand Up@@ -421,8 +408,8 @@ def main():
default_host_triple = config["targets"]["host-triple"]
default_host_runner = (
f"{WASMTIME_HOST_RUNNER_VAR} run "
#For setting PYTHONPATH tothe sysconfig data directory.
"--env PYTHONPATH={PYTHONPATH} "
#Set argv0 so that getpath.py can auto-discoverthe sysconfig data directory
"--argv0 {ARGV0} "
# Map the checkout to / to load the stdlib from /Lib.
f"--dir {os.fsdecode(CHECKOUT)}::/ "
# Flags involving --optimize, --codegen, --debug, --wasm, and --wasi can be kept
Expand Down
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