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Demonstrate preopen of tmpdir in linking example #131

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Demonstrate preopen of tmpdir in linking example #131

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34 changes: 19 additions & 15 deletions examples/linking.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,8 @@

from wasmtime import Engine, Store, Module, Linker, WasiConfig

import tempfile

engine = Engine()

# Load and compile our two modules
Expand All @@ -13,18 +15,20 @@
linker = Linker(engine)
linker.define_wasi()

# Create a `Store` to hold instances, and configure wasi state
store = Store(engine)
wasi = WasiConfig()
wasi.inherit_stdout()
store.set_wasi(wasi)

# Instantiate our first module which only uses WASI, then register that
# instance with the linker since the next linking will use it.
linking2 = linker.instantiate(store, linking2)
linker.define_instance(store, "linking2", linking2)

# And with that we can perform the final link and the execute the module.
linking1 = linker.instantiate(store, linking1)
run = linking1.exports(store)["run"]
run(store)
with tempfile.TemporaryDirectory() as tmpdirname:
# Create a `Store` to hold instances, and configure wasi state
store = Store(engine)
wasi = WasiConfig()
wasi.inherit_stdout()
wasi.preopen_dir(tmpdirname, tmpdirname)
store.set_wasi(wasi)

# Instantiate our first module which only uses WASI, then register that
# instance with the linker since the next linking will use it.
linking2 = linker.instantiate(store, linking2)
linker.define_instance(store, "linking2", linking2)

# And with that we can perform the final link and the execute the module.
linking1 = linker.instantiate(store, linking1)
run = linking1.exports(store)["run"]
run(store)