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feat(wamr): add wasm-mico-runtime shim implementation #716

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@Mossaka Mossaka commented Nov 3, 2024

Follow up on the work done by #508 and #642. The runtime execution "thread signal env initialized failed" error was resolved by the upstream Wamr SDK and thus I used the latest sdk to re-build the wamr shim.

Now it actually worked!

sudo ctr run  --net-host --rm --runtime=io.containerd.wamr.v1 ghcr.io/containerd/runwasi/wasi-demo-app:latest testwasm /wasi-demo-app.wasm echo "hi"
hi
exiting

TODO

Maciej and others added 8 commits November 3, 2024 22:01
…error

upstream to the official wamr SDK solves this issue

Signed-off-by: jiaxiao zhou <[email protected]>
I believe there are more work to be done to parse the runtimeError
to appropriate exit code.

failures:
    wamr_tests::test_custom_entrypoint
    wamr_tests::test_exit_code
    wamr_tests::test_hello_world_oci
    wamr_tests::test_seccomp
    wamr_tests::test_unreachable

Signed-off-by: jiaxiao zhou <[email protected]>
Comment on lines 89 to 92
.or_else(|err| {
log::error!("Error: {:?}", err);
Err(err)
})
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we should parse the RuntimeError to appropriate exit code. Any thoughts on this one, @lum1n0us?

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Regarding that, I just noticed that WAMR only uses error strings to convey information if something goes wrong during the execution of a Wasm function. So, if it's okay, can we continue to display the error string in the log and use a simple -1 and 0 to indicate failure and success, respectively?

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@Mossaka Mossaka Nov 4, 2024

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For example, how can I get exit code 42 from running this wasm module?

(module
    ;; Import the required proc_exit WASI function which terminates the program with an exit code.
    ;; The function signature for proc_exit is:
    ;; (exit_code: i32) -> !
    (import "wasi_snapshot_preview1" "proc_exit" (func $proc_exit (param i32)))
    (memory 1)
    (export "memory" (memory 0))
    (func $main (export "_start")
        (call $proc_exit (i32.const 42))
        unreachable
    )
)

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We have a fix for this situation. Please have a look.

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Approved

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Merged

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Mossaka commented Nov 5, 2024

@lum1n0us do you know why the entrypoint_test failed?

thread 'wamr_tests::test_custom_entrypoint' panicked at crates/containerd-shim-wamr/src/tests.rs:58:5:
assertion `left == right` failed
  left: "hello world\n[00:08:01:896 - 7FA1CA910640]: warning: a module with WASI apis should be either a command or a reactor\n"
 right: "hello world\n"

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Mossaka commented Nov 5, 2024

@lum1n0us
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lum1n0us commented Nov 5, 2024

Yes, that's because WAMR enforces a strict application ABI check. Every wasm32-wasi .wasm should be classified as either a command or a reactor.

For your case,

  • either patch the case as a command, for example. Add a function like (func $start (export "_start"))
  • or WAMR turns off the WARNING messages by setting a higher log level.

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