wasmer_wasix/runners/
wasi.rs

1//! WebC container support for running WASI modules
2
3use std::{path::PathBuf, sync::Arc};
4
5use anyhow::{Context, Error};
6use tracing::Instrument;
7use virtual_fs::{ArcBoxFile, FileSystem, TmpFileSystem, VirtualFile};
8use wasmer::{Engine, Module};
9use wasmer_types::ModuleHash;
10use webc::metadata::{Command, annotations::Wasi};
11
12use crate::{
13    Runtime, WasiEnvBuilder, WasiError, WasiRuntimeError,
14    bin_factory::BinaryPackage,
15    capabilities::Capabilities,
16    journal::{DynJournal, DynReadableJournal, SnapshotTrigger},
17    runners::{MappedDirectory, MountedDirectory, wasi_common::CommonWasiOptions},
18    runtime::task_manager::VirtualTaskManagerExt,
19};
20
21use super::wasi_common::{MAPPED_CURRENT_DIR_DEFAULT_PATH, MappedCommand};
22
23#[derive(Debug, Default, Clone)]
24pub struct WasiRunner {
25    wasi: CommonWasiOptions,
26    stdin: Option<ArcBoxFile>,
27    stdout: Option<ArcBoxFile>,
28    stderr: Option<ArcBoxFile>,
29}
30
31pub enum PackageOrHash<'a> {
32    Package(&'a BinaryPackage),
33    Hash(ModuleHash),
34}
35
36pub enum RuntimeOrEngine {
37    Runtime(Arc<dyn Runtime + Send + Sync>),
38    Engine(Engine),
39}
40
41impl WasiRunner {
42    /// Constructs a new `WasiRunner`.
43    pub fn new() -> Self {
44        WasiRunner::default()
45    }
46
47    /// Returns the current entry function for this `WasiRunner`
48    pub fn entry_function(&self) -> Option<String> {
49        self.wasi.entry_function.clone()
50    }
51
52    /// Builder method to set the name of the entry function for this `WasiRunner`
53    pub fn with_entry_function<S>(&mut self, entry_function: S) -> &mut Self
54    where
55        S: Into<String>,
56    {
57        self.wasi.entry_function = Some(entry_function.into());
58        self
59    }
60
61    /// Returns the current arguments for this `WasiRunner`
62    pub fn get_args(&self) -> Vec<String> {
63        self.wasi.args.clone()
64    }
65
66    /// Builder method to provide CLI args to the runner
67    pub fn with_args<A, S>(&mut self, args: A) -> &mut Self
68    where
69        A: IntoIterator<Item = S>,
70        S: Into<String>,
71    {
72        self.wasi.args = args.into_iter().map(|s| s.into()).collect();
73        self
74    }
75
76    /// Builder method to provide environment variables to the runner.
77    pub fn with_env(mut self, key: impl Into<String>, value: impl Into<String>) -> Self {
78        self.wasi.env.insert(key.into(), value.into());
79        self
80    }
81
82    pub fn with_envs<I, K, V>(&mut self, envs: I) -> &mut Self
83    where
84        I: IntoIterator<Item = (K, V)>,
85        K: Into<String>,
86        V: Into<String>,
87    {
88        for (key, value) in envs {
89            self.wasi.env.insert(key.into(), value.into());
90        }
91        self
92    }
93
94    pub fn with_forward_host_env(&mut self, forward: bool) -> &mut Self {
95        self.wasi.forward_host_env = forward;
96        self
97    }
98
99    pub fn with_mapped_directories<I, D>(&mut self, dirs: I) -> &mut Self
100    where
101        I: IntoIterator<Item = D>,
102        D: Into<MappedDirectory>,
103    {
104        self.with_mounted_directories(dirs.into_iter().map(Into::into).map(MountedDirectory::from))
105    }
106
107    pub fn with_home_mapped(&mut self, is_home_mapped: bool) -> &mut Self {
108        self.wasi.is_home_mapped = is_home_mapped;
109        self
110    }
111
112    pub fn with_mounted_directories<I, D>(&mut self, dirs: I) -> &mut Self
113    where
114        I: IntoIterator<Item = D>,
115        D: Into<MountedDirectory>,
116    {
117        self.wasi.mounts.extend(dirs.into_iter().map(Into::into));
118        self
119    }
120
121    /// Mount a [`FileSystem`] instance at a particular location.
122    pub fn with_mount(&mut self, dest: String, fs: Arc<dyn FileSystem + Send + Sync>) -> &mut Self {
123        self.wasi.mounts.push(MountedDirectory { guest: dest, fs });
124        self
125    }
126
127    /// Override the directory the WASIX instance will start in.
128    pub fn with_current_dir(&mut self, dir: impl Into<PathBuf>) -> &mut Self {
129        self.wasi.current_dir = Some(dir.into());
130        self
131    }
132
133    /// Add a package that should be available to the instance at runtime.
134    pub fn with_injected_package(&mut self, pkg: BinaryPackage) -> &mut Self {
135        self.wasi.injected_packages.push(pkg);
136        self
137    }
138
139    /// Add packages that should be available to the instance at runtime.
140    pub fn with_injected_packages(
141        &mut self,
142        packages: impl IntoIterator<Item = BinaryPackage>,
143    ) -> &mut Self {
144        self.wasi.injected_packages.extend(packages);
145        self
146    }
147
148    pub fn with_mapped_host_command(
149        &mut self,
150        alias: impl Into<String>,
151        target: impl Into<String>,
152    ) -> &mut Self {
153        self.wasi.mapped_host_commands.push(MappedCommand {
154            alias: alias.into(),
155            target: target.into(),
156        });
157        self
158    }
159
160    pub fn with_mapped_host_commands(
161        &mut self,
162        commands: impl IntoIterator<Item = MappedCommand>,
163    ) -> &mut Self {
164        self.wasi.mapped_host_commands.extend(commands);
165        self
166    }
167
168    pub fn capabilities_mut(&mut self) -> &mut Capabilities {
169        &mut self.wasi.capabilities
170    }
171
172    pub fn with_capabilities(&mut self, capabilities: Capabilities) -> &mut Self {
173        self.wasi.capabilities = capabilities;
174        self
175    }
176
177    #[cfg(feature = "journal")]
178    pub fn with_snapshot_trigger(&mut self, on: SnapshotTrigger) -> &mut Self {
179        self.wasi.snapshot_on.push(on);
180        self
181    }
182
183    #[cfg(feature = "journal")]
184    pub fn with_default_snapshot_triggers(&mut self) -> &mut Self {
185        for on in crate::journal::DEFAULT_SNAPSHOT_TRIGGERS {
186            if !self.has_snapshot_trigger(on) {
187                self.with_snapshot_trigger(on);
188            }
189        }
190        self
191    }
192
193    #[cfg(feature = "journal")]
194    pub fn has_snapshot_trigger(&self, on: SnapshotTrigger) -> bool {
195        self.wasi.snapshot_on.contains(&on)
196    }
197
198    #[cfg(feature = "journal")]
199    pub fn with_snapshot_interval(&mut self, period: std::time::Duration) -> &mut Self {
200        if !self.has_snapshot_trigger(SnapshotTrigger::PeriodicInterval) {
201            self.with_snapshot_trigger(SnapshotTrigger::PeriodicInterval);
202        }
203        self.wasi.snapshot_interval.replace(period);
204        self
205    }
206
207    #[cfg(feature = "journal")]
208    pub fn with_stop_running_after_snapshot(&mut self, stop_running: bool) -> &mut Self {
209        self.wasi.stop_running_after_snapshot = stop_running;
210        self
211    }
212
213    #[cfg(feature = "journal")]
214    pub fn with_read_only_journal(&mut self, journal: Arc<DynReadableJournal>) -> &mut Self {
215        self.wasi.read_only_journals.push(journal);
216        self
217    }
218
219    #[cfg(feature = "journal")]
220    pub fn with_writable_journal(&mut self, journal: Arc<DynJournal>) -> &mut Self {
221        self.wasi.writable_journals.push(journal);
222        self
223    }
224
225    pub fn with_skip_stdio_during_bootstrap(&mut self, skip: bool) -> &mut Self {
226        self.wasi.skip_stdio_during_bootstrap = skip;
227        self
228    }
229
230    pub fn with_stdin(&mut self, stdin: Box<dyn VirtualFile + Send + Sync>) -> &mut Self {
231        self.stdin = Some(ArcBoxFile::new(stdin));
232        self
233    }
234
235    pub fn with_stdout(&mut self, stdout: Box<dyn VirtualFile + Send + Sync>) -> &mut Self {
236        self.stdout = Some(ArcBoxFile::new(stdout));
237        self
238    }
239
240    pub fn with_stderr(&mut self, stderr: Box<dyn VirtualFile + Send + Sync>) -> &mut Self {
241        self.stderr = Some(ArcBoxFile::new(stderr));
242        self
243    }
244
245    fn ensure_tokio_runtime() -> Option<tokio::runtime::Runtime> {
246        #[cfg(feature = "sys-thread")]
247        {
248            if tokio::runtime::Handle::try_current().is_ok() {
249                return None;
250            }
251
252            let rt = tokio::runtime::Builder::new_multi_thread()
253                .enable_all()
254                .build()
255                .expect(
256                    "Failed to build a multi-threaded tokio runtime. This is necessary \
257                for WASIX to work. You can provide a tokio runtime by building one \
258                yourself and entering it before using WasiRunner.",
259                );
260            Some(rt)
261        }
262
263        #[cfg(not(feature = "sys-thread"))]
264        {
265            None
266        }
267    }
268
269    #[tracing::instrument(level = "debug", skip_all)]
270    pub fn prepare_webc_env(
271        &self,
272        program_name: &str,
273        wasi: &Wasi,
274        pkg_or_hash: PackageOrHash,
275        runtime_or_engine: RuntimeOrEngine,
276        root_fs: Option<TmpFileSystem>,
277    ) -> Result<WasiEnvBuilder, anyhow::Error> {
278        let mut builder = WasiEnvBuilder::new(program_name);
279
280        match runtime_or_engine {
281            RuntimeOrEngine::Runtime(runtime) => {
282                builder.set_runtime(runtime);
283            }
284            RuntimeOrEngine::Engine(engine) => {
285                builder.set_engine(engine);
286            }
287        }
288
289        let container_fs = match pkg_or_hash {
290            PackageOrHash::Package(pkg) => {
291                builder.add_webc(pkg.clone());
292                builder.set_module_hash(pkg.hash());
293                builder.include_packages(pkg.package_ids.clone());
294                Some(Arc::clone(&pkg.webc_fs))
295            }
296            PackageOrHash::Hash(hash) => {
297                builder.set_module_hash(hash);
298                None
299            }
300        };
301
302        if self.wasi.is_home_mapped {
303            builder.set_current_dir(MAPPED_CURRENT_DIR_DEFAULT_PATH);
304        }
305
306        if let Some(current_dir) = &self.wasi.current_dir {
307            builder.set_current_dir(current_dir.clone());
308        }
309
310        if let Some(cwd) = &wasi.cwd {
311            builder.set_current_dir(cwd);
312        }
313
314        self.wasi
315            .prepare_webc_env(&mut builder, container_fs, wasi, root_fs)?;
316
317        if let Some(stdin) = &self.stdin {
318            builder.set_stdin(Box::new(stdin.clone()));
319        }
320        if let Some(stdout) = &self.stdout {
321            builder.set_stdout(Box::new(stdout.clone()));
322        }
323        if let Some(stderr) = &self.stderr {
324            builder.set_stderr(Box::new(stderr.clone()));
325        }
326
327        Ok(builder)
328    }
329
330    pub fn run_wasm(
331        &self,
332        runtime_or_engine: RuntimeOrEngine,
333        program_name: &str,
334        module: Module,
335        module_hash: ModuleHash,
336    ) -> Result<(), Error> {
337        // Just keep the runtime and enter guard alive until we're done running the module
338        let tokio_runtime = Self::ensure_tokio_runtime();
339        let _guard = tokio_runtime.as_ref().map(|rt| rt.enter());
340
341        let wasi = webc::metadata::annotations::Wasi::new(program_name);
342
343        let mut builder = self.prepare_webc_env(
344            program_name,
345            &wasi,
346            PackageOrHash::Hash(module_hash),
347            runtime_or_engine,
348            None,
349        )?;
350
351        #[cfg(feature = "ctrlc")]
352        {
353            builder = builder.attach_ctrl_c();
354        }
355
356        #[cfg(feature = "journal")]
357        {
358            for journal in self.wasi.read_only_journals.iter().cloned() {
359                builder.add_read_only_journal(journal);
360            }
361            for journal in self.wasi.writable_journals.iter().cloned() {
362                builder.add_writable_journal(journal);
363            }
364
365            if !self.wasi.snapshot_on.is_empty() {
366                for trigger in self.wasi.snapshot_on.iter().cloned() {
367                    builder.add_snapshot_trigger(trigger);
368                }
369            } else if !self.wasi.writable_journals.is_empty() {
370                for on in crate::journal::DEFAULT_SNAPSHOT_TRIGGERS {
371                    builder.add_snapshot_trigger(on);
372                }
373            }
374
375            if let Some(period) = self.wasi.snapshot_interval {
376                if self.wasi.writable_journals.is_empty() {
377                    return Err(anyhow::format_err!(
378                        "If you specify a snapshot interval then you must also specify a writable journal file"
379                    ));
380                }
381                builder.with_snapshot_interval(period);
382            }
383
384            builder.with_stop_running_after_snapshot(self.wasi.stop_running_after_snapshot);
385            builder.with_skip_stdio_during_bootstrap(self.wasi.skip_stdio_during_bootstrap);
386        }
387
388        let env = builder.build()?;
389        let runtime = env.runtime.clone();
390        let tasks = runtime.task_manager().clone();
391
392        let mut task_handle =
393            crate::bin_factory::spawn_exec_module(module, env, &runtime).context("Spawn failed")?;
394
395        #[cfg(feature = "ctrlc")]
396        task_handle.install_ctrlc_handler();
397        let task_handle = async move { task_handle.wait_finished().await }.in_current_span();
398
399        let result = tasks.spawn_and_block_on(task_handle)?;
400        let exit_code = result
401            .map_err(|err| {
402                // We do our best to recover the error
403                let msg = err.to_string();
404                let weak = Arc::downgrade(&err);
405                Arc::into_inner(err).unwrap_or_else(|| {
406                    weak.upgrade()
407                        .map(|err| wasi_runtime_error_to_owned(&err))
408                        .unwrap_or_else(|| {
409                            WasiRuntimeError::Anyhow(Arc::new(anyhow::format_err!("{msg}")))
410                        })
411                })
412            })
413            .context("Unable to wait for the process to exit")?;
414
415        if exit_code.raw() == 0 {
416            Ok(())
417        } else {
418            Err(WasiRuntimeError::Wasi(crate::WasiError::Exit(exit_code)).into())
419        }
420    }
421
422    pub fn run_command(
423        &mut self,
424        command_name: &str,
425        pkg: &BinaryPackage,
426        runtime_or_engine: RuntimeOrEngine,
427    ) -> Result<(), Error> {
428        // Just keep the runtime and enter guard alive until we're done running the module
429        let tokio_runtime = Self::ensure_tokio_runtime();
430        let _guard = tokio_runtime.as_ref().map(|rt| rt.enter());
431
432        let cmd = pkg
433            .get_command(command_name)
434            .with_context(|| format!("The package doesn't contain a \"{command_name}\" command"))?;
435        let wasi = cmd
436            .metadata()
437            .annotation("wasi")?
438            .unwrap_or_else(|| Wasi::new(command_name));
439
440        let exec_name = if let Some(exec_name) = wasi.exec_name.as_ref() {
441            exec_name
442        } else {
443            command_name
444        };
445
446        #[allow(unused_mut)]
447        let mut builder = self
448            .prepare_webc_env(
449                exec_name,
450                &wasi,
451                PackageOrHash::Package(pkg),
452                runtime_or_engine,
453                None,
454            )
455            .context("Unable to prepare the WASI environment")?;
456
457        #[cfg(feature = "journal")]
458        {
459            for journal in self.wasi.read_only_journals.iter().cloned() {
460                builder.add_read_only_journal(journal);
461            }
462            for journal in self.wasi.writable_journals.iter().cloned() {
463                builder.add_writable_journal(journal);
464            }
465
466            if !self.wasi.snapshot_on.is_empty() {
467                for trigger in self.wasi.snapshot_on.iter().cloned() {
468                    builder.add_snapshot_trigger(trigger);
469                }
470            } else if !self.wasi.writable_journals.is_empty() {
471                for on in crate::journal::DEFAULT_SNAPSHOT_TRIGGERS {
472                    builder.add_snapshot_trigger(on);
473                }
474            }
475
476            if let Some(period) = self.wasi.snapshot_interval {
477                if self.wasi.writable_journals.is_empty() {
478                    return Err(anyhow::format_err!(
479                        "If you specify a snapshot interval then you must also specify a journal file"
480                    ));
481                }
482                builder.with_snapshot_interval(period);
483            }
484
485            builder.with_stop_running_after_snapshot(self.wasi.stop_running_after_snapshot);
486        }
487
488        let env = builder.build()?;
489        let runtime = env.runtime.clone();
490        let command_name = command_name.to_string();
491        let tasks = runtime.task_manager().clone();
492        let pkg = pkg.clone();
493
494        // Wrapping the call to `spawn_and_block_on` in a call to `spawn_await` could help to prevent deadlocks
495        // because then blocking in here won't block the tokio runtime
496        //
497        // See run_wasm above for a possible fix
498        let exit_code = tasks.spawn_and_block_on(
499            async move {
500                let mut task_handle =
501                    crate::bin_factory::spawn_exec(pkg, &command_name, env, &runtime)
502                        .await
503                        .context("Spawn failed")?;
504
505                #[cfg(feature = "ctrlc")]
506                task_handle.install_ctrlc_handler();
507
508                task_handle
509                    .wait_finished()
510                    .await
511                    .map_err(|err| {
512                        // We do our best to recover the error
513                        let msg = err.to_string();
514                        let weak = Arc::downgrade(&err);
515                        Arc::into_inner(err).unwrap_or_else(|| {
516                            weak.upgrade()
517                                .map(|err| wasi_runtime_error_to_owned(&err))
518                                .unwrap_or_else(|| {
519                                    WasiRuntimeError::Anyhow(Arc::new(anyhow::format_err!("{msg}")))
520                                })
521                        })
522                    })
523                    .context("Unable to wait for the process to exit")
524            }
525            .in_current_span(),
526        )??;
527
528        if exit_code.raw() == 0 {
529            Ok(())
530        } else {
531            Err(WasiRuntimeError::Wasi(crate::WasiError::Exit(exit_code)).into())
532        }
533    }
534}
535
536impl crate::runners::Runner for WasiRunner {
537    fn can_run_command(command: &Command) -> Result<bool, Error> {
538        Ok(command
539            .runner
540            .starts_with(webc::metadata::annotations::WASI_RUNNER_URI))
541    }
542
543    #[tracing::instrument(skip_all)]
544    fn run_command(
545        &mut self,
546        command_name: &str,
547        pkg: &BinaryPackage,
548        runtime: Arc<dyn Runtime + Send + Sync>,
549    ) -> Result<(), Error> {
550        self.run_command(command_name, pkg, RuntimeOrEngine::Runtime(runtime))
551    }
552}
553
554fn wasi_runtime_error_to_owned(err: &WasiRuntimeError) -> WasiRuntimeError {
555    match err {
556        WasiRuntimeError::Init(a) => WasiRuntimeError::Init(a.clone()),
557        WasiRuntimeError::Export(a) => WasiRuntimeError::Export(a.clone()),
558        WasiRuntimeError::Instantiation(a) => WasiRuntimeError::Instantiation(a.clone()),
559        WasiRuntimeError::Wasi(WasiError::Exit(a)) => WasiRuntimeError::Wasi(WasiError::Exit(*a)),
560        WasiRuntimeError::Wasi(WasiError::ThreadExit) => {
561            WasiRuntimeError::Wasi(WasiError::ThreadExit)
562        }
563        WasiRuntimeError::Wasi(WasiError::UnknownWasiVersion) => {
564            WasiRuntimeError::Wasi(WasiError::UnknownWasiVersion)
565        }
566        WasiRuntimeError::Wasi(WasiError::DeepSleep(_)) => {
567            WasiRuntimeError::Anyhow(Arc::new(anyhow::format_err!("deep-sleep")))
568        }
569        WasiRuntimeError::Wasi(WasiError::DlSymbolResolutionFailed(symbol)) => {
570            WasiRuntimeError::Wasi(WasiError::DlSymbolResolutionFailed(symbol.clone()))
571        }
572        WasiRuntimeError::ControlPlane(a) => WasiRuntimeError::ControlPlane(a.clone()),
573        WasiRuntimeError::Runtime(a) => WasiRuntimeError::Runtime(a.clone()),
574        WasiRuntimeError::Thread(a) => WasiRuntimeError::Thread(a.clone()),
575        WasiRuntimeError::Anyhow(a) => WasiRuntimeError::Anyhow(a.clone()),
576    }
577}
578
579#[cfg(test)]
580mod tests {
581    use super::*;
582
583    #[test]
584    fn send_and_sync() {
585        fn assert_send<T: Send>() {}
586        fn assert_sync<T: Sync>() {}
587
588        assert_send::<WasiRunner>();
589        assert_sync::<WasiRunner>();
590    }
591
592    #[cfg(all(feature = "host-fs", feature = "sys"))]
593    #[tokio::test]
594    async fn test_volume_mount_without_webcs() {
595        use std::sync::Arc;
596
597        let root_fs = virtual_fs::RootFileSystemBuilder::new().build();
598
599        let tokrt = tokio::runtime::Handle::current();
600
601        let hostdir = virtual_fs::host_fs::FileSystem::new(tokrt.clone(), "/").unwrap();
602        let hostdir_dyn: Arc<dyn virtual_fs::FileSystem + Send + Sync> = Arc::new(hostdir);
603
604        root_fs
605            .mount("/host".into(), &hostdir_dyn, "/".into())
606            .unwrap();
607
608        let envb = crate::runners::wasi::WasiRunner::new();
609
610        let annotations = webc::metadata::annotations::Wasi::new("test");
611
612        let tm = Arc::new(crate::runtime::task_manager::tokio::TokioTaskManager::new(
613            tokrt.clone(),
614        ));
615        let rt = crate::PluggableRuntime::new(tm);
616
617        let envb = envb
618            .prepare_webc_env(
619                "test",
620                &annotations,
621                PackageOrHash::Hash(ModuleHash::random()),
622                RuntimeOrEngine::Runtime(Arc::new(rt)),
623                Some(root_fs),
624            )
625            .unwrap();
626
627        let init = envb.build_init().unwrap();
628
629        let fs = &init.state.fs.root_fs;
630
631        fs.read_dir(std::path::Path::new("/host")).unwrap();
632    }
633
634    #[cfg(all(feature = "host-fs", feature = "sys"))]
635    #[tokio::test]
636    async fn test_volume_mount_with_webcs() {
637        use std::sync::Arc;
638
639        use wasmer_package::utils::from_bytes;
640
641        let root_fs = virtual_fs::RootFileSystemBuilder::new().build();
642
643        let tokrt = tokio::runtime::Handle::current();
644
645        let hostdir = virtual_fs::host_fs::FileSystem::new(tokrt.clone(), "/").unwrap();
646        let hostdir_dyn: Arc<dyn virtual_fs::FileSystem + Send + Sync> = Arc::new(hostdir);
647
648        root_fs
649            .mount("/host".into(), &hostdir_dyn, "/".into())
650            .unwrap();
651
652        let envb = crate::runners::wasi::WasiRunner::new();
653
654        let annotations = webc::metadata::annotations::Wasi::new("test");
655
656        let tm = Arc::new(crate::runtime::task_manager::tokio::TokioTaskManager::new(
657            tokrt.clone(),
658        ));
659        let mut rt = crate::PluggableRuntime::new(tm);
660        rt.set_package_loader(crate::runtime::package_loader::BuiltinPackageLoader::new());
661
662        let webc_path = std::path::PathBuf::from(std::env::var("CARGO_MANIFEST_DIR").unwrap()).join("../../tests/integration/cli/tests/webc/wasmer-tests--volume-static-webserver@0.1.0.webc");
663        let webc_data = std::fs::read(webc_path).unwrap();
664        let container = from_bytes(webc_data).unwrap();
665
666        let binpkg = crate::bin_factory::BinaryPackage::from_webc(&container, &rt)
667            .await
668            .unwrap();
669
670        let mut envb = envb
671            .prepare_webc_env(
672                "test",
673                &annotations,
674                PackageOrHash::Package(&binpkg),
675                RuntimeOrEngine::Runtime(Arc::new(rt)),
676                Some(root_fs),
677            )
678            .unwrap();
679
680        envb = envb.preopen_dir("/host").unwrap();
681
682        let init = envb.build_init().unwrap();
683
684        let fs = &init.state.fs.root_fs;
685
686        fs.read_dir(std::path::Path::new("/host")).unwrap();
687        fs.read_dir(std::path::Path::new("/settings")).unwrap();
688    }
689}
wasmer_wasix/runners/wasi.rs

wasmer_wasix/runners/
wasi.rs
