Expose the platform value to the shim

Signed-off-by: James Sturtevant <[email protected]>

crates/containerd-shim-wasm/src/container/context.rs

@@ -1,5 +1,6 @@
 use std::path::{Path, PathBuf};
 
+use oci_spec::image::Platform;
 use oci_spec::runtime::Spec;
 
 use crate::sandbox::oci::WasmLayer;
@@ -24,6 +25,8 @@ pub trait RuntimeContext {
     fn wasi_entrypoint(&self) -> WasiEntrypoint;
 
     fn wasm_layers(&self) -> &[WasmLayer];
+
+    fn platform(&self) -> &Platform;
 }
 
 pub struct WasiEntrypoint {
@@ -34,6 +37,7 @@ pub struct WasiEntrypoint {
 pub(crate) struct WasiContext<'a> {
     pub spec: &'a Spec,
     pub wasm_layers: &'a [WasmLayer],
+    pub platform: &'a Platform,
 }
 
 impl RuntimeContext for WasiContext<'_> {
@@ -62,6 +66,10 @@ impl RuntimeContext for WasiContext<'_> {
     fn wasm_layers(&self) -> &[WasmLayer] {
         self.wasm_layers
     }
+
+    fn platform(&self) -> &Platform {
+        self.platform
+    }
 }
 
 #[cfg(test)]
@@ -86,6 +94,7 @@ mod tests {
         let ctx = WasiContext {
             spec: &spec,
             wasm_layers: &[],
+            platform: &Platform::default(),
         };
 
         let args = ctx.args();
@@ -105,6 +114,7 @@ mod tests {
         let ctx = WasiContext {
             spec: &spec,
             wasm_layers: &[],
+            platform: &Platform::default(),
         };
 
         let args = ctx.args();
@@ -132,6 +142,7 @@ mod tests {
         let ctx = WasiContext {
             spec: &spec,
             wasm_layers: &[],
+            platform: &Platform::default(),
         };
 
         let args = ctx.args();
@@ -153,6 +164,7 @@ mod tests {
         let ctx = WasiContext {
             spec: &spec,
             wasm_layers: &[],
+            platform: &Platform::default(),
         };
 
         let path = ctx.wasi_entrypoint().path;
@@ -180,6 +192,7 @@ mod tests {
         let ctx = WasiContext {
             spec: &spec,
             wasm_layers: &[],
+            platform: &Platform::default(),
         };
 
         let WasiEntrypoint { path, func } = ctx.wasi_entrypoint();
@@ -208,6 +221,7 @@ mod tests {
         let ctx = WasiContext {
             spec: &spec,
             wasm_layers: &[],
+            platform: &Platform::default(),
         };
 
         let WasiEntrypoint { path, func } = ctx.wasi_entrypoint();

crates/containerd-shim-wasm/src/sandbox/containerd.rs

@@ -10,7 +10,7 @@ use containerd_client::services::v1::{GetContainerRequest, GetImageRequest, Read
 use containerd_client::tonic::transport::Channel;
 use containerd_client::{tonic, with_namespace};
 use futures::TryStreamExt;
-use oci_spec::image::{Arch, ImageManifest, ImageConfiguration, MediaType};
+use oci_spec::image::{Arch, ImageManifest, MediaType, Platform};
 use tokio::runtime::Runtime;
 use tonic::Request;
 
@@ -116,7 +116,10 @@ impl Client {
     // load module will query the containerd store to find an image that has an OS of type 'wasm'
     // If found it continues to parse the manifest and return the layers that contains the WASM modules
     // and possibly other configuration layers.
-    pub fn load_modules(&self, containerd_id: impl ToString) -> Result<Vec<oci::WasmLayer>> {
+    pub fn load_modules(
+        &self,
+        containerd_id: impl ToString,
+    ) -> Result<(Vec<oci::WasmLayer>, Platform)> {
         let image_name = self.get_image(containerd_id.to_string())?;
         let digest = self.get_image_content_sha(image_name)?;
         let manifest = self.read_content(digest)?;
@@ -126,20 +129,20 @@ impl Client {
         let image_config_descriptor = manifest.config();
         let image_config = self.read_content(image_config_descriptor.digest())?;
         let image_config = image_config.as_slice();
-        let image_config = ImageConfiguration::from_reader(image_config)?;
 
-        let arch = image_config.architecture();
-        match arch {
+        // the only part we care about here is the platform values
+        let platform: Platform = serde_json::from_slice(image_config)?;
+        match platform.architecture() {
             Arch::Wasm => {
                 log::info!("found manifest with WASM OCI image format.");
             }
             _ => {
                 log::info!("manifest is not in WASM OCI image format");
-                return Ok([].to_vec());
+                return Ok(([].to_vec(), platform));
             }
         }
 
-        manifest
+        let layers = manifest
             .layers()
             .iter()
             .filter(|x| !is_image_layer_type(x.media_type()))
@@ -149,19 +152,25 @@ impl Client {
                     layer: module,
                 })
             })
-            .collect::<Result<Vec<_>>>()
+            .collect::<Result<Vec<_>>>()?;
+        Ok((layers, platform))
     }
 }
 
-fn is_image_layer_type(media_type: &MediaType)-> bool {
+fn is_image_layer_type(media_type: &MediaType) -> bool {
     match media_type {
-        MediaType::ImageLayer | 
-        MediaType::ImageLayerGzip | 
-        MediaType::ImageLayerNonDistributable | 
-        MediaType::ImageLayerNonDistributableGzip |
-        MediaType::ImageLayerNonDistributableZstd |
-        MediaType::ImageLayerZstd => true,
-        MediaType::Other(s) if s.as_str().starts_with("application/vnd.docker.image.rootfs.") => true,
-        _ => false
+        MediaType::ImageLayer
+        | MediaType::ImageLayerGzip
+        | MediaType::ImageLayerNonDistributable
+        | MediaType::ImageLayerNonDistributableGzip
+        | MediaType::ImageLayerNonDistributableZstd
+        | MediaType::ImageLayerZstd => true,
+        MediaType::Other(s)
+            if s.as_str()
+                .starts_with("application/vnd.docker.image.rootfs.") =>
+        {
+            true
+        }
+        _ => false,
     }
 }

crates/containerd-shim-wasm/src/sys/unix/container/executor.rs

@@ -10,6 +10,7 @@ use libcontainer::workload::{
     Executor as LibcontainerExecutor, ExecutorError as LibcontainerExecutorError,
     ExecutorValidationError,
 };
+use oci_spec::image::Platform;
 use oci_spec::runtime::Spec;
 
 use crate::container::{Engine, PathResolve, RuntimeContext, Stdio, WasiContext};
@@ -28,6 +29,7 @@ pub(crate) struct Executor<E: Engine> {
     stdio: Stdio,
     inner: OnceCell<InnerExecutor>,
     wasm_layers: Vec<WasmLayer>,
+    platform: Platform,
 }
 
 impl<E: Engine> LibcontainerExecutor for Executor<E> {
@@ -64,18 +66,24 @@ impl<E: Engine> LibcontainerExecutor for Executor<E> {
 }
 
 impl<E: Engine> Executor<E> {
-    pub fn new(engine: E, stdio: Stdio, wasm_layers: Vec<WasmLayer>) -> Self {
+    pub fn new(engine: E, stdio: Stdio, wasm_layers: Vec<WasmLayer>, platform: Platform) -> Self {
         Self {
             engine,
             stdio,
             inner: Default::default(),
             wasm_layers,
+            platform,
         }
     }
 
     fn ctx<'a>(&'a self, spec: &'a Spec) -> WasiContext<'a> {
         let wasm_layers = &self.wasm_layers;
-        WasiContext { spec, wasm_layers }
+        let platform = &self.platform;
+        WasiContext {
+            spec,
+            wasm_layers,
+            platform,
+        }
     }
 
     fn inner(&self, spec: &Spec) -> &InnerExecutor {

crates/containerd-shim-wasm/src/sys/unix/container/instance.rs

@@ -12,6 +12,7 @@ use libcontainer::syscall::syscall::SyscallType;
 use nix::errno::Errno;
 use nix::sys::wait::{waitid, Id as WaitID, WaitPidFlag, WaitStatus};
 use nix::unistd::Pid;
+use oci_spec::image::Platform;
 
 use crate::container::Engine;
 use crate::sandbox::instance_utils::{determine_rootdir, get_instance_root, instance_exists};
@@ -43,15 +44,15 @@ impl<E: Engine> SandboxInstance for Instance<E> {
         let stdio = Stdio::init_from_cfg(cfg)?;
 
         // check if container is OCI image with wasm layers and attempt to read the module
-        let modules = containerd::Client::connect(cfg.get_containerd_address(), &namespace)?
+        let (modules, platform) = containerd::Client::connect(cfg.get_containerd_address(), &namespace)?
             .load_modules(&id)
             .unwrap_or_else(|e| {
                 log::warn!("Error obtaining wasm layers for container {id}.  Will attempt to use files inside container image. Error: {e}");
-                vec![]
+                (vec![], Platform::default())
             });
 
         ContainerBuilder::new(id.clone(), SyscallType::Linux)
-            .with_executor(Executor::new(engine, stdio, modules))
+            .with_executor(Executor::new(engine, stdio, modules, platform))
             .with_root_path(rootdir.clone())?
             .as_init(&bundle)
             .with_systemd(false)