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Minimal wasm implementation

This commit is contained in:
Furisto 2021-12-19 17:50:56 +01:00
parent de6385fdb2
commit d6e563078e
7 changed files with 1065 additions and 31 deletions
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@ -2,12 +2,32 @@
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checksum = "52144d4c78e5cf8b055ceab8e5fa22814ce4315d6002ad32cfd914f37c12fd65"
[[package]]
name = "wast"
version = "38.0.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ae0d7b256bef26c898fa7344a2d627e8499f5a749432ce0a05eae1a64ff0c271"
dependencies = [
"leb128",
]
[[package]]
name = "wat"
version = "1.0.40"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "adcfaeb27e2578d2c6271a45609f4a055e6d7ba3a12eff35b1fd5ba147bdf046"
dependencies = [
"wast",
]
[[package]]
name = "which"
version = "4.2.2"

2
crates/libcontainer/Cargo.toml
View File

@ -26,6 +26,8 @@ libcgroups = { version = "0.0.1", path = "../libcgroups" }
libseccomp = { version = "0.0.1", path = "../libseccomp" }
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"
wasmer = "2.1.0"
wasmer-wasi = "2.1.0"
[dev-dependencies]
oci-spec = { git = "https://github.com/containers/oci-spec-rs", rev = "12dcd858543db0e7bfb1ef053d1b748f2fda74ee", features = ["proptests"] }

1
crates/libcontainer/src/exec/default.rs Normal file
View File

@ -0,0 +1 @@

2
crates/libcontainer/src/exec/mod.rs Normal file
View File

@ -0,0 +1,2 @@
pub mod default;
pub mod wasmer;

69
crates/libcontainer/src/exec/wasmer.rs Normal file
View File

@ -0,0 +1,69 @@
use anyhow::{bail, Context, Result};
use oci_spec::runtime::Spec;
use wasmer::{Instance, Module, Store};
use wasmer_wasi::WasiState;
static EMPTY: Vec<String> = Vec::new();
pub fn exec(spec: &Spec) -> Result<()> {
let process = spec.process().as_ref();
let args = process
.and_then(|p| p.args().as_ref())
.unwrap_or_else(|| &EMPTY);
let env = process
.and_then(|p| p.env().as_ref())
.unwrap_or_else(|| &EMPTY)
.into_iter()
.filter_map(|e| {
e.split_once("=")
.filter(|kv| !kv.0.contains('\u{0}') && !kv.1.contains('\u{0}'))
.map(|kv| (kv.0.trim(), kv.1.trim()))
});
if args.len() == 0 {
bail!("at least one process arg must be specified")
}
if !args[0].ends_with(".wasm") {
bail!("first argument must be a wasm module, but was {}", args[0])
}
let mut wasm_env = WasiState::new("youki_wasm_app")
.args(args.iter().skip(1))
.envs(env)
.finalize()?;
let store = Store::default();
let module = Module::from_file(&store, "hello.wasm").context("could not load wasm module")?;
let imports = wasm_env
.import_object(&module)
.context("could not retrieve wasm imports")?;
let instance =
Instance::new(&module, &imports).context("wasm module could not be instantiated")?;
let start = instance
.exports
.get_function("_start")
.context("could not retrieve wasm module main function")?;
start
.call(&[])
.context("wasm module was not executed successfuly")?;
Ok(())
}
fn can_handle(spec: &Spec) -> Result<bool> {
if let Some(annotations) = spec.annotations() {
if let Some(handler) = annotations.get("run.oci.handler") {
return Ok(handler == "wasm");
}
if let Some(variant) = annotations.get("module.wasm.image/variant") {
return Ok(variant == "compat");
}
}
Ok(false)
}

1
crates/libcontainer/src/lib.rs
View File

@ -3,6 +3,7 @@ pub mod apparmor;
pub mod capabilities;
pub mod config;
pub mod container;
pub mod exec;
pub mod hooks;
pub mod namespaces;
pub mod notify_socket;

15
crates/libcontainer/src/process/container_init_process.rs
View File

@ -237,20 +237,20 @@ pub fn container_init_process(
// change the root of filesystem of the process to the rootfs
syscall
.pivot_rootfs(rootfs_path)
.with_context(|| format!("Failed to pivot root to {:?}", rootfs_path))?;
.with_context(|| format!("failed to pivot root to {:?}", rootfs_path))?;
} else {
syscall
.chroot(rootfs_path)
.with_context(|| format!("Failed to chroot to {:?}", rootfs_path))?;
.with_context(|| format!("failed to chroot to {:?}", rootfs_path))?;
}
rootfs
.adjust_root_mount_propagation(linux)
.context("Failed to set propagation type of root mount")?;
.context("failed to set propagation type of root mount")?;
if let Some(kernel_params) = linux.sysctl() {
sysctl(kernel_params)
.with_context(|| format!("Failed to sysctl: {:?}", kernel_params))?;
.with_context(|| format!("failed to sysctl: {:?}", kernel_params))?;
}
}
@ -273,7 +273,7 @@ pub fn container_init_process(
// mount readonly path
for path in paths {
readonly_path(Path::new(path), syscall)
.with_context(|| format!("Failed to set read only path {:?}", path))?;
.with_context(|| format!("failed to set read only path {:?}", path))?;
}
}
@ -281,7 +281,7 @@ pub fn container_init_process(
// mount masked path
for path in paths {
masked_path(Path::new(path), linux.mount_label(), syscall)
.with_context(|| format!("Failed to set masked path {:?}", path))?;
.with_context(|| format!("failed to set masked path {:?}", path))?;
}
}
@ -414,7 +414,8 @@ pub fn container_init_process(
}
if let Some(args) = proc.args() {
utils::do_exec(&args[0], args)?;
crate::exec::wasmer::exec(spec).context("failed to exec")?;
//utils::do_exec(&args[0], args)?;
} else {
bail!("on non-Windows, at least one process arg entry is required")
}