chore(riklet): use firepilot binary autoload

docs/src/reference/riklet.md

@@ -0,0 +1,39 @@
+# Riklet
+
+[Rust in Kube (RIK)](https://github.com/dev-sys-do/rik) node agent
+
+## Faas Configuration
+
+**Prerequisite**: You need firecracker in your PATH.
+
+Here is a list of environment variables that can be used to configure run riklet:
+
+| Environment Variable   | Description                                                                                                             | Default |
+| ---------------------- | ----------------------------------------------------------------------------------------------------------------------- | ------- |
+| `IFACE`                | Network interface connected to the internet                                                                             | ""      |
+| `IFACE_IP`             | IP of the Network interface connected to the internet                                                                   | ""      |
+| `FIRECRACKER_LOCATION` | Path to the firecracker binary                                                                                          | ""      |
+| `KERNEL_LOCATION`      | Path to the kernel location                                                                                             | ""      |
+
+To run riklet with FAAS configuration.
+
+```bash
+sudo riklet --kernel-path ${KERNEL_LOCATION} \
+            --ifnet ${IFACE} \
+            --ifnet-ip ${IFACE_IP} \
+```
+
+> The firecracker binary location is determined by the following order:
+>
+> - **$FIRECRACKER_LOCATION** environment variable: direct path to the binary
+> - **$PATH** environment variable: search for the binary in the directories
+> - firecracker binary in the current working directory
+
+Exemple:
+
+```bash
+sudo riklet --kernel-path ./vmlinux.bin  \
+            --ifnet wlp2s0  \
+            --ifnet-ip 192.168.1.84  \
+            --script-path ./scripts/setup-host-tap.sh
+```

riklet/README.md

@@ -39,30 +39,37 @@ CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_RUNNER='sudo -E' cargo run --bin riklet
 
 ### Faas Usage
 
-**Prerequisite**: You need firecracker in yout PATH.
+**Prerequisite**: You need firecracker in your PATH.
 
-Here is a list of **required** environment variables to run riklet:
+Here is a list of environment variables that can be used to configure run riklet:
 
 | Environment Variable   | Description                                                                                                             | Default |
 | ---------------------- | ----------------------------------------------------------------------------------------------------------------------- | ------- |
 | `IFACE`                | Network interface connected to the internet                                                                             | ""      |
 | `IFACE_IP`             | IP of the Network interface connected to the internet                                                                   | ""      |
 | `FIRECRACKER_LOCATION` | Path to the firecracker binary                                                                                          | ""      |
 | `KERNEL_LOCATION`      | Path to the kernel location                                                                                             | ""      |
-| `SCRIPT_LOCATION`      | Path to the [script](https://github.com/polyxia-org/rik/blob/main/scripts/setup-host-tap.sh) that create tap interface. | ""      |
 
 To run riklet with FAAS configuration.
 
 ```bash
-sudo riklet --firecracker-path ${FIRECRACKER_LOCATION} \
-    --kernel-path ${KERNEL_LOCATION} --ifnet ${IFACE} \
-    --ifnet-ip ${IFACE_IP} --script-path ${SCRIPT_LOCATION}
+sudo riklet --kernel-path ${KERNEL_LOCATION} \
+            --ifnet ${IFACE} \
+            --ifnet-ip ${IFACE_IP} \
 ```
 
+> The firecracker binary location is determined by the following order:
+>
+> - **$FIRECRACKER_LOCATION** environment variable: direct path to the binary
+> - **$PATH** environment variable: search for the binary in the directories
+> - firecracker binary in the current working directory
+
 Exemple:
 
 ```bash
-sudo riklet --firecracker-path $(which firecracker) --kernel-path ./vmlinux.bin --ifnet wlp2s0 --ifnet-ip 192.168.1.84 --script-path ./scripts/setup-host-tap.sh
+sudo riklet --kernel-path ./vmlinux.bin  \
+            --ifnet wlp2s0  \
+            --ifnet-ip 192.168.1.84
 ```
 
 You should see something like that :
@@ -74,7 +81,7 @@ You should see something like that :
         |    /  | | |    \ | |    |  __|  | |
         | |\ \ _| |_| |\  \| |____| |___  | |
         \_| \_|\___/\_| \_/\_____/\____/  \_/
-        
+
 [2021-07-03T15:04:09Z INFO  riklet::core] Riklet (v0.1.0) is ready to accept connections.
 ```
 

riklet/src/cli/function_config.rs

@@ -5,14 +5,12 @@ use clap::Parser;
 
 #[derive(Debug, Clone)]
 pub struct FnConfiguration {
-    pub firecracker_location: PathBuf,
     pub kernel_location: PathBuf,
 }
 
 impl From<CliConfiguration> for FnConfiguration {
     fn from(cli: CliConfiguration) -> Self {
         FnConfiguration {
-            firecracker_location: cli.firecracker_path,
             kernel_location: cli.kernel_path,
         }
     }

riklet/src/cli/mod.rs

@@ -20,14 +20,6 @@ pub struct CliConfiguration {
     /// If set and there is a config file, values defined by the CLI will override values of the configuration file.
     #[arg(long)]
     pub override_config: bool,
-    /// Path to a firecracker binary on your system
-    #[arg(
-        long,
-        value_name = "FIRECRACKER_LOCATION",
-        env = "FIRECRACKER_LOCATION",
-        default_value = "firecracker"
-    )]
-    pub firecracker_path: PathBuf,
     /// Path to the linux kernel.
     #[arg(
         long,

riklet/src/runtime/function_runtime.rs

@@ -79,9 +79,10 @@ impl FunctionRuntime {
             )
             .try_build()
             .map_err(RuntimeError::FirepilotConfiguration)?;
-        let executor = FirecrackerExecutorBuilder::new()
+
+        let executor = FirecrackerExecutorBuilder::auto()
+            .map_err(RuntimeError::FirepilotConfiguration)?
             .with_chroot(DEFAULT_FIRECRACKER_WORKSPACE.to_string())
-            .with_exec_binary(self.function_config.firecracker_location.clone())
             .try_build()
             .map_err(RuntimeError::FirepilotConfiguration)?;