Add --guestfwd arg to boco boot

src/qemu.rs

@@ -24,6 +24,10 @@ pub struct BootCmd {
     #[clap(long)]
     forward: Vec<PortForward>,
 
+    /// Pass a `guestfwd=...` argument to qemu `-nic` argument.
+    #[clap(long)]
+    guestfwd: Vec<String>,
+
     /// Override the command to exec in the VM (base64-encoded on the kernel
     /// cmdline as `boco.cmd=<b64>`). Overrides the CMD inferred at build time.
     #[clap(long)]
@@ -35,6 +39,9 @@ pub struct BootCmd {
     /// relative to the image's WORKINGDIR. Can be repeated.
     #[clap(long)]
     mount: Vec<String>,
+
+    /// Extra arguments to qemu
+    extra: Vec<String>,
 }
 
 /// Invoke `qemu` to boot a boco image. See [`BootCmd`] for options
@@ -46,8 +53,10 @@ pub(crate) fn boot(
         name,
         memory,
         forward,
+        guestfwd,
         cmd,
         mount,
+        extra,
     }: BootCmd,
 ) -> Result<()> {
     let reg_dir = registry_dir(&name)?;
@@ -149,6 +158,9 @@ pub(crate) fn boot(
     for forward in &forward {
         _ = write!(&mut network, ",hostfwd={forward}");
     }
+    for guestfwd in &guestfwd {
+        _ = write!(&mut network, ",guestfwd={guestfwd}");
+    }
 
     let mut command = Command::new("qemu-system-x86_64");
 
@@ -165,7 +177,8 @@ pub(crate) fn boot(
         .args(["-no-reboot"])
         .args(["-append", &cmdline])
         .args(["-nographic"])
-        .args(["-nic", &network]);
+        .args(["-nic", &network])
+        .args(&extra);
 
     println!("{command:?}");