fix: VMs can be restarted

Previously, the temporary file for the cloud-init configuration ISO
was left attached to the VM. This meant the VM couldn't be turned off
and back on again: the temporary no longer existed.

Now we detach the ISO file after the VM has booted.

As a side effect, vmadm has gained start and shutdown subcommands, so
that the fix can be tested.

1 files changed, 15 insertions, 0 deletions

diff --git a/src/util.rs b/src/util.rs
new file mode 100644
index 0000000..9933f03
--- /dev/null
+++ b/src/util.rs
@@ -0,0 +1,15 @@
+//! Utilities.
+
+use std::net::TcpStream;
+
+const SSH_PORT: i32 = 22;
+
+// Wait for a virtual machine to have opened its SSH port.
+pub fn wait_for_ssh(name: &str) {
+    let addr = format!("{}:{}", name, SSH_PORT);
+    loop {
+        if TcpStream::connect(&addr).is_ok() {
+            return;
+        }
+    }
+}