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, 19 insertions, 0 deletions

diff --git a/src/cmd/shutdown.rs b/src/cmd/shutdown.rs
new file mode 100644
index 0000000..b53ebd3
--- /dev/null
+++ b/src/cmd/shutdown.rs
@@ -0,0 +1,19 @@
+//! The `shutdown` sub-command.
+
+use crate::libvirt::{Libvirt, VirtError};
+use crate::spec::Specification;
+use log::{debug, info};
+
+/// Shut down VMs corresponding to specifications.
+pub fn shutdown(specs: &[Specification]) -> Result<(), VirtError> {
+    let libvirt = Libvirt::connect("qemu:///system")?;
+    for spec in specs {
+        info!("shutting down virtual machine {}", spec.name);
+        libvirt.shutdown(&spec.name)?;
+    }
+    for spec in specs {
+        debug!("waiting for {} to become inactive", spec.name);
+        libvirt.wait_for_inactive(&spec.name)?;
+    }
+    Ok(())
+}