cli: Add switch --apply

No reason not to have this.

Closes: #770
Signed-off-by: Colin Walters <walters@verbum.org>

lib/src/cli.rs

@@ -59,6 +59,14 @@ pub(crate) struct SwitchOpts {
  #[clap(long)]
  pub(crate) quiet: bool,
 
+ /// Restart or reboot into the new target image.
+ ///
+ /// Currently, this option always reboots. In the future this command
+ /// will detect the case where no kernel changes are queued, and perform
+ /// a userspace-only restart.
+ #[clap(long)]
+ pub(crate) apply: bool,
+
  /// The transport; e.g. oci, oci-archive, containers-storage. Defaults to `registry`.
  #[clap(long, default_value = "registry")]
  pub(crate) transport: String,
@@ -697,6 +705,10 @@ async fn switch(opts: SwitchOpts) -> Result<()> {
  let stateroot = booted_deployment.osname();
  crate::deploy::stage(sysroot, &stateroot, &fetched, &new_spec).await?;
 
+ if opts.apply {
+ crate::reboot::reboot()?;
+ }
+
  Ok(())
 }