feat(rollback): add --apply flag

Adds an --apply flag to the `bootc rollback` command to implement
automated restarts.

Have confirmed this works by building the bootc binary and running
`bootc rollback --apply` on my host.  This restarted the machine
into the new (rollback) image.

Closes #1029

Signed-off-by: Robert Sturla <[email protected]>

Author: p5

docs/src/man/bootc-rollback.md

@@ -7,7 +7,7 @@ queued upgrade) then it will be discarded
 
 # SYNOPSIS
 
-**bootc rollback** \[**-h**\|**\--help**\]
+**bootc rollback**  \[**\--apply**\] \[**-h**\|**\--help**\]
 
 # DESCRIPTION
 
@@ -28,6 +28,14 @@ rollback invocation.
 
 # OPTIONS
 
+**\--apply**
+
+:   Restart or reboot into the rollback 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.
+
 **-h**, **\--help**
 
 :   Print help (see a summary with -h)

lib/src/cli.rs

@@ -131,7 +131,15 @@ pub(crate) struct SwitchOpts {
 
 /// Options controlling rollback
 #[derive(Debug, Parser, PartialEq, Eq)]
-pub(crate) struct RollbackOpts {}
+pub(crate) struct RollbackOpts {
+    /// Restart or reboot into the rollback 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,
+}
 
 /// Perform an edit operation
 #[derive(Debug, Parser, PartialEq, Eq)]
@@ -905,9 +913,15 @@ async fn switch(opts: SwitchOpts) -> Result<()> {
 
 /// Implementation of the `bootc rollback` CLI command.
 #[context("Rollback")]
-async fn rollback(_opts: RollbackOpts) -> Result<()> {
+async fn rollback(opts: RollbackOpts) -> Result<()> {
     let sysroot = &get_storage().await?;
-    crate::deploy::rollback(sysroot).await
+    crate::deploy::rollback(sysroot).await?;
+
+    if opts.apply {
+        crate::reboot::reboot()?;
+    }
+
+    Ok(())
 }
 
 /// Implementation of the `bootc edit` CLI command.