monitor: One-to-one relationship between guests and images

monitor.toml.example

@@ -52,6 +52,12 @@ base_image_max_age = 86400
 # Uncomment to skip cached Servo repo updates.
 # dont_update_cached_servo_repo = true
 
+# Create libvirt guests for profile templates as “ci-template-<profile_name>.0”. Namespace must not be used by anything else!
+# libvirt_template_guest_prefix = "ci-template"
+
+# Create libvirt guests for image rebuilds as “ci-rebuild-<profile_name>.0”. Namespace must not be used by anything else!
+# libvirt_rebuild_guest_prefix = "ci-rebuild"
+
 # Create libvirt guests for runners as “ci-runner-<profile_name>.0”. Namespace must not be used by anything else!
 # libvirt_runner_guest_prefix = "ci-runner"
 

monitor/settings/src/lib.rs

@@ -80,6 +80,8 @@ pub struct Toml {
     pub main_repo_path: String,
     base_image_max_age: u64,
     dont_update_cached_servo_repo: Option<bool>,
+    libvirt_template_guest_prefix: Option<String>,
+    libvirt_rebuild_guest_prefix: Option<String>,
     libvirt_runner_guest_prefix: Option<String>,
     pub available_1g_hugepages: usize,
     pub available_normal_memory: MemorySize,
@@ -242,6 +244,18 @@ impl Toml {
         self.queue_member.unwrap_or(false)
     }
 
+    pub fn libvirt_template_guest_prefix(&self) -> &str {
+        self.libvirt_template_guest_prefix
+            .as_deref()
+            .unwrap_or("ci-template")
+    }
+
+    pub fn libvirt_rebuild_guest_prefix(&self) -> &str {
+        self.libvirt_rebuild_guest_prefix
+            .as_deref()
+            .unwrap_or("ci-rebuild")
+    }
+
     pub fn libvirt_runner_guest_prefix(&self) -> &str {
         self.libvirt_runner_guest_prefix
             .as_deref()

monitor/settings/src/profile.rs

@@ -1,3 +1,4 @@
+use jane_eyre::eyre::{self, OptionExt};
 use serde::{Deserialize, Serialize};
 
 use crate::{TOML, units::MemorySize};
@@ -20,8 +21,24 @@ pub enum ImageType {
 }
 
 impl Profile {
-    pub fn profile_guest_name(&self) -> String {
-        format!("{}", self.profile_name)
+    pub fn snapshot_path_slug(&self, snapshot_name: &str) -> String {
+        format!("{}@{snapshot_name}", self.profile_name)
+    }
+
+    pub fn template_guest_name(&self, snapshot_name: &str) -> String {
+        format!(
+            "{}-{}@{snapshot_name}",
+            TOML.libvirt_template_guest_prefix(),
+            self.profile_name
+        )
+    }
+
+    pub fn rebuild_guest_name(&self, snapshot_name: &str) -> String {
+        format!(
+            "{}-{}@{snapshot_name}",
+            TOML.libvirt_rebuild_guest_prefix(),
+            self.profile_name
+        )
     }
 
     pub fn runner_guest_name(&self, id: usize) -> String {
@@ -33,3 +50,23 @@ impl Profile {
         )
     }
 }
+
+pub fn parse_template_guest_name(template_guest_name: &str) -> eyre::Result<(&str, &str)> {
+    let prefix = format!("{}-", TOML.libvirt_template_guest_prefix());
+    let (profile_key, snapshot_name) = template_guest_name
+        .strip_prefix(&prefix)
+        .ok_or_eyre("Failed to strip template guest prefix")?
+        .split_once("@")
+        .ok_or_eyre("Failed to split snapshot path slug into profile key and snapshot name")?;
+    Ok((profile_key, snapshot_name))
+}
+
+pub fn parse_rebuild_guest_name(rebuild_guest_name: &str) -> eyre::Result<(&str, &str)> {
+    let prefix = format!("{}-", TOML.libvirt_rebuild_guest_prefix());
+    let (profile_key, snapshot_name) = rebuild_guest_name
+        .strip_prefix(&prefix)
+        .ok_or_eyre("Failed to strip rebuild guest prefix")?
+        .split_once("@")
+        .ok_or_eyre("Failed to split snapshot path slug into profile key and snapshot name")?;
+    Ok((profile_key, snapshot_name))
+}