K8s kubelet reserved-cpus migration

Release.toml

@@ -315,4 +315,5 @@ version = "1.21.0"
 "(1.20.0, 1.20.1)" = []
 "(1.20.1, 1.21.0)" = [
     "migrate_v1.21.0_pluto-remove-generators-v0-1-0.lz4",
+    "migrate_v1.21.0_k8s-reserved-cpus-v0-1-0.lz4",
 ]

sources/Cargo.toml

@@ -24,6 +24,7 @@ members = [
     # "api/migration/migrations/vX.Y.Z/..."
     # (all previous migrations archived; add new ones after this line)
     "api/migration/migrations/v1.21.0/pluto-remove-generators-v0-1-0",
+    "api/migration/migrations/v1.21.0/k8s-reserved-cpus-v0-1-0",
 
     "bloodhound",
 

sources/api/migration/migrations/v1.21.0/k8s-reserved-cpus-v0-1-0/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "k8s-reserved-cpus-v0-1-0"
+version = "0.1.0"
+authors = ["James Masson <[email protected]>"]
+license = "Apache-2.0 OR MIT"
+edition = "2021"
+publish = false
+
+[dependencies]
+migration-helpers = { path = "../../../migration-helpers", version = "0.1.0" }

sources/api/migration/migrations/v1.21.0/k8s-reserved-cpus-v0-1-0/src/main.rs

@@ -0,0 +1,18 @@
+use migration_helpers::common_migrations::AddSettingsMigration;
+use migration_helpers::{migrate, Result};
+use std::process;
+
+/// Add the option to set Kubernetes reserved-cpus
+fn run() -> Result<()> {
+    migrate(AddSettingsMigration(&["settings.kubernetes.reserved-cpus"]))
+}
+
+// Returning a Result from main makes it print a Debug representation of the error, but with Snafu
+// we have nice Display representations of the error, so we wrap "main" (run) and print any error.
+// https://github.com/shepmaster/snafu/issues/110
+fn main() {
+    if let Err(e) = run() {
+        eprintln!("{}", e);
+        process::exit(1);
+    }
+}