migrations: add the memory-swap-behavior k8s setting

Author: teskje

Release.toml

@@ -426,4 +426,5 @@ version = "1.42.0"
     "migrate_v1.41.0_kubernetes-ecr-credential-providers-correction.lz4",
 ]
 "(1.41.0, 1.42.0)" = [
+    "migrate_v1.42.0_kubernetes-memory-swap-behavior-setting.lz4",
 ]

sources/Cargo.lock

@@ -37,6 +37,7 @@ members = [
     "settings-migrations/v1.39.0/kubelet-setting-container-log-single-process-oom-kill",
     "settings-migrations/v1.40.0/kubelet-device-plugins-cdi-settings",
     "settings-migrations/v1.41.0/kubernetes-ecr-credential-providers-correction",
+    "settings-migrations/v1.42.0/kubernetes-memory-swap-behavior-setting",
 
     "settings-plugins/aws-dev",
     "settings-plugins/aws-ecs-1",

sources/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "kubernetes-memory-swap-behavior-setting"
+version = "0.1.0"
+authors = ["Jan Teske <[email protected]>"]
+license = "Apache-2.0 OR MIT"
+edition = "2021"
+publish = false
+# Don't rebuild crate just because of changes to README.
+exclude = ["README.md"]
+
+[dependencies]
+migration-helpers.workspace = true

sources/settings-migrations/v1.42.0/kubernetes-memory-swap-behavior-setting/Cargo.toml

@@ -0,0 +1,20 @@
+use migration_helpers::common_migrations::AddSettingsMigration;
+use migration_helpers::{migrate, Result};
+use std::process;
+
+// We added a new kubernetes setting controlling the memory swap behavior.
+fn run() -> Result<()> {
+    migrate(AddSettingsMigration(&[
+        "settings.kubernetes.memory-swap-behavior",
+    ]))
+}
+
+// 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);
+    }
+}