migration: add settings migration for kernel sysctl hugepages

Signed-off-by: Yutong Sun <[email protected]>

Release.toml

@@ -1,4 +1,4 @@
-version = "1.27.0"
+version = "1.28.0"
 
 [migrations]
 "(0.3.1, 0.3.2)" = ["migrate_v0.3.2_admin-container-v0-5-0.lz4"]
@@ -371,3 +371,6 @@ version = "1.27.0"
 "(1.26.2, 1.27.0)" = [
     "migrate_v1.27.0_aws-config.lz4",
 ]
+"(1.27.0, 1.28.0)" = [
+    "migrate_v1.28.0_kernel-sysctl-hugepages.lz4"
+]

Twoliter.toml

@@ -1,5 +1,5 @@
 schema-version = 1
-release-version = "1.27.0"
+release-version = "1.28.0"
 
 [vendor.bottlerocket]
 registry = "public.ecr.aws/bottlerocket"

sources/Cargo.toml

@@ -66,6 +66,7 @@ members = [
     "settings-migrations/v1.25.0/aws-control-container-v0-7-17",
     "settings-migrations/v1.25.0/public-control-container-v0-7-17",
     "settings-migrations/v1.27.0/aws-config",
+    "settings-migrations/v1.28.0/kernel-sysctl-hugepages",
     "settings-plugins/aws-dev",
     "settings-plugins/aws-ecs-1",
     "settings-plugins/aws-ecs-2",

sources/settings-migrations/v1.28.0/kernel-sysctl-hugepages/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "kernel-sysctl-hugepages"
+version = "0.1.0"
+authors = ["Yutong Sun <[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"]
+
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+migration-helpers.workspace = true

sources/settings-migrations/v1.28.0/kernel-sysctl-hugepages/src/main.rs

@@ -0,0 +1,21 @@
+use migration_helpers::common_migrations::{AddMetadataMigration, SettingMetadata};
+use migration_helpers::{migrate, Result};
+use std::process;
+
+///  We added new settings metadata, `metadata.settings.kernel.sysctl.vm/nr_hugepages.setting-generator`
+fn run() -> Result<()> {
+    migrate(AddMetadataMigration(&[SettingMetadata {
+        metadata: &["setting-generator"],
+        setting: "settings.kernel.sysctl.vm/nr_hugepages",
+    }]))
+}
+
+// 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);
+    }
+}