Add migrations for settings.network.hostname

This adds the migrations needed for `settings.network.hostname`, one for
the setting, its service and configuration file, and one for the setting
generator metadata.

Release.toml

@@ -59,3 +59,7 @@ version = "1.1.4"
     "migrate_v1.1.3_kubelet-cpu-manager.lz4",
 ]
 "(1.1.3, 1.1.4)" = []
+"(1.1.4, 1.1.5)" = [
+    "migrate_v1.1.5_hostname-setting.lz4",
+    "migrate_v1.1.5_hostname-setting-metadata.lz4",
+]

sources/Cargo.toml

@@ -37,6 +37,8 @@ members = [
     "api/migration/migrations/v1.1.2/control-container-v0-5-1",
     "api/migration/migrations/v1.1.3/kubelet-cpu-manager-state",
     "api/migration/migrations/v1.1.3/kubelet-cpu-manager",
+    "api/migration/migrations/v1.1.5/hostname-setting",
+    "api/migration/migrations/v1.1.5/hostname-setting-metadata",
 
     "bottlerocket-release",
 

sources/api/migration/migrations/v1.1.5/hostname-setting-metadata/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "hostname-setting-metadata"
+version = "0.1.0"
+authors = ["Zac Mrowicki <mrowicki@amazon.com>"]
+license = "Apache-2.0 OR MIT"
+edition = "2018"
+publish = false
+# Don't rebuild crate just because of changes to README.
+exclude = ["README.md"]
+
+[dependencies]
+migration-helpers = { path = "../../../migration-helpers" }

sources/api/migration/migrations/v1.1.5/hostname-setting-metadata/src/main.rs

@@ -0,0 +1,23 @@
+#![deny(rust_2018_idioms)]
+
+use migration_helpers::common_migrations::{AddMetadataMigration, SettingMetadata};
+use migration_helpers::{migrate, Result};
+use std::process;
+
+/// We added a new setting and generator for configuring hostname
+fn run() -> Result<()> {
+    migrate(AddMetadataMigration(&[SettingMetadata {
+        metadata: &["setting-generator", "affected-services"],
+        setting: "settings.network.hostname",
+    }]))
+}
+
+// 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);
+    }
+}

sources/api/migration/migrations/v1.1.5/hostname-setting/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "hostname-setting"
+version = "0.1.0"
+authors = ["Zac Mrowicki <mrowicki@amazon.com>"]
+license = "Apache-2.0 OR MIT"
+edition = "2018"
+publish = false
+# Don't rebuild crate just because of changes to README.
+exclude = ["README.md"]
+
+[dependencies]
+migration-helpers = { path = "../../../migration-helpers" }

sources/api/migration/migrations/v1.1.5/hostname-setting/src/main.rs

@@ -0,0 +1,24 @@
+#![deny(rust_2018_idioms)]
+
+use migration_helpers::common_migrations::AddPrefixesMigration;
+use migration_helpers::{migrate, Result};
+use std::process;
+
+/// We added a new setting and generator for configuring hostname
+fn run() -> Result<()> {
+    migrate(AddPrefixesMigration(vec![
+        "settings.network.hostname",
+        "services.hostname",
+        "configuration-files.hostname",
+    ]))
+}
+
+// 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);
+    }
+}