migrations: Change aws control host-container source metadata to object

This migration will change the aws control host-container source
setting-generator from string to object setting-generator metadata
(that will generate source using sundog) on forward migration.
We will also add a strength file with value "weak".

In backward migration, it will reset the value of the source setting
generator as string and delete the strength metadata.

sources/settings-migrations/v1.33.0/update-settings-generator-control/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "update-settings-generator-control"
+version = "0.1.0"
+authors = ["Shikha Vyaghra <[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/v1.33.0/update-settings-generator-control/src/main.rs

@@ -0,0 +1,28 @@
+use migration_helpers::common_migrations::MetadataStringToStructMigration;
+use migration_helpers::{migrate, Result};
+use std::process;
+
+const OLD_CONTROL_CTR_CMDLINE: &str =
+    "schnauzer-v2 render --requires 'aws@v1(helpers=[ecr-prefix])' --template '{{ ecr-prefix settings.aws.region }}/bottlerocket-control:v0.7.20'";
+const NEW_CONTROL_CTR_CMDLINE: &str =
+    "schnauzer-v2 render --requires 'aws@v1(helpers=[ecr-prefix])' --template '{{ ecr-prefix settings.aws.region }}/bottlerocket-control:v0.7.20'";
+
+/// We bumped the version of the default control container
+fn run() -> Result<()> {
+    migrate(MetadataStringToStructMigration {
+        setting: "settings.host-containers.control.source",
+        old_cmdline: OLD_CONTROL_CTR_CMDLINE,
+        new_cmdline: NEW_CONTROL_CTR_CMDLINE,
+        skip_if_populated: true,
+    })
+}
+
+// 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);
+    }
+}