os configure: Given the found boot partition precedence over the devi…

…ce-type.json contents

Change-type: minor

src/utils/helpers.ts

@@ -110,6 +110,22 @@ export async function getManifest(
 	const init = await import('balena-device-init');
 	const sdk = getBalenaSdk();
 	const manifest = await init.getImageManifest(image);
+	if (manifest != null) {
+		const config = manifest.configuration?.config;
+		if (config?.partition != null) {
+			const { getBootPartition } = await import('balena-config-json');
+			if (typeof config.partition === 'number') {
+				config.partition = await getBootPartition(image);
+			} else if (config.partition.primary != null) {
+				config.partition.primary = await getBootPartition(image);
+			}
+		}
+	} else {
+		// TODO: Change this in the next major to throw, after confirming that this works for all supported OS versions.
+		console.error(
+			`[warn] Error while finding a device-type.json on the provided image path. Attempting to fetch from the API.`,
+		);
+	}
 	if (
 		manifest != null &&
 		manifest.slug !== deviceType &&

tests/commands/os/configure.spec.ts

@@ -74,7 +74,10 @@ if (process.platform !== 'win32') {
 					[warn]   Assuming default boot partition number '1'.
 					[warn] "${tmpPath}":
 					[warn]   Could not find a previous "/config.json" file in partition '1'.
-					[warn]   Proceeding anyway, but this is unexpected.`.split('\n'),
+					[warn]   Proceeding anyway, but this is unexpected.
+					[warn] Error while finding a device-type.json on the provided image path. Attempting to fetch from the API.`.split(
+					'\n',
+				),
 			);
 
 			// confirm the image contains a config.json...