release: Add '--json' option for JSON output

change-type: minor

docs/balena-cli.md

@@ -1197,12 +1197,17 @@ produce JSON output instead of tabular output
 
 ## release <commitOrId>
 
-
+The --json option is recommended when scripting the output of this command,
+because field names are less likely to change in JSON format and because it
+better represents data types like arrays, empty strings and null values.
+The 'jq' utility may be helpful for querying JSON fields in shell scripts
+(https://stedolan.github.io/jq/manual/).
 
 Examples:
 
 	$ balena release a777f7345fe3d655c1c981aa642e5555
 	$ balena release 1234567
+	$ balena release d3f3151f5ad25ca6b070aa4d08296aca --json
 
 ### Arguments
 
@@ -1212,6 +1217,10 @@ the commit or ID of the release to get information
 
 ### Options
 
+#### -j, --json
+
+produce JSON output instead of tabular output
+
 #### -c, --composition
 
 Return the release composition

lib/commands/release/index.ts

@@ -15,30 +15,37 @@
  * limitations under the License.
  */
 
-import { Flags, Args } from '@oclif/core';
+import { Flags, Args, type Interfaces } from '@oclif/core';
 import Command from '../../command';
 import * as cf from '../../utils/common-flags';
 import { getBalenaSdk, getVisuals, stripIndent } from '../../utils/lazy';
 import type * as BalenaSdk from 'balena-sdk';
 import jsyaml = require('js-yaml');
 import { tryAsInteger } from '../../utils/validation';
+import { jsonInfo } from '../../utils/messages';
 
 export const commitOrIdArg = Args.custom({
 	parse: async (commitOrId: string) => tryAsInteger(commitOrId),
 });
 
+type FlagsDef = Interfaces.InferredFlags<typeof ReleaseCmd.flags>;
+
 export default class ReleaseCmd extends Command {
 	public static description = stripIndent`
 		Get info for a release.
+
+		${jsonInfo.split('\n').join('\n\t\t')}
 `;
 	public static examples = [
 		'$ balena release a777f7345fe3d655c1c981aa642e5555',
 		'$ balena release 1234567',
+		'$ balena release d3f3151f5ad25ca6b070aa4d08296aca --json',
 	];
 
 	public static usage = 'release <commitOrId>';
 
 	public static flags = {
+		json: cf.json,
 		help: cf.help,
 		composition: Flags.boolean({
 			default: false,
@@ -63,7 +70,7 @@ export default class ReleaseCmd extends Command {
 		if (options.composition) {
 			await this.showComposition(params.commitOrId, balena);
 		} else {
-			await this.showReleaseInfo(params.commitOrId, balena);
+			await this.showReleaseInfo(params.commitOrId, balena, options);
 		}
 	}
 
@@ -81,6 +88,7 @@ export default class ReleaseCmd extends Command {
 	async showReleaseInfo(
 		commitOrId: string | number,
 		balena: BalenaSdk.BalenaSDK,
+		options: FlagsDef,
 	) {
 		const fields: Array<keyof BalenaSdk.Release> = [
 			'id',
@@ -95,25 +103,29 @@ export default class ReleaseCmd extends Command {
 		];
 
 		const release = await balena.models.release.get(commitOrId, {
-			$select: fields,
+			...(!options.json && { $select: fields }),
 			$expand: {
 				release_tag: {
 					$select: ['tag_key', 'value'],
 				},
 			},
 		});
 
-		const tagStr = release
-			.release_tag!.map((t) => `${t.tag_key}=${t.value}`)
-			.join('\n');
-
-		const _ = await import('lodash');
-		const values = _.mapValues(
-			release,
-			(val) => val ?? 'N/a',
-		) as Dictionary<string>;
-		values['tags'] = tagStr;
-
-		console.log(getVisuals().table.vertical(values, [...fields, 'tags']));
+		if (options.json) {
+			console.log(JSON.stringify(release, null, 4));
+		} else {
+			const tagStr = release
+				.release_tag!.map((t) => `${t.tag_key}=${t.value}`)
+				.join('\n');
+
+			const _ = await import('lodash');
+			const values = _.mapValues(
+				release,
+				(val) => val ?? 'N/a',
+			) as Dictionary<string>;
+			values['tags'] = tagStr;
+
+			console.log(getVisuals().table.vertical(values, [...fields, 'tags']));
+		}
 	}
 }

tests/commands/release.spec.ts

@@ -56,6 +56,16 @@ describe('balena release', function () {
 		expect(lines[5]).to.be.equal('main:');
 	});
 
+	it('should print version information as JSON with the the -j/--json flag', async () => {
+		api.expectGetRelease();
+		const { err, out } = await runCommand('release 27fda508c --json');
+		expect(err).to.be.empty;
+		const json = JSON.parse(out.join(''));
+		expect(json.commit).to.equal('90247b54de4fa7a0a3cbc85e73c68039');
+		expect(json.release_tag[0].tag_key).to.equal('testtag1');
+		expect(json.composition.services.main.network_mode).to.equal('host');
+	});
+
 	it('should list releases', async () => {
 		api.expectGetRelease();
 		api.expectGetApplication();