Allow ig.ini to have other sections in addition to [IG]

src/ig/IGExporter.ts

@@ -1490,8 +1490,8 @@ export class IGExporter {
       $1 ? $0.replace($1, `\\${$1}`) : $0
     );
     const inputIni = ini.parse(inputIniContents);
-    if (Object.keys(inputIni).length > 1 || inputIni.IG == null) {
-      logger.error('ig.ini file must contain an [IG] section with no other sections', {
+    if (inputIni.IG == null) {
+      logger.error('The ig.ini file must contain an [IG] section.', {
         file: inputIniPath
       });
     }

test/ig/IGExporter.ig-ini.test.ts

@@ -90,6 +90,29 @@ describe('IGExporter', () => {
       expect(loggerSpy.getAllMessages()).toHaveLength(0);
     });
 
+    it('should log an error when ig.ini does not have an [IG] section', () => {
+      const pkg = new Package(minimalConfig);
+      const igDataPath = path.resolve(__dirname, 'fixtures', 'ig-ini-missing-ig-section');
+      const exporter = new IGExporter(pkg, null, igDataPath);
+      exporter.checkIgIni();
+      const igIniPath = path.join(tempOut, 'ig.ini');
+      expect(fs.existsSync(igIniPath)).toBeFalsy();
+      expect(loggerSpy.getAllMessages()).toHaveLength(1);
+      expect(loggerSpy.getLastMessage('error')).toMatch(
+        'The ig.ini file must contain an [IG] section.'
+      );
+    });
+
+    it('should not log an error or warning when ig.ini has additional sections', () => {
+      const pkg = new Package(minimalConfig);
+      const igDataPath = path.resolve(__dirname, 'fixtures', 'ig-ini-with-extra-sections');
+      const exporter = new IGExporter(pkg, null, igDataPath);
+      exporter.checkIgIni();
+      const igIniPath = path.join(tempOut, 'ig.ini');
+      expect(fs.existsSync(igIniPath)).toBeFalsy();
+      expect(loggerSpy.getAllMessages()).toHaveLength(0);
+    });
+
     it('should log a warning when ig property in ig.ini does not point to SUSHI IG JSON', () => {
       const pkg = new Package(minimalConfig);
       const igDataPath = path.resolve(__dirname, 'fixtures', 'ig-ini-with-non-generated-ig');

test/ig/fixtures/ig-ini-missing-ig-section/ig.ini

@@ -0,0 +1,2 @@
+[DefinitelyNotAnIG]
+foo = bar

test/ig/fixtures/ig-ini-with-extra-sections/ig.ini

@@ -0,0 +1,9 @@
+[SomeSection]
+foo = bar
+
+[IG]
+ig = fsh-generated/resources/ImplementationGuide-fhir.us.minimal.json
+template = hl7.fhir.template#0.1.0
+
+[SomeOtherSection]
+bar = bat