fix: handle empty lines in docker push result

Author: hellivan

src/lib/docker-utils.spec.ts

@@ -139,8 +139,11 @@ describe('pushImage', () => {
 
         dockerApiNock.post(`/images/${dockerImageWithTag}/push`).reply(
             200,
-            `{"status":"1.2.3: digest: sha256:17cdfd262dd5ed022949f33c54bdfc006d46799e2e2840022ef0798d58e374f6 size: 2200"}
-{"progressDetail":{},"aux":{"Tag":"1.2.3","Digest":"sha256:17cdfd262dd5ed022949f33c54bdfc006d46799e2e2840022ef0798d58e374f6","Size":2200}}`
+            `
+{"status":"1.2.3: digest: sha256:17cdfd262dd5ed022949f33c54bdfc006d46799e2e2840022ef0798d58e374f6 size: 2200"}
+
+{"progressDetail":{},"aux":{"Tag":"1.2.3","Digest":"sha256:17cdfd262dd5ed022949f33c54bdfc006d46799e2e2840022ef0798d58e374f6","Size":2200}}
+`
         );
 
         await pushImage(dockerImageWithTag, undefined);

src/lib/docker-utils.ts

@@ -65,9 +65,12 @@ export async function pushImage(existingTag: string, credentials: BasicCredentia
         .post<string>(`http://localhost/v1.41/images/${existingTag}/push`, {}, { headers });
 
     for (const line of result.data.split('\n')) {
-        const parsed = JSON.parse(line);
-        if (parsed.errorDetail != null || parsed.error != null) {
-            throw new Error(`Error while pushing image "${existingTag}": "${parsed.error}"`);
+        // skip empty lines
+        if (line.trim().length > 0) {
+            const parsed = JSON.parse(line);
+            if (parsed.error != null) {
+                throw new Error(`Error while pushing image "${existingTag}": "${parsed.error}"`);
+            }
         }
     }