fix: handle non-exist repository

src/docker_hub.rs

@@ -1,3 +1,4 @@
+use std::io::Write;
 use serde::{Deserialize, Serialize};
 use crate::{DockerTagsFetcher, QueryArgs};
 
@@ -61,12 +62,18 @@ impl DockerTagsFetcher for DockerHubTagsFetcher {
         let mut url = format!("https://hub.docker.com/v2/namespaces/{namespace}/repositories/{repository}/tags?page={page}&page_size={page_size}");
         let mut results: Vec<DockerResult> = Vec::new();
         loop {
-            let text = reqwest::blocking::get(url).unwrap().text().unwrap();
-            let mut response: DockerResponse = serde_json::from_str(&text).unwrap();
-            results.append(&mut response.results);
-            url = match response.next {
-                None => { break; }
-                Some(next) => { next }
+            let resp = reqwest::blocking::get(&url).unwrap();
+            if resp.status().is_success() {
+                let text = resp.text().unwrap();
+                let mut response: DockerResponse = serde_json::from_str(&text).unwrap();
+                results.append(&mut response.results);
+                url = match response.next {
+                    None => { break; }
+                    Some(next) => { next }
+                };
+            } else {
+                let _x = writeln!(std::io::stdout(), "Image not found: {}/{}", namespace, repository);
+                break;
             };
         }
         let mut filtered = results.into_iter()

src/registry.rs

@@ -39,7 +39,10 @@ impl DockerTagsFetcher for RegistryTagsFetcher {
         let mut results = Vec::<String>::new();
         if let Ok(r) = response {
             let json: RegistryTagsResponse = serde_json::from_str(r.text().unwrap().as_str()).unwrap();
-            results.append(&mut json.tags.unwrap());
+            match json.tags {
+                Some(mut x) => { results.append(&mut x); }
+                None => { results.push(format!("Image not found: {}/{}", namespace, repository)); }
+            }
         };
         results
     }