Updated dist files

dist/main/system_handlers.js

@@ -132,12 +132,25 @@ function registerSystemHandlers() {
                 headers['x-account-id'] = account_id;
             try {
                 const response = await (0, axios_1.default)({ method: 'get', url: image_url, responseType: 'stream', headers });
+                const content_type = (response.headers['content-type'] ?? '');
+                if (!content_type.startsWith('image/')) {
+                    response.data.destroy();
+                    return { success: false, error: `URL did not return an image (Content-Type: ${content_type})` };
+                }
                 const writer = fs.createWriteStream(dest_path);
                 response.data.pipe(writer);
                 await new Promise((resolve, reject) => {
                     writer.on('finish', resolve);
                     writer.on('error', reject);
                 });
+                const file_size = fs.statSync(dest_path).size;
+                if (file_size === 0) {
+                    try {
+                        fs.unlinkSync(dest_path);
+                    }
+                    catch { }
+                    return { success: false, error: 'Wallpaper download incomplete (0 bytes)' };
+                }
                 return { success: true, path: dest_path };
             }
             catch (e) {
@@ -185,6 +198,12 @@ function registerSystemHandlers() {
                     return { success: false, error: result.error };
                 primary_path = result.path;
             }
+            if (!primary_path && url_external && display === 'external') {
+                const ext_result = await download_wallpaper_image(url_external, 'wallpaper_external');
+                if (!ext_result.success || !ext_result.path)
+                    return { success: false, error: ext_result.error };
+                return await apply_mac_wallpaper(ext_result.path, 'external');
+            }
             if (!primary_path)
                 return { success: false, error: 'No image source provided' };
             if (url_external) {
@@ -193,26 +212,50 @@ function registerSystemHandlers() {
                 if (!primary_result.success)
                     return primary_result;
                 const ext_result = await download_wallpaper_image(url_external, 'wallpaper_external');
-                const ext_path = ext_result.success && ext_result.path ? ext_result.path : primary_path;
-                return await apply_mac_wallpaper(ext_path, 'external');
+                if (!ext_result.success || !ext_result.path)
+                    return { success: false, error: ext_result.error };
+                return await apply_mac_wallpaper(ext_result.path, 'external');
             }
             else {
                 return await apply_mac_wallpaper(primary_path, display);
             }
         }
         if (os.platform() === 'linux') {
-            let img_path = imagePath ? (0, file_utils_1.expandPath)(imagePath) : null;
-            if (!img_path && url) {
-                const result = await download_wallpaper_image(url, 'wallpaper_primary');
-                if (!result.success || !result.path)
-                    return { success: false, error: result.error };
-                img_path = result.path;
-            }
-            if (!img_path)
+            // Dev test mode: never touch the desktop on Linux. Running gsettings during
+            // development would reset the dev workstation monitors on every test cycle.
+            // Return what would have run so the Svelte side can show a debug popup.
+            const would_run = [];
+            const cache_dir = wallpaper_cache_dir;
+            if (!imagePath && !url && !url_external) {
                 return { success: false, error: 'No image source provided' };
-            if (!fs.existsSync(img_path))
-                return { success: false, error: 'Image file not found' };
-            return await runExec(`gsettings set org.gnome.desktop.background picture-uri "file://${img_path}"`);
+            }
+            if (imagePath) {
+                const clean = (0, file_utils_1.expandPath)(imagePath);
+                if (!fs.existsSync(clean))
+                    return { success: false, error: 'Image file not found' };
+            }
+            if (url)
+                would_run.push(`download: ${url}\n  → ${path.join(cache_dir, 'wallpaper_primary.jpg')}`);
+            if (url_external)
+                would_run.push(`download: ${url_external}\n  → ${path.join(cache_dir, 'wallpaper_external.jpg')}`);
+            if (imagePath) {
+                would_run.push(`gsettings set org.gnome.desktop.background picture-uri "file://${(0, file_utils_1.expandPath)(imagePath)}"`);
+            }
+            else if (url) {
+                would_run.push(`gsettings set org.gnome.desktop.background picture-uri "file://${path.join(cache_dir, 'wallpaper_primary.jpg')}"`);
+            }
+            if (url_external) {
+                would_run.push(`(external display: gsettings has no per-display wallpaper support)`);
+            }
+            return {
+                success: true,
+                linux_test_mode: true,
+                platform: 'linux',
+                display,
+                url: url ?? null,
+                url_external: url_external ?? null,
+                would_run
+            };
         }
         return { success: false, error: 'Platform not supported' };
     });

src/main/system_handlers.ts

@@ -96,12 +96,23 @@ export function registerSystemHandlers() {
 
       try {
         const response = await axios({ method: 'get', url: image_url, responseType: 'stream', headers });
+        const content_type = (response.headers['content-type'] ?? '') as string;
+        if (!content_type.startsWith('image/')) {
+          response.data.destroy();
+          return { success: false, error: `URL did not return an image (Content-Type: ${content_type})` };
+        }
+
         const writer = fs.createWriteStream(dest_path);
         response.data.pipe(writer);
         await new Promise<void>((resolve, reject) => {
           writer.on('finish', resolve);
           writer.on('error', reject);
         });
+        const file_size = fs.statSync(dest_path).size;
+        if (file_size === 0) {
+          try { fs.unlinkSync(dest_path); } catch {}
+          return { success: false, error: 'Wallpaper download incomplete (0 bytes)' };
+        }
         return { success: true, path: dest_path };
       } catch (e: any) {
         return { success: false, error: `Wallpaper download failed: ${e.message}` };
@@ -144,6 +155,12 @@ export function registerSystemHandlers() {
         primary_path = result.path;
       }
 
+      if (!primary_path && url_external && display === 'external') {
+        const ext_result = await download_wallpaper_image(url_external, 'wallpaper_external');
+        if (!ext_result.success || !ext_result.path) return { success: false, error: ext_result.error };
+        return await apply_mac_wallpaper(ext_result.path, 'external');
+      }
+
       if (!primary_path) return { success: false, error: 'No image source provided' };
 
       if (url_external) {
@@ -152,26 +169,50 @@ export function registerSystemHandlers() {
         if (!primary_result.success) return primary_result;
 
         const ext_result = await download_wallpaper_image(url_external, 'wallpaper_external');
-        const ext_path = ext_result.success && ext_result.path ? ext_result.path : primary_path;
-        return await apply_mac_wallpaper(ext_path, 'external');
+        if (!ext_result.success || !ext_result.path) return { success: false, error: ext_result.error };
+        return await apply_mac_wallpaper(ext_result.path, 'external');
       } else {
         return await apply_mac_wallpaper(primary_path, display);
       }
     }
 
     if (os.platform() === 'linux') {
-      let img_path: string | null = imagePath ? expandPath(imagePath) : null;
+      // Dev test mode: never touch the desktop on Linux. Running gsettings during
+      // development would reset the dev workstation monitors on every test cycle.
+      // Return what would have run so the Svelte side can show a debug popup.
+      const would_run: string[] = [];
+      const cache_dir = wallpaper_cache_dir;
 
-      if (!img_path && url) {
-        const result = await download_wallpaper_image(url, 'wallpaper_primary');
-        if (!result.success || !result.path) return { success: false, error: result.error };
-        img_path = result.path;
+      if (!imagePath && !url && !url_external) {
+        return { success: false, error: 'No image source provided' };
       }
 
-      if (!img_path) return { success: false, error: 'No image source provided' };
-      if (!fs.existsSync(img_path)) return { success: false, error: 'Image file not found' };
+      if (imagePath) {
+        const clean = expandPath(imagePath);
+        if (!fs.existsSync(clean)) return { success: false, error: 'Image file not found' };
+      }
 
-      return await runExec(`gsettings set org.gnome.desktop.background picture-uri "file://${img_path}"`);
+      if (url) would_run.push(`download: ${url}\n  → ${path.join(cache_dir, 'wallpaper_primary.jpg')}`);
+      if (url_external) would_run.push(`download: ${url_external}\n  → ${path.join(cache_dir, 'wallpaper_external.jpg')}`);
+
+      if (imagePath) {
+        would_run.push(`gsettings set org.gnome.desktop.background picture-uri "file://${expandPath(imagePath)}"`);
+      } else if (url) {
+        would_run.push(`gsettings set org.gnome.desktop.background picture-uri "file://${path.join(cache_dir, 'wallpaper_primary.jpg')}"`);
+      }
+      if (url_external) {
+        would_run.push(`(external display: gsettings has no per-display wallpaper support)`);
+      }
+
+      return {
+        success: true,
+        linux_test_mode: true,
+        platform: 'linux',
+        display,
+        url: url ?? null,
+        url_external: url_external ?? null,
+        would_run
+      };
     }
 
     return { success: false, error: 'Platform not supported' };