Fix xterm scroll jump and viewport desync during long output

Auto-scroll viewport on new output when user is at bottom, debounce
scroll state updates to reduce re-renders, preserve scroll position
across resize reflows, and fix "Jump to Current" button by re-fitting
the terminal to clear viewport desync.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/build.yml

@@ -36,6 +36,13 @@ jobs:
           username: ${{ gitea.actor }}
           password: ${{ secrets.REGISTRY_TOKEN }}
 
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: shadowdao
+          password: ${{ secrets.GH_PAT }}
+
       - name: Build and push container image
         uses: docker/build-push-action@v5
         with:
@@ -46,5 +53,7 @@ jobs:
           tags: |
             ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
             ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ gitea.sha }}
+            ghcr.io/shadowdao/triple-c-sandbox:latest
+            ghcr.io/shadowdao/triple-c-sandbox:${{ gitea.sha }}
           cache-from: type=gha
           cache-to: type=gha,mode=max

HOW-TO-USE.md

@@ -70,7 +70,7 @@ Choose an **Image Source**:
 
 | Source | Description | When to Use |
 |--------|-------------|-------------|
-| **Registry** | Pulls the pre-built image from `repo.anhonesthost.net` | Fastest setup — recommended for most users |
+| **Registry** | Pulls the pre-built image from `ghcr.io` | Fastest setup — recommended for most users |
 | **Local Build** | Builds the image locally from the embedded Dockerfile | If you can't reach the registry, or want a custom build |
 | **Custom** | Use any Docker image you specify | Advanced — bring your own sandbox image |
 

app/src-tauri/src/commands/help_commands.rs

@@ -2,7 +2,7 @@ use std::sync::OnceLock;
 use tokio::sync::Mutex;
 
 const HELP_URL: &str =
-    "https://repo.anhonesthost.net/cybercovellc/triple-c/raw/branch/main/HOW-TO-USE.md";
+    "https://raw.githubusercontent.com/shadowdao/triple-c/main/HOW-TO-USE.md";
 
 const EMBEDDED_HELP: &str = include_str!("../../../../HOW-TO-USE.md");
 

app/src-tauri/src/commands/update_commands.rs

@@ -1,15 +1,20 @@
+use serde::Deserialize;
 use tauri::State;
 
 use crate::docker;
-use crate::models::{container_config, GiteaRelease, ImageUpdateInfo, ReleaseAsset, UpdateInfo};
+use crate::models::{container_config, GitHubRelease, ImageUpdateInfo, ReleaseAsset, UpdateInfo};
 use crate::AppState;
 
 const RELEASES_URL: &str =
-    "https://repo.anhonesthost.net/api/v1/repos/cybercovellc/triple-c/releases";
+    "https://api.github.com/repos/shadowdao/triple-c/releases";
 
-/// Gitea container-registry tag object (v2 manifest).
+/// GHCR container-registry API base (OCI distribution spec).
 const REGISTRY_API_BASE: &str =
-    "https://repo.anhonesthost.net/v2/cybercovellc/triple-c/triple-c-sandbox";
+    "https://ghcr.io/v2/shadowdao/triple-c-sandbox";
+
+/// GHCR token endpoint for anonymous pull access.
+const GHCR_TOKEN_URL: &str =
+    "https://ghcr.io/token?scope=repository:shadowdao/triple-c-sandbox:pull";
 
 #[tauri::command]
 pub fn get_app_version() -> String {
@@ -23,9 +28,10 @@ pub async fn check_for_updates() -> Result<Option<UpdateInfo>, String> {
         .build()
         .map_err(|e| format!("Failed to create HTTP client: {}", e))?;
 
-    let releases: Vec<GiteaRelease> = client
+    let releases: Vec<GitHubRelease> = client
         .get(RELEASES_URL)
         .header("Accept", "application/json")
+        .header("User-Agent", "triple-c-updater")
         .send()
         .await
         .map_err(|e| format!("Failed to fetch releases: {}", e))?
@@ -36,30 +42,27 @@ pub async fn check_for_updates() -> Result<Option<UpdateInfo>, String> {
     let current_version = env!("CARGO_PKG_VERSION");
     let current_semver = parse_semver(current_version).unwrap_or((0, 0, 0));
 
-    // Determine platform suffix for tag filtering
+    // Determine platform-specific asset extensions
-    let platform_suffix: &str = if cfg!(target_os = "windows") {
+    let platform_extensions: &[&str] = if cfg!(target_os = "windows") {
-        "-win"
+        &[".msi", ".exe"]
     } else if cfg!(target_os = "macos") {
-        "-mac"
+        &[".dmg", ".app.tar.gz"]
     } else {
-        "" // Linux uses bare tags (no suffix)
+        &[".AppImage", ".deb", ".rpm"]
     };
 
-    // Filter releases by platform tag suffix
+    // Filter releases that have at least one asset matching the current platform
-    let platform_releases: Vec<&GiteaRelease> = releases
+    let platform_releases: Vec<&GitHubRelease> = releases
         .iter()
         .filter(|r| {
-            if platform_suffix.is_empty() {
+            r.assets.iter().any(|a| {
-                // Linux: bare tag only (no -win, no -mac)
+                platform_extensions.iter().any(|ext| a.name.ends_with(ext))
-                !r.tag_name.ends_with("-win") && !r.tag_name.ends_with("-mac")
+            })
-            } else {
-                r.tag_name.ends_with(platform_suffix)
-            }
         })
         .collect();
 
     // Find the latest release with a higher semver version
-    let mut best: Option<(&GiteaRelease, (u32, u32, u32))> = None;
+    let mut best: Option<(&GitHubRelease, (u32, u32, u32))> = None;
     for release in &platform_releases {
         if let Some(ver) = parse_semver_from_tag(&release.tag_name) {
             if ver > current_semver {
@@ -72,9 +75,13 @@ pub async fn check_for_updates() -> Result<Option<UpdateInfo>, String> {
 
     match best {
         Some((release, _)) => {
+            // Only include assets matching the current platform
             let assets = release
                 .assets
                 .iter()
+                .filter(|a| {
+                    platform_extensions.iter().any(|ext| a.name.ends_with(ext))
+                })
                 .map(|a| ReleaseAsset {
                     name: a.name.clone(),
                     browser_download_url: a.browser_download_url.clone(),
@@ -82,7 +89,6 @@ pub async fn check_for_updates() -> Result<Option<UpdateInfo>, String> {
                 })
                 .collect();
 
-            // Reconstruct version string from tag
             let version = extract_version_from_tag(&release.tag_name)
                 .unwrap_or_else(|| release.tag_name.clone());
 
@@ -113,17 +119,13 @@ fn parse_semver(version: &str) -> Option<(u32, u32, u32)> {
     }
 }
 
-/// Parse semver from a tag like "v0.2.5", "v0.2.5-win", "v0.2.5-mac" -> (0, 2, 5)
+/// Parse semver from a tag like "v0.2.5" -> (0, 2, 5)
 fn parse_semver_from_tag(tag: &str) -> Option<(u32, u32, u32)> {
     let clean = tag.trim_start_matches('v');
-    // Remove platform suffix
-    let clean = clean.strip_suffix("-win")
-        .or_else(|| clean.strip_suffix("-mac"))
-        .unwrap_or(clean);
     parse_semver(clean)
 }
 
-/// Extract a clean version string from a tag like "v0.2.5-win" -> "0.2.5"
+/// Extract a clean version string from a tag like "v0.2.5" -> "0.2.5"
 fn extract_version_from_tag(tag: &str) -> Option<String> {
     let (major, minor, patch) = parse_semver_from_tag(tag)?;
     Some(format!("{}.{}.{}", major, minor, patch))
@@ -152,7 +154,7 @@ pub async fn check_image_update(
     // 1. Get local image digest via Docker
     let local_digest = docker::get_local_image_digest(&image_name).await.ok().flatten();
 
-    // 2. Get remote digest from the Gitea container registry (OCI distribution spec)
+    // 2. Get remote digest from the GHCR container registry (OCI distribution spec)
     let remote_digest = fetch_remote_digest("latest").await?;
 
     // No remote digest available — nothing to compare
@@ -176,25 +178,36 @@ pub async fn check_image_update(
     }))
 }
 
-/// Fetch the digest of a tag from the Gitea container registry using the
+/// Fetch the digest of a tag from GHCR using the OCI / Docker Registry HTTP API v2.
-/// OCI / Docker Registry HTTP API v2.
 ///
-/// We issue a HEAD request to /v2/<repo>/manifests/<tag> and read the
+/// GHCR requires authentication even for public images, so we first obtain an
-/// `Docker-Content-Digest` header that the registry returns.
+/// anonymous token, then issue a HEAD request to /v2/<repo>/manifests/<tag>
+/// and read the `Docker-Content-Digest` header.
 async fn fetch_remote_digest(tag: &str) -> Result<Option<String>, String> {
-    let url = format!("{}/manifests/{}", REGISTRY_API_BASE, tag);
-
     let client = reqwest::Client::builder()
         .timeout(std::time::Duration::from_secs(15))
         .build()
         .map_err(|e| format!("Failed to create HTTP client: {}", e))?;
 
+    // 1. Obtain anonymous bearer token from GHCR
+    let token = match fetch_ghcr_token(&client).await {
+        Ok(t) => t,
+        Err(e) => {
+            log::warn!("Failed to obtain GHCR token: {}", e);
+            return Ok(None);
+        }
+    };
+
+    // 2. HEAD the manifest with the token
+    let url = format!("{}/manifests/{}", REGISTRY_API_BASE, tag);
+
     let response = client
         .head(&url)
         .header(
             "Accept",
             "application/vnd.docker.distribution.manifest.v2+json, application/vnd.oci.image.index.v1+json",
         )
+        .header("Authorization", format!("Bearer {}", token))
         .send()
         .await;
 
@@ -221,3 +234,23 @@ async fn fetch_remote_digest(tag: &str) -> Result<Option<String>, String> {
         }
     }
 }
+
+/// Fetch an anonymous bearer token from GHCR for pulling public images.
+async fn fetch_ghcr_token(client: &reqwest::Client) -> Result<String, String> {
+    #[derive(Deserialize)]
+    struct TokenResponse {
+        token: String,
+    }
+
+    let resp: TokenResponse = client
+        .get(GHCR_TOKEN_URL)
+        .header("User-Agent", "triple-c-updater")
+        .send()
+        .await
+        .map_err(|e| format!("GHCR token request failed: {}", e))?
+        .json()
+        .await
+        .map_err(|e| format!("Failed to parse GHCR token response: {}", e))?;
+
+    Ok(resp.token)
+}

app/src-tauri/src/models/container_config.rs

@@ -12,7 +12,7 @@ pub struct ContainerInfo {
 
 pub const LOCAL_IMAGE_NAME: &str = "triple-c";
 pub const IMAGE_TAG: &str = "latest";
-pub const REGISTRY_IMAGE: &str = "repo.anhonesthost.net/cybercovellc/triple-c/triple-c-sandbox:latest";
+pub const REGISTRY_IMAGE: &str = "ghcr.io/shadowdao/triple-c-sandbox:latest";
 
 pub fn local_build_image_name() -> String {
     format!("{LOCAL_IMAGE_NAME}:{IMAGE_TAG}")

app/src-tauri/src/models/update_info.rs

@@ -18,19 +18,19 @@ pub struct ReleaseAsset {
     pub size: u64,
 }
 
-/// Gitea API release response (internal).
+/// GitHub API release response (internal).
 #[derive(Debug, Clone, Deserialize)]
-pub struct GiteaRelease {
+pub struct GitHubRelease {
     pub tag_name: String,
     pub html_url: String,
     pub body: String,
-    pub assets: Vec<GiteaAsset>,
+    pub assets: Vec<GitHubAsset>,
     pub published_at: String,
 }
 
-/// Gitea API asset response (internal).
+/// GitHub API asset response (internal).
 #[derive(Debug, Clone, Deserialize)]
-pub struct GiteaAsset {
+pub struct GitHubAsset {
     pub name: String,
     pub browser_download_url: String,
     pub size: u64,

app/src/components/settings/DockerSettings.tsx

@@ -4,7 +4,7 @@ import { useSettings } from "../../hooks/useSettings";
 import type { ImageSource } from "../../lib/types";
 import Tooltip from "../ui/Tooltip";
 
-const REGISTRY_IMAGE = "repo.anhonesthost.net/cybercovellc/triple-c/triple-c-sandbox:latest";
+const REGISTRY_IMAGE = "ghcr.io/shadowdao/triple-c-sandbox:latest";
 
 const IMAGE_SOURCE_OPTIONS: { value: ImageSource; label: string; description: string }[] = [
   { value: "registry", label: "Registry", description: "Pull from container registry" },

app/src/components/terminal/TerminalView.tsx

@@ -35,6 +35,7 @@ export default function TerminalView({ sessionId, active }: Props) {
   const [detectedUrl, setDetectedUrl] = useState<string | null>(null);
   const [imagePasteMsg, setImagePasteMsg] = useState<string | null>(null);
   const [isAtBottom, setIsAtBottom] = useState(true);
+  const isAtBottomRef = useRef(true);
 
   useEffect(() => {
     if (!containerRef.current) return;
@@ -131,10 +132,19 @@ export default function TerminalView({ sessionId, active }: Props) {
       sendInput(sessionId, data);
     });
 
-    // Track scroll position to show "Jump to Current" button
+    // Track scroll position to show "Jump to Current" button.
+    // Debounce state updates via rAF to avoid excessive re-renders during rapid output.
+    let scrollStateRafId: number | null = null;
     const scrollDisposable = term.onScroll(() => {
       const buf = term.buffer.active;
-      setIsAtBottom(buf.viewportY >= buf.baseY);
+      const atBottom = buf.viewportY >= buf.baseY;
+      isAtBottomRef.current = atBottom;
+      if (scrollStateRafId === null) {
+        scrollStateRafId = requestAnimationFrame(() => {
+          scrollStateRafId = null;
+          setIsAtBottom(isAtBottomRef.current);
+        });
+      }
     });
 
     // Track text selection to show copy hint in status bar
@@ -187,7 +197,15 @@ export default function TerminalView({ sessionId, active }: Props) {
 
     const outputPromise = onOutput(sessionId, (data) => {
       if (aborted) return;
-      term.write(data);
+      const shouldFollow = isAtBottomRef.current;
+      term.write(data, () => {
+        // Keep viewport pinned to bottom when user hasn't scrolled up
+        if (shouldFollow) {
+          term.scrollToBottom();
+          isAtBottomRef.current = true;
+          setIsAtBottom(true);
+        }
+      });
       detector.feed(data);
 
       // Scan for SSO refresh marker in terminal output
@@ -229,8 +247,13 @@ export default function TerminalView({ sessionId, active }: Props) {
       resizeRafId = requestAnimationFrame(() => {
         resizeRafId = null;
         if (!containerRef.current || containerRef.current.offsetWidth === 0) return;
+        const wasAtBottom = isAtBottomRef.current;
         fitAddon.fit();
         resize(sessionId, term.cols, term.rows);
+        // Maintain scroll position after resize reflow
+        if (wasAtBottom) {
+          term.scrollToBottom();
+        }
       });
     });
     resizeObserver.observe(containerRef.current);
@@ -249,6 +272,7 @@ export default function TerminalView({ sessionId, active }: Props) {
       containerRef.current?.removeEventListener("paste", handlePaste, { capture: true });
       outputPromise.then((fn) => fn?.());
       exitPromise.then((fn) => fn?.());
+      if (scrollStateRafId !== null) cancelAnimationFrame(scrollStateRafId);
       if (resizeRafId !== null) cancelAnimationFrame(resizeRafId);
       resizeObserver.disconnect();
       try { webglRef.current?.dispose(); } catch { /* may already be disposed */ }
@@ -314,8 +338,14 @@ export default function TerminalView({ sessionId, active }: Props) {
   }, [detectedUrl]);
 
   const handleScrollToBottom = useCallback(() => {
-    termRef.current?.scrollToBottom();
+    const term = termRef.current;
+    if (term) {
+      // Re-fit first to fix viewport desync (same thing a resize does)
+      fitRef.current?.fit();
+      term.scrollToBottom();
+      isAtBottomRef.current = true;
       setIsAtBottom(true);
+    }
   }, []);
 
   return (