Preview: Dev-Modus nur mit dev-Skript waehlbar

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

server/services/previewDeploy.js

@@ -540,6 +540,7 @@ export async function syncPreviewTlsOnStartup({
 // ---- Preview-Runner (PREVIEW_RUNNER=on) ----
 
 // Zeiten des Hintergrund-Verfolgers (fuer Tests ueberschreibbar)
+const NO_DEV_SCRIPT_ERROR = 'Kein dev-Skript in package.json'
 export const runnerTiming = { pollMs: 2000, maxMs: 60 * 60 * 1000, unreachableMs: 5 * 60 * 1000 }
 // Neuester Lauf je Repo: aeltere Verfolger schreiben nichts mehr (R14)
 const latestRun = new Map()
@@ -679,7 +680,9 @@ async function followRun({ repoFullName, project, token, runId, subdomain, job,
     } else {
       await patchProject(repoFullName, project, {
         previewState: 'failed',
-        previewError: maskLog(failure || run?.error || 'Preview-Build fehlgeschlagen', env),
+        previewError: run?.error === NO_DEV_SCRIPT_ERROR && !failure
+          ? 'Dev-Modus hier nicht möglich – statische Version ist online'
+          : maskLog(failure || run?.error || 'Preview-Build fehlgeschlagen', env),
       })
     }
     if (!current()) return

server/services/previewDevScript.js

@@ -0,0 +1,35 @@
+// Prueft, ob ein Repo-Branch ein dev-Skript in package.json hat (Dev-Modus nur dann sinnvoll).
+import { giteaFetch, splitRepo } from './giteaClient.js'
+
+export const cacheTtlMs = 60 * 1000
+const cache = new Map()
+
+export function clearDevScriptCache() { cache.clear() }
+
+/** true = dev-Skript vorhanden, false = kein package.json oder kein dev-Skript, null = unbekannt (Gitea-Fehler). */
+export async function repoHasDevScript(repoFullName, branch) {
+  const key = `${repoFullName}@${branch}`
+  const hit = cache.get(key)
+  if (hit && Date.now() - hit.at < cacheTtlMs) return hit.value
+  const value = await lookup(repoFullName, branch)
+  cache.set(key, { at: Date.now(), value })
+  return value
+}
+
+async function lookup(repoFullName, branch) {
+  const [owner, repo] = splitRepo(repoFullName)
+  if (!owner || !repo) return null
+  let data
+  try {
+    data = await giteaFetch(`/repos/${owner}/${repo}/contents/package.json?ref=${encodeURIComponent(branch)}`)
+  } catch (err) {
+    return err?.status === 404 ? false : null
+  }
+  try {
+    const pkg = JSON.parse(Buffer.from(data?.content || '', 'base64').toString('utf8'))
+    const dev = pkg?.scripts?.dev
+    return typeof dev === 'string' && dev.trim() !== ''
+  } catch {
+    return null
+  }
+}