fix: remove all stderr redirects so HF log API captures output

Reverted to original pattern: no redirects in background subshell,
let Python stderr flow naturally to container stderr for HF capture.
Sync daemon now also appends to /var/log/huggingrun.log directly.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/entrypoint.sh

@@ -59,7 +59,7 @@ try:
 except:
     api.create_repo(repo_id=repo, repo_type='dataset', private=True)
     print(f'[entrypoint] Created dataset: {repo}', flush=True)
-" 2>&1 | tee -a "$LOGFILE" >&2 || log "[entrypoint] WARNING: Could not verify dataset"
+" 2>&1 || echo "[entrypoint] WARNING: Could not verify dataset" >&2
 else
     log "[entrypoint] WARNING: persistence disabled (no token/repo)"
 fi
@@ -74,12 +74,12 @@ log "[entrypoint] Wrote /etc/huggingrun.env"
 
 # Background: init (download + restore) then start sync-loop
 # This runs AFTER services start so HF doesn't timeout
-# IMPORTANT: do NOT redirect stderr (2>&1) — HF captures stderr for runtime logs
+# NO redirects here — stderr must flow to container stderr for HF log API
 (
-    log "[entrypoint:bg] Starting init in background ..."
-    python3 -u /opt/git_sync_daemon.py init 2>&1 | tee -a "$LOGFILE" >&2
-    log "[entrypoint:bg] Init done, starting sync-loop ..."
-    python3 -u /opt/git_sync_daemon.py sync-loop 2>&1 | tee -a "$LOGFILE" >&2
+    echo "[entrypoint:bg] Starting init in background ..." >&2
+    python3 -u /opt/git_sync_daemon.py init
+    echo "[entrypoint:bg] Init done, starting sync-loop ..." >&2
+    exec python3 -u /opt/git_sync_daemon.py sync-loop
 ) &
 BG_PID=$!
 log "[entrypoint] Background init+sync PID=${BG_PID}"

ubuntu-server/git_sync_daemon.py

@@ -41,9 +41,17 @@ UPLOAD_IGNORE = [
 ]
 
 
+LOGFILE = "/var/log/huggingrun.log"
+
 def log(msg):
     ts = time.strftime("%H:%M:%S", time.gmtime())
-    print(f"[sync {ts}] {msg}", file=sys.stderr, flush=True)
+    line = f"[sync {ts}] {msg}"
+    print(line, file=sys.stderr, flush=True)
+    try:
+        with open(LOGFILE, "a") as f:
+            f.write(line + "\n")
+    except Exception:
+        pass
 
 
 def run(cmd, cwd=None):