fix: use stderr for all logs (HF Spaces captures stderr, not stdout)

HF Spaces log API only captures stderr from Docker containers.
Changed all scripts to redirect stdout→stderr (exec 1>&2) and
Python to print to sys.stderr. Added PYTHONUNBUFFERED=1, removed
stdbuf wrapper.

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

Dockerfile

@@ -52,7 +52,8 @@ COPY scripts /scripts
 RUN chmod +x /scripts/entrypoint.sh /opt/start-server.sh
 
 ENV PERSIST_PATH=/data
-ENV RUN_CMD="stdbuf -oL -eL /opt/start-server.sh"
+ENV PYTHONUNBUFFERED=1
+ENV RUN_CMD="/opt/start-server.sh"
 ENV SSH_PORT=2222
 
 # Run as root (needed for: apt install persistence, bind mounts, sshd)

scripts/entrypoint.sh

@@ -6,8 +6,8 @@
 # 3. Start sync-loop daemon in BACKGROUND
 # ─────────────────────────────────────────────────────────────────────
 set -e
-# Merge stderr → stdout so HF runtime log API captures ALL output
-exec 2>&1
+# HF Spaces log API captures stderr — redirect ALL stdout → stderr
+exec 1>&2
 echo "========================================"
 echo "[entrypoint] HuggingRun starting ..."
 echo "[entrypoint] Date: $(date -u)"

ubuntu-server/git_sync_daemon.py

@@ -43,7 +43,7 @@ UPLOAD_IGNORE = [
 
 def log(msg):
     ts = time.strftime("%H:%M:%S", time.gmtime())
-    print(f"[sync {ts}] {msg}", flush=True)
+    print(f"[sync {ts}] {msg}", file=sys.stderr, flush=True)
 
 
 def run(cmd, cwd=None):
@@ -271,7 +271,7 @@ def cmd_sync_loop():
         except Exception as e:
             log(f"  ✗ Sync cycle #{cycle} error: {e}")
             import traceback
-            traceback.print_exc(file=sys.stdout)
+            traceback.print_exc(file=sys.stderr)
         log(f"  Sleeping {SYNC_INTERVAL}s until next cycle ...")
         time.sleep(SYNC_INTERVAL)
 

ubuntu-server/start-server.sh

@@ -4,8 +4,8 @@
 # Port 7860 (nginx): web terminal + SSH
 # ─────────────────────────────────────────────────────────────────────
 
-# Merge stderr → stdout so HF runtime log API captures ALL output
-exec 2>&1
+# HF Spaces log API captures stderr — redirect ALL stdout → stderr
+exec 1>&2
 
 export SSH_PORT="${SSH_PORT:-2222}"
 export TTYD_PORT="${TTYD_PORT:-7681}"