fix: Run backup/restore on host via nsenter for Python venv compatibility

Matthias Nott

2026-02-21 7300351bb9fb147f4de81a60423c4561a4924c21

 app/routers/restore.py
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@@ -6,7 +6,7 @@
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 from fastapi.responses import StreamingResponse
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 from app.auth import verify_token
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-from app.ops_runner import _BACKUP_TIMEOUT, stream_ops
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+from app.ops_runner import _BACKUP_TIMEOUT, stream_ops_host
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 router = APIRouter()
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@@ -22,18 +22,22 @@
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     source: str,
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     dry_run: bool,
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 ) -> AsyncGenerator[str, None]:
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-    """Async generator that drives the restore workflow and yields SSE events."""
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+    """Async generator that drives the restore workflow and yields SSE events.
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+
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+    Runs on the host via nsenter because ops restore delegates to project CLIs
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+    that use host Python venvs incompatible with the container's Python.
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+    """
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     base_args = ["restore", project, env]
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     if dry_run:
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         base_args.append("--dry-run")
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     if source == "offsite":
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-        # ops offsite restore <project> <env> — downloads from offsite storage
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+        # ops offsite restore <project> <env>
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         download_args = ["offsite", "restore", project, env]
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         yield _sse_line({"line": f"Downloading {project}/{env} from offsite...", "timestamp": _now()})
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         download_ok = True
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-        async for line in stream_ops(download_args, timeout=_BACKUP_TIMEOUT):
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+        async for line in stream_ops_host(download_args, timeout=_BACKUP_TIMEOUT):
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             yield _sse_line({"line": line, "timestamp": _now()})
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             if line.startswith("[error]"):
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                 download_ok = False
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@@ -45,7 +49,7 @@
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         yield _sse_line({"line": "Download complete. Starting restore...", "timestamp": _now()})
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     success = True
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-    async for line in stream_ops(base_args, timeout=_BACKUP_TIMEOUT):
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+    async for line in stream_ops_host(base_args, timeout=_BACKUP_TIMEOUT):
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         yield _sse_line({"line": line, "timestamp": _now()})
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         if line.startswith("[error]"):
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             success = False
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@@ -69,7 +73,7 @@
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     Restore a backup for the given project/env.
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     Uses Server-Sent Events (SSE) to stream real-time progress.
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-    Parameters are passed as query strings since EventSource only supports GET.
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+    Runs on the host via nsenter for Python venv compatibility.
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     """
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     return StreamingResponse(
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         _restore_generator(project, env, source, dry_run),