Use nsenter with pid:host to run zpool in host mount namespace

services/zfs.py

@@ -15,16 +15,18 @@ async def get_zfs_pool_map() -> dict[str, str]:
     """
     pool_map = {}
     try:
-        env = os.environ.copy()
-        host_lib = os.environ.get("ZFS_HOST_LIB")
-        if host_lib:
-            env["LD_LIBRARY_PATH"] = host_lib
+        # When running in a container with pid:host, use nsenter to run
+        # zpool in the host mount namespace so it finds its own libs.
+        use_nsenter = os.environ.get("ZFS_USE_NSENTER", "").lower() in ("1", "true")
+        if use_nsenter:
+            cmd = ["nsenter", "-t", "1", "-m", "--", "zpool", "status", "-P"]
+        else:
+            cmd = [ZPOOL_BIN, "status", "-P"]
 
         proc = await asyncio.create_subprocess_exec(
-            ZPOOL_BIN, "status", "-P",
+            *cmd,
             stdout=asyncio.subprocess.PIPE,
             stderr=asyncio.subprocess.PIPE,
-            env=env,
         )
         stdout, _ = await proc.communicate()
         if proc.returncode != 0: