download: don't write a lock file if not necessary

this is needed on read-only filesystems
centreborelli · Jan 19, 2024 · c68fa34 · c68fa34
1 parent de59345
commit c68fa34
Showing 1 changed file with 4 additions and 3 deletions.
diff --git a/srtm4/download.py b/srtm4/download.py
@@ -96,9 +96,10 @@ def get_srtm_tile(srtm_tile, out_dir):
         # the tif file is either being written or finished writing
         # locking will ensure it is not being written.
         # Also by construction we won't write on something complete.
-        lock_tif = filelock.FileLock(srtm_tif_write_lock)
-        lock_tif.acquire()
-        lock_tif.release()
+        if os.path.exists(srtm_tif_write_lock):
+            lock_tif = filelock.FileLock(srtm_tif_write_lock)
+            lock_tif.acquire()
+            lock_tif.release()
         return
 
     # download the zip file