- use a tempfile

osc/core.py

@@ -2701,15 +2701,24 @@ def get_user_data(apiurl, user, *tags):
 
 
 def get_source_file(apiurl, prj, package, filename, targetfilename=None, revision = None):
+    import tempfile, shutil
     query = None
     if revision:
         query = { 'rev': revision }
-
-    o = open(targetfilename or filename, 'wb')
+    o = None
+    try:
+        (fd, tmpfile) = tempfile.mkstemp(prefix = filename, suffix = '.osc')
+        o = os.fdopen(fd, 'wb')
         u = makeurl(apiurl, ['source', prj, package, pathname2url(filename)], query=query)
         for buf in streamfile(u, http_GET, BUFSIZE):
             o.write(buf)
         o.close()
+        shutil.move(tmpfile, targetfilename or filename)
+    except:
+        if o is not None:
+            o.close()
+        os.unlink(tmpfile)
+        raise
 
 
 def get_binary_file(apiurl, prj, repo, arch,