fix: favor mv instead of perl rename

lib/sphinx/integration/helper_adapters/remote.rb

@@ -108,7 +108,10 @@ def index(online)
           @ssh.within(reindex_host) do
             indexer_args << "--nohup" if online
             @ssh.execute("indexer", *indexer_args, exit_status: [0, 2])
-            @ssh.execute("rename -f 's/\\.tmp\\./\\.new\\./' #{config.searchd_file_path}/*_core.tmp.*") if online
+            if online
+              @ssh.execute("for NAME in #{config.searchd_file_path}/*_core.tmp.*; " +
+                           'do mv -f "${NAME}" "${NAME/\.tmp\./.new.}"; done')
+            end
           end
 
           files = "#{config.searchd_file_path}/*_core#{".new" if online}.*"

spec/sphinx/integration/helper_adapters/remote_spec.rb

@@ -55,7 +55,7 @@
   end
 
   describe "#index" do
-    before { stub_sphinx_conf(config_file: "/path/sphinx.conf") }
+    before { stub_sphinx_conf(config_file: "/path/sphinx.conf", searchd_file_path: "/path/data") }
 
     context "when is online" do
       context "when one host" do
@@ -71,10 +71,11 @@
           expect(ssh).to receive(:within).with("s1.dev").and_yield
           expect(ssh).to receive(:execute).
             with("indexer", "--all", "--config /path/sphinx.conf", "--rotate", "--nohup", exit_status: [0, 2])
+          expect(ssh).to receive(:execute).
+            with('for NAME in /path/data/*_core.tmp.*; do mv -f "${NAME}" "${NAME/\.tmp\./.new.}"; done')
           server = double("server", opts: {port: 22}, user: "sphinx", host: "s1.dev")
           expect(ssh).to receive(:without).with("s1.dev").and_yield(server)
           expect(ssh).to receive(:execute).with("rsync", any_args)
-          expect(ssh).to receive(:execute).with(/^rename/)
           expect(ssh).to receive(:execute).with("kill", /SIGHUP/)
 
           adapter.index(true)